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HVAC Companies in Bristol: 400+ Active Firms (2026)
HVAC companies in Bristol install, maintain and service heating, ventilation, air-conditioning and refrigeration systems across the city region.
Facilities managers, estate teams and property owners sit at the centre of Bristol’s HVAC buying, with commercial property, industrial sites, hospitality, retail and public-sector estates all represented. The most relevant suppliers are not just installers; they combine field-engineer capacity, planned preventative maintenance, emergency repair cover, compliance inspection and project delivery. Engagements tend to be contract-led, with recurring service visits sitting alongside plant replacement, ventilation upgrades and refrigeration work. Buyers usually value local response coverage, engineer scheduling discipline and the ability to handle occupied buildings without disrupting operations.
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Bristol has 425 actively trading HVAC companies, making the local market sizeable enough for researchers to distinguish between small trade contractors, maintenance-led operators and firms set up for larger project work. Together, the cohort accounts for a reported headcount of 976, so the employment footprint is visible but still dispersed across many businesses. That pattern fits a service market where local call-out reach, engineer availability and account management matter, while only a narrower subset is likely to suit commercial and industrial estates needing planned maintenance across several sites.
Gas work, refrigerant handling and ventilation compliance shape customer requirements beyond basic installation. Facilities-management and public-sector buyers tend to ask for evidence of competent engineers, safe working procedures, maintenance logs and call-out cover before awarding recurring contracts. Commercial customers also have practical incentives to replace older plant: energy-efficiency upgrades can reduce running costs, while better maintenance reduces downtime in retail, hospitality and industrial premises. The market structure therefore favours contractors that can document their work as well as perform it, particularly where equipment sits inside occupied buildings or critical operating spaces.
Bristol’s HVAC base appears likely to remain contractor-led, with demand shaped by building maintenance cycles, plant replacement and the steady outsourcing of facilities work. The scarcity of larger operators means acquisition interest may centre on firms with recurring service contracts, field-engineer density and access to commercial estates rather than general domestic installation. Margin pressure tends to sit in labour scheduling, parts availability and emergency response, while customers are likely to scrutinise compliance evidence more closely. Firms that can combine planned maintenance with retrofit and refrigeration capability should be better placed than narrow installation-only operators.
425
Active firms
2026
10
Above £5M
Reported revenue
88
Since 2022
Recent incorporations
Key facts
About 2% of the trading cohort reports turnover above £5M (10 of 425 firms) — the rest sits below that revenue band.
20% of the cohort was incorporated since 2022 (88 firms), so a sizeable share is in its first few filing cycles.
Bristol HVAC and refrigeration work covers heating, ventilation, air-conditioning and refrigeration systems across the city region.
Revenue in this segment tends to follow installation work, planned maintenance and reactive call-outs rather than a single product cycle.
Buyer screening often needs to separate local maintenance specialists from contractors with broader installation and servicing capacity.
Direct-labour contractors, subcontract-led service businesses and larger mechanical-services operators all appear in the Bristol market.
Top Bristol HVAC companies
GREY MAN ENGINEERING LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides commercial building engineering services including installation, maintenance and repair of gas, heating and hot water systems, plumbing and pipework, air conditioning, ventilation and air…
Serves organisations managing occupied commercial buildings, including schools and universities, nursing and residential care homes, hospitality operators and commercial property owners or facilities…
Financial Health
StrongStrong · Hiring · 19% CAGR over 6y
Location
Unitary Engineering Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides commercial facilities management and building engineering services including HVAC installation and maintenance, electrical and plumbing works, property maintenance, office and washroom…
Serves businesses and public-sector organisations managing commercial buildings across Bristol, Cardiff and the Southwest, including schools, transport depots and multi-site operators.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
BS3 Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation, commissioning and maintenance of mechanical and electrical building services, including HVAC, power and related systems, and manages engineering projects through…
Serves organisations with major building projects, including cultural institutions, education and technology facilities, hospitality venues, and other commercial or public-sector clients across…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
Lipari FM Ltd
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides facilities management services including plumbing and heating, air conditioning, electrical systems, equipment installation, maintenance, repairs, emergency callouts, and compliance testing…
Serves businesses and consumers across the UK, including commercial and domestic customers in education, healthcare, leisure and hospitality, transport, logistics and warehousing, retail, and…
Financial Health
StrongStrong
Location
NL Services (Sw) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, refurbishment and maintenance of domestic, commercial and industrial heating and hot water systems. Also offers ventilation, air conditioning, heat pumps, LPG and natural gas…
Serves homeowners and domestic customers, commercial and industrial premises, schools and public-sector clients in Bristol, including office blocks, plant rooms and commercial catering facilities.
