Thanks for your enquiry regarding a diagnostic airtightness test.
Please find further info below.
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 https://www.ft.com/content/3c596d19-1d79-4584-900d-1ec6945c9cf1
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.