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
02 · Building Regulations · Part O
Overheating assessment in London
39 providers offering overheating assessment in or across London, including national firms. Energy assessors or thermal modelling consultants.
Who needs oneAnyone building a new home (not extensions or conversions)
Who can do itEnergy assessors or thermal modelling consultants
WhenDesign stage, before building control approves the plans
39 overheating assessors for London
Featured (paid) listings first, then A–Z · How we check listings
Showing all 39 providers
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Based in or covering London (13)
Building Compliance Testing
Based in Not stated · Covers London, Home Counties, East Anglia and the South East Accreditation stated by provider: ATTMA, SITMAOwn website
Complete EPC
Based in Finchley, London · Covers All of London, and elsewhere in the UK Accreditation stated by provider: Quidos, StromaOwn websiteUK-wide
Elmstead Energy Assessments & Building Services (EEABS)
Based in Colchester, Essex · Covers UK-wide, including London Plan energy assessments Accreditation stated by provider: Elmhurst, CIBSE Low Carbon Consultant, CIBSE Low Carbon Energy Assessor, EDSL TASOwn websiteUK-wide
Energy Assessors London (EAL Consult)
Based in Willesden, London · Covers London Accreditation stated by provider: Elmhurst, ECMK, BRE, TrustMarkOwn website
Environmental Economics
Based in Luton, Bedfordshire · Covers UK nationwide, including London Plan work Accreditation stated by provider: Elmhurst (overheating scheme)Own websiteUK-wide
Innervision Design
Based in Bishop's Stortford, Hertfordshire · Covers Hertfordshire, London and adjacent counties Accreditation stated by provider: StromaOwn website
JAW Sustainability
Based in London (N1) · Covers Projects around the country Accreditation stated by provider: CIBSE Low Carbon ConsultantOwn 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
Peter Deer & Associates (PDA)
Based in Finchley, London · Covers UK, Ireland and international projects Accreditation not yet checkedOwn website
Purple Energy Solutions
Based in UK (several offices) · Covers Nationwide Accreditation stated by provider: ATTMA, UKASOwn websiteUK-wide
QuinnRoss Energy
Based in Sittingbourne, Kent · Covers UK-wide, with a focus on Greater London and the South East Accreditation stated by provider: Elmhurst, UKAS, BRE Global, CIBSE Low Carbon Consultant, Low Carbon Energy AssessorOwn websiteUK-wide
Southern Assessors
Based in Salisbury, Wiltshire · Covers UK-wide, with offices in London, Bristol and Birmingham Accreditation stated by provider: NHEROwn websiteUK-wide
National providers (check they cover your area) (26)
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
Assessment Hive
Based in Goffs Oak, Hertfordshire · Covers London and throughout the UK Accreditation not yet checkedOwn websiteUK-wide
ATSPACE
Based in Royston, Hertfordshire · Covers England and Wales Accreditation stated by provider: Elmhurst, NHER, SITMA, TrustMark, Passivhaus Trust (Patron), BPEC, BSRIA, Passivhaus Trust PatronOwn websiteUK-wide
Briary Energy
Based in Hatfield, Hertfordshire · Covers UK-wide Accreditation not yet checkedOwn websiteUK-wide
Build Energy
Based in UK (several offices) · Covers UK-wide Accreditation not yet checkedOwn 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
Easy EPC Ltd
Based in Brighton, East Sussex · Covers Nationwide, with local landing pages for many UK towns including Leicester, Nuneaton and Coventry Accreditation not yet checkedOwn websiteUK-wide
Energist
Based in Cirencester, Gloucestershire · Covers Nationwide Accreditation stated by provider: Elmhurst, ATTMA, ANCOwn websiteUK-wide
Energy & Design
Based in Cannock, Staffordshire · Covers England, Scotland and Wales Accreditation stated by provider: Scotland Section 6 Approved Certifier of Design, BREEAM UK New Construction (Residential)Own 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
Energy National
Based in Rochdale, Greater Manchester · Covers Greater Manchester and East Lancashire locally; SAP work nationwide Accreditation stated by provider: Elmhurst Energy, Stroma, ABBE, BRE, TrustMarkOwn websiteUK-wide
Energycount
Based in Poole, Dorset · Covers Nationwide (UK) Accreditation not yet checkedOwn websiteUK-wide
EnergyWise Services
Based in Belfast, Northern Ireland · Covers UK-wide (remote delivery available) Accreditation not yet checkedOwn websiteUK-wide
enevo
Based in Birstall, West Yorkshire · Covers UK-wide (national network of local assessors) Accreditation stated by provider: ATTMA, iATS, SITMA, Elmhurst, Stroma Certification, BREEAM, ABBEOwn websiteUK-wide
EPC Experts
Based in Coventry, West Midlands · Covers Coventry, Nuneaton, Rugby, Warwick and nationwide Accreditation not yet checkedOwn websiteUK-wide
Focus 360 Energy
Based in UK (several offices) · Covers Nationwide Accreditation stated by provider: Elmhurst, ECMK, StromaOwn websiteUK-wide
HA Acoustics
Based in Harlow, Essex · Covers East Anglia, London, South West and nationwide Accreditation stated by provider: UKAS, iATSOwn websiteUK-wide
Melin Energy Consultants
Based in Swansea · Covers UK-wide (offices in Swansea, Bristol and London) Accreditation stated by provider: Elmhurst (Approved Psi Value Competency Scheme), BREEAM AP, CIBSE, UK Thermography AssociationOwn websiteUK-wide
PB Sustainability
Based in Wirral, Merseyside · Covers Nationwide Accreditation stated by provider: ABBE, CABE, ElmhurstOwn websiteUK-wide
sap2sbem
Based in Leek, Staffordshire · Covers UK-wide (desk-based) Accreditation stated by provider: ElmhurstOwn 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
Sound Solution Consultants
Based in Ipswich, Suffolk · Covers Nationwide Accreditation stated by provider: UKAS, IOAOwn websiteUK-wide
Stroma Built Environment
Based in Wakefield, West Yorkshire · Covers UK-wide Accreditation stated by provider: UKAS (No. 2731), ATTMAOwn 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
Vision Energy & Sustainability
Based in Bollington, Cheshire · Covers UK-wide Accreditation not yet checkedOwn websiteUK-wide
Overheating assessment in other regions
South East (6) East of England (9) South West (6) West Midlands (5) East Midlands (4) Yorkshire and the Humber (3) North West (6)
About overheating assessment
Part O of the Building Regulations requires new homes to be designed so they do not overheat in summer. You show compliance either with the simplified method or with a dynamic thermal model to CIBSE TM59.
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.