New or altered construction

What is a new or altered floor?

Diagram showing a new or altered floor 

What is a new or altered wall?

Means the wall is entirely new; or, the alteration involves new framing members; or the alteration reveals existing framing members in which no insulation exists.

• If the work involves entirely new walls then select ‘Yes’. For altered construction, use the clarification below to determine whether your wall is considered altered construction. 
• If the wall already has insulation under the lining, select 'No'. 
• If you are unsure whether there is any insulation, select Yes or No based on the advice below and the Certificate will not require insulation if you uncover it during construction. 
• External walls and internal walls shared with garage – if removing internal lining (e.g. plasterboard) or external lining (eg weatherboards) to reveal framing, select Yes. 
• If the lining is over new battens, select Yes. You will need to insulate over or between the new battens. If repainting or directly fixing sheeting over the wall or rendering over existing lining, select 'No'. 

What is a new or altered ceiling (with roof above?)

Means the ceiling with roof above means the ceiling with roof above is new; or, the internal and external linings are replaced.

• If the work involves entirely new ceilings with roof above then select 'Yes'.
• For altered construction, use the clarification below to determine whether your wall is considered altered construction. If the ceiling and roof already has insulation under the lining, select 'No'. If the ceiling has insulation and the roof doesn't or vice versa, select Yes and the BASIX Certificate will not require you to insulate where you already have insulation.
• If you are unsure whether there is any insulation, select Yes or No based on the advice below and the Certificate will not require insulation if you uncover it during construction.

Ceiling with roof above

• If work involves only internal ceilings with rooms above select 'No'.
• If only replacing the ceiling lining or only replacing the roof lining (not both), select 'No'.
• If repainting or repairing over existing lining, select 'No'.
• If the ceiling lining (e.g. plasterboard) of a ceiling and the roof lining (e.g. tiles) are being replaced, select, 'Yes'.
• You will be required to insulate the ceiling and roof depending on the colour. 

Diagram showing a new or altered ceiling

New work separated from existing dwelling

If the new work is only a room which can be closed off from the existing dwelling with walls, floors, ceilings, windows, glazed doors or opaque doors select Yes. If the new floor area is less than 15m² and the total glass area (window, glazed door, skylight, glazed roof and polycarbonate roof) is less than 20m², lower glazing and/or shading criteria will be set.

Diagram showing new work separated from existing dwelling