How much does a basement renovation cost?

We've got a cellar that's basically wasted space at the moment, just full of boxes. Dreaming of turning it into a proper usable room, maybe a snug or a gym. What sort of money are we talking per square metre?

Asked by Patrick on 26th Sep 2026
Expert Trade Answers
"Hi

Rough estate depends on the spec you want. A basic design would be from £15k-£20k.

Higher spec would be £20k-£25k"
Answered on 30th Sep 2026 - Member since May 2020 - report
"Converting an existing cellar into a liveable room like a snug or gym typically costs £1,200 to £2,500 per square metre."
Answered on 21st Oct 2026 - Member since Oct 2025 - report
"It depends on the current condition of the cellar and what needs doing, but as a rough guide, you could be looking at around £1,500–£2,500 per square metre for a basic conversion. If it needs tanking, waterproofing, insulation, ventilation or structural work, the cost could be higher. It would be best to have a look at the cellar first to give you a more accurate quote."
Answered on 22nd Oct 2026 - Member since Feb 2025 - report
"All depends what you want in it but you're looking at about £16000 to £19000"
Answered on 26th Sep 2026 - Member since Mar 2026 - report
"1000 to 1300 £ sm.
Need electricity, heting flooring, rendering painting."
Answered on 27th Sep 2026 - Member since Mar 2017 - report
"Anywhere between 150000 and 20000 all depending on what spec and Finnish your are after"
Answered on 27th Sep 2026 - Member since Feb 2026 - report
"Hi, depending on the finish and the condition of the area to begin with it can be between £1250 and £2500 m2.
We’ve done a few of these.

Thanks Carmine"
Answered on 28th Sep 2026 - Member since Mar 2023 - report
"Depending on the size and conditions are now. For example ceiling. Walls.
If you like to use as a gym. Make sure
To build extractor fan in and out .
Unfortunately can't tell you the estimate until seeing it in person or some videos and pics."
Answered on 28th Sep 2026 - Member since Sep 2026 - report
"average cost is going to be anything from £3 k per metre but depends on how far you go down and if the basement needs walls need underpinning"
Answered on 29th Sep 2026 - Member since May 2026 - report
"£2,000- 4000 Per m2 depending on depth required, If ground water is discovered, Depth of excavation and underpinning required."
Answered on 29th Sep 2026 - Member since Sep 2026 - report
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