Extension and loft costs in Barnet

Mostly interwar semis and detached houses, with Victorian terraces around Finchley and large houses in Hampstead Garden Suburb.

• House extension cost in Barnet

  A single-storey rear extension typically £62,000 to £98,000 all in.

  Expected £80,000

  £62,000£98,000
• Side-return extension cost in Barnet

  A side-return extension typically £46,000 to £75,000 all in.

  Expected £60,000

  £46,000£75,000
• Loft conversion cost in Barnet

  A loft conversion with a rear dormer typically £63,000 to £99,000 all in.

  Expected £81,000

  £63,000£99,000

This report is an informed estimate built from public data about your property and current London build costs. It is not a survey, a quote, a valuation or planning advice. Always get written quotes and, where noted, professional advice before committing to work.