Calculate your loft conversion cost
Loft conversion cost by type in Birmingham
The national source benchmarks below are for typical 30m² projects. The Birmingham column applies the same 0.98× regional model to each type.
UK £22,500–£30,000£22,050–£29,400
UK £40,000–£60,000£39,200–£58,800
UK £50,000–£70,000£49,000–£68,600
UK £50,000–£80,000£49,000–£78,400
What the regional adjustment changes
What can change a real Birmingham quote?
- Velux, dormer, hip-to-gable, mansard or shell-only type
- Usable new floor area
- Roof structure and existing head height
- New staircase position and specification
- Structural steel and roof alterations
- Ensuite, electrics, heating and finish level
- Region, access and scaffolding
Local planning considerations
Actual contractor pricing can vary by access, project scale and specification, so compare itemised quotes against the planning range.
- City-centre, inner-urban and suburban projects can have very different access, parking and delivery conditions.
- Separate structural repairs or remedial work from the headline renovation budget when the existing condition is uncertain.
- Ask contractors to identify waste, scaffold, professional fees and approvals so quotes can be compared against the same scope.
How the regional model works
The 0.98× factor places this planning estimate 2% below the national planning baseline. We keep that modelling assumption separate from the dated national benchmark so users can see exactly which part comes from an external source and which part is UK Home Costs modelling.
Sources
Loft Conversion Cost: 2026 UK Price Guide & Breakdown
Published / checked: March 2026
Used for: Loft conversion type benchmarks
Construction output price indices
Published / checked: 13 August 2026
Used for: Construction price trend and update checks
Frequently asked questions
How much does a loft conversion cost in Birmingham in 2026?
Our modelled Birmingham ranges run from about £22,050–£29,400 for a 30m² Velux or rooflight conversion to about £49,000–£78,400 for a 30m² mansard, using current national type benchmarks and the West Midlands regional factor.
How much is a dormer loft conversion in Birmingham?
The modelled Birmingham planning range for a typical 30m² dormer is about £39,200–£58,800. It starts from the current national £40,000–£60,000 benchmark and applies the West Midlands factor.
Why is the Birmingham estimate different from the UK benchmark?
UK Home Costs applies a 0.98× West Midlands planning factor, which places the model 2% below the national planning baseline. The factor is a transparent modelling assumption and not an observed city-wide contractor price index.
What can push a loft conversion above the modelled range?
Staircase changes, structural steel, low head height, complex roof alterations, an ensuite, premium finishes, difficult access and fire-safety work can all increase the final quote.