02 · Building Regulations · Part L
Air tightness testing in the South East
87 providers offering air tightness testing in or across the South East, including national firms. A tester registered with a recognised scheme such as ATTMA or iATS.
Who needs oneAnyone building a new home
Who can do itA tester registered with a recognised scheme such as ATTMA or iATS
WhenWhen the building envelope is complete, before the as-built SAP
87 air tightness testers for the South East
Featured (paid) listings first, then A–Z · How we check listings
Showing all 87 providers
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Based in or covering the South East (43)
Acoustic South East
Based in West Sussex · Covers West Sussex Accreditation stated by provider: ATTMAAF Acoustics
Based in West Ealing, London · Covers London and South East counties Accreditation stated by provider: ATTMAOwn website
Air L&B Air Tightness Testing
Based in Berkshire · Covers Berkshire Accreditation stated by provider: ATTMAAir Leakage Testing Ltd
Based in Aylesbury, Buckinghamshire · Covers London, the Home Counties and the rest of England and Wales Accreditation stated by provider: ATTMA, UKAS (No. 2808)Own website
Air Tightness Solutions Ltd
Based in Oxfordshire · Covers Oxfordshire Accreditation stated by provider: ATTMAAir Tightness Testing (UK) Ltd
Based in Maldon, Essex · Covers Mainland England, mainly London, the Home Counties and East Anglia Accreditation stated by provider: iATS, ElmhurstOwn website
Airtight Noisecheck Ltd
Based in Hampshire · Covers Hampshire Accreditation stated by provider: ATTMAAttune Acoustics Limited
Based in Hampshire · Covers Hampshire Accreditation stated by provider: ATTMABuilding Compliance Testing
Based in Not stated · Covers London, Home Counties, East Anglia and the South East Accreditation stated by provider: ATTMA, SITMAOwn website
Carlson Associates Ltd
Based in East Sussex · Covers East Sussex Accreditation stated by provider: ATTMAClimat BCT Ltd
Based in Buckinghamshire · Covers Buckinghamshire Accreditation stated by provider: ATTMAEnergytest
Based in Tunbridge Wells, Kent · Covers London and the South East; nationwide Accreditation stated by provider: ATTMAOwn websiteUK-wide
ERS Consultants
Based in Oxford · Covers UK residential and commercial developments Accreditation not yet checkedOwn websiteUK-wide
Flexy Commercial Group Limited
Based in Buckinghamshire · Covers Buckinghamshire Accreditation stated by provider: ATTMAQuinnRoss 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
RS Energy Ltd
Based in Ringwood, Hampshire · Covers England and the UK Accreditation stated by provider: ABBE, BREOwn website
Sadler Energy & Environmental
Based in Hampshire · Covers Hampshire Accreditation stated by provider: ATTMASEES
Based in Durley, Southampton, Hampshire · Covers UK-wide Accreditation stated by provider: Elmhurst, ATTMA, BREEAM licensed assessor company, Stroma certifiedOwn websiteUK-wide
Sound Advice Acoustics Ltd
Based in Hampshire · Covers Hampshire Accreditation stated by provider: ATTMASouthern Energy Consultants
Based in Berkshire · Covers Berkshire Accreditation stated by provider: ATTMASydenhams Timber Engineering
Based in Hampshire · Covers Hampshire Accreditation stated by provider: ATTMATest It Services
Based in West Sussex · Covers Sussex, Kent, Surrey, London and Hampshire Accreditation stated by provider: ATTMAOwn website
Thames Valley EPC
Based in Reading, Berkshire · Covers Berkshire Accreditation stated by provider: Elmhurst EnergyOwn website
Tophouse Assessments
Based in Chatham, Kent · Covers Kent, London and the Home Counties Accreditation stated by provider: iATSOwn website
Winthorpe Management Services Ltd t/a WMS
Based in Kent · Covers Kent Accreditation stated by provider: ATTMANational providers (check they cover your area) (44)
Acoustic Consultants Ltd
Based in Bristol · Covers Across the UK Accreditation stated by provider: UKAS, ANC, IOAOwn websiteUK-wide
Adnitt Acoustics
Based in Surbiton, London · Covers UK-wide; offices in Surbiton and Glasgow Accreditation stated by provider: ANCOwn 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
