Loft conversion drawings
A loft conversion is the most popular way to add a bedroom without giving up any garden. We've produced drawings for more than 2,000 loft and extension projects since 2008, with a 94% planning approval rate — all for a fixed price, from £1,698 or £94 a month.
Every type of loft conversion
We draw all four main loft conversion types for UK homes:
The most common type: a box-shaped extension to the rear roof slope that adds headroom and usable floor space.
Replace a sloping hipped roof end with a vertical gable wall, a natural fit for semi-detached and end-of-terrace houses.
Reshape the roof slope to near-vertical for the maximum possible space, common on terraced streets.
Two connected dormers over the main roof and the rear addition, well suited to Victorian and Edwardian terraces.
What's included
Depending on the package you choose, your fixed price covers:
Prices start at £1,698, or £94 a month over three instalments with no interest and no credit checks. See our packages page for exactly what each package covers.
See all packages →Permitted development & planning
Most loft conversions don't need a full planning application — they fall under permitted development. In England, a roof enlargement can add up to 40 cubic metres to a terraced house, or 50 cubic metres to a semi-detached or detached house, and Wales allows the same volumes. A few points catch people out:
For the full rules, and what to do when your project falls outside them, see our loft conversion planning permission page.
Building regulations
Every loft conversion needs building regulations approval, and lofts trigger fire-safety rules that extensions don't. In England, once your new floor sits more than 4.5 metres above ground level, Approved Document B expects a protected stairway — an enclosed escape route from the loft down to an outside door, which usually means fire doors on the rooms opening onto the stair. Below that height, an escape window can be acceptable instead. Our building regulations drawings set out how your conversion meets each requirement, so Building Control can sign it off without surprises on site.
Structural calculations
Almost certainly. A loft conversion puts new loads on your house — new floor joists, and usually steel beams to carry the dormer and the cut roof — and Building Control will want calculations to prove it all works. Calculations are included in our Standard and Premium packages, so for most loft projects there's no separate engineer to find. If you only need calculations on their own, we can quote for that too. Not sure where you stand? Read our guide: do I need a structural engineer?
Related services
Planning a rear or side extension alongside your loft? Same fixed-price approach.
The technical drawings Building Control needs before work starts.
Permitted development rules, explained in plain English.
Compare Essentials, Standard and Premium.