Lewisham, London
Boroughs · South London
Lewisham · Inner London

House extensions in Lewisham

Excellent value for buy-to-improve. Brockley and Forest Hill terraces respond very well to side-returns without pushing costs into inner-London prime.

Typical all-in (inc VAT)
£105k–£160k
Cost vs London base
+2%
Postcodes covered
SE4 · SE6 · SE8 · SE13

Housing stock in Lewisham

Victorian terraces (Brockley, Hither Green), Edwardian bays (Forest Hill), 1930s semis in Catford.

Side-returnRear extensionLoft

Planning in Lewisham

Generally supportive planning. Brockley and Blackheath conservation areas require higher-spec design and materials.

Party Wall Act — what to expect

Terrace stock: standard two-neighbour Awards.

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

Typical costs in Lewisham

For a mid-spec 25 m² kitchen extension, all-in (professional fees, planning, party wall, VAT and 12% contingency), expect roughly £105,000 to £160,000. High-spec finishes, structural glazing or a full basement dig-out will push above the top of this range; a smaller side-return can come in under the bottom.

Cost tier
Inner London · +2% vs London average

Our calculator applies a 1.02× multiplier automatically for Lewisham projects. Get an itemised breakdown in 60 seconds.

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Areas we cover in Lewisham

SE4SE6SE8SE13SE14SE23SE26

Why homeowners in Lewisham pick us

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