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HVAC Companies in Leicester: 294 Active Firms (2026)
HVAC and refrigeration companies in Leicester install, maintain and repair heating, ventilation, cooling and cold-chain systems across the city region.
Buying centres cluster around facilities management, estates, operations and compliance teams rather than technology or procurement alone. The typical buyer is a local commercial landlord, industrial site, retailer, hospitality operator, healthcare estate, logistics facility or public-sector building owner with recurring service needs and occasional project work. Engagements tend to mix planned preventive maintenance, emergency call-outs, installation upgrades and refrigeration repairs, with risk judged through uptime, energy use, temperature assurance and air-quality obligations. The Leicester fit is therefore less about national plant portfolios and more about contractors able to cover repeat site visits, document compliance and respond within a city-region service radius.
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Leicester has 294 actively trading HVAC and refrigeration companies in this list. The employment footprint is visible rather than merely theoretical: reported headcount totals 804 people, reflecting a labour model built around engineers, service coordinators, refrigeration technicians and project supervisors. Only 12 firms report turnover above £5M, so the local market remains weighted towards smaller contractors and owner-managed operators rather than large national facilities platforms. A further 66 firms were incorporated since 2022, suggesting continuing formation at the smaller end of the trade, where local relationships and response times still matter.
Compliance pressure sits close to day-to-day operations because these firms work on occupied buildings, temperature-controlled stock and mechanically ventilated spaces. Commercial buyers usually expect documented maintenance, engineer competence, risk assessments, safe handling of refrigerants and evidence that plant has been commissioned and serviced to specification. Public-sector and healthcare sites add procurement checks and audit trails, while hospitality, retail and logistics customers tend to focus on downtime, hygiene and cold-chain continuity. For researchers, that means turnover alone can understate capability: accreditation, call-out cover and recurring maintenance books often explain why smaller contractors remain commercially relevant.
Replacement and retrofit work appears likely to matter more than greenfield installation for many Leicester contractors, given the cohort’s service-led profile and the mix of retail, logistics, healthcare and public-estate buyers. Demand tends to follow asset age, tenant churn, energy-cost scrutiny and the need to keep occupied buildings within safe operating conditions. Scale-up scarcity may persist: many operators appear local by design, with growth constrained by engineer availability, call-out geography and the need to maintain response times. Consolidation is plausible where maintenance books are transferable, but relationship-led service work limits how far that can be industrialised.
294
Active firms
2026
12
Above £5M
Revenue threshold
66
Recent incorporations
Since 2022
Key facts
About 4% of the trading cohort reports turnover above £5M (12 of 294 firms) — the rest sits below that revenue band.
22% of the cohort was incorporated since 2022 (66 firms), so a sizeable share is in its first few filing cycles.
HVAC and refrigeration work in Leicester is tied to energy use, compliance, tenant comfort and temperature-controlled operations across commercial and public-sector sites.
The local market appears weighted towards installation, maintenance and repair rather than software-led or asset-light operating models.
Industrial units, public buildings and local operators are likely buyer groups where downtime and service response matter in procurement.
Purchasing decisions are likely to sit with owner-managers, contracts directors and facilities-focused operators rather than centralised procurement teams.
Top Leicester HVAC companies
T S REFRIGERATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and repairs commercial refrigeration equipment for hospitality and retail businesses. Services include chilled and frozen display units, cold rooms, chilled storage, ice…
Serves commercial customers within 40 miles of Leicester, including bars, clubs, restaurants, cafés and food retailers needing refrigeration, chilled display, freezer, cold room, ice machine and air…
Financial Health
StableStable · 0% CAGR over 4y
Location
UNICOOL (LEICESTER) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides industrial refrigeration and process cooling services including system design, equipment supply, installation, hire, maintenance and repair. Also installs and services air conditioning and…
Serves Midlands-based industrial and institutional customers, especially printing and packaging firms, automotive businesses, food and beverage producers, metals and plastics manufacturers, and…
Financial Health
HealthyHealthy · -61% CAGR over 4y
Location
WILLIAM FREER LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides installation, maintenance and repair services for plumbing, heating, gas systems, refrigeration, air conditioning, electrical systems and commercial catering equipment. Also undertakes…
Serves B2B and public-sector customers, especially schools, academies, colleges and universities with campus facilities, catering outlets and commercial buildings requiring ongoing site maintenance…
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 2y
Location
ICE COOL AIR CONDITIONING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and maintains commercial and industrial refrigeration, air conditioning and process cooling systems. Provides cold rooms, chillers, ventilation and cellar cooling, with…
Serves commercial and industrial organisations in the UK and overseas, including pharmaceutical, healthcare, food and drink, manufacturing, plastics, chemical, petrochemical, office, warehouse and…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
P.T.I. Building Services Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides building services engineering and facilities management, including installation, maintenance and servicing of air conditioning, chilled water systems, ventilation, plumbing and electrical…
Serves business and public-sector clients, including food and beverage manufacturers, distribution companies, schools, offices, police stations, ambulance and military sites, plus MEP contractors…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
MCVEIGH TECHNICAL SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains building services systems including air conditioning, ventilation, heating, plumbing and electrical installations. Provides servicing and planned maintenance for…
Serves B2B customers in retail, industrial and commercial sectors across the UK, including building owners, occupiers and facilities teams managing shops, offices, factories and other premises.
