Loft conversion cost: what it really costs in 2026
A Qome Snap Guide: quick, honest and no guff. Approximate figures, adjusted to your region inside Qome.
Snap answer
£26,000 – £78,000
A rooflight (Velux) conversion starts around £26,000. A dormer with bedroom and en-suite typically lands between £48,000 and £78,000 depending on size and spec.
Takes6–10 weeksDisruptionMostly overhead, you can usually live in the house throughout
Cost at a glance
Option
Best for
Guide range
Velux / rooflight
Good existing head height, simplest build
£26,000 – £42,000
Hip-to-gable
Semis and end-terraces needing width
£45,000 – £63,000
Dormer
Adding head height and floor space
£48,000 – £78,000
Approximate guide figures, not quotes, Qome adjusts every price to your region.
What actually happens
Survey and structural design, head height and floor strength checked
Scaffolding up; roof opened or dormer framed
New floor structure and steel beams installed
Roof windows or dormer built and made watertight
Insulation, first-fix electrics and plumbing
Staircase fitted and walls plastered
Second fix, doors, decoration and snagging
Price by region
Starting figures by region, the same honest baseline, adjusted for where you live.
London (Inner)from £40,500
London (Outer)from £35,000
South Eastfrom £31,000
East of Englandfrom £28,500
South Westfrom £27,500
Scotland (Highlands)from £24,500
West Midlandsfrom £24,500
North Westfrom £24,000
East Midlandsfrom £24,000
Scotland (Central)from £23,500
Yorkshirefrom £23,500
Walesfrom £23,000
North Eastfrom £22,000
Northern Irelandfrom £21,500
Popular choices
Dormer with Juliet balconyBuilt-in eaves storageEn-suite shower roomVelux with blackout blinds
Rules & regulations
Building regulations always apply, structure, fire escape and insulation are inspected
Most lofts fall under permitted development, but front-facing dormers and conservation areas need planning permission
Terraced or semi-detached? The Party Wall Act usually applies, notify neighbours early
Snap tips
Check head height first: you need roughly 2.2m at the ridge before it's worth pricing
An en-suite adds several thousand but adds the most value per pound spent
Price it properly on Qome
Choose your options and see an honest, region-adjusted estimate, free.