Reply To: Costs for large 8m x 3m ground floor extension

[Michael Clarke]

Two years ago I got a fag-packet estimate on a single storey 4x4m extension to 2nd fix. It was £65k. A bog-standard loft conversion seems to be around £80k. I’ve heard a single story rear full width semi-extension now costs in the region of £100k finished, depending on finishes. Hope that gives you a very approximate idea.