Loft conversions are one of the highest value-adding projects you can undertake on a family home in Birmingham and the wider West Midlands. Here is what a good loft conversion actually costs in 2026, and what drives the price.
Loft conversion types and typical costs
- Rooflight / Velux conversion (existing roof profile, no dormer): £30,000–£50,000
- Dormer loft conversion (rear box dormer): £45,000–£75,000
- Hip-to-gable conversion: £55,000–£85,000
- Mansard conversion (full roof rebuild): £70,000–£110,000
These are typical 2026 prices for the Birmingham and West Midlands market for a well-specified conversion including one bedroom, an en-suite and appropriate stair access.
What’s included in a full loft conversion
- Structural steel beams to support the new floor
- New floor joists and floor deck
- Dormer construction (if applicable) — roof, walls, cladding
- New staircase up from the top floor landing
- Full insulation to current Building Regulations
- Electrics and heating extensions
- Plumbing for en-suite
- Fire safety upgrades to the existing staircase (sometimes fire doors on landings below)
- Windows — rooflights or dormer windows
- Plastering and second fix throughout
- Bathroom fit-out
Do you need planning permission?
Many loft conversions in Birmingham fall under Permitted Development Rights, but there are exceptions:
- Conservation areas usually require full planning permission
- Article 4 directions (common in parts of Birmingham) can remove PD rights
- Dormers to the front of the property normally require planning permission
- Volume limits: 40 m³ for terraces, 50 m³ for semi-detached and detached
How long will a loft conversion take?
Once planning and Building Regs are in place, most loft conversions take 8–12 weeks on site. During that time you can usually stay in the house — noisy work is scheduled around your day.
Value added
A well-designed loft conversion in Birmingham typically adds 15–20% to the value of a family home, and can sometimes add more if it moves you from a 3-bed to a 4-bed property and pushes you into a different buyer bracket.
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