Financial Health
StrongStrong · Growing, Hiring · 46% CAGR over 4y
Location
CPL Property Maintenance Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides property maintenance services for commercial properties, including heating and ventilation systems, air conditioning, electrical work, commercial plumbing, general building maintenance, and…
Serves UK businesses and property managers responsible for commercial sites, including retail, logistics, healthcare, commercial real estate, transportation and manufacturing organisations.
Financial Health
WeakWeak · 0% CAGR over 3y
Location
KEYPLAN SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services including design, installation and commissioning of heating, chilled water, plumbing, ventilation, air conditioning, electrical and renewable…
Sells to businesses in the construction and building sectors, especially main contractors and project teams delivering commercial, leisure, care and medical developments requiring MEP services.
Financial Health
WeakWeak
Location
The Bristol Fan Company Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, supplies and installs HVAC systems including dust and fume extraction, ventilation and air conditioning equipment. Provides LEV testing, system servicing and maintenance, and supplies…
Serves business customers in the HVAC market across the South West, including facilities and operations teams needing dust extraction, fume extraction, ventilation, air conditioning, LEV testing, and…
Financial Health
HealthyHealthy · 4% CAGR over 2y
Location
MJD Mechanical & Electrical Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services including system design, installation and maintenance. Also installs renewable energy systems. Works on building projects across sectors such…
Sells to commercial, industrial and residential customers, including organisations in healthcare, education, retail, hospitality, sport and leisure, plus special-purpose projects. Targets property…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
LDM Building Services Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical building services including design, planning, installation and maintenance of ventilation, heating, air conditioning and pipework systems. Delivers engineering support and project…
Serves commercial clients across sectors managing building projects of all sizes, alongside domestic customers needing mechanical building services support.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 5y
Location
COLD TECH (SERVICES) LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides sales, hire, installation, servicing and maintenance of commercial refrigerated cabinets, coldstores, refrigeration and air conditioning systems. Also offers refurbishment, spare parts,…
Serves B2B customers in food retail, wholesale, distribution and industrial sectors across the UK, particularly organisations operating commercial refrigerated cabinets, coldstores and food supply…
Financial Health
HealthyHealthy · -89% CAGR over 2y
Location
Leader Air Conditioning Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, supply, installation, and maintenance of air conditioning systems for commercial, retail, industrial, and domestic properties. Services and repairs equipment and installs systems…
Serves commercial, retail, industrial and domestic customers across the UK, including shops, offices, schools and colleges, hospitals, health centres, restaurants, hotels, IT rooms and homeowners.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Combined Gas Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation and maintenance of commercial gas and mechanical systems for industrial and commercial buildings, including plant installations, pipe welding, and plumbing and heating works for…
Serves B2B and public sector customers in industrial and commercial premises, including office blocks, apartment developments, schools, military barracks and other commercial property operators.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
KEYPLAN ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services including design, installation and commissioning of heating, plumbing, ventilation, air conditioning, electrical and renewable energy systems,…
Targets B2B construction buyers, including main contractors, developers and project directors, on commercial construction and refurbishment projects; project examples emphasise education, healthcare,…
Financial Health
WeakWeak · -2% CAGR over 4y
Location
TDK Mechanical Services (UK) Ltd
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides mechanical and electrical building services including design, installation, testing and maintenance for commercial and residential projects. Also delivers commercial fit‑outs, HVAC and…
Sells to businesses, organisations and public sector bodies needing M&E, fit-out, maintenance or fire protection services, especially in commercial, industrial, education, institutional and…
Financial Health
DistressedDistressed
Location
PLUMBTEC (SOUTH WEST) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical heating and plumbing contracting services, including installation, maintenance and support for commercial and domestic systems. Works with architects, property developers and…
Serves architects, property developers and building contractors on commercial projects, alongside domestic customers in Bristol, Bath, North Somerset and Gloucestershire.
