Housing stock in Harrow
1930s Metroland semis and detached, larger Arts & Crafts in Pinner.
Planning in Harrow
Pinner and Harrow-on-the-Hill conservation areas add design review. Elsewhere Harrow is a very PD-friendly borough.
Party Wall Act — what to expect
Semi-detached: one party wall neighbour typical.
Read the Party Wall etc. Act 1996 guide for full detail on notices, timelines and surveyor costs.
Typical costs in Harrow
For a mid-spec 25 m² rear dormer loft conversion, all-in (structural design, building control, party wall, VAT and 12% contingency), expect roughly £90,000 to £145,000. 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.
Our calculator applies a 0.97× multiplier automatically for Harrow projects. Get an itemised breakdown in 60 seconds.
Get your Harrow estimateAreas we cover in Harrow
Why homeowners in Harrow pick us
- KYB-verified builders only
- Local Harrow project experience
- Fixed, itemised written quotes
- Full insurance & warranty checks