2026 Oxfordshire cost guide

How much does a loft conversion cost in Oxfordshire?

The roof shape, stair position and structural work matter more than the headline floor area. An ensuite, dormer, roof alterations and difficult access can turn a simple conversion into a much larger project.

Illustrative homeowner range

£77,000–£100,000

a 35 m² standard-finish loft conversion, including VAT where charged.

Standard finishOX postcode basis12–21 weeks typical programme

This is a rounded early example from Proper Job pricing model v14, not a quotation or a promise of local availability. Your range should use the actual property, size, scope, access and choices.

Price my loft conversionHow Proper Job works

What moves the price

  • Dormer, hip-to-gable, mansard or rooflight-only design
  • Existing roof structure and the amount of steelwork required
  • The new stair position and alterations to the floor below
  • Ensuite bathroom, windows, insulation and fire-safety upgrades
  • Scaffolding, access, parking and occupied-home logistics

What this example allows for

  • A ballpark-stage allowance for a typical dormer-style domestic conversion
  • Standard finish rather than a premium joinery or bathroom package
  • Typical Oxfordshire regional pricing pressure and contractor margin
  • VAT added for the homeowner-facing example where it is charged

Before you ask builders for quotes

  1. Get the roof and head height checked before assuming the space is viable
  2. Decide whether the new floor includes an ensuite
  3. Confirm the stair, dormer and window design on one drawing set
  4. Make fire doors, alarms, insulation and making-good explicit in every quote

Questions homeowners ask

Is a rooflight conversion always cheaper?

It is often simpler than a dormer or mansard, but viability, stair work, structure and the required finish still decide the real saving.

Does this include an ensuite?

The illustration is a broad conversion allowance. Add the exact bathroom scope and sanitaryware allowance when creating your own guide.

When can a builder quote firmly?

Usually after measured drawings, structural information and the main finish and supply choices are clear.

Use your project, not the example

Add the real size, finish, logistics and likely extras. Your first Proper Job guide is free.

Create my guide price

Other homeowner cost guides

House extension£76,000–£99,000Kitchen renovation£25,000–£33,000Bathroom renovation£12,000–£16,000

Pricing example checked 17 July 2026.