Financial Health
StrongStrong · -3% CAGR over 4y
Location
Sugoi Solutions Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation and maintenance of air conditioning, ventilation and HVAC systems for domestic and commercial properties. Services include heat pump installation, heat recovery…
Serves a mix of B2B and B2C customers, including homeowners, commercial premises, industrial sites and organisations needing building-services contractors for domestic, commercial or industrial…
Financial Health
StableStable · 3% CAGR over 2y
Location
MAINTENANCE & CONTRACTING SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical contracting and building services for commercial projects, including system design, installation and commissioning. Works on HVAC, plumbing, ventilation, power,…
Serves businesses and project clients across the UK in commercial, corporate, hospitality and industrial sectors, including offices, retail centres, hotels, resorts, factories, warehouses and…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 36% CAGR over 2y
Location
Pace Plumbing and Heating Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
DRH Plumbing & Heating Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Dowling Heating Building Services Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
A & F HEATING AND PLUMBING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -16% CAGR over 4y
Location
AQUATONICS (UK) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical engineering and pipework installation services for building systems, including gas systems, wet heating and water pipework, and modular plantrooms. Carries out mechanical…
Sells to main contractors, property managers, facilities operators and engineering teams on commercial building projects across the South of England and South Wales.
Financial Health
HealthyHealthy · -5% CAGR over 2y
Location
Cool Solutions Refrigeration And Air Conditioning Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · Hiring · 18% CAGR over 2y
Location
Simon Baker Bathrooms Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
MATTHEW LANE LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
C F Plumbing & Heating Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
BWB Heating Installations Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
Jewell Plumbing & Property Maintenance Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
ACE GAS Bristol Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
DJH PLUMBING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · -90% CAGR over 2y
Location
HYDRA BUILD LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
Home Assist 365 Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -6% CAGR over 4y
Location
NB PLUMBING & HEATING BRISTOL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
IAN HOBBS TECHNICAL SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation, repair and maintenance of commercial refrigeration, air conditioning, electrical, ventilation and renewable energy systems. Also supplies and hires refrigeration…
Serves businesses and homeowners in South West England, especially commercial premises needing refrigeration, air conditioning, electrical, ventilation and renewables support.
Financial Health
StableStable · -67% CAGR over 4y
Location
COOLSTREAM (UK) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides air conditioning services including system design, supply, installation, repair and maintenance for residential and commercial properties. Also installs refrigeration, ventilation, heat…
Serves homeowners and businesses in Bristol and the South West, including offices, retailers, schools and colleges, restaurants, hotels, healthcare/NHS sites, IT rooms and warehouses.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
AMBIENT ENGINEERING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, installs and services air conditioning, refrigeration, and ventilation systems for commercial and industrial premises. Provides planned maintenance and fresh air systems for sectors…
Serves B2B customers, including offices, commercial and industrial premises, retailers, leisure venues and medical-sector organisations, mainly around Bath, Bristol and surrounding areas with…
Financial Health
WeakWeak · -18% CAGR over 2y
Location
Envira-Mech Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 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 · -2% CAGR over 2y
Location
I and M Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides plumbing and heating design and installation services, including pipework, commercial boilers and heating plant. Works on residential, commercial and industrial buildings, and offers…
Serves main contractors and property owners/managers across Bristol, Bath, the South West and M4/M5 corridor, including commercial offices, industrial sites, local authorities, schools, universities,…
Financial Health
DistressedDistressed · -27% CAGR over 2y
Location
Chilled Heat Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides installation, maintenance and repair of air conditioning systems, commercial refrigeration and electric and gas catering equipment. Supplies and installs replacement kitchen and cooling…
Serves businesses and public-sector sites, including hotels, restaurants, schools, offices and MOD facilities across the South West, South Wales and nearby counties.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
MANNINGS FACILITIES MANAGEMENT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical contracting services including installation, servicing and maintenance of heating, air conditioning, ventilation and control systems. Also offers electrical…
Serves commercial property owners, facilities managers, main contractors and organisations across Bristol, Wales and the South West requiring mechanical and electrical installation, servicing and…
Financial Health
WeakWeak · -68% CAGR over 4y
Location
J. P. SERVICES (SOUTH WEST) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and plumbing services including heating, ventilation and air conditioning installation, pipe welding, and medical gas system installation and maintenance for commercial and…
Serves private and commercial sector clients in Bristol, South West England and Wales requiring mechanical, plumbing, HVAC, pipe-welding and medical gas services.
Financial Health
WeakWeak · -1% CAGR over 4y
Location
Apex Air Conditioning Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and maintains air conditioning, cooling, heating and ventilation systems for commercial, industrial and domestic buildings. Provides data centre cooling solutions, chiller…
Serves commercial, industrial and domestic customers, including businesses with offices, server rooms or data centres, plus homeowners; also works with consultants and client-side project teams.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Taranis Air Conditioning Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation, commissioning, and maintenance of HVAC and environmental control systems. Specialises in heat pump systems and offers project management, in‑house design, servicing,…
Serves business customers, main contractors and facilities management teams responsible for commercial buildings and environmental control projects, including organisations procuring HVAC and…
Financial Health
StableStable
Location
Elite-Mech Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating installation, maintenance and repair services, particularly for healthcare facilities. Also installs and services air conditioning, ventilation and medical gas systems,…
Serves NHS hospital trusts, hospital estates teams and healthcare-sector contractors working in clinical environments, with emphasis on public-sector hospital sites.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
Coldstar (UK) Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides installation, maintenance and repair of commercial refrigeration, air conditioning and HVAC systems. Also supplies and services commercial catering equipment and offers mobile cold room hire…
Serves business customers in commercial, industrial and retail sectors, including shops, restaurants and other retail outlets, with nationwide coverage.
