Building Regulation 2021

Building work if—

the building work consists of repairs, maintenance or alterations to an existing building other than—

alterations to existing fencing for a regulated pool; or

repairs, maintenance or alterations to an existing solar hot water system or photovoltaic solar panel attached to the roof of a building; and

the building work—

does not change the building or structure’s floor area or height; and

is for, or only affects, a minor structural component of the building; and

the requirements under subsection (2) are met.

For subsection (1)(c), the requirements are—

if the building work does not affect more than 20% of the building’s structural components of the same type; or

if the building work is carried out on a sole-occupancy unit in the building—the work and other building work of the same type carried out on the unit in the previous 3 years does not affect more than the lesser of—

20% of the unit’s gross floor area; or

40m² of the unit’s floor area; or

if the building consists of storeys and the work is not carried out on a sole-occupancy unit—the work and other building work of the same type carried out on the same storey in the previous 3 years does not affect more than the lesser of—

20% of the storey’s gross floor area; or

40m² of the storey’s floor area.

In this section—building includes structure.gross floor area, of a sole-occupancy unit or storey, means the total area of—

all parts of the unit or storey within its external walls; and

any other roofed part of the unit or storey.Example for paragraph (b)—a roofed balcony

the structural component is—

a roof beam or lintel supporting no more than 5m² of roof area; or

a sun hood or sun blind projecting no more than 1m from the building; or

if the work is repairing or maintaining the structural component—a structural component that, if it was not present in the building, the building’s general safety and structural integrity would not be at risk; orExamples—

if the work is adding the structural component to the building—the addition does not pose a risk to the building’s general safety and structural integrity.