Air Testing UK Ltd
Based in Manchester · Covers Nationwide Accreditation stated by provider: iATS, BINDT, BPEC, AECBOwn websiteUK-wide
Airtight Testing Staffordshire
Based in Stoke-on-Trent · Covers Staffordshire and UK-wide Accreditation stated by provider: ATTMAOwn websiteUK-wide
APT Sound Testing (Air Pressure Testing Ltd)
Based in Upper Sundon, Bedfordshire · Covers Coventry, Warwickshire and UK-wide Accreditation stated by provider: UKAS accredited testing laboratory (No. 4340)Own 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
Compliance 4 Buildings
Based in Hornchurch, Essex · Covers Nationwide (UK) Accreditation stated by provider: ATTMAOwn websiteUK-wide
Coventry Property Certification
Based in Coventry, West Midlands · Covers England and Wales Accreditation not yet checkedOwn websiteUK-wide
DAA Group
Based in London · Covers Nationwide across the UK Accreditation stated by provider: ATTMA, BPECOwn websiteUK-wide
E2 Specialist Consultants
Based in Birmingham office (head office Wakefield) · Covers Birmingham and 25+ West Midlands towns Accreditation stated by provider: SITMA, iATSOwn 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
Energycount
Based in Poole, Dorset · Covers Nationwide (UK) Accreditation not yet checkedOwn websiteUK-wide
Energyprotech Ltd
Based in Coniston, Cumbria · Covers Cumbria, the Lake District and the North West; also nationwide Accreditation stated by provider: StromaOwn 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
Environmental Economics
Based in Luton, Bedfordshire · Covers UK nationwide, including London Plan work Accreditation stated by provider: Elmhurst (overheating scheme)Own websiteUK-wide
EPC Assess Ltd
Based in Midlands · Covers Birmingham, Wolverhampton, Coventry and UK-wide Accreditation not yet checkedOwn 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
Gradwell Group
Based in Doncaster, South Yorkshire · Covers England-wide Accreditation not yet checkedOwn websiteUK-wide
HA Acoustics
Based in Harlow, Essex · Covers East Anglia, London, South West and nationwide Accreditation stated by provider: UKAS, iATSOwn websiteUK-wide
KP Acoustics
Based in UK (several offices) · Covers Throughout the UK Accreditation stated by provider: UKASOwn websiteUK-wide
Manchester EPC Ltd
Based in Cheadle, Greater Manchester · Covers EPC visits within about 50 miles of Manchester; SAP and new-build work nationwide Accreditation not yet checkedOwn 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
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
MSAFE
Based in Bournemouth, Dorset · Covers Nationwide Accreditation stated by provider: UKAS (sound insulation testing)Own websiteUK-wide
Peninsular Acoustics
Based in UK (several offices) · Covers Nationwide Accreditation stated by provider: ANCOwn websiteUK-wide
Purple Energy Solutions
Based in UK (several offices) · Covers Nationwide Accreditation stated by provider: ATTMA, UKASOwn websiteUK-wide
Ratio Seven
Based in Nantwich, Cheshire · Covers Nationwide including Birmingham and the West Midlands Accreditation not yet checkedOwn websiteUK-wide
Sound Solution Consultants
Based in Ipswich, Suffolk · Covers Nationwide Accreditation stated by provider: UKAS, IOAOwn 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
Spratt + Hamer
Based in Liverpool · Covers England, Wales and Northern Ireland Accreditation stated by provider: UKAS (No. 4088), ATTMAOwn 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
Air tightness testing in other regions
London (26) East of England (38) South West (35) West Midlands (23) East Midlands (16) Yorkshire and the Humber (15) North West (12) North East (3) Wales (4) Scotland (22) Northern Ireland (17)
About air tightness testing
An air tightness test measures how much air leaks out of a building through gaps in its fabric. Under the 2021 Approved Document L, every new home in England should be tested, and the result feeds into the as-built SAP calculation.
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.