Financial Health
HealthyHealthy · -5% CAGR over 2y
Location
CHILLER TECHNICAL SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation, servicing and maintenance of air conditioning, refrigeration and HVAC systems. Works with equipment including industrial water chillers and split systems, and supports…
Serves businesses and organisations of all sizes with air conditioning, refrigeration and HVAC needs, including industrial sites using water chillers and clients requiring split-system installations.
Financial Health
DistressedDistressed · -68% CAGR over 4y
Location
INVEK SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs mechanical building services for commercial and industrial buildings, including air conditioning systems, heating and chilled water pipework, ventilation and ductwork, air…
Sells to commercial and industrial clients, including main contractors, consultants and end users needing building services installations. Serves organisations across the South East and South West,…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
PSMG Maintenance Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property maintenance and building compliance services, including HVAC commissioning and validation, inspection and certification for regulatory compliance, validation of healthcare…
Serves B2B and public sector building operators, especially healthcare facilities needing critical ventilation validation, plus owners and facilities teams responsible for HVAC commissioning, legal…
Financial Health
StableStable
Location
Intoheat (Holdings) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical building services engineering, including design, installation and maintenance of HVAC and related systems. Delivers facilities management, energy and…
Serves UK retail brands, commercial property owners and facilities management teams, including supermarket and store operators with multi-site estates and major project needs.
Financial Health
StrongStrong · Hiring · 11% CAGR over 2y
Location
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How Bristol HVAC companies work and how to sell to them
What they do
Most Bristol HVAC firms earn revenue from a blend of recurring maintenance contracts and one-off project work. Planned service agreements usually cover scheduled visits, breakdown response and compliance paperwork, priced per site, per asset or by a fixed monthly fee. Project income comes from plant replacement, fit-out support, ventilation changes, refrigeration installation and remedial works after inspection. Larger commercial operators tend to quote against specifications and method statements, while smaller contractors may price time, materials and parts. Margins depend less on hardware resale than on engineer utilisation, call-out coverage and the ability to keep occupied premises running while work is carried out.
Who they sell to
Typical buyers are facilities managers, estates directors, property managers, operations heads and procurement teams at commercial landlords, industrial occupiers, schools, councils, hotels, retailers and outsourced facilities-management providers. Domestic work may exist at the edge of the market, but the better fit for commercial sales is usually the contract-led commercial operator. Smaller jobs can be won through direct enquiry and quotation; multi-site maintenance, public-sector estates and fit-out packages more often involve approved supplier lists, framework routes or formal tenders. Sales cycles tend to run from a few weeks for remedial work to several months where budgets, access windows and compliance documents need sign-off.
What they buy
HVAC firms tend to spend on tools that improve engineer scheduling, asset histories, job costing, stock control and customer communications. Field-service management, mobile timesheets, quote-to-invoice workflows, accounting, payroll, vehicle tracking, health-and-safety documentation and training management are common back-office needs. Operators handling larger estates may also buy bid support, energy-audit services, CAD and building-services design capacity, compliance advice, recruitment support and subcontractor management. Hardware and infrastructure spend is practical: vans, test equipment, refrigerant handling kit, parts inventory, warehouse space, phones and rugged mobile devices. Marketing spend is usually local and account-led, with search visibility, case materials and referral relationships carrying more weight than broad brand campaigns.
Why and how to sell to them
Buying intent often appears when an HVAC contractor adds engineers, wins a new maintenance portfolio, takes on refrigeration or ventilation compliance work, or moves from ad hoc jobs into recurring contracts. Other triggers include a new operations manager, a warehouse move, rising call-out volumes, missed first-time-fix targets, audit failures or pressure to evidence energy savings for customers. Sellers should lead with operational loss rather than generic growth claims: wasted engineer hours, slow invoicing, poor parts visibility, tender admin and compliance risk. Messages that connect to response times, margin leakage and proof of work usually land better than abstract productivity language, particularly with owner-managed firms.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. 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.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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