common air leakage paths<\/a> are, but what actually needs to be tested?<\/p>\n\n\n\nPC – So it it varies depending on where it is because it’s all related to building regulations. For England so non-dwellings, they all need to be tested. No exception there if an EPC is needed. There are some exclusions on there, like if it’s a building that’s solely used for example as a place of worship. This is all on the Level 2 course.<\/p>\n\n\n\n
There are examples like if it’s a building of low in energy demand then that does not need an EPC, therefore it doesn’t need an air test or a modular and factory-made buildings where it’s of a configuration that’s had five in situ tests at the factory. So if you’ve got two modules that link together module A and module B. Five sets of those are tested at the factory. Then whenever modulating module B are used in the field. In that configuration, they can use the number that’s been used in the factory, so therefore it doesn’t need a test.<\/p>\n\n\n\n
In terms of dwellings in England, you’ve pretty much got 100% of them that are tested, that’s because of what goes on in the in the SAP assessment and the EPC. And with regard to if a building isn’t tested, it gets a + 2 added to the average score of similar buildings on the same site. So that can mean that the buildings that tested need to get a really, really good figure. For the ones that aren’t tested they still come in based on that +2 penalty. So if you’ve got a building that needs to get a four, then that means all the ones that you test need to get two.<\/p>\n\n\n\n
For Scotland, you’ve got all non-dwellings that need testing. However a sample of 1 in 20 units or part thereof applies to non-domestic buildings when the building warrant consists of multiple units and each unit has a floor area of not more than 150m2<\/p>\n\n\n\n
For dwellings (in Scotland) it is 1 in 20. And it is based on buildings that have got the same construction details. So, for dwellings, flats, high-rise flats and if they’ve got roughly the same construction details, so you could have a massive mansion that has got the same construction details of a small building, and they’re put in the same group.<\/p>\n\n\n\n
Join us next week to read about what buildings need to achieve<\/p>\n","protected":false},"excerpt":{"rendered":"
In this 6-part series, Chris Milsom (CM), Digital Marketing and Membership Coordinator sat down with Paul Carling (PC), Technical Manager<\/p>\n","protected":false},"author":3,"featured_media":2792,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[172],"tags":[174,61,30],"class_list":["post-2791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-attma-faqs","tag-air-testing","tag-airtightness","tag-attma"],"publishpress_future_action":{"enabled":false,"date":"2026-04-20 19:10:40","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/posts\/2791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/comments?post=2791"}],"version-history":[{"count":3,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/posts\/2791\/revisions"}],"predecessor-version":[{"id":2814,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/posts\/2791\/revisions\/2814"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/media\/2792"}],"wp:attachment":[{"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/media?parent=2791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/categories?post=2791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bcta.group\/attma\/wp-json\/wp\/v2\/tags?post=2791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}