Air Tightness Testing

Welcome to Energy Report, your trusted partner for Air Tightness Testing for both residential and commercial properties.

Why do you need Air Tightness Testing?

– For compliance with Part L of the Building Regulations
– To complete your SAP or SBEM calculations
– To minimise air leakage and cut energy costs
– To improve marketability of properties

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Schedule your Air Tightness Test today. Our experts are here to assist you every step of the way.

Our Air Tightness Testing Service

  • Quick Response Times:
  • We can get your Air Tightness Test booked in quickly.

  • Pre-Test Advice:
  • Our experience carrying out these tests allows us to advise you prior to testing and offer solutions to improve your result.

  • Thorough Inspections:
  • All our inspections are carried out by experienced professionals using state of the art equipment.

  • Expert Recommendations:
  • We will provide personalised recommendations to improve your building’s air tightness.

  • Same-day Re-tests:
  • Should your property fail we are able to offer same-day re-tests- additional fees may be incurred in this situation.

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  • Schedule your Air Tightness Test today. Our experts are here to assist you every step of the way. Click here

What is Air Tightness Testing

Air Tightness Testing (also known as Blower Door Testing) is the method used to measure the total air lost in a building through leaks, often referred to as uncontrolled ventilation or draughts. The test involves fitting a powerful fan to an exterior door frame, closing all windows and doors, shutting trickle vents, and ensuring all extractors/ventilation systems are sealed.

The interior of the building is then either pressurised or depressurised to +/- 50 Pa. This creates a pressure difference between the inside and outside of the building, which we then measure using accurate pressure testing instruments. If the property has an Air Permeability rating over 8m3/h/m2 @ 50pa then the property will fail the test as this represents significant uncontrolled leakage. Your design stage SAP/SBEM calculations will often specify a lower test result (AP50). Please note we require a copy of your design test requirement or design stage SAP/SBEM calculations.

Don’t have your SAP/ SBEM calculations? – We can help here too! As accredited SAP assessors we carry out SAP calculations as well.

Book Now

Schedule your Air Tightness Test today. Our experts are here to assist you every step of the way.

Book Now

Schedule your Air Tightness Test today. Our experts are here to assist you every step of the way.

Trusted Industry Professionals

Join countless satisfied customers who have improved their buildings’ efficiency with our air tightness testing services.

“What a fantastic company – the staff were efficient, helpful and friendly. I could not have asked for a better service. Five stars. Thank you”

“I have nothing but praise and thanks to say about Energy Report. They have been a great help, especially guiding us through changes that we have been wishing to make. Great communication and organisation from Zoe and fantastic informative inspection from Tom. We will be using Energy Report again in the future”

“Extremely professional & helpful service. All staff took time to guide us through quite a complex situation and under a time constraint. Would thoroughly recommend.”

“Swift, professional and with services delivered at market-beating rates; if you need to complete your new-build paperwork around the South Coast, look no further.”

“A very professional service and speedy delivery”


How much does an Air Tightness Test cost?

Our fees for an Air Tightness Test start from £300

What happens if my building fails the test?

If your building fails the test, work will need to be carried out to further seal the building. Our experienced team will be able to offer guidelines on what work will be required and may be able to re-test on the same day- additional fees may be incurred in this situation. If the building fails by a large margin and extensive work is required we will be happy to return at a later date to re-test.

How long does an Air Tightness Test take?

The time it takes to carry out the test depends on the size of the building, its layout, and the build quality. In general, a test on a residential building takes between 30 and 60 minutes. Commercial buildings may take longer due to their size and complexity.

What is the test result to pass an Air Tightness Test?

The target test result is set by your SAP calculations as part of the Part L building regulations compliance and the EPC. Target air test results vary from 5m3/h/m2 down to 3m3/h/m2 but can be as low as 0.5m3/h/m2 for Passive Houses or properties with mechanical ventilation.

Do all new builds require air testing?

Yes, from June 2022 when Part L of the Building Regulations were updated all new build residential properties now require an air test. Some new build commercial properties do not require a test…if you are unsure get in touch and we are happy to advise you.

When should the air tightness test be done?

To ensure the best result the air tightness test should be left as late as possible in the build. Windows and doors should be fitted, and all second fix-plumbing and electricals completed. You may wish to complete flooring after the test in-case improvement works are required to achieve the desired/required test results.


Number of unitsAir Leakage Tests (House)Air Leakage Tests (Flats)

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Schedule your Air Tightness Test today. Our experts are here to assist you every step of the way.

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