Technical Booklet K Ventilation·Page 7·64(4)
Application - New dwellings only
Notification of testing and commissioning is required only for newly erected or created dwellings.
Regulation 67(a) shall apply only to a dwelling being newly erected or created.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet K - Ventilation.pdf