Extension and loft costs in Westminster

Mostly Georgian and Victorian terraces and mansion blocks, many divided into flats, with mews houses and smaller terraces around Maida Vale and Pimlico.

• House extension cost in Westminster

  A single-storey rear extension typically £71,000 to £111,000 all in.

  Expected £91,000

  £71,000£111,000
• Side-return extension cost in Westminster

  A side-return extension typically £52,000 to £85,000 all in.

  Expected £68,000

  £52,000£85,000
• Loft conversion cost in Westminster

  A loft conversion with a rear dormer typically £72,000 to £113,000 all in.

  Expected £93,000

  £72,000£113,000

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.