One fixed price for the whole job — not the hours

Loft Conversion Fair Price

Typical trade: loft conversion specialist / builder. Move the sliders and answer the questions.

Describe the job or snap a photo — AI fills in the sizes

Conversion type
Add an en-suite?

Fair fixed price for the whole job

£56,500

Fair range: £49,720 – £66,670

25 m² dormer loft

Realistic time on site

32.4 days

Crew / total hours

3 · 730.0 h

Labour (730.0 h × £40)
£29,200
Materials
£23,000
Structural engineer & drawings
£1,800
Building control
£900
Scaffolding
£1,600

Over £83,338? Ask why in writing.

  • No structural calculations for steels
  • Fire-escape route (protected stairway) not mentioned
  • Quote excludes stairs

Insist on

  • One written fixed price for the full scope — no open-ended hours.
  • Deposit of 10–20% at most; balance after you inspect the work.
  • Any extra work agreed and priced in writing before it starts.
  • A rear dormer usually takes 6–8 weeks; Velux-only 4–5 weeks.
  • Party wall notices may be needed on terraced/semi houses.

Estimate for an experienced, insured tradesperson. Local prices vary — adjust the hourly rate for your area.

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