Company lists · Data refreshed September 2026
Top 25 Retrofit consulting companies based in the United Kingdom
RevenueBase identified 369 retrofit consulting companies headquartered in the United Kingdom as of September 2026 and tracks 2,170 professional contacts across them, including 958 with verified work emails. London is the largest hub.
This list covers retrofit consulting companies 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 29, 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 retrofit consulting companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 60 contacts → | ||||
Partial evidence “RSP Consulting Engineers LLP are leaders in sustainable and low energy building services design.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 55 contacts → | ||||
Indirect evidence “Forcia Limited is a construction company based out of Park Hill, London, United Kingdom.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 53 contacts → | ||||
Partial evidence “At Method Consulting, we are specialists in engineering and sustainability solutions, focusing on building services and sustainability for the built environment.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 48 contacts → | ||||
Indirect evidence “CAD 21 are professional design consultants in the field of Building Services Engnerring encompassing the following specialist areas: Air Conditioning Domestic Water Services Power…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 47 contacts → | ||||
Indirect evidence “We are Crookes Walker and we do things differently.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 45 contacts → | ||||
Indirect evidence “Silcock Dawson & Partners are a leading firm of Building Services and Energy Consultants.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 41 contacts → | ||||
Indirect evidence “If you need a professional consultancy to assist you with your building engineering services needs, then SVM Associates can help.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 38 contacts → | ||||
Indirect evidence “Focus FM is a consultancy that specialises in the built environment and offers a wide range of services, delivering technical advice and support to satisfy the demanding…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 31 contacts → | ||||
Indirect evidence “We believe that if you understand your environmental targets, you will have a better understanding of their real-world impacts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 29 contacts → | ||||
Indirect evidence “At the heart of SRE lies a passionate commitment: to ensure a sustainable built environment.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 26 contacts → | ||||
Indirect evidence “The practice was established by Steve Hunt in 1988 and has focused on quality growth to match demand whilst maintaining stability, a desire to succeed and a commitment to…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 26 contacts → | ||||
Indirect evidence “Our founder, Simon Flatt, started the practice in 2003 to provide sustainable engineering solutions of the highest quality and standard.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 25 contacts → | ||||
Indirect evidence “London Structures Lab believe there is a way to do things better.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 24 contacts → | ||||
Indirect evidence “Taylor Project Services LLP (TPS) are qualified CIBSE Building Services + Energy/Sustainability Engineers specialising in the Design and Specification of Mechanical, Electrical…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 24 contacts → | ||||
Indirect evidence “Blue Engineering is a structural engineering firm based in Shoreditch, London.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 23 contacts → | ||||
Indirect evidence “GreenLight is a UK based engineering group established in 2008 that specializes in commercial fit-out, facility management, and renewable energy services with a core focus on…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 23 contacts → | ||||
Indirect evidence “Established in 1988 SDA are Sheffield’s longest-running independent Building Services Engineering Consultants.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 23 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 22 contacts → | ||||
Indirect evidence “Symmetrys Limited is a leading practice of structural engineering consultants based in North London.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 21 contacts → | ||||
Partial evidence “When you need a seamless, cost efficient path to compliance let us take the hassle out of sustainability, overheating and retrofit.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 20 contacts → | ||||
Partial evidence “We employ some of the best Retrofit Assessors and Retrofit Coordinators in the industry.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 18 contacts → | ||||
Indirect evidence “bianco sale limited are Building Services Consultants, Low Carbon Designers and Energy Advisers and offer a range of services on new build projects, building refurbishments and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 18 contacts → | ||||
Indirect evidence “We are a team of passionate, high calibre building services design consultants who create technically excellent solutions for our clients’ projects.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 18 contacts → | ||||
Indirect evidence “Vector Design has achieved a reputation for high quality and value in an ever competitive and technically challenging market place.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 17 contacts → | ||||
Partial evidence “Established in 2015 Wilson Gray Consulting is a mechanical and electrical building services practice offering a range of traditional design and low carbon technology solutions for…” Source: RevenueBase Database · checked Sep 29, 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: retrofit consulting companies. 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 retrofit consulting companies.
- Partial evidence
- Its own public description names part of retrofit consulting companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name retrofit consulting companies. 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 369 retrofit consulting companies based in the United Kingdom
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Retrofit consulting companies based in the United Kingdom at a glance
As of Sep 29, 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 369 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 retrofit consulting companies, 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 “retrofit consulting companies”. 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 retrofit consulting companies), 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 retrofit consulting companies, 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, 958 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 29, 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.
Retrofit consulting companies by metro
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 retrofit consulting companies, 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 retrofit consulting companies are there based in the United Kingdom?
RevenueBase identified 369 retrofit consulting companies 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?
RSP Consulting Engineers, headquartered in Edinburgh, tops this list with the largest team on record.
Which city has the most retrofit consulting companies?
London leads with 75 headquartered companies, followed by Manchester (10) and Birmingham (9).
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 958 verified decision-maker contacts tracked across these 369 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 29, 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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