HVAC Companies Using Site Kit in the UK: 133 Active Firms (2026)
HVAC companies running website measurement tooling install, service and maintain heating, ventilation and refrigeration systems across the UK.
For HVAC and refrigeration contractors, the measurement plug-in joins website traffic reporting, search visibility and basic performance diagnostics inside the content-management stack. Adoption tends to signal a contractor with a maintained website, internal or agency support for search visibility, and a sales process that values traceable enquiries rather than relying only on frameworks and referrals. In this sector, the tooling is usually a modest layer in a broader digital stack: contact forms, service pages, call tracking and maintenance-plan content aimed at facilities managers, estates teams and commercial landlords.
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The UK adoption cohort contains 133 actively trading HVAC and refrigeration contractors running the measurement plug-in. Reported headcount totals 1,842, which points to an adoption base that includes many small contractors as well as a narrower mid-market layer. Within detected analytics tooling for the wider HVAC sector, the plug-in sits second, with 10.4% adoption, behind the most common general analytics package at 91.8% on a denominator of 1,274. Regional distribution is not London-centred: North West accounts for 15.8%, South East 12.0%, South West 11.3%, London 10.5%, and Yorkshire and The Humber 10.5%.
Procurement and compliance pressures shape how the tooling is used more than the software itself. HVAC contractors often handle quotations, site surveys, emergency call-outs and maintenance records through web forms or telephone-led workflows, so measurement tags need to be governed alongside consent notices, enquiry-routing and retention policies. The vendor ecosystem also matters: the plug-in is typically maintained through website agencies or in-house marketing generalists rather than specialist analytics teams, making configuration discipline uneven across contractors with similar commercial footprints.
Adoption appears tied to wider website maintenance rather than a standalone analytics buying cycle. Contractors with service contracts, planned-maintenance propositions and regional branch networks tend to have clearer reasons to measure search traffic and enquiry quality; smaller operators may keep the tool in place without much active optimisation. The next phase is likely to be shaped by bundled website platforms, cookie-consent defaults and pressure to prove the source of commercial leads. Consolidation among digital agencies serving trades businesses may also standardise configurations, though uneven implementation is likely to persist.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Active director count is the full Companies House board, so it can be higher than the number of names listed — we leave out nominee and formation-agent directors, who aren’t worth contacting. It’s blank for the small number of companies whose officers we haven’t fetched yet.
You’re charged per business, not per row. Where a business trades through several registered companies you get every one, and the Group Primary column marks one row per business — filter to those and the count matches your invoice. Rows sharing a website are not automatically one business: franchises and multi-site operators each count separately, and where names don’t prove a relationship we count them apart rather than guess.
Adoption by company size
Adoption of Site Kit rises with company size across the trading UK HVAC companies in this cohort. 0.4% of the 23,256 companies with under 10 employees run Site Kit (88 detected). 3.8% of the 1,144 companies with 10–50 employees run Site Kit (43 detected). 2.4% of the 83 companies with over 50 employees run Site Kit (2 detected). That is a 2% gap between the over 50 employees and under 10 employees bands.
133
Active firms
2026
10.4%
Of detected Analytics share
UK HVAC
6
Median headcount
Filed accounts
281
Verified directors
Across this cohort
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Key facts
About 9% of the trading cohort reports turnover above £5M (12 of 133 firms) — the rest sits below that revenue band.
5% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Within HVAC analytics installations, the page system has a detected share of 10.4% (133) across a denominator of 1,274 companies with a detectable system; the largest competing analytics system accounts for 91.8% (1,170).
Every firm in the cohort also runs a content-management platform, at 100.0% (133), while 82.7% (110) also run another analytics tag.
SEO and lead-capture components are common in the stack: 60.2% (80) also run an SEO plugin and 51.9% (69) also run a challenge-response form control.
The North West is the largest registered-region cluster at 15.8% (21), ahead of the South East at 12.0% (16) and the South West at 11.3% (15).
All 133 firms carry Field Services & Trades tags, with overlap into Construction at 39.1% (52) and Renewable Energy at 18.8% (25).
WordPress plugins market share among UK HVAC
Share of the 1,274 UK HVAC with a detectable system. As of June 2026.
What else do Site Kit-running HVAC run?
Share of the 133 Site Kit-running UK companies where each technology was also detected. As of June 2026.
Where Site Kit HVAC are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£829.8K
Median UK turnover
9%
Above £5M turnover
7
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 205 businesses, alongside financials and websites, in one Excel + CSV file.
