Company lists · Data refreshed September 2026
Top 25 Building energy auditors based in the United Kingdom
RevenueBase identified 105 building energy auditors headquartered in the United Kingdom as of September 2026 and tracks 363 professional contacts across them, including 136 with verified work emails. London is the largest hub.
This list covers building energy auditors headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest building energy auditors based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 20 contacts → | ||||
Indirect evidence “We employ some of the best Retrofit Assessors and Retrofit Coordinators in the industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 16 contacts → | ||||
Partial evidence “We are independent building performance engineering specialists, working across the built environment to help architects, commercial developers, housebuilders and building owners…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 16 contacts → | ||||
Strong evidence “The Syntegra group of companies is a multi-award winning specialist energy efficiency and low carbon building solutions provider.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 16 contacts → | ||||
Partial evidence “Transforming UK homes and businesses into energy-efficient, future-ready spaces.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 12 contacts → | ||||
Partial evidence “SAP Assessments and Solutions - Design and as built Energy Feasibility Studies Energy Consumption Statements Air Leakage Testing Energy Performance Certificates Part L compliance…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 12 contacts → | ||||
Partial evidence “Welcome to Eco Target – we are energy specialists based in London and our aim is to help our customers save money on energy bills and reduce carbon footprint.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 12 contacts → | ||||
Partial evidence “Established in 2002, we work with housing associations, local authorities, sustainability consultants and building surveyors to help understand and improve the condition and…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 10 contacts → | ||||
Partial evidence “Eco Efficient Home Solutions (EEH Solutions) is a trusted provider of energy efficiency and retrofit services, specializing in sustainable solutions that meet the highest industry…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 8 contacts → | ||||
Strong evidence “An established and extensive provider of Energy Consultancy and Compliance services within the residential, commercial and public building sectors.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 8 contacts → | ||||
Partial evidence “TF Energy is a leading force in the UK retrofit sector, recognised for delivering property upgrade projects to the highest standards.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 7 contacts → | ||||
Indirect evidence “With a combined experience of over 30 years, GRS ECO provide an end-to-end retrofit service from initial enquiry through to survey, coordination and installation giving households…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 7 contacts → | ||||
Partial evidence “CSR Sustain provide a comprehensive suite of energy auditing services to optimise asset and operational performance in properties – increasing their asset value, helping…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 6 contacts → | ||||
Strong evidence “National Retrofit Limited is a specialist retrofit energy consultancy delivering compliant PAS 2035 services that improve building performance, cut operating costs, and reduce…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 5 contacts → | ||||
Strong evidence “A specialist Building Services Consultancy providing a national coverage, NRGFocus delivers a full range of building analysis and energy auditing services designed to identify…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 4 contacts → | ||||
Partial evidence “Eala exists so that building owners and occupiers can make the most of their property today in a way that won’t cost the world tomorrow.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 4 contacts → | ||||
Partial evidence “Digital Buildings provides “With You All The Way” home retrofit services to homeowners and lenders.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 contacts → | ||||
Indirect evidence “End-to-End Retrofit service from assessment, through to Trustmark Lodgement, we have the Gnome how to assist.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 contacts → | ||||
Strong evidence “Kalm was established to help property owners optimise the energy efficiency of their buildings through the most cost effective measures.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 4 contacts → | ||||
Partial evidence “We provide Domestic Energy Assessors and Retrofit Assessors to improve energy efficiency of your property.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 contacts → | ||||
Strong evidence “Advancing Energy LTD are an Energy Assessment and Building Performance Consultancy specialising in both residential and commercial sectors.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Partial evidence “We are a leading name in Compliance Reporting providing professional Environmental Energy Assessment services to Domestic, Commercial and Industrial Organisations.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 contacts → | ||||
Partial evidence “At GBW Retrofit Services Ltd, we bring over a decade of experience in domestic energy efficiency, specialising in retrofit services for existing housing stock across the UK.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Partial evidence “EcoEnergy was founded to provide consultation and energy efficiency assessments in domestic and non-domestic sectors, and in recent times has made a progression into providing…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 contacts → | ||||
Strong evidence “NuPlanet are a building performance consultancy specialising in low-energy and sustainable design.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Indirect evidence “Facility services upgrades need careful consideration.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: building energy auditors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names building energy auditors.
- Partial evidence
- Its own public description names part of building energy auditors, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name building energy auditors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 105 building energy auditors based in the United Kingdom
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Building energy auditors based in the United Kingdom at a glance
As of Sep 16, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 105 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among building energy auditors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “building energy auditors”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names building energy auditors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among building energy auditors, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 136 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names building energy auditors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many building energy auditors are there based in the United Kingdom?
RevenueBase identified 105 building energy auditors headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Osmosis ACD, headquartered in Chorley, tops this list with the largest team on record.
Which city has the most building energy auditors?
London leads with 14 headquartered companies, followed by Edinburgh (3) and Nottingham (3).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 136 verified decision-maker contacts tracked across these 105 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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