Step 1 of 3

What kind of
roof is it?

This decides the conversion type before anything else does, and it is usually visible from the street.

Roof type

Gable ends, flat sidesThe straightforward case. A rear dormer usually does it. Hipped, sloping on all sidesHip-to-gable first, which buys the volume back. Mansard or already convertedDifferent rules, and worth a conversation before anything else. Genuinely not sureCompletely fine. We will tell you in the first ten minutes.

Next Not now

Permitted development allows 40 cubic metres of additional roof volume on a terrace and 50 on a semi or detached. This is a demonstration form and nothing is sent anywhere.