Extension and loft costs in Harrow

Mostly interwar semis and detached houses, with Edwardian terraces around Harrow on the Hill and older cottages in Pinner.

• House extension cost in Harrow

  A single-storey rear extension typically £60,000 to £95,000 all in.

  Expected £78,000

  £60,000£95,000
• Side-return extension cost in Harrow

  A side-return extension typically £45,000 to £73,000 all in.

  Expected £59,000

  £45,000£73,000
• Loft conversion cost in Harrow

  A loft conversion with a rear dormer typically £61,000 to £97,000 all in.

  Expected £79,000

  £61,000£97,000

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.