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
A.T. Services Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides installation and maintenance of plumbing, heating, gas, ventilation and air conditioning systems for buildings, including mechanical services installation, repairs and ongoing maintenance…
Financial Health
StableStable · Hiring · 20% CAGR over 4y
Location
E.JORDON (REFRIGERATION) LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides shopfitting, interior fit‑out and refurbishment services, alongside installation and maintenance of commercial refrigeration and HVAC systems. Also supplies retail shelving and display…
Serves UK retail chains and independents, hospitality and leisure operators, fuel and service station retailers, and workplace occupiers, engaging business owners, facilities teams and…
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
Location
Ashwell Maintenance Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides commercial heating, plumbing and gas engineering services, including boiler and plant room installations, appliance servicing, gas tightness testing, breakdown diagnostics and repairs, and…
Serves public sector and commercial property operators in Leicestershire, Nottinghamshire and surrounding areas, including academies, universities, local authorities, NHS facilities, nursing homes…
Financial Health
HealthyHealthy · Growing · 3% CAGR over 2y
Location
Building Controls Specialists Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation, integration and support for building management systems (BMS) and HVAC control systems. Supplies Trend and Tridium-based controls, energy management solutions, and…
Serves public and private sector facilities and estates teams with commercial buildings across pharmaceuticals, healthcare, schools, universities, multi-site retail, leisure centres and museums,…
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 2y
Location
G & R REFRIGERATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -73% CAGR over 4y
Location
A. TAYLOR AND SONS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · -90% CAGR over 2y
Location
Dust and Fume Filtration Ltd.
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
JS Cooling Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides installation, upgrade, and replacement of gas boilers and central heating systems. Offers boiler repairs, annual servicing, maintenance plans, plumbing and heating services, and emergency…
Serves homeowners, landlords and large commercial enterprises needing boiler and central heating support across Leicestershire, Nottinghamshire, Derbyshire and Warwickshire.
Financial Health
StableStable · Hiring · 10% CAGR over 2y
Location
S.S.HEATING LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak
Location
FASTFLOW PLUMBING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
AMG Plumbing & Heating Services Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Growing, Hiring · 26% CAGR over 3y
Location
Gas And Bijli Ltd.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
Midlands Heat Elite Limited
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Reheat Leicester Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
MIDLAND VENTILATION SUPPLIES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides ventilation system services including duct cleaning and fire damper testing for commercial and industrial buildings. Also supplies ventilation equipment such as fans, ductwork and related…
Serves industrial and commercial organisations across the UK, especially commercial kitchens, building operators and construction-sector clients with ventilation system requirements.
Financial Health
StableStable · -57% CAGR over 5y
Location
NM Mechanical Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
JR Heating Midlands Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable · Hiring · 14% CAGR over 3y
Location
PLATINUM PLASTERING & DRY LINING LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy · 0% CAGR over 3y
Location
Gasco Services Leicester Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
ARV Group Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
A.C.R.C. Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls, services and maintains air conditioning systems for domestic, commercial and industrial premises. Provides system design, consultancy, repairs and maintenance for units in offices, data…
Serves commercial and domestic customers in Leicester, Leicestershire and across the UK, including offices, labs, clean rooms, server rooms, data centres, retail outlets, pubs, clubs, restaurants,…
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
Crown Heating Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies and installs industrial and commercial heating and ventilation systems, including ductwork and energy conservation measures. Provides commissioning, compliance testing, planned…
Serves industrial and commercial organisations in the Midlands needing heating and ventilation contractors, including businesses within 50 miles of Leicester for ongoing maintenance and emergency…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Glenfield Air Conditioning Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides air conditioning system design, supply and installation for residential, commercial and retail properties. Offers maintenance, servicing and repair, as well as portable air conditioning hire…
Serves businesses, contractors, developers, landlords, homeowners, retailers, rural communities and health service providers in Leicester and the Midlands needing air conditioning solutions.
Financial Health
StableStable · 0% CAGR over 2y
Location
RJD AIR CONDITIONING SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls and maintains air conditioning systems for domestic and commercial properties. Services include system design, supply and installation of wall, ceiling and floor-mounted units, and ongoing…
Serves domestic homeowners and commercial clients needing air conditioning, including hotels, hospices and offices, primarily in Leicester and Leicestershire with projects across the UK.
