about us

Air Leakage Testing Ltd has been providing testing services to the construction industry since 2002. 

Our Story


We aim to provide professional and helpful services that evidence compliance with building regulations and enhance energy efficiency.

Our qualified and experienced engineers are experts in:

  • Air tightness – of all building types, sizes and ages, as well as for other applications such as smoke extraction or isolation
  • Sound insulation – for Approved Document E, schools and hospitals
  • Airflow of ventilation testing – for Approved Document F requirements


We improve our service constantly. Informed by industry developments, we have expanded our range of testing services and improved our equipment.


We understand that air and sound testing can be disruptive, so we aim to operate at convenient times and work around other on-site trades.


Air Leakage Testing Ltd is owned by Tom Gregory, Scott Bartholomew and Stephen Hayden. Together they have more than 40 years of combined experience in air tightness and sound insulation testing. They are supported by a team of experienced, knowledgeable and helpful test engineers and office-based staff.

Air Leakage Testing Ltd was established in 2002 and has earned a reputation for efficient, cost-effective and responsive testing services.

Tom Gregory

Tom Gregory

Tom has been working in the construction testing industry since 1999. As well as the practical experience gained from many years of testing and consultancy, he has an IoA Diploma in Acoustics and Noise Control and is ATTMA Registered for L1, L2 and L4 testing.

Scott Bartholomew

Scott Bartholomew

Scott has been working in building testing since 2008. Prior to that he worked in construction in the door and window industry. He undertakes the full range of testing services offered by ALT.

Stephen Hayden

Stephen Hayden

Steve has been working in building testing since 2005. He has built up a huge range of experience in air tightness testing.

Our customers deserve the best

As experts in Air Tightness testing, our experience, knowledge, helpfulness, and professionalism provide customers with an unrivaled testing service.

Our history

Air Leakage Testing Ltd was established in 2002, the company and the industry have come a long way in this time:

Initial Meeting

In a series of social meetings in pubs, eateries and garden outbuildings, Keith Bartlett, Rob Jenkins and John devised plans to set up an air leakage testing business. The driving force was the Kyoto Protocol, which laid out ambitious goals to reduce global carbon emissions. A key factor in achieving these goals was reducing energy consumption in buildings.


Air Leakage Testing Ltd (ALT) was launched leaving Rob, John and Keith with the daunting task of acquiring everything needed to do the testing – equipment and software weren’t off the shelf at this time. A lot of blood, sweat and beers went into pulling together a rig of testing equipment and creating software to accompany it. Unfortunately, it was stolen from a ‘guarded site’. Undeterred, they started again and were soon air testing to CIBSE TM23 (the 2000 version) and the fledgling Approved Document L.

Growing the team

A fresh-faced, enthusiastic test engineer joins the ALT testing team called Steve Hayden. We will return to him and his rise to air leakage legend status.

Gaining UKAS Accreditation

Approved Document L is revised with greater reference to air leakage testing. There is a requirement of under ’10’ for tested commercial buildings and a sampling regime based on ‘dwelling types’ for houses and flats. ALT gains UKAS accreditation for testing to the Air Tightness Testing & Membership Association as its 7th member.

Meeting new standards

Approved Document L is changed again and, as part of further reductions in the overall energy requirements, almost all buildings need to be tested. The majority need to be tighter than ‘6-8’. Air testing equipment is developing and large fans replace the trailer-mounted monsters that were originally needed for testing large buildings. New test standards are introduced by ATTMA.

further regulation chnages

The energy requirements are tightened again, meaning most buildings need to achieve ‘4-6’ or less. Fans for testing houses and flats continue to get smaller, which increases the volume of testing that can be done in a day. In the beginning, testing a house would keep an engineer occupied all day and the cost reflected this. Now engineers can undertake 20 or more tests in a day (but don’t tell them how easy we had it in the ‘olden days’!).

The new owners

ALT is purchased by Robust Testing Solutions Ltd (comprising Tom Gregory, Scott Bartholomew and the returning Steve Hayden). Robust had been undertaking some of ALT’s testing for a while. They built on the foundations of the company, without losing the technically correct, yet friendly and helpful approach that ALT’s reputation had been built on. The first step was adding UKAS accredited sound testing to ALT’s services.

Expanding our services

Air testing of smoke shafts, plenums, hospital isolation suites, PassivHaus and existing buildings was added to the services. Partnerships formed with trusted experts to offer the full suite of related services, including thermography, acoustic consultancy and energy assessments.

20 years in business

The latest Part L is released which further tightens air testing targets and sees a return to CIBSE TM23 (a new version). Celebrating 20 years in business, Air Leakage Testing continues to expand and develop whilst retaining the underlying ethos. That is, to support our clients in meeting requirements, whilst playing a small part in improving building performance and reducing carbon emissions.

We are a registered ATTMA L1 and L2 air tightness testing company. The Air Tightness Testing & Measurement Association (ATTMA) is a professional association dedicated to technical excellence and commercial effectiveness in all air tightness testing and air leakage measurement applications.

Air Leakage Testing Ltd is an UKAS accredited testing laboratory No. 2808. The scope of the accreditation is for sound insulation testing to Building Regulations Approved Document E: 2003

We hold SSIP Accreditation with Acclaim for Health & Safety

Air Leakage Testing Ltd is a member of Constructionline, the UK Government Certification Service, which promotes excellence in industry standards and best practices.

Get a quote

You can find detailed enquiry forms on our Get a Quote page. Provide us with more information, and we will issue a formal quotation.

Alternatively,  submit basic contact information and your requirements and we will provide an estimated cost.