Bungalow Loft Conversion Cost UK (2026): Prices by Type

How much does it cost to convert a bungalow loft?

Bungalows have a big advantage for a loft conversion: the roof covers the whole footprint of the home, so the potential floor area is often larger than in a two-storey house. Converting a bungalow loft can turn a two-bedroom bungalow into a four-bedroom chalet-style home without losing any garden.

The catch is that many bungalows – especially those built from the 1960s onwards – have shallow roof pitches and trussed rafters, so creating headroom usually means substantial dormers, new steelwork or even raising the roof. That is why bungalow conversions cost more on average than a typical semi. Published 2026 figures:

• HomeOwners Alliance (July 2026, Checkatrade data): average £75,000 for a bungalow, compared with £50,000 for a semi-detached house.
• BestBuilders (August 2026): £45,000–£85,000 for most homes, from about £30,000 for rooflights to £100,000+ for a full chalet conversion.
• MyJobQuote (October 2026): average about £45,000, with a 40m² dormer at £30,000–£60,000 (builders’ prices, excluding some fees).

Bungalow loft conversion cost by type

Conversion type	Typical 2026 cost	When it works
Rooflight / Velux	£30,000 – £45,000	Steep roofs with good existing headroom
Rear dormer	£50,000 – £80,000	Most bungalows; adds headroom across the back
Hip to gable (with dormer)	£55,000 – £85,000	Hipped-roof bungalows needing more floor area
Full chalet (front and rear dormers)	£75,000 – £100,000+	Creating two or three bedrooms and a bathroom
Roof raise / roof lift	£55,000 – £90,000 (build only)	Shallow roofs where there is not enough height

Dormer bungalow conversion

A rear dormer is the most common way of converting a bungalow loft. It creates vertical walls and a flat ceiling along the back of the roof, giving usable headroom for bedrooms and a bathroom. On a wide bungalow, a long rear dormer can create two bedrooms and a shower room. Our calculator uses dormer rates for bungalows, so you can model your own size.

Chalet bungalow conversion

A chalet bungalow has rooms in the roof, usually lit by dormers on the front and back. “Chalet bungalow conversion” can mean two things: converting an ordinary bungalow into a chalet with front and rear dormers (£75,000–£100,000+ according to BestBuilders), or upgrading an existing chalet whose small, poorly insulated upstairs rooms need enlarging. For the second, a new full-width rear dormer replacing small original dormers often costs in the normal dormer range, because the stairs and floor already exist – a significant saving.

Bungalow roof raise cost

If your loft is too low even for dormers, the roof can be lifted – either by raising the ridge and steepening the pitch, or by removing the roof entirely and building a new one with a higher wall plate. MyJobQuote’s October 2026 guide puts roof lifts at:

• Partial roof lift: £45,000–£65,000
• Raised ridge with pitch adjustment: £55,000–£75,000
• Full roof replacement: £65,000–£90,000+
• Roof lift combined with dormer: £70,000–£95,000

MyJobQuote notes bungalow roof lifts tend to sit towards the higher end of these ranges, and removing the old roof can add up to £10,000. These are builders’ prices: add design fees, building control, planning and VAT on top. A roof raise almost always needs planning permission.

Bungalow loft conversion cost by size

Usable floor area	Typical layout	Estimated total cost (standard finish)
25m²	One double bedroom	£39,000 – £59,500
30m²	Double bedroom with shower room	£46,500 – £70,500
40m²	Two bedrooms	£61,500 – £92,500
50m²	Two bedrooms and a bathroom	£76,000 – £114,000
60m²	Three bedrooms and a bathroom (large chalet)	£91,000 – £136,000

Cost per m² and by finish

Finish level	Build cost per m² (ex VAT)	40m² all-in (Midlands)
Basic	£1,090 – £1,520	£55,000 – £81,000
Standard	£1,220 – £1,740	£61,500 – £92,500
High-end	£1,520 – £2,090	£76,000 – £110,000

Because bungalow lofts tend to be bigger, fixed costs such as the staircase and fees are spread over more floor area, so the cost per m² can be slightly lower than on a small terrace – even though the total is higher.

Bungalow loft conversion costs by region

Region	40m² dormer conversion, all-in
London	£77,500 – £116,500
South East	£70,000 – £105,000
South West & East of England	£65,000 – £97,500
Midlands	£61,500 – £92,500
North of England & Wales	£57,500 – £87,000
Scotland & Northern Ireland	£60,000 – £90,500

Cost breakdown

Cost item	Typical cost	Notes
Building work	£1,090 – £2,090 per m² ex VAT	Dormers, steels, new floor, stairs, insulation, electrics, plastering
Design and drawings	4–7% of build cost	Measured survey plus planning or LDC and building regulations drawings
Structural engineer	£500 – £2,500	Bungalows often need new floor joists across wide spans
Building control	£600 – £1,200	Always required
Lawful development certificate / planning	£274 / £548	England fees from 1 April 2026
Party wall surveyor	£1,000 – £3,000 per neighbour	Semi-detached bungalows only
Staircase	£1,000 – £1,500 basic; £3,000 – £10,000 bespoke	MyJobQuote material ranges
Bathroom	£4,500 – £6,000	MyJobQuote; more for a larger family bathroom
VAT and contingency	20% VAT; 10% contingency	VAT not charged on the planning fee

What affects the cost of converting a bungalow loft?

