Summer APTI Local

Thanks for your Enquiry

Please see below for further information on a diagnostic airtightness test. It’s currently too warm outside making it difficult to achieve a good temperature difference between inside and outside the property – unless you’re prepared to heat the building to a very high temperature.
I will contact you again once external temperatures start to reduce in the Autumn. If you have floor plans, it would be helpful if you could forward these to me in the meantime.

Kind regards,

Diagnostic Airtightness Test
The cost of the diagnostic airtightness test is £350 for appointments within a 50 mile radius of Kendal, £400 for further afield plus travel at HMRC rates in both cases (not subject to VAT – I am not VAT registered). This includes the use of thermography (and smoke if needed) and I would expect to provide the following outputs:

• An approximate air permeability or air change rate for the building – this will allow me to put the “leakiness” of the building in context.
• A library of the thermal images taken as part of the testing – these record the issues identified.
• A discussion on site regarding the issues identified (if the householder / architect are present).

Sometimes, the testing raises a large number of issues – if the whole process takes more than around 4 hours, I would need to charge an additional amount for the extra time (£80ph).

Normally, when I’m doing this sort of test, the householder and / or architect are present and I go through the issues as we see them.
Clients normally make their own notes to keep the cost down, but I can do a report if needed but this would be at an additional charge.

Here is a link to a recent write up in the Financial Times on a test I carried out on a listed property

I have attached some notes describing the process. I would be grateful if you could check through them and let me know if there is anything I need to be aware of. For the testing I am proposing, you will need to ensure the building is heated uniformly to a temperature approx. 10 degrees above outside with the heating on continuously for the 24 hours ahead of the test.