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Dormer cost · Detail

3 metre dormer cost

A 3 metre dormer is a popular size for adding space without overwhelming the roof. This guide explains the typical price range and what makes one quote higher than another.
5 min leestijd·Onafhankelijke informatie

Short answer

A 3 metre dormer in the UK typically costs between £8,000 and £15,000 installed, depending on material, glazing, insulation, finish and access. The cheapest quotes often leave out permits, crane, scaffolding or interior finishing.

Price range

These are indicative UK prices for a standard 3 metre dormer with average access. Local labour rates and roof complexity change the figures.

  • Budget — £8,000–£10,000 with basic PVC, standard glazing and minimal interior finish.
  • Mid-range — £10,000–£13,000 with better insulation, HR++ glazing, and a decent interior finish.
  • Premium — £13,000–£18,000+ with timber or composite, triple glazing, high-end finish and full permit handling.

Price drivers

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The full checklist

Checklist

3 metre dormer quote checklist

  1. 01Width is specified as 3 metres internally and externally.
  2. 02Material and frame type are named.
  3. 03Glazing type and U-value are stated.
  4. 04Insulation R-value is included.
  5. 05Scaffolding, crane and transport are included or priced.
  6. 06Permit handling and fees are covered.
  7. 07Interior finish level is described.
  8. 08Warranty terms are attached.

FAQ

FAQ

Veelgestelde vragen

01What does a 3 metre dormer cost?
A typical 3 metre dormer in the UK ranges from roughly £8,000 to £15,000 or more, depending on material, glazing, insulation, finish and access. Always get written quotes for your exact roof.
02Is a 3 metre dormer cheaper than a 4 or 5 metre one?
Usually yes, but not proportionally. A smaller dormer saves on materials and some labour, but the fixed costs of scaffolding, crane, permits and leadwork are similar.
03What is the biggest cost driver for a 3 metre dormer?
Material choice and finish level. PVC with basic finish is at the lower end; timber or composite with high-end insulation and glazing pushes the price up.
04Do I need a crane for a 3 metre dormer?
If it is prefab, usually yes. If it is built on site, a crane may still be needed for materials or may be avoided if access is easy.
Conclusie
A 3 metre dormer is large enough to make a real difference to a room but small enough to keep costs under control. Compare quotes item by item and the right choice becomes clear.