Testing Ltd
Air Tightness Testing | Call: 0845 094 9369

About L1 Testing Ltd

L1 Testing

L1 Testing

The company was established in 2007 and primarily services the needs of the construction, developer, builder and self build sector as set out in building regulations document L1A/L2A and in line with BRLI Conservation of Fuel and Power.

L1 Testing Ltd carry out air leakage tests on domestic and commercial properties including the following:

  • Housing
  • Flats/Apartments
  • Student Accommodation
  • Shops/Restaurants
  • Care/ Nursing Homes
  • Offices
  • Cinemas
  • Retail Units

We operate under the Quality Control and Assurance procedures laid out by the Independent Air Tightness Testing Scheme (IATS) and are registered level 3 testers.

The director of L1 Testing Ltd is one of only a handful of test engineers to hold a recognised qualification of testing large, complex buildings.

Understanding the building process is a pre requisite of our Company which enables us to advise on a consultancy basis identifying what the industry needs to do in order to achieve a first time pass.

Due to the above, we have built an enviable reputation with our clients and withhold a client base of satisfied customers.

Our Team

GrahamGraham Profile.

Graham founded the company in 2006 to address the needs of building regulations Part L. With over 30 years of construction sector work and one of the few people in the industry with a qualification to test large buildings, he is well placed as a consultant to the air tightness industry and is able to give advice on the formation of air barriers to buildings and carry out testing with investigative expertise.

Graham has a passion for sailing and has completed over 60,000 of ocean sailing.


Lesley  Lesley Profile11

Lesley is a founding director of the company working tirelessly behind the scenes to ensure the smooth running of all departments. Lesley is a keen sailor and has helmed across the bay of Biscay.




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