Bromley, London
Boroughs · South London
Bromley · Outer London

House extensions in Bromley

Detached homes and side access mean Bromley projects often skip the Party Wall Act entirely — a real time and cost win.

Typical all-in (inc VAT)
£100k–£155k
Cost vs London base
On par
Postcodes covered
BR1 · BR2 · BR3 · BR4

Housing stock in Bromley

Detached inter-war homes, larger Edwardian houses, ex-village cottages in Chislehurst.

Hip-to-gableMansard loftRear dormer

Planning in Bromley

Bromley is broadly permissive, but expect scrutiny in the Chislehurst, Bickley and Keston conservation areas.

Party Wall Act — what to expect

Detached stock often removes the Party Wall Act from the critical path.

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

Typical costs in Bromley

For a mid-spec 25 m² rear dormer loft conversion, all-in (structural design, building control, party wall, VAT and 12% contingency), expect roughly £100,000 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 Bromley projects. Get an itemised breakdown in 60 seconds.

Get your Bromley estimate

Areas we cover in Bromley

BR1BR2BR3BR4BR5BR6BR7

Why homeowners in Bromley pick us

  • KYB-verified builders only
  • Local Bromley project experience
  • Fixed, itemised written quotes
  • Full insurance & warranty checks
Call now WhatsApp