Air Testing

Air Testing and the Riba Plan of Work

What is Air Testing?

Air Testing is a requirement of the Building Regulations. Part L states that new developments must meet specific air permeability targets to minimise the risk of heat loss and energy inefficiency caused by air leakage. Stroma Built Environment has the world’s largest team of experienced Level 1 and Level 2 Air Tightness Technicians. Our comprehensive Air Testing services help our clients to determine the development’s air permeability rating so you can meet your carbon reduction and sustainability targets and improve occupier comfort.

Air Testing services – Why choose Stroma Built Environment?

Operating throughout the UK, Stroma Built Environment has delivered Air Tightness Testing on more than 100,000 building types, including dwellings, office buildings, educational establishments, hospitals, superstores, factories and warehouses. We are a UKAS accredited testing laboratory and our on site technicians work closely with architects, project managers, quantity surveyors and design managers to help you take the stress out of air testing.

Our Air Testing services deliver a number of benefits:

UKAS accredited Part L testing

National coverage close to your site

Able to facilitate any type or size of project

Same day handovers

Reduced occupancy time and costs

Founder member of ATTMA

We can help you meet Part L of the Building Regulations and its stringent requirements to reduce CO2 emissions. Part L 2013 currently requires an overall 6% reduction in CO2 emissions and we can help you achieve this through focussed attention on your air barrier strategy and recommendation of a variety of carbon reduction measures.

The importance of Air Permeability Testing

Air Tightness Testing should be undertaken when buildings are virtually complete (usually in RIBA stages 5 and 6) and under calm weather conditions. Depending on the size, complexity and height of the building, either large trailer-mounted fans or smaller electric ‘blower-door-fans’ are used to undertake the air tightness tests. Stroma can design and deliver a bespoke service package combining all, or a combination of our services to facilitate compliance with Part L 2013.

Pre-Test Inspections / Audit

Visits to site throughout construction to ensure effective implementation of the agreed air barrier strategy. All observations are conveyed in a detailed, illustrated report.

Initial Air Tightness Testing

An initial air tightness test is carried out on a sample area to give an indication of how the whole building will perform and the key air leakage issues.

Final Acceptance and Air Leakage Testing

Once the final stages of construction have been finalised and any pre-inspections fulfilled, a final test is required to demonstrate compliance against Part L. The final test includes all necessary building envelope calculations and is carried out using multi-point testing methods to ensure an even pressure distribution, and thus, reliable results. In large complex buildings, this approach, along with our ability to depressurise the building, can be vitally important.

Post-Test Leakage Diagnosis

If a building fails to achieve the required air permeability rating, Stroma’s technicians will carry out smoke testing methods to identify and advise on any remedial works in an illustrated report.

The Importance of Air Permeability Testing


Air Testing Case Studies

Request a quote for Air Tightness Testing

Contact our friendly team to request a quote for Air Testing on your development. You can also select to receive information about our complementary testing and assessment services to allow Stroma Built Environment to provide compliance support throughout your project.

Complementary Services