Air Leakage Testing

What Air Leakage Testing does

Air Leakage Testing Ltd is a UK-based, privately-held accredited building performance testing firm founded in 2002 and headquartered in Aylesbury, Buckinghamshire. The company delivers three core compliance testing services: air tightness testing for Approved Document L (energy efficiency), UKAS-accredited sound insulation testing for Approved Document E, and air flow rate testing of domestic ventilation for Approved Document F. Testing is performed on-site by directly employed, ATTMA-registered and UKAS-accredited engineers using blower door fans, pink noise loudspeakers, sound level meters and calibrated anemometers, with certificates typically issued within one working day. The firm also offers air/smoke control testing for smoke shafts, isolation facilities, plenums, data centres and gas-suppression room integrity, plus complementary acoustic consultancy delivered through a sister company and partner network.

The business operates a direct-to-customer professional services model, with revenue generated per test or per engineer-day at unit prices ranging from around £40-60 per multi-unit residential test to £650-850 per engineer per day on complex commercial projects. Customers span residential developers and housebuilders, commercial building contractors, individual homeowners, educational institutions and healthcare facilities, with named engagements including BAM, Midas Structural, Carter Lauren Construction (Premier Inn Cardiff), Thomas Homes and Hoopers Homes. Go-to-market is exclusively direct via website quote forms, phone and email, supported by case studies, Google reviews and LinkedIn/Facebook presence; no resellers or third-party channels are used. Service coverage spans England and Wales, anchored by regional offices in Buckinghamshire, Essex, Surrey and Kent.

The firm was originally founded by Keith Bartlett, Rob Jenkins and John, was acquired in 2017 by Robust Testing Solutions Ltd (Tom Gregory, Scott Bartholomew and Stephen Hayden), and has since expanded its service portfolio into PassivHaus/low energy testing, hospital isolation suites and combined air-and-sound testing. The three current co-owners hold more than 40 years of combined testing experience between them. There is no evidence of external investment, subsidiaries, or material headcount expansion beyond the small team implied by a 1-10 employee count.

Name

Air Leakage Testing

Legal name

Air Leakage Testing Limited

Website

https://airleakagetesting.co.uk

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

1–10 employees

Short description

Air Leakage Testing Ltd is a UK-accredited building performance testing firm providing air tightness (Part L), sound insulation (Part E), and ventilation flow rate (Part F) testing, plus air/smoke control and acoustic consultancy, to residential developers, commercial contractors, education and healthcare clients across England and Wales.

Ownership category

akta.pro rank

Product category

Building Performance and Compliance Testing Services

NAICS

Testing Laboratories and Services (541380), Building Inspection Services (54135)

SIC

Services-Testing Laboratories (8734)

akta.pro primary industry

Building Compliance Testing & Certification (Backflow, RPZ, Cross-Connection) (BPABAHAK)

Keywords

• Air tightness testing
• Sound insulation testing
• Building regulations compliance
• Ventilation flow testing
• Acoustic consultancy services

Headquarters

HQ city

Aylesbury

HQ country

United Kingdom

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Air Tightness Testing Services: Pressure testing of residential and commercial buildings for Part L compliance, including new builds, existing buildings, and low energy/PassivHaus projects. Pricing varies by property type and size.
2. Sound Insulation Testing Services: UKAS accredited acoustic testing for Approved Document E compliance, covering residential, commercial, educational (BB93), and healthcare (HTM-08) buildings.
3. Ventilation Air Flow Rate Testing: Part F compliance testing for domestic extract ventilation systems including System 1, System 3 (MEV), and System 4 (MVHR).
4. Acoustic Consultancy: Complimentary acoustic consultancy services including planning noise assessments, Section 61 notices, design advice, BB93 education consultancy, HTM-08 healthcare consultancy, and reverberation calculations. Provided through sister company and trusted partners.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Air Leakage Testing Ltd is a UK-based specialist building performance testing firm offering accredited air tightness testing, sound insulation testing, and ventilation flow rate testing services. Its work supports developer, contractor, and housebuilder compliance with UK Building Regulations Part L (energy efficiency), Part E (sound), and Part F (ventilation). The firm also provides acoustic consultancy for domestic, commercial, educational, and healthcare clients.

Product overview

Air Leakage Testing Ltd provides a suite of building performance testing services centered on three core offerings: Air Tightness Testing for Energy Efficiency (Part L compliance, covering residential, commercial, low energy/PassivHaus, and existing buildings), Air Tightness for Air/Smoke Control (smoke shafts, isolation facilities, plenums, data centres), and Sound Insulation Testing (UKAS accredited for Part E compliance across residential, commercial, education, and healthcare sectors). The company also offers Flow Rate Testing of Ventilation (Part F compliance) and Acoustic Consultancy services. Services can be combined on the same visit by dual-trained engineers, and the company operates through partnerships with sister company Robust Testing Solutions Ltd and trusted acoustic consultants.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Certificate turnaround within 1 working day
• +2 more outcomes

Named customers8 records

Segments6 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Robust Testing Solutions LtdcoreStrategic or Co-development PartnerSister company providing acoustic consultancy services where potential conflict of interest exists with UKAS accredited testing services. Three owners of Air Leakage Testing Ltd (Tom Gregory, Scott Bartholomew, Stephen Hayden) previously acquired ALT from Robust Testing Solutions Ltd in 2017.
• Independent Acoustic ConsultantsminorImplementation/ SI/ Consulting PartnerTrusted partner network of independent acousticians providing design advice, remedial solutions for failed tests, and specialised acoustic consultancy services including BB93 education and HTM-08 healthcare acoustic consultancy.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Bureau Veritas: Global testing, inspection, and certification (TIC) giant offering building compliance testing including air tightness and acoustic services across the UK. Operates at much larger scale than ALT with national coverage and broader service portfolio.
• Socotec UK: Major UK testing and compliance services provider covering air tightness, sound insulation, and broader building performance services. Competes with ALT particularly on commercial and regulated projects at scale.
• Stroma Built Environment: UK building compliance and energy assessment provider offering air tightness testing alongside SAP, EPC, and acoustic services. Competes with ALT on bundled compliance offerings for developers.
• BRE (Building Research Establishment): UK building science research and testing organisation offering air permeability and acoustic testing services. A broader player with deep technical authority and national reach that overlaps with ALT's compliance testing niche.

Direct peers

• AC Testing: UK acoustic and air tightness testing provider covering Part E sound and Part L air leakage testing for new build and refurbishment projects. Direct competitor with similar service mix and ATTMA/UKAS accreditations.
• Air Tightness Solutions: UK air tightness testing company providing ATTMA-registered Part L compliance testing across residential, commercial, and PassivHaus projects. Comparable niche specialist competing for the same developer customer base.
• Soundtesting.co.uk (Acoustic & Air Testing): UK provider of Part E sound insulation testing and Part L air tightness testing for residential and commercial properties. Closest direct competitor to ALT with comparable service bundles and geographic coverage.
• Building Innovation & Design (BIND): UK-based building performance consultancy offering air tightness testing and acoustic testing services. Direct competitor serving residential and commercial developers with similar ATTMA-registered testing offerings.
• Hi-Reliability Air Tightness Testing: UK-based ATTMA-registered air tightness testing specialist serving residential and commercial developers. Directly comparable service offering targeting the same Part L compliance customer segment as ALT.
• TestAir (PCC Ltd): ATTMA-registered air tightness testing company serving UK housebuilders and commercial developers. Competes head-to-head with ALT for residential new-build Part L compliance work.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/100070186471803
• LinkedInlinkedin.com/company/air-leakage-testing-ltd

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Air Leakage Testing