Calculate your loft conversion cost
Loft conversion cost by type in Manchester
The national source benchmarks below are for typical 30m² projects.
UK £22,500–£30,000£21,150–£28,200
UK £40,000–£60,000£37,600–£56,400
UK £50,000–£70,000£47,000–£65,800
UK £50,000–£80,000£47,000–£75,200
What the regional adjustment changes
What can change a real Manchester 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
The postcode-aware calculators use the same North West model and can be adjusted manually when a project sits outside the assumptions.
- Apartment, inner-city and suburban projects can have very different access and building-management requirements.
- Parking, loading and lift or stair access should be priced explicitly where trades cannot work directly from a driveway or front access.
- Major renovation budgets should separate visible finishes from structural, electrical, plumbing and compliance work.
How the regional model works
The 0.94× factor places this planning estimate 6% below the national planning baseline. We keep that modelling assumption separate from the dated national benchmark so users can see 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 Manchester in 2026?
Our modelled Manchester ranges run from about £21,150–£28,200 for a 30m² Velux or rooflight conversion to about £47,000–£75,200 for a 30m² mansard.
How much is a dormer loft conversion in Manchester?
The modelled planning range for a typical 30m² dormer is about £37,600–£56,400, starting from the current national £40,000–£60,000 benchmark.
Why is the Manchester estimate different from the UK benchmark?
The 0.94× North West factor places the model 6% below the national planning baseline. It is a planning assumption, not an observed city-wide contractor 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 increase the final quote.