Cost to Convert a Bungalow Loft in 2026 (UK)
Converting a bungalow loft costs roughly £45,000–£85,000 in 2026 for most homes. A simple rooflight conversion where the headroom already exists starts near £30,000, while a full chalet conversion with front and rear dormers can reach £100,000+. Bungalows are well suited to loft conversions — there is no upstairs to work around — but headroom and roof shape decide both what is possible and what it costs. Here is the 2026 breakdown by design route. For the wider picture, see our loft conversion cost guide.
Bungalow loft conversion cost by type — 2026
Finished, standard specification. Source: BestBuilders 2026 quote data · 519 UK towns.
What a bungalow loft conversion costs in 2026
Most bungalow loft conversions land between £45,000 and £85,000 finished. The spread is wide because the price is set by how much of the roof has to be rebuilt to create usable space. A bungalow with generous ridge height can take a light-touch rooflight conversion from around £30,000; a low-pitched roof needs a dormer or a hip-to-gable rebuild to win headroom, and a full chalet conversion with dormers front and rear sits at the top of the range.
Because a bungalow has no first floor to work around, access and structural work are often simpler than in a two-storey house — but the new staircase has to come out of the ground-floor rooms below, which is a design cost worth planning early. For a personalised estimate, use the loft conversion cost calculator.
Cost by conversion type and region
| Conversion type | Typical cost (2026) | Best for |
|---|---|---|
| Rooflight / Velux | £30,000–£45,000 | Bungalows that already have the headroom — keeps the roof shape |
| Dormer | £50,000–£80,000 | Adding headroom and floor space to a standard pitched roof |
| Hip-to-gable | £55,000–£85,000 | Hipped-roof bungalows — builds the sloping end up to a gable wall |
| Full chalet (front & rear dormers) | £75,000–£100,000+ | Maximum space — effectively a new upper floor |
Region then shifts these figures. The typical adjustment applied to any type above:
| Region | Typical adjustment vs UK average |
|---|---|
| London & South-East | +10% to +20% |
| South-West & East of England | Around the UK average |
| Midlands, North & Wales | −5% to −15% |
| Scotland & Northern Ireland | −5% to −10% |
These are the same design routes covered on our dormer and hip-to-gable pages, priced for a single-storey bungalow.
What the price includes — and what it does not
A finished bungalow loft conversion quote normally covers structural design and calculations, the roof alterations or dormer, floor joists and insulation, the staircase, a new room (or rooms) plastered and decorated, electrics, heating and Building Control sign-off. Typically excluded and worth budgeting separately:
- En-suite or bathroom fit-out — add £5,000–£12,000; see the loft en-suite calculator.
- Reworking the room below for the new staircase — the floor space the stairs take has to come from somewhere.
- Upgrading the mains or consumer unit if the existing supply cannot take the extra load.
- Party wall costs where a dormer or gable sits on a shared boundary.
The generic per-type cost breakdown lives on the main loft conversion cost page so the numbers stay consistent across the site.
Will my bungalow loft convert?
Headroom is the deciding factor. Measure from the floor joists to the underside of the ridge: you want roughly 2.2–2.4m of clear height over a useful floor area once the new floor and insulation are in. If you have it, a rooflight conversion is straightforward. If the roof is shallow or hipped, the space is created by building outward or upward:
- Dormer — a box built out from the roof slope to add standing height and floor area.
- Hip-to-gable — the sloping “hipped” end is rebuilt as a vertical gable, common on 1930s–60s bungalows.
- Roof raise / chalet — the most involved: the ridge is lifted or the whole roof rebuilt, usually needing planning permission.
A builder or architect will confirm what your roof allows in a short survey. Compare the options on dormer vs Velux.
How long a bungalow loft conversion takes
- Rooflight conversion — about 4–6 weeks on site.
- Dormer or hip-to-gable — 6–10 weeks, including the roof rebuild and making good.
- Full chalet conversion — 10–14 weeks where the roof is substantially rebuilt.
Add 4–8 weeks beforehand for survey, structural drawings and planning or a Lawful Development Certificate.
Value and durability
A loft conversion is one of the strongest value-adding projects on a bungalow: it adds bedrooms without touching the footprint or the garden, and a well-built conversion typically returns a good share of its cost at resale while making the home far more usable day to day. Structurally it lasts the life of the house — the roof covering (20–40+ years depending on the material) and the dormer’s flat roof are the elements that need attention first. See is a loft conversion worth it? for the value case in detail.
Planning permission and building regulations
Many bungalow loft conversions fall under permitted development, which allows added roof volume within limits (commonly up to 40–50m³ depending on the property type) provided the work is not on a designated area and does not extend beyond the existing roof plane at the front. Dormers facing the road, roof raises and side extensions usually need a full planning application. When in doubt, apply for a Lawful Development Certificate to prove the work is lawful — useful when you sell. See planning permission for a loft conversion.
Building regulations always apply. They govern the floor structure, fire escape and protected staircase, insulation, and the new stairs (Part K). A Building Control inspector signs the work off in stages; where a dormer or gable sits on a boundary, the Party Wall Act may also require notice to a neighbour.
Choosing a loft conversion builder: what to check
- Ask to see two recent bungalow or loft conversions you can visit or phone about.
- Check their public liability insurance yourself and confirm the cover is current.
- Insist on structural calculations from an engineer and a clear Building Control plan.
- Get a written, fixed quote on the same drawings and spec from each builder so they are comparable.
- Agree a stage-payment schedule tied to milestones — never a large sum up front.
Three like-for-like quotes on the same design is the clearest way to judge a fair price. Get 3 free loft conversion quotes.
Calculators and related guides
- Loft conversion cost calculator — a personalised figure in a minute.
- Loft conversion cost guide — every conversion type priced.
- Dormer loft conversion cost
- How to plan a hip-to-gable conversion
- Loft conversions hub — every cost, guide and calculator.
FAQs
Not sure which route suits your roof? Ask a loft conversion expert.
Get 3 Free Bungalow Loft Conversion Quotes
BestBuilders matches you with up to 3 vetted UK loft conversion builders. Compare fixed-price quotes on the same design — free, with no obligation to accept.