Garage Conversion Cost Calculator
Plan a UK garage conversion by floor area, garage type, and selected room upgrades.
Market-specific data
Low, typical & high range
Assumptions shown below
Project measure
Project details
Refine the scope
Project options
Your planning estimate
UK estimate · 16 m²
Typical project allowance
£12,000
Low£10,000
High£14,000
This range updates from the project details you enter. It is a planning estimate, not a contractor quote.
Typical cost breakdown
- Base project allowance (16 m²)
- £15,000
- Integral
- -£3,000
Review the methodology below for included work, exclusions, assumptions, and source information.
Understand the range
Methodology, assumptions & sources
How this estimate is calculated
Floor area uses reviewed per-m² conversion rates. Garage type is a transparent calibrated per-m² adjustment; bathroom and kitchen are explicit add-ons only.
This is a planning estimate, not a contractor quote. Actual quotes vary by location, specification, site conditions, labour, and project requirements.
Included assumptions & exclusions
- Structural allowance is a HomeCostNest planning assumption.
- Building Regulations and planning fees are not included.
Data sources & review information
Source reference
Checkatrade Garage Conversion Cost 2026
Source references provide benchmark context. HomeCostNest applies its own calculator structure, ranges, assumptions, and allowances; listing a source does not imply endorsement of HomeCostNest or verification of every calculated price.
No source URL is stored in this calculator's current data record; no link has been inferred or fabricated.
- Review date:
- September 19, 2026
- Dataset:
- 1.0
- Data record status:
- Reviewed internally
Helpful guides
Garage Conversion Cost Guide: Turning a Garage Into Living Space
Plan a garage-to-living-space conversion using current US and UK area, type, and upgrade methodology.
Read planning guide
Garage Conversion vs Loft Conversion Cost: Comparing Two Ways to Add Space
A market-specific cost-planning comparison of garage conversions and loft or attic conversions.
Read planning guide