Top UK HVAC using Site Kit
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains commercial refrigeration, air conditioning and mechanical ventilation systems. Provides engineering services, servicing and maintenance for facilities including food…
Serves businesses and public-sector organisations nationwide, including food and drink manufacturers, construction sites, schools, hospitals and power stations.
Financial Health
StableStable · -66% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides commercial air conditioning and refrigeration services including system design, supply and installation of HVAC systems, chillers and cold rooms, along with repair and planned maintenance…
Serves commercial and industrial organisations across the UK and Ireland, including facilities managers, contractors, warehouses, logistics operations and businesses needing compliant air…
Financial Health
HealthyHealthy · -5% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides design, installation, commissioning, maintenance and repair of HVAC systems including ventilation, air conditioning and refrigeration for commercial, industrial and offshore sectors. Also…
Serves B2B customers in commercial and industrial premises, including oil and gas providers, offshore wind operators and transfer boat owners, plus large domestic property owners.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, supplies and installs heating, ventilation and air conditioning (HVAC) systems. Provides mechanical and electrical engineering services including maintenance, natural gas systems,…
Serves commercial, industrial and public-sector organisations nationwide, including aviation, defence/MOD, hazardous area, nuclear, pharmaceutical, retail, shipyard, mine and quarry plant operators.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsDesigns, installs and maintains commercial and industrial HVAC systems, including heating, air conditioning and ventilation. Provides warm air heaters, radiant and boiler systems, air source heat…
Sells to commercial and industrial organisations needing HVAC systems, including offices, factories, hospitals, distribution centres, warehouses, workshops, schools and sports venues, with UK-wide…
Financial Health
HealthyHealthy · 4% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, supplies, installs, and maintains industrial and commercial refrigeration and cooling systems. Provides blast freezers, spiral and tunnel freezers, water chillers, coldrooms,…
Serves B2B customers in the food, manufacturing and commercial sectors, including industrial sites and facilities teams requiring cooling infrastructure, maintenance support and energy-efficient…
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsSupplies, hires and installs industrial chillers, process cooling systems and commercial air conditioning equipment. Provides system design, maintenance contracts, servicing, and 24/7 repair support…
Serves commercial and industrial organisations across the UK, including manufacturers, plastic injection moulders, automotive and aerospace firms, chemical/oil and gas sites, warehouses, breweries,…
Financial Health
StableStable · -78% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides design, installation, repair and planned maintenance of air conditioning and HVAC systems for commercial and residential clients. Also conducts TM44 air conditioning energy inspections and…
Serves corporate, commercial and residential clients, including facilities management companies, retail chains and banks, mainly across Liverpool, Preston, Manchester and the wider North West.
Financial Health
StableStable · -68% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides HVAC system design, installation, servicing and maintenance for commercial and industrial buildings. Specialises in large chiller plant installation and replacement, energy management…
Serves B2B industrial and commercial building operators, construction and facilities maintenance teams, including data centres, across England and Wales with complex HVAC and energy management needs.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsDesigns and installs commercial air conditioning, ventilation and mechanical building services systems. Provides mechanical and electrical turnkey projects, energy‑efficient HVAC solutions, system…
Serves B2B clients including building companies, architects, consultants and commercial end users, with projects for offices, business parks, heritage buildings, rail-related sites and multi-site…
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains commercial and industrial air conditioning, ventilation and chilled water systems. Provides HVAC surveys, refurbishment and retrofit of refrigeration equipment, and…
Serves businesses and organisations with commercial and industrial premises, including offices, computer suites and sites with critical HVAC or process cooling equipment.
