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Welcome to Air Tightness Testing (UK) Ltd

Building Air Flow Testing in South & East England

Air Tightness Testing (UK) Ltd is a specialist building air pressure testing firm based in Essex and serving clients across East Anglia, London, the Southeast and all mainland England.

Adhering to Building Regulations ‘Part L’

Minimising or eliminating air leakage is a legal obligation when constructing new domestic properties and other buildings. Building regulations were updated in April 2006, requiring new homes to comply with ‘Part L’. This means that a percentage of new houses need to undergo air tightness testing – also known as air leakage testing or air permeability testing.

What is Air Tightness Testing?

Air tightness testing is a procedure to trace any unwanted drafts and uncontrolled airflow through a house or other building. Too much air leakage leads to heat loss resulting in higher C02 emissions. Reducing C02 emissions is the ultimate purpose of ‘Part L’ of the new building regulations.

Why work with us?

  • If the building fails the first test we will help find and seal up any leaks. Retesting will then take place. No extra charge for same day retests
  • Our engineers are helpful and vastly experienced in the building industry
  • Our fees are highly competitive

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Air Permeability Testing and the Building Regulations

Air infiltration is an issue suffered by all buildings to some extent. Holes, gaps and cracks in a property are the key causes of such air movement, which worsens under adverse weather conditions. As a construction firm or developer, ensuring this air movement – and resulting energy loss – is kept to minimum limits is a legal duty as outlined by the building regulations.

New House Air Tightness Testing

Our services are commonly used by construction firms and developers who must undertake air tightness testing for new houses. Our house air pressure/leak tests can be conducted by our team right across mainland England.

Air Testing: Which Areas Do We Serve?

While we are happy to provide air tightness/permeability testing services across all of mainland England, most of our clients are based in Essex, Kent, Sussex, Bedfordshire, Hertfordshire, Suffolk, Norfolk, Buckinghamshire, Berkshire, London, Oxfordshire, Northamptonshire, and Surrey.

Certified Results Accepted UK-Wide

Our personnel are fully qualified, friendly and helpful. They issue certified results accepted by building control throughout the UK.

iATS Registered and UKAS Recognised


We are registered with iATS (Independent AirTightness Testing Scheme) and use equipment calibrated by UKAS laboratories. Our testing procedures are also recognised by UKAS.