Conversion of an existing basement or cellar into habitable space. Covers waterproofing system, drainage, insulation, and internal fit-out to building regulation standards.
Typical cost
£18,000 — £30,000
Typical duration
4-6 weeks
Scope type
flexible
Typical tasks
Install tanking or cavity drain membrane system
Lay sump pump and drainage channel
Install insulated floor build-up
Board and insulate walls
First fix services and prepare for finishing trades
Extras & additional works
Based on a standard 50m² basement conversion, costs may increase if additional structural work or high-end finishes are required.
Common questions Stainesai
The price is affected by the size of the basement, the complexity of the work, the materials used, and any additional features like bathrooms or kitchens.
Planning permission is not usually required for internal basement conversions, but it is needed if you are altering the external appearance of the property. However, Building Regulations approval is required for all basement conversions. Always confirm with your general builder before work begins.
Yes, building regulations apply to ensure structural integrity, fire safety, and adequate ventilation. Approval is required before work begins.
A typical conversion includes tanking or a cavity drain membrane system, drainage installation, insulation, and first fix services for electrics and plumbing.
A standard basement conversion typically takes 4-6 weeks, depending on the complexity and size of the project. Building Regulations approval is required for basement conversions. Always confirm with your general builder before work begins.
Ready to post a basement conversion job?
Describe what you need. Stainesai structures it into a proper scope. Your first job post is free.