Financial Health
StableStable · 0% CAGR over 2y
Location
LEICESTER AIR CON LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs air conditioning systems for domestic and commercial properties, including split, multi‑split, ducted and cassette units. Provides system design, maintenance, servicing, fault…
Serves homeowners, domestic customers, small offices and larger commercial clients across Leicester and surrounding Leicestershire towns.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
LINK CLIMATE SERVICES LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation, commissioning and maintenance of heating, air conditioning, ventilation and electrical systems. Also installs renewable energy technologies including solar panels and…
Serves commercial, industrial and domestic customers, including public-sector leisure centres, hotels, nightclubs, bars, restaurants, large retailers, office blocks, football stadiums and other…
Financial Health
StableStable · Hiring · 32% CAGR over 2y
Location
TJ Hall Electrical & Mechanical Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical installation services for commercial, industrial, and residential projects, including power installations, plumbing and heating, fire alarm systems, structured…
Serves businesses, public sector bodies and residential property owners, mainly across the East Midlands, including commercial, industrial, logistics, office fit-out, accommodation, education, hotel,…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 4y
Location
Highcross Building Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services, including design and installation of lighting, power and electrical distribution systems, heating and hot water systems, air conditioning,…
Serves businesses, contractors and project clients in Leicestershire requiring mechanical and electrical building services for design-and-build or pre-designed projects.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
EMPIRE DRINKS AND REFRIGERATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs draught soft drink dispense systems and post‑mix syrups, including bag‑in‑box concentrates and dispensers. Provides commercial refrigeration, ice machines, cellar cooling and…
Sells to hospitality, leisure and foodservice businesses, including pubs, bars, nightclubs, restaurants, cafés, fast food outlets, cinemas, bowling alleys, children’s play centres and shops needing…
Financial Health
StableStable · -68% CAGR over 4y
Location
ACVR SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical services contracting including design, installation and maintenance of HVAC systems such as air conditioning, ventilation, ductwork and chillers. Also delivers specialist…
Serves commercial organisations, especially healthcare and medical imaging estates teams, hospitals, clinics and MRI scanner manufacturers, as well as facilities managers needing specialist support…
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 2y
Location
GREEN ABILITY SYSTEMS LIMITED
Trajectory
4y · 2022–NowDesigns, installs and services commercial HVAC systems including air conditioning, evaporative cooling, ventilation, warm air and radiant heating, and commercial boilers. Provides maintenance,…
Serves B2B customers across England, including offices, warehouses, factories, retail premises and other commercial sites, typically buyers responsible for workplace heating, cooling, ventilation and…
Financial Health
Insufficient historyInsufficient history
Location
Hinckley Plumbing And Heating Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic and commercial plumbing and heating services, including installation, servicing and repair of gas, oil and electric boilers, air source heat pumps and heating systems. Also carries…
Serves homeowners and commercial organisations needing plumbing, heating and related building services across Hinckley, Nuneaton, Leicester, Coventry, Tamworth, Rugby and surrounding areas.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
S. TYSOE INSTALLATIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls, maintains and repairs commercial and industrial cold rooms, including walk‑in chillers and warehouse freezers. Provides coldroom refurbishment, panel repairs, firewalls and firestopping,…
Serves UK businesses operating cold rooms, from industrial warehouse freezer operators to smaller sites with walk-in chillers, including organisations needing maintenance, emergency repair support,…
Financial Health
StableStable · -70% CAGR over 4y
Location
HANDS ON MEP LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains mechanical and electrical building systems for commercial premises, including plumbing, heating, air conditioning, ventilation, water services and electrical systems.…
Serves main contractors, architects, commercial end users and local authorities across the UK, with customers in defence, healthcare, leisure, retail, education, industrial premises and new-build…
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
Acorn Mechanical Pipework Services Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical engineering services including pipework installation, HVAC, heating, chilled water, ventilation, plumbing, and power and lighting systems. Offers design,…
Serves B2B and public-sector clients in healthcare, education and industrial built environments across the UK, including hospital estates teams, schools, universities, contractors and facilities or…
Financial Health
StrongStrong · Hiring · 6% CAGR over 2y
Location
TRIAC AIR CONDITIONING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs air conditioning and HVAC systems for commercial projects, providing turnkey packages with project management. Carries out servicing, maintenance and replacement of chillers and…
Serves businesses and organisations with commercial buildings or facilities that require air conditioning, HVAC, chiller or heat pump systems, from single installations to complex turnkey projects.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
Location
ARTHUR POLLARD LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical building services contracting for commercial, industrial and public sector projects, including design, supply, installation and commissioning of mechanical systems in new and…
Serves public-sector organisations, private-sector commercial and industrial clients, and manufacturers, including universities, schools, hospitals, food factories and processing businesses.
