Independent UK planning guide
Cellar conversion costs in the UK
Upgrade a basement with moisture control, ventilation, safe access and habitable finishes.
Get site-specific quotesTypical UK range
£35,000–£90,000
Straightforward jobs
From £25,000
Typical site time
8–16 weeks
Build the allowance
How to read this price
Starting allowance
For a straightforward, accessible job with a standard specification.
From £25,000
Typical UK project
An early planning range before a tradesperson inspects the property.
£35,000–£90,000
Likely programme
Site time varies with preparation, sequencing, approvals and drying periods.
8–16 weeks
These figures are early UK planning allowances. They are not a substitute for an itemised quotation after inspection.
Control the variables
What can change the quote?
Structural strengthening and openings
Planning and Building Regulations
Insulation, fire safety and escape
Bathrooms, stairs and service extensions
Before accepting a quote
Ask for these details in writing
- ✓Labour, materials and VAT
- ✓Preparation and protection
- ✓Access equipment and waste
- ✓Named provisional allowances
- ✓Testing and certification
- ✓Programme and payment stages
- ✓Making good and decoration
- ✓Warranty and snagging process