Roof pitch and headroom

You need about 2.2m from the top of the ceiling joists to the ridge for a straightforward conversion. Many post-war bungalows fall short, which forces larger dormers or a roof raise – the biggest single cost jump.

Where the stairs go

In a house, the new stair sits over the existing one. A bungalow has no staircase, so you need space on the ground floor – often by giving up a small bedroom, part of a hallway or a store. Rearranging the ground floor adds cost.

Floor structure

Bungalow ceiling joists are not designed to be a floor. New, deeper joists (often with steel beams) are needed, and wide spans across a bungalow can mean more steel than in a narrow terrace.

Fire safety

Because the new floor is usually no more than 4.5m above ground, fire-safety arrangements can be simpler than for a third storey in a house – typically interlinked smoke alarms plus an escape window in each habitable room or a protected stair. Your building control body will confirm what applies.

Planning permission for a bungalow loft conversion

Bungalows have the same loft permitted development rights as houses in England: up to 50m³ of extra roof volume for detached and semi-detached bungalows (40m³ for terraced). Rear dormers and rooflights usually qualify. You will need planning permission if:

• you add dormers to a front roof slope facing a road (the usual “chalet” look);
• the extra volume exceeds 50m³ – easy to do on a large bungalow;
• you raise the ridge or roof height;
• the bungalow is in a conservation area, National Park, National Landscape or World Heritage Site, or rights have been removed by condition or an Article 4 direction.

Separately, some houses (including bungalows) built between 1 July 1948 and 28 October 2018 may be able to add a storey through the prior approval route (Class AA), which has its own conditions – check with your council. Many estate bungalows also had permitted development rights removed when built, so check your planning history first. A householder application costs £548; a lawful development certificate £274. Read our loft conversion planning permission guide for full details.

How long does it take?

1. Survey and design: 2–6 weeks.
2. Approvals: BestBuilders suggests allowing 4–8 weeks for survey, structural drawings and planning or an LDC; a planning decision normally takes 8 weeks.
3. Build: about 4–6 weeks for rooflights, 6–10 weeks for a dormer or hip to gable, and 10–14 weeks for a full chalet conversion (BestBuilders). Roof raises take longer, as the home is exposed while the roof is rebuilt.
4. Sign-off: 1–2 weeks.

How to save money

• Stay within permitted development with rear dormers and front rooflights rather than front dormers.
• Avoid a roof raise if possible – a deeper rear dormer is usually far cheaper.
• Plan the stair position carefully so you lose as little ground-floor space as possible.
• Put the bathroom above the existing kitchen or bathroom to shorten waste runs.
• Get three itemised quotes from loft specialists with bungalow experience.

Does a bungalow loft conversion add value?

Bungalows are in high demand from downsizers, so think carefully: adding bedrooms upstairs can widen your market to families, but some buyers specifically want single-level living. Nationwide research cited by Which? suggests a loft conversion adding a bedroom and bathroom can raise value by up to 24%. Keeping a bedroom and bathroom on the ground floor gives you the best of both. If you are weighing up building out instead of up, see our single storey extension cost guide, or compare all loft types in our loft conversion cost guide.

Bungalow loft conversion FAQs

How much does a bungalow loft conversion cost?

Most cost £45,000–£85,000, with an average of about £75,000 according to the HomeOwners Alliance. Our calculator puts a 40m² standard-finish dormer conversion at £61,500–£92,500 including fees and VAT in the Midlands.

Is it cheaper to extend a bungalow up or out?

It depends on the roof. If the loft has good headroom, converting it is usually cheaper per m² than a ground-floor extension and keeps the garden. If the roof must be raised, a single storey extension can be cheaper.

How much does it cost to raise a bungalow roof?

MyJobQuote puts roof lifts at £55,000–£90,000 for the build, with bungalows towards the higher end. Add design fees, planning, building control and VAT.

Do I need planning permission to convert my bungalow loft?

Not always. Rear dormers and rooflights within 50m³ are usually permitted development. Front dormers, roof raises and larger volumes need planning permission.

Is my bungalow loft suitable for conversion?

Measure from the top of the ceiling joists to the underside of the ridge: about 2.2m or more is a good start. Check for trussed rafters, where a staircase could go and whether permitted development rights still apply.

How long does a chalet bungalow conversion take?

Around 10–14 weeks on site for a full chalet conversion with front and rear dormers, plus 2–3 months beforehand for design and planning.

Related guides: Loft conversion cost calculator · Loft conversion finance

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