Financial Health
HealthyHealthy · -2% CAGR over 2y
Location
JML CONTRACTORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services including installation and maintenance of air conditioning and refrigeration systems, solar PV, EV charging points, air source heat pumps,…
Serves homeowners and commercial and industrial organisations across the UK, including offices, branch networks and property owners needing building services infrastructure.
Financial Health
StableStable · -64% CAGR over 4y
Location
Teper Mep Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical, electrical and plumbing (MEP) design and installation services for construction projects. Services include ventilation systems, electrical installations, lighting, security…
Serves construction contractors, developers and property owners in the East and West Midlands, across high-end residential, commercial, industrial and public-sector building projects.
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 2y
Location
Dakro Air & Water Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides Legionella risk assessments, testing and compliance services, alongside water treatment and air hygiene solutions. Conducts ductwork cleaning, fire damper testing, air quality monitoring,…
Serves businesses and facilities managers responsible for commercial and industrial buildings, including sites with water systems, cooling towers, boilers, ductwork, fire dampers and swimming pools.
Financial Health
StrongStrong · Growing · 8% CAGR over 1y
Location
MV Installations Electrical Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including installations, rewiring, upgrades and compliance work, alongside installation and maintenance of air-conditioning and ventilation systems for…
Serves homeowners and businesses, including commercial, industrial and agricultural customers, in the Market Harborough area.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
HAGGER GROUP LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides design, consultancy, installation, testing, commissioning and maintenance of electrical and mechanical systems, including street lighting and electric vehicle charging infrastructure, with…
Financial Health
DistressedDistressed · -13% CAGR over 3y
Location
Envtec Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls, maintains and repairs heating and air conditioning systems. Provides planned preventative maintenance and reactive service for commercial, education, leisure and domestic properties,…
Serves nationwide direct end users, contractors and facilities management companies across education, commercial, leisure and domestic sectors, including organisations requiring DBS-checked engineers.
Financial Health
StableStable · 3% CAGR over 2y
Location
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How Leicester HVAC companies work and how to sell to them
What they do
HVAC companies earn through a blend of recurring maintenance, reactive repair, installation and replacement work. The steadier revenue usually comes from planned service agreements covering boilers, chillers, air-handling units, ventilation plant, refrigeration equipment and cold rooms; margin then depends on labour utilisation, parts supply, call-out recovery and avoiding repeat visits. Project work is usually quoted per site or per asset, with separate allowances for materials, subcontracted trades and commissioning. Emergency work tends to be priced through call-out fees, hourly engineering rates and parts mark-up. The service is physical and labour-intensive, but the commercial wrapper is increasingly administrative: compliance certificates, asset registers, visit logs and audit-ready service histories matter alongside the repair itself.
Who they sell to
Most Leicester HVAC contractors sell to organisations that own, lease or manage occupied buildings rather than to private consumers. Typical buyers include facilities managers, estates teams, operations directors, property managers, finance leads and site managers with direct accountability for uptime, tenant comfort, stock protection or statutory checks. Smaller contracts are often won through referrals, local search and direct quotation, while larger public-sector, healthcare or multi-site commercial work tends to involve approved supplier lists, facilities-management intermediaries, framework-style procurement or formal tendering. Sales cycles vary by urgency: a failed refrigeration unit can move in hours, while planned replacement, decarbonisation or multi-building maintenance work usually requires surveys, budgeting and internal sign-off.
What they buy
Most HVAC firms tend to spend on tools that keep engineers billable and paperwork defensible. Field-service management, scheduling, route planning, mobile job sheets, quoting, CRM, invoicing and stock-control systems are natural fits, particularly where a contractor is moving beyond owner-led coordination. Compliance and health-and-safety services also matter: risk assessments, training, certification management, insurance, contract templates and accountancy support all sit close to revenue. Recruitment, apprenticeship support and specialist engineering training are often more relevant than generic office services because capacity is constrained by qualified labour. Marketing spend is usually pragmatic, centred on local search visibility, review management, sector-specific content and bid support for facilities, public-estate and commercial-property work.
Why and how to sell to them
HVAC buyers tend to evaluate suppliers when operational friction becomes visible: engineers spend too much time on admin, first-time fix rates fall, parts are hard to track, invoices lag behind completed work, or service evidence is difficult to produce for customers. Hiring engineers, adding vans, winning a larger maintenance book, taking on public-sector work or expanding into refrigeration can all create buying moments. Outbound messaging works best when it is tied to cash collection, engineer utilisation, compliance evidence or response-time protection, rather than abstract efficiency claims. Local proof points matter, but they should be framed around contractor type, site mix and service radius rather than named customers.
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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