Timeline of Air Leakage Testing

Celebrating 20 years in 2022

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


Over the course of a series of meetings in a range of pubs, eateries and garden outbuildings, Keith Bartlett, Rob Jenkins and John ? devised their plans to set up an air leakage testing business in response to the Kyoto Protocol which laid out ambitious plans to reduce global carbon emissions, key to which was the reduction of energy consumption in buildings.


Air Leakage Testing Ltd (ALT) was born which just left Rob, John and Keith with the daunting task of devising how to actually do the testing – equipment and software weren’t off the shelf at this time. After a lot of blood, sweat and beers they put together a rig of testing equipment and created software to accompany it. Only for it to be stolen from a ‘guarded site’. After putting everything together again they were in a position to start testing to CIBSE TM23 (the 2000 version) and the fledgling Approved Document L.


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.


Approved Document L is revised and there is more reference to air leakage testing with 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 new regulations and joins the Air Tightness Testing & Membership Association as its ?th member.


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


The energy requirements are tightened again such that most buildings need to achieve ‘4-6’ or less, even smaller fans can be used for testing houses and flats 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 may be able to do 20 or more tests in a day (but don’t tell them how easy we had it in the ‘olden days’).


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 period prior to this. They set about building on the foundations and name that had been created without losing the technically correct yet friendly and helpful approach that ALT’s reputation had been built on, starting by adding UKAS accredited sound testing to ALT’s services.


UKAS accredited sound insulation testing to ALT’s service offering, as well as air testing of smoke shafts, plenums, hospital isolation suites, PassivHaus and existing buildings.

Partnerships formed with trusted experts in their fields to be able to offer the full suite of related services, including thermography, acoustic consultancy, energy assessments and more.


The latest Part L is released which will further tighten air testing targets and sees a return to CIBSE TM23 (a new version).

ALT has expanded and developed but the underlying ethos remains the same in that our aim is to support our clients in meeting the requirements whilst playing our small part in improving building performance and reducing carbon emissions.

© Air Leakage Testing Limited 2020

7 Lawson Way, Aylesbury, Buckinghamshire, HP18 0UW

Tel: 01799 540220 – Email: info@airleakagetesting.co.uk

Privacy Policy | Customer Charter

© Air Leakage Testing Limited 2020

7 Lawson Way, Aylesbury, Buckinghamshire, HP18 0UW

Tel: 01799 540220 – Email: info@airleakagetesting.co.uk

Privacy Policy | Customer Charter