Loft conversions are one of the most cost-effective ways to add a bedroom and en-suite to a UK home. In the West Midlands market in 2026, you should expect to pay £35,000–£75,000 for most projects, depending on type and finish.
Velux conversions are the simplest and cheapest, ranging £35,000–£45,000. They keep the existing roof line and add only rooflights — best if you already have generous headroom. Dormer conversions add usable floor area and run £55,000–£75,000. Hip-to-gable conversions on 1930s semis sit around £65,000–£85,000.
Costs are rising slightly with material inflation and Part L upgrades — properly insulated lofts use 50–100mm of rigid insulation between rafters, which is more material than was needed five years ago. Always price like-for-like specs when comparing quotes.