Financial Health
WeakWeak · -67% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical and electrical building services including HVAC installation and maintenance, commercial heat pumps, solar PV, electrical systems, and packaged plant rooms. Delivers design,…
Serves B2B and public-sector clients across the North West and UK, including property developers, universities, central government departments, schools, facilities managers, contractors, and large…
Financial Health
DistressedDistressed
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial and industrial mechanical engineering services including design, installation and maintenance of HVAC, heating, chilled water, gas, steam and domestic water systems. Also offers…
Serves procurement and estates managers at hospitals, emergency services, public institutions, industrial sites and commercial enterprises with large-scale or critical building facilities across East…
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides commercial mechanical and electrical engineering services, including installation and maintenance of HVAC systems, boilers, chillers, pumps, lighting and LV power. Also carries out pipe…
Serves commercial property owners, facilities managers, NHS/public-sector estates, hotels, retail/office developments and blue-chip project teams across London and the South East.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides design, installation, commissioning, servicing and maintenance of commercial and industrial heating and combustion systems, including system upgrades, refurbishments and 24/7 breakdown…
Serves businesses and public sector organisations with commercial heating needs, including local authorities, NHS, MoD, schools, nursing homes, hotels, housing associations, hospitals, laboratories,…
Financial Health
WeakWeak · -4% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsDesigns, installs and maintains mechanical building services for commercial and industrial facilities, including heating, air conditioning, plumbing, drainage and catering systems. Provides project…
Targets businesses, facilities managers, property owners and project teams responsible for commercial or industrial buildings, with maintenance customers especially in the Yorkshire region.
Financial Health
StableStable · -91% CAGR over 2y
Location
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Financial sub-scores
Computed from 2 filingsDesigns and installs air conditioning and HVAC systems, including VRV/VRF, split, and close control systems. Provides HVAC design and build services, system upgrades, and ongoing servicing and…
Serves commercial clients, contractors and facilities teams across sectors such as retail, logistics, hospitality and offices, as well as residential customers needing air conditioning support in the…
Financial Health
HealthyHealthy · Hiring · 27% CAGR over 1y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains refrigeration and air conditioning systems for commercial and industrial clients. Services include cold stores, commercial freezers, milk cooling tanks, CO2…
Serves commercial, industrial and some domestic customers, including offices, warehouses, cold store operators, dairy farmers and homeowners needing refrigeration, air conditioning or ventilation…
Financial Health
StableStable · Hiring · 12% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides heating, ventilation and air conditioning (HVAC) services including installation, maintenance and repair of air conditioning systems, heat pumps and ventilation equipment. Also installs…
Serves residential, commercial and industrial customers nationwide, including homeowners, property developers, apartment schemes, offices and commercial premises needing climate control and…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides design, installation, repair and maintenance of commercial refrigeration and air conditioning systems. Supplies refrigerated cabinets, freezers, coldrooms, ice makers and catering equipment,…
Serves retail, leisure, catering and food businesses, including butchers and poultry processors, as well as commercial, domestic and marine customers across Norfolk, Suffolk, Cambridgeshire and Essex.
Financial Health
StableStable · 3% CAGR over 3y
Location
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Computed from 5 filingsDesigns, installs and maintains air conditioning, heating and ventilation systems for commercial and residential buildings. Provides CAD-based HVAC design, project management, equipment installation,…
Serves UK commercial property owners, retailers, showrooms and major brands, alongside high-end residential clients in luxury homes.
Financial Health
WeakWeak · -64% CAGR over 5y
Location
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Computed from 3 filingsProvides installation, servicing and repair of commercial and industrial heating systems including boilers and warm air heaters. Also installs and maintains air conditioning, ventilation and heat…
Serves B2B customers managing industrial and commercial premises in Kent and the South East, including facilities teams, site managers and contract customers needing planned maintenance and emergency…
Financial Health
WeakWeak · -12% CAGR over 2y
Location
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Computed from 5 filingsProvides mechanical and electrical engineering services for commercial buildings, including installation and maintenance of HVAC and air conditioning systems, electrical power and lighting, pipework…
Serves commercial and public sector property owners, facilities managers and main contractors needing M&E, HVAC and building services, including blue-chip projects and bespoke fit-outs, mainly across…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 4 filingsDesigns, installs, refurbishes and maintains mechanical and electrical building services systems, including air conditioning, commercial refrigeration and renewable energy technologies, for…
Serves local authorities and private-sector clients commissioning large-scale building projects, including commercial, industrial and residential developments, housing schemes, education facilities,…
Financial Health
StrongStrong · Growing, Hiring · 38% CAGR over 3y
Location
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- LDM Building Services12648406
Financial sub-scores
Computed from 5 filingsProvides mechanical building services including design, installation, commissioning and maintenance of ventilation, heating, air conditioning and pipework systems. Delivers engineering support and…
Serves commercial clients across all sectors, including businesses and project teams managing small to large-scale building projects, with some services for domestic customers and homeowners.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
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Computed from 2 filingsProvides mechanical and electrical building services for commercial and public sector properties, including installation, maintenance, compliance, breakdown repairs, plant replacement, and renewable…
Serves blue-chip companies, local authorities and commercial property operators across London and the Home Counties, including offices, housing providers, health and medical facilities, education…
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides mechanical building services for commercial and industrial projects, including design and installation of heating, cooling, ventilation and air conditioning (HVAC) systems, plumbing,…
Serves commercial and industrial sector clients, including businesses and project teams delivering building projects across the East Midlands and wider UK, typically on mid- to large-scale projects.
