AssessPlus
Based in Brentwood, Essex · Covers Essex and East London Accreditation stated by provider: Elmhurst Energy, ECMK, TrustMarkOwn website
03 · Existing buildings & works · PAS 2035
Retrofit assessment in London
35 providers offering retrofit assessment in or across London, including national firms. A qualified Retrofit Assessor working under a TrustMark-registered scheme.
Who needs oneHomeowners and landlords improving energy efficiency under PAS 2035, including most funded schemes
Who can do itA qualified Retrofit Assessor working under a TrustMark-registered scheme
WhenAt the start, before measures are designed
35 retrofit assessors for London
Featured (paid) listings first, then A–Z · How we check listings
Showing all 35 providers
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Based in or covering London (20)
Base Energy
Based in Staines-upon-Thames, Surrey and Bootle, Merseyside · Covers UK-wide, including London Accreditation stated by provider: Elmhurst, CIBSE, TrustMark, BREEAMOwn websiteUK-wide
Building Compliance Testing
Based in Not stated · Covers London, Home Counties, East Anglia and the South East Accreditation stated by provider: ATTMA, SITMAOwn website
Callum Martin Energy
Based in Not stated · Covers London, Essex, Hertfordshire and Cambridge Accreditation not yet checkedOwn website
Carn Energy
Based in South London (SE21) · Covers Lambeth, Southwark and Wandsworth Accreditation stated by provider: ABBE, TrustMarkOwn website
Compliant Retrofits Ltd
Based in Manchester · Covers UK-wide, including London Accreditation stated by provider: TrustMarkOwn websiteUK-wide
Efficient Energy Homes Ltd
Based in London (N1) · Covers London Accreditation stated by provider: TrustMark, Level 5 Retrofit CoordinatorOwn website
Energy Assessors London (EAL Consult)
Based in Willesden, London · Covers London Accreditation stated by provider: Elmhurst, ECMK, BRE, TrustMarkOwn website
Envirocept
Based in London · Covers All of London, other areas on request Accreditation stated by provider: Elmhurst, ECMK, Level 3 Retrofit Assessor, Level 3 Domestic Energy AssessorOwn website
EPC Bromley
Based in Bromley · Covers London Borough of Bromley and surrounding areas Accreditation stated by provider: Elmhurst, TrustMarkOwn website
Gio Property Solutions
Based in Upminster, London · Covers London and Essex Accreditation stated by provider: iATS, Elmhurst, Stroma, ECMK, TrustMarkOwn website
Greener Homes Consultancy
Based in Bristol · Covers Bristol, Reading, London and Durham Accreditation not yet checkedOwn website
Keegans
Based in London (SE1) · Covers UK-wide, with offices in London and Glasgow Accreditation stated by provider: TrustMark, Elmhurst, RICSOwn website
Larksons
Based in South East London · Covers South East, South West and North London, Westminster and Bromley Accreditation stated by provider: Elmhurst, TrustMarkOwn website
MES Building Solutions
Based in Newark, Nottinghamshire · Covers Throughout the UK (offices in Newark, London and Birmingham) Accreditation stated by provider: ATTMA, Elmhurst, AECB, TrustMarkOwn websiteUK-wide
Mill Energy
Based in Tadworth, Surrey · Covers London, Surrey, West Sussex and Kent Accreditation stated by provider: TrustMark, ElmhurstOwn website
Purple Energy Solutions
Based in UK (several offices) · Covers Nationwide Accreditation stated by provider: ATTMA, UKASOwn websiteUK-wide
Ridge and Partners LLP
Based in Oxford (head office) · Covers UK office network including London Accreditation not yet checkedOwn website
SG-ENERGYPLANS
Based in East London · Covers East London, wider London and Essex Accreditation stated by provider: StromaOwn website
WRAP Retrofit
Based in Teddington, London · Covers UK-wide Accreditation stated by provider: RIBAOwn websiteUK-wide
National providers (check they cover your area) (15)
2035 Assessments
Based in Higham, Bury St Edmunds, Suffolk · Covers East of England and throughout the UK Accreditation stated by provider: TrustMark, Elmhurst, ECMK, RICS, CIOB, CIAT, MCSOwn websiteUK-wide
AES Sustainability Consultants
Based in Tiverton, Devon · Covers England, Scotland and Wales Accreditation stated by provider: ATTMA, SITMA, Elmhurst, ECMK, TrustMark, BREEAM, PassivhausOwn websiteUK-wide
Building Energy Experts
Based in Bristol · Covers Nationwide Accreditation stated by provider: Elmhurst, ATTMA, TrustMark, Retrofit Academy (Corporate Member), Retrofit Academy Corporate Member, AECBOwn websiteUK-wide
Coactivation
Based in Derby · Covers Midlands locally, UK-wide for larger schemes Accreditation stated by provider: TrustMark, ElmhurstOwn websiteUK-wide
Crawford & Co Surveyors
Based in Beeston, Nottinghamshire · Covers Nationwide, across the UK Accreditation stated by provider: RICS, CIOB, Elmhurst, TrustMarkOwn websiteUK-wide
Energy Counsel
Based in Manchester, Greater Manchester · Covers Manchester, the North West and nationwide Accreditation stated by provider: CIBSE, BPEC, iATS, SITMA, BREEAM, AECB, ConstructionlineOwn websiteUK-wide
EnergyWise Services
Based in Belfast, Northern Ireland · Covers UK-wide (remote delivery available) Accreditation not yet checkedOwn websiteUK-wide
EPC Assess Ltd
Based in Midlands · Covers Birmingham, Wolverhampton, Coventry and UK-wide Accreditation not yet checkedOwn websiteUK-wide
kW Energy Consultants Ltd
Based in Ruddington, Nottingham · Covers East Midlands and nationwide Accreditation not yet checkedOwn websiteUK-wide
Litegreen
Based in Wrexham · Covers North Wales and the whole UK Accreditation stated by provider: TrustMark, Stroma, ECMKOwn websiteUK-wide
Midland EPC
Based in Coventry · Covers Coventry and the Midlands, plus UK-wide Accreditation not yet checkedOwn websiteUK-wide
SEES
Based in Durley, Southampton, Hampshire · Covers UK-wide Accreditation stated by provider: Elmhurst, ATTMA, BREEAM licensed assessor company, Stroma certifiedOwn websiteUK-wide
StepSoft Coordination Services
Based in Oldham, Greater Manchester · Covers All ten Greater Manchester boroughs; also works across the UK Accreditation stated by provider: TrustMark, Elmhurst, ECMK, PAS 2035:2023Own websiteUK-wide
UK Building Compliance
Based in Hinckley, Leicestershire · Covers UK-wide (England, Wales, Scotland and Northern Ireland) Accreditation stated by provider: ATTMA, Elmhurst, SITMA, BPEC, UKASOwn websiteUK-wide
UK Energy Assessors
Based in Midlands · Covers East and West Midlands (nationwide network) Accreditation not yet checkedOwn websiteUK-wide
Retrofit assessment in other regions
South East (12) East of England (8) South West (6) West Midlands (8) East Midlands (10) Yorkshire and the Humber (5) North West (12) Wales (4)
About retrofit assessment
A retrofit assessment is the survey that starts any energy-efficiency project run under PAS 2035, the standard behind government-funded schemes and TrustMark-registered work. It records the home, its condition and how it is used, so the right measures can be planned safely.
Getting signed off in England
In England, your council’s building control team or a registered building control approver checks the work. They issue a completion or final certificate once they have the reports they need, such as the as-built SAP, EPC, air test and any sound or ventilation test results.