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East Midlands
East of England
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Scotland
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Aberdeenshire
Angus
Argyll and Bute
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South East England
South West England
Wales
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Bridgend County
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Cardiff
Carmarthenshire
Ceredigion
City and County of Swansea
Conwy County Borough
Denbighshire
Flintshire
Gwynedd
Isle of Anglesey
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Monmouthshire
Neath Port Talbot
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Torfaen
Vale of Glamorgan
Wrexham
West Midlands
Yorkshire and the Humber
Turning an unused cellar or basement into liveable space is one of the most effective ways to add value to your home. Whether you want a new bedroom, home office, gym or entertainment room, Bark helps you find reliable basement conversion specialists and cellar conversion experts across the UK.
Compare quotes, review previous work and hire a basement conversion company near you that fits your budget and project requirements.
Professional basement conversion companies can transform unused or dark spaces into fully functional rooms. Services typically include:
Structural and preparation work
Waterproofing and insulation
Interior build and finishing
Planning support
Bark research suggests that the cost of a cellar or basement conversion in the UK varies depending on the size of the space, the condition of the existing structure and the level of work required. Most professionals price basement conversions per square metre, which provides a more accurate guide than a single figure.
Simple cellar conversion or renovation
Around £1,000 to £2,200 per m²
(Based on common guidance from UK cost sources such as Checkatrade)
Cellar conversion with structural work
Around £1,500 to £2,500 per m²
(Covers work like floor lowering, underpinning and reinforced waterproofing)
Full basement conversion with excavation and full structural build
Around £2,000 to £3,000 per m²
(Includes excavation, underpinning, drainage systems, waterproofing and complete interior finishing)
Small cellar conversion (approx. 15 m²)
Estimated total cost £15,000 to £33,000
Medium basement conversion (approx. 30 m²)
Estimated total cost £60,000 to £90,000
Based on the mid-range per-square-metre figures commonly cited across UK industry cost guides, a typical cellar or basement conversion usually falls around £1,600 to £2,200 per m².
For many UK homes this results in an approximate overall average project cost of £25,000 to £50,000, depending on property size and condition.
Because every project is unique, requesting quotes from multiple specialists on Bark is the best way to understand the exact cost for your home.
Whether you live in a city centre or a surrounding suburb, you can find cellar and basement conversion specialists in London, Manchester, Birmingham, Glasgow, Liverpool, Edinburgh and many more UK regions.
Bark helps you connect with professionals who understand local building regulations and have experience working with different property types across the UK.
When comparing professionals, consider:
Choosing the right specialist ensures safety, compliance and a finished space that meets your expectations.
Many internal conversions do not require planning permission. Structural changes, digging or property extensions may require approval. Always check local regulations.
A typical conversion takes several weeks to a few months depending on structural work, waterproofing and interior finishing.
Yes. Waterproofing protects the space from damp, mould and water ingress. It is a required part of any professional cellar or basement conversion.
Most conversions add significant value since they increase usable living space. The exact value varies based on size, location and overall finish quality.
4.74/5.00
based on 79,712 reviews
Excellent experience throughout. The survey was thorough, communication was clear, and the work was completed professionally. Highly recommended.
09 Jan 2026
Smart Designs Constructors Ltd provided a smooth and stress-free experience. The team was professional, punctual, and highly detail-oriented. The work was completed on time with an excellent finish, and communication throughout was clear and reliable.
02 Jan 2026
Friendly service, punctual, really happy with the work carried out
19 Dec 2025
