Brent, London
Boroughs · West London
Brent · Outer London

House extensions in Brent

Kilburn terraces and Wembley semis both work well as extension projects — Brent is one of the better value North-West boroughs.

Typical all-in (inc VAT)
£95k–£155k
Cost vs London base
On par
Postcodes covered
NW2 · NW6 · NW9 · NW10

Housing stock in Brent

Edwardian and 1930s semis, Victorian terraces in Kilburn and Willesden Green.

Hip-to-gableRear dormerMansard loft

Planning in Brent

Brent is broadly supportive of extensions. Mapesbury and Queen's Park conservation areas require sensitive design.

Party Wall Act — what to expect

Terrace and semi mix.

Read the Party Wall etc. Act 1996 guide for full detail on notices, timelines and surveyor costs.

Typical costs in Brent

For a mid-spec 25 m² rear dormer loft conversion, all-in (structural design, building control, party wall, VAT and 12% contingency), expect roughly £95,000 to £155,000. A mansard, a hip-to-gable with high-spec en-suite joinery or a conservation-area application will push above the top of this range; a self-built rooflight conversion comes in well under the bottom.

Cost tier
Outer London · Baseline vs London average

Our calculator applies a 1.00× multiplier automatically for Brent projects. Get an itemised breakdown in 60 seconds.

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Areas we cover in Brent

NW2NW6NW9NW10HA0HA9

Why homeowners in Brent pick us

  • KYB-verified builders only
  • Local Brent project experience
  • Fixed, itemised written quotes
  • Full insurance & warranty checks
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