If you're weighing up a loft conversion, the first question is almost always the same: what's it actually going to cost? It's a fair question, and one that deserves a straight answer. As builders who have converted lofts across Eastbourne, Meads, Holywell and the wider East Sussex area for decades, we've put together this honest, no-nonsense guide to loft conversion costs in 2026 — including what drives the price up, where you can sensibly save, and how to budget with confidence.
The short answer: typical loft conversion costs in East Sussex
Most loft conversions in East Sussex in 2026 fall somewhere between £28,000 and £85,000, depending on the type of conversion, the size of your roof space and the finish you choose. That's a wide range, so here's how it breaks down by conversion type:
| Conversion type | Typical cost (2026) | Best suited to |
|---|---|---|
| Rooflight (Velux) | £28,000 – £42,000 | Lofts with good existing head height |
| Dormer | £38,000 – £62,000 | Most semis and terraces; adds height & floor space |
| Hip-to-gable | £48,000 – £72,000 | Semi-detached and detached homes with hipped roofs |
| Mansard | £58,000 – £85,000+ | Maximum space; often period and terraced properties |
These figures cover a complete, habitable room — structure, insulation, stairs, electrics, plastering and decoration — not just a boarded-out attic. Adding an en-suite bathroom typically adds £5,000–£10,000 on top, depending on the specification and how far the new pipework has to run.
What each type of conversion involves
Rooflight (Velux) conversions — from £28,000
The simplest and most affordable option. The shape of your roof stays exactly as it is; we insulate, board, install roof windows, build the staircase and finish the room. Because there's no structural alteration to the roofline, rooflight conversions are quicker on site and rarely need planning permission. The catch is that you need decent head height to begin with — generally around 2.2 metres or more at the ridge.
Dormer conversions — from £38,000
The most popular choice in East Sussex by some distance. A dormer is a box-shaped extension built out from the slope of the roof, giving you full head height across much more of the floor and space for a proper window. A rear dormer can turn a cramped attic into a generous double bedroom with an en-suite, which is why it's the go-to for growing families in Eastbourne's semis and terraces.
Hip-to-gable conversions — from £48,000
If your roof slopes down at the side (a "hipped" roof, common on 1930s semis), a lot of potential loft space is lost to that slope. A hip-to-gable conversion builds the side wall straight up into a vertical gable, dramatically increasing usable volume. It's often combined with a rear dormer for the best of both worlds.
Mansard conversions — from £58,000
A mansard reshapes the whole rear slope of the roof to near-vertical, with a flat top — effectively adding another storey. It delivers the most space of any conversion type but involves the most structural work, and it almost always needs planning permission. For period terraces where every square metre counts, it's frequently worth it.
The seven factors that really drive the cost
- Existing head height and roof structure. Traditional cut roofs are straightforward to convert. Modern trussed roofs (common from the 1960s onwards) need new structural steels and reinforcement, adding £3,000–£6,000.
- Staircase position. A simple stair stacked above the existing flight is the cheapest route. Re-working the landing or sacrificing part of a bedroom adds joinery and making-good costs.
- Bathrooms and plumbing. An en-suite is the single biggest optional cost. Position it above existing plumbing to keep pipe runs — and prices — down.
- Windows and natural light. Standard roof windows are economical; larger dormer glazing, Juliet balconies and conservation-style rooflights cost more.
- Insulation and building regulations. Every habitable loft must meet current thermal, fire-safety and escape requirements under the UK Building Regulations — this is non-negotiable and is built into every Bear & Fox quote.
- Finish level. Fitted wardrobes in the eaves, hardwood flooring, underfloor heating and high-end sanitaryware all nudge the budget upwards — but eaves storage in particular is money well spent.
- Access and location. Tight terraced streets, conservation areas and limited scaffolding access can all add time on site.
Do you need planning permission?
Usually not. Most loft conversions in East Sussex fall under permitted development rights, which allow up to 40 cubic metres of additional roof space on terraced houses and 50 cubic metres on semi-detached and detached homes — provided the design meets certain conditions on height, materials and window positions. The Planning Portal's loft conversion guide sets out the rules in full.
You will typically need permission for mansards, front-facing dormers, and any conversion in a conservation area — parts of Meads and Eastbourne's town centre included — or on a listed building. Whatever the route, building regulations approval is always required, and your conversion will be inspected and certified. Bodies such as LABC (Local Authority Building Control) publish useful homeowner guidance on what inspectors look for.
Is a loft conversion worth the money?
In most cases, emphatically yes. A well-designed loft conversion is consistently cited by surveyors and estate agents as one of the highest-value home improvements you can make, with industry research over the years suggesting an added value of up to around 20% for a double bedroom with en-suite. In a market like Eastbourne — where moving to a bigger house means stamp duty, agent fees, legal costs and removal vans — converting the space you already own is often the smarter financial move.
And value isn't only about resale. An extra bedroom, a quiet home office above the noise of the house, or a teenager's retreat changes how your home works every single day.
How long does a loft conversion take?
As a rule of thumb: a rooflight conversion takes around 4–6 weeks on site, a dormer 6–8 weeks, and a hip-to-gable or mansard 8–12 weeks. Most of the structural work happens through the roof from scaffolding, so disruption inside your home is far less than people expect — families almost never need to move out. We'll give you a stage-by-stage timeline before we start, and we keep you informed throughout.
How to budget sensibly: our advice after 30+ years
- Get an itemised, fixed-price quote — not a day rate or a vague estimate. You should be able to see exactly what's included.
- Hold a 10% contingency. Older roofs occasionally hide surprises. A sensible buffer means a surprise never becomes a crisis.
- Spend on structure and insulation, save on finishes. Paint and flooring can be upgraded later; steels and insulation can't.
- Check your builder is insured and references are real. Trade bodies like the Federation of Master Builders publish good checklists for vetting a contractor. We're fully insured and happy to show you completed local projects.
What should be included in a loft conversion quote?
When you compare quotes, make sure you're comparing like for like. A complete loft conversion quote should include scaffolding, all structural steelwork and timber, roof windows or dormer construction, full insulation to current standards, the new staircase, first and second-fix electrics, plasterboarding and skimming, fire doors and smoke alarms where required, and making good the rooms below where the stairs land. It should also state who is responsible for building regulations fees, structural engineer's calculations and waste removal. If one quote is thousands cheaper than the rest, the difference is almost always hiding in what's been left out — and you'll pay for it later as "extras." Our quotes itemise every one of these elements, so the price you sign is the price you pay.
Frequently asked questions
Can every loft be converted?
Most can, but not all. The key tests are head height (ideally 2.2m+ at the highest point), roof structure and where the stairs can land. A free site visit will tell you in under an hour.
Will I need to move out during the work?
Almost never. The bulk of the work is done through the roof via scaffolding, and we keep the site clean and sealed off from your living space.
Does a loft conversion need building regulations approval?
Yes, always — covering structure, fire safety, insulation, stairs and electrics. We manage the whole approvals and inspection process for you, and you receive a completion certificate at the end.
What's the cheapest way to add a loft bedroom?
A rooflight conversion in a loft with good existing head height, with the staircase stacked over the existing flight and no en-suite. From around £28,000 in East Sussex.
Ready to find out what your loft could become?
Every roof is different, and the only accurate price is one based on your actual loft. Bear & Fox Construction offers a free, no-pressure site visit anywhere in Eastbourne and East Sussex: we'll measure up, talk through your options honestly — including telling you if a conversion isn't the right move — and follow up with a fixed, itemised quote. Call us on 01323 364462, or explore our loft conversion service to see how we work.