What Drawings Do I Need for a House Extension Planning Application?

What drawings do I need for a house extension planning application? A standard UK householder planning application for an extension requires a location plan (typically Ordnance Survey based at 1:1250 or 1:2500 scale), a site plan (1:500 or 1:200) showing the existing and proposed footprint, and a set of architectural drawings including existing and proposed floor plans, elevations, and a section.

Most local planning authorities also expect a Design and Access Statement for anything beyond the simplest scheme. Roof plans are required where the roof profile changes. Where the site is in a conservation area or near a listed building, additional heritage documentation is typically required, and the local authority may request a CGI or verified view as part of the application. All drawings must show a scale bar, north point, and the red-line boundary. Missing drawings cause the authority to invalidate the application, which restarts the eight-week determination clock.

For the CGI element of your submission, our planning application visualisation service works directly from the architect's drawing pack. We produce photoreal exterior images from agreed viewpoints that complement the technical drawings and help the planning officer understand how the extension relates to its surroundings.

Building regulations drawings are a separate set required after planning permission is granted. These must demonstrate structural compliance under Part A, fire safety under Part B, damp resistance under Part C, and energy efficiency under Part L of the Building Regulations. They are not submitted with the planning application but are needed before construction starts and are typically prepared by the architect or an approved inspector.

For projects involving interior visualisations alongside the planning drawings, VisuArchitect can provide both exterior CGIs for the planning submission and internal renders for client approval at the same time.