Financial Health
StableStable · -63% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides installation, maintenance, repair, removal and WEEE-compliant disposal of commercial refrigeration display equipment. Also supplies spare parts, refrigerated cabinet and trailer hire, and…
Serves UK businesses using commercial refrigeration display equipment, particularly food retailers and organisations needing chiller or freezer capacity, cabinet maintenance, spare parts, and…
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical, electrical and air conditioning building services, including design, supply, installation, testing, commissioning and maintenance. Also delivers commercial refurbishment,…
Sells to domestic customers and public and private sector organisations, particularly offices, retailers, schools and clients in commercial and industrial markets needing building, mechanical,…
Financial Health
HealthyHealthy · Hiring · 17% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains building mechanical systems for commercial, automotive and industrial facilities, including heating, ventilation, air conditioning, compressed air, vehicle exhaust…
Serves B2B customers in the commercial, accommodation, automotive and industrial sectors, including organisations managing buildings, facilities, plant or specialist mechanical infrastructure.
Financial Health
HealthyHealthy · -10% CAGR over 4y
Location
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Computed from 4 filingsDesigns, installs and maintains commercial air conditioning and close-control cooling systems. Provides data centre cooling design and build, mains power upgrades, R22 refrigerant replacement, and…
Serves businesses with commercial buildings, data centres and other critical environments, including IT service providers and organisations needing planned maintenance, power upgrades or compliant…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 3y
Location
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Computed from 4 filingsProvides commercial air conditioning, heating, cooling and ventilation system design and installation, along with mechanical and electrical engineering services. Also carries out office and building…
Serves businesses and organisations across the UK, including commercial offices, education, healthcare, industrial, leisure and hospitality sites, plus selected residential clients.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 3y
Location
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Computed from 5 filingsProvides HVAC maintenance and engineering services for residential and commercial properties, including planned preventative maintenance, heating and mechanical services, commercial boiler servicing,…
Serves commercial and residential property customers within the M25 region, including facilities managers, residential property managers, managing and letting agents, schools, religious…
Financial Health
HealthyHealthy · -7% CAGR over 4y
Location
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Computed from 5 filingsDesigns, installs and services energy and climate control systems for commercial and residential properties, including air conditioning, refrigeration, heat pumps, solar PV and battery storage, smart…
Serves businesses needing workplace energy, heating, cooling and refrigeration support, alongside homeowners seeking domestic comfort and energy-efficiency upgrades.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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- CF Roberts03123699
Financial sub-scores
Computed from 5 filingsProvides electrical and mechanical building services including design, installation and maintenance. Services cover power and lighting systems, plumbing and heating, ventilation and air conditioning,…
Serves B2B and public sector clients in construction, including healthcare, education, MOD, MOJ, leisure and commercial sectors, from local maintenance customers to major development project teams.
Financial Health
StableStable · -3% CAGR over 5y
Location
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- F G Alden00331680
Financial sub-scores
Computed from 3 filingsProvides building services engineering including design, installation and maintenance of mechanical, electrical and plumbing systems. Delivers MEP contracting, renewable energy integration, and…
Serves B2B and public-sector clients across pharmaceuticals, commercial property, education, healthcare, hospitality, residential, leisure and student accommodation sectors, typically on larger or…
Financial Health
HealthyHealthy · -18% CAGR over 2y
Location
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Computed from 5 filingsProvides mechanical and electrical building services including design, installation and maintenance of plumbing, drainage, HVAC, gas and electrical systems. Works on commercial and institutional…
Serves commercial and institutional property clients, including retail sites, office buildings, leisure premises, schools, universities, hospitals and health centres, with some services also aimed at…
Financial Health
WeakWeak · -10% CAGR over 4y
Location
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Computed from 5 filingsProvides design, installation and maintenance of building services systems including heating, ventilation and air conditioning (HVAC), hot and cold water services, electrical installations, lighting,…
Serves public sector bodies, schools, colleges, healthcare providers, social housing organisations, and commercial, industrial and manufacturing sites across London and the South East.
