Extension and loft costs in Hillingdon

Mostly interwar semis and detached houses on generous plots, plus bungalows, and older cottages in villages such as Harefield.

• House extension cost in Hillingdon

  A single-storey rear extension typically £59,000 to £93,000 all in.

  Expected £76,000

  £59,000£93,000
• Side-return extension cost in Hillingdon

  A side-return extension typically £44,000 to £72,000 all in.

  Expected £58,000

  £44,000£72,000
• Loft conversion cost in Hillingdon

  A loft conversion with a rear dormer typically £60,000 to £95,000 all in.

  Expected £78,000

  £60,000£95,000

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.