Double-storey extension drawings in Croydon

Green Belt and heritage in Croydon

With 25 per cent of the area in the Green Belt, a share of Croydon addresses face the national test for extensions there: they must not be disproportionate to the original building. A two-storey addition that doubles a house will be judged hard, so we work out the volume before the design is fixed.

Historic England lists 180 entries in Croydon, and 15 places are on its Heritage at Risk Register. A listed house needs its own consent. We confirm whether your address sits in the Green Belt, a conservation area or neither, and the route follows from that.

Croydon's decision record

Croydon decided 786 householder applications in its latest published year and granted 86.6 per cent. It decided 94.4 per cent within eight weeks or an agreed extension.

Those numbers cover every kind of householder project and say nothing about your house; we use them for timing, not to predict a result. Domestic gardens make up 32.8 per cent of the borough's land in the Greater London Authority's land-use survey, a borough-wide measure and not a guide to one plot.

Windows, roof and fire design upstairs

The upper floor brings details a single-storey room does not. Upstairs side windows need: Upper-floor side windows obscure-glazed and non-opening below 1.7 m above floor. The roof follows this rule: Roof pitch of a 2+ storey enlargement to match the original house so far as practicable. A new bedroom needs an escape route: Escape window: unobstructed openable area at least 0.33 m², at least 450 mm high and 450 mm wide, bottom of opening no more than 1100 mm above floor.

Energy limits for the new walls, roof and floor come from Approved Document L: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. All of this goes on the drawings, so building control and the builder read the same set.

Price, checking and what you receive

Drawings start at £1,295 with VAT included, fixed before you commit. You receive plans of both floors, elevations, sections and location and block plans, each checked by a second chartered technologist. If the council asks for changes we redraw at no charge until approval. The householder application fee, £548, is paid to the council.

Where the extension fits permitted development the route is a lawful development certificate; otherwise our planning drawings apply.

More drawings in Croydon and next door

The borough overview is at architectural drawings in Croydon. A single floor is a smaller job, so compare rear extension drawings in Croydon, or look at side return extension drawings in Croydon for a terrace. The national rules are on the double-storey extension drawings hub. Nearby: Sutton, Bromley and Merton.