Financial Health
StableStable · -66% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical building maintenance and engineering services for commercial properties, including plumbing, heating, drainage repairs, air conditioning, electrical services, water hygiene, fire…
Serves commercial clients, facilities managers and property owners in London and the South East responsible for maintaining business premises and building systems.
Financial Health
DistressedDistressed · -10% CAGR over 4y
Location
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Computed from 3 filingsDesigns, installs and maintains mechanical building services including HVAC and plumbing systems. Delivers mechanical installations and upgrades for office fit-outs, healthcare facilities,…
Serves B2B and institutional clients in regulated, technical environments, including office fit-out firms, healthcare providers, life sciences facilities, and organisations running decarbonisation…
Financial Health
HealthyHealthy · 4% CAGR over 2y
Location
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Computed from 4 filingsProvides refurbishment and replacement of air handling units (AHUs), including bespoke flat‑pack AHUs for sites with restricted access. Carries out fan energy upgrades, cooling tower fan upgrades,…
Serves B2B customers managing commercial or industrial buildings, including facilities teams, building owners and contractors needing air handling unit work where access or bespoke fit requirements…
Financial Health
WeakWeak · Hiring · 5% CAGR over 3y
Location
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Computed from 5 filingsProvides facilities management and building maintenance services for commercial and industrial sites, including planned and reactive maintenance, HVAC support, M&E works, fire and security systems,…
Sells to businesses needing facilities management and engineering support, especially in logistics, distribution, manufacturing, retail, transport, hospitality, leisure, petrochemical and rail.…
Financial Health
StableStable · -69% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical and electrical building services including air conditioning installation and maintenance, gas and heating system servicing, electrical installation, and planned preventative…
Serves B2B building managers and facilities teams across sectors in the South East and Greater London, particularly organisations responsible for commercial building systems and maintenance.
Financial Health
StableStable · -7% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, maintenance and technical support for air conditioning systems, including split, VRF and close‑control computer room cooling. Also installs electrical systems and structured…
Serves businesses and organisations, from blue-chip companies with large user networks to small doctor’s surgeries, particularly commercial premises, data centres and computer rooms.
Financial Health
StableStable · Hiring · 4% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical, electrical and public health engineering services for commercial and industrial buildings, including design, installation and maintenance of HVAC systems, air source heat pumps,…
Serves main contractors and direct clients on commercial and industrial building projects across Kent, including public-sector, heritage and defence-related sites.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides HVAC services focused on air-handling units, including refurbishment, manufacturing, installation, coil repair and replacement, and control upgrades. Conducts ventilation surveys,…
Serves B2B customers managing commercial and industrial buildings, including facilities teams, mechanical contractors and property operators needing air-handling, ventilation, boiler and pipework…
Financial Health
HealthyHealthy
Location
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Computed from 5 filingsDesigns and installs air conditioning and ventilation systems for commercial and industrial clients. Provides consultation, system design, project management, mechanical services, dehumidification…
Sells to businesses and institutions across the UK needing air conditioning and ventilation systems, including corporate facilities teams and organisations in media, sport, utilities, technology,…
Financial Health
StableStable · 0% CAGR over 4y
Location
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- ProActive Commercial Maintenance08272958
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Computed from 5 filingsProvides planned preventative and reactive maintenance for commercial and retail properties, including handyman repairs, HVAC servicing, electrical work, plumbing, PAT testing, emergency lighting…
Serves B2B commercial and retail clients, including single- and multi-site operators with shops, offices and other commercial spaces across the UK and Ireland, plus companies needing subcontracted…
Financial Health
DistressedDistressed · -69% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides building services maintenance for residential and commercial properties, including planned and reactive maintenance of heating, cooling, plant rooms, heat networks and energy centres, with…
Serves property managers, developers and building owners responsible for residential blocks, commercial buildings, plant rooms and heat networks across London and the Home Counties.
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns, installs and maintains building energy management systems (BEMS) and environmental control systems. Provides project delivery, upgrades and planned maintenance for HVAC and building control…
Serves businesses and institutions across the UK that operate large commercial buildings, including exhibition centres, hotel groups, law firms and universities.
Financial Health
StableStable · -62% CAGR over 4y
Location
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151 more companies and their verified directors are in the file
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How Site Kit usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. HVAC companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of HVAC companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Site Kit is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
How many UK HVAC companies use Site Kit?
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