Bungalows have something most Bristol terraces don't: a big footprint under a big roof. Stand in the loft of a 1950s or 1960s bungalow and you can often see a whole floor's worth of space going to waste. A bungalow loft conversion can turn that into two bedrooms and a shower room without touching the garden. It also asks questions a house loft doesn't, starting with where on earth the stairs go.
We're Dan and Craig (Daniel Webster and Craig Cook) of Wilson & Cole Developments. This is how we approach a bungalow roof.
Why bungalows can make the best lofts
- Footprint. The loft covers the whole ground floor, so the usable area can be large.
- Roof shape. Many bungalows have hipped roofs, which can be squared off to gain volume. Gabled ones are often ready to go.
- Cut roofs. Older bungalows often have traditional cut roofs with open space inside. Later ones are more likely to have trusses, which need an engineer's redesign before they can be opened up. Our piece on cut roofs and trusses explains the difference.
The limit is pitch. A shallow roof may not give enough standing height under the ridge, and that decides which option works.
Four ways up: rooflights, dormer, hip-to-gable, raising the roof
| Option | What it involves | Planning | From (plus VAT) |
|---|---|---|---|
| Rooflights (room in roof) | Floor, insulation and Velux-type windows in the existing slopes | Usually permitted development | £35,000 |
| Rear dormer | A box built out from the rear slope for full-height space | Usually permitted development | £40,000 |
| Hip-to-gable | Hipped end built up into a gable, often with a rear dormer | Usually permitted development | £50,000 |
| Raising the roof | New, higher roof structure over the bungalow | Needs planning permission | Priced after a survey |
Which loft suits which roof is covered in more depth in our guide to which loft conversion fits your roof.
Where the stairs go
On a house, the new stair usually sits over the existing one. A bungalow has no existing stair, so the new one has to land somewhere on the ground floor and arrive under the highest part of the roof. That is the biggest design decision in a bungalow loft conversion.
The usual answers are a wide hallway, part of a small bedroom, or a box room given up entirely. So the ground floor gets drawn first, then the loft. Retractable ladders are not normally acceptable for a habitable room, according to the Planning Portal's loft stairs guidance, and the opening needs new timbers around it to carry the joists that are cut. Approved Document K sets the headroom, pitch and step sizes; our loft stairs guide has the numbers, and our loft stairs page shows the options. Staircases are bought in from specialist makers.
Fire safety and escape
Converting a bungalow loft turns the house into a two-storey home, and the fire rules change with it. Under Approved Document B, Volume 1, where an upper storey is no more than 4.5 m above ground and served by one stair, each habitable room needs either:
- an emergency escape window, or
- direct access to a protected stairway.
An escape window needs an unobstructed opening of at least 0.33 m², at least 450 mm high and 450 mm wide, with the bottom of the opening no more than 1,100 mm above the floor. Rooflights and dormer windows can be designed to meet it. On a two-storey house the loft is higher, and the Planning Portal notes that escape by window from above first floor is too dangerous, which is why house lofts need protected stairs. Bungalows usually avoid that. Mains-powered, interlinked smoke alarms are needed either way.
Structure and insulation
Bungalow ceiling joists were sized to hold up a ceiling, not a bedroom. So a new floor goes in, usually with steel beams, designed by a structural engineer. Calculations usually cost £500 to £1,000. New roof elements are insulated to 0.15 W/m²K under Approved Document L, so a converted bungalow is usually warmer than it was before.
Planning and permitted development
Rooflights, rear dormers and hip-to-gable conversions are usually permitted development if they fit the GOV.UK permitted development rules:
- no more than 50 m³ of extra roof space for a detached or semi-detached bungalow (40 m³ for a terraced one)
- nothing higher than the highest part of the existing roof
- no dormer on a roof slope facing the road at the front
- materials similar in appearance to the existing roof
- not in a conservation area
Raising the ridge goes above the existing roof, so it always needs a householder application (£548 from 1 April 2026). A lawful development certificate (£274) confirms a permitted development scheme in writing. Our article on the 40 and 50 cubic metre limits explains how the volume is measured. On a semi, the Party Wall Act may apply, and the notices are yours to serve as the owner.
Costs: from figures
Our 2026 from-prices, all plus VAT:
- Rooflight (Velux) conversion: from £35,000
- Dormer: from £40,000
- Hip-to-gable: from £50,000
Raising the roof is priced individually after a survey, because it is closer to building a new upper floor. Every quote is detailed and itemised, and the price only changes if you agree the change first. More on what moves the number on our loft conversion cost page.
On disruption: in a bungalow you live directly under the work. Most of it happens from scaffold and through the roof, so the house stays usable. The messy days come when the stair opening is formed. On a job like this we sheet off the rooms, keep a clear route through and clean down at the end of each day. There's more in living at home during a build. Our BS9 garage and attic conversion shows a loft we've finished, and our bungalow loft conversion page covers how we run them.
Frequently asked questions
Can every bungalow have a loft conversion?
Most can, but the roof pitch and structure decide how. A steep cut roof often suits rooflights or a dormer. A shallow roof may need a hip-to-gable or a raised roof to get standing height. Trussed roofs can be converted with an engineer's redesign.
Do I need planning permission for a bungalow loft conversion?
Usually not for rooflights, a rear dormer or a hip-to-gable within the 50 m³ allowance (40 m³ for a terraced bungalow), away from the front slope and outside a conservation area. Raising the roof always needs planning permission.
Do I need fire doors in a bungalow loft conversion?
Usually not the full protected stair a house loft needs, because the new floor is low enough for escape windows. Each loft room needs an escape window or direct access to a protected stair, and mains-powered interlinked smoke alarms are required.
Where do the stairs go in a bungalow loft conversion?
They have to land on the ground floor and arrive under the highest part of the roof. Common answers are a wide hallway, part of a bedroom or a box room. That's why the ground floor layout is designed first, then the loft.
How much does a bungalow loft conversion cost?
Our 2026 from-prices are £35,000 for a rooflight conversion, £40,000 for a dormer and £50,000 for a hip-to-gable, all plus VAT. Raising the roof is priced after a survey. Every quote is detailed and itemised.
Free, no-obligation quote. No pressure. Tell us about your bungalow and we'll come and look at the roof, the stairs and the options.
