Three different situations
It helps to distinguish a genuinely exempt building, work that does not require approval, and regulated work that an authorised installer can self-certify. These are not interchangeable descriptions. A certificate from an installer, for example, is evidence of a compliance route, not evidence that the work was exempt. [2] [3]
GOV.UK identifies most ordinary repairs, maintenance and like-for-like replacement as work that does not generally need approval, while noting exceptions including some heating systems, fuel tanks, fuse boxes and glazing. The description of the job matters more than calling it a repair on the quotation. [1]
Check the conditions of the exemption
Planning Portal explains that exemptions are defined by the Building Regulations and differ between categories. Some buildings are wholly exempt; others remain subject to particular energy requirements. A small or temporary building should therefore be checked against the actual exemption conditions, rather than assumed exempt because of its size or intended lifespan. [2]
Prepare a short description showing the building's use, construction, relationship to the main house and proposed services. Ask the building control body to identify which exemption, if any, it considers applicable. Keep that response with the drawings so that later changes can be checked against the same description.
Exempt does not mean permission-free
Planning and building regulations are separate systems. A project can fall outside one approval requirement but still need attention under the other. Likewise, exemption of the building does not automatically settle whether electrical work requires notification or whether gas work must be undertaken by a Gas Safe registered business. [4] [5] [6]
This is particularly important where the project description expands during construction. A simple structure, a serviced room and separate living accommodation should not be treated as identical proposals when seeking advice.
Self-certified work is a different route
Certain installations can be carried out by a member of a government-authorised competent person scheme, with notification and certification through that scheme. Check the installer against the authorised type of work; membership for one activity does not cover every element of a refurbishment. [7]
Before relying on an exemption
Record the complete scope, the basis of the exemption and the treatment of any services. If the use or design changes, obtain a fresh assessment instead of carrying forward the earlier answer. Where no exemption or self-certification route applies, make the appropriate building control application before starting. [8]