Renovation Budget
UK renovation cost calculator and planning guides.

UK Renovation Cost Calculator

Work out what your renovation will cost before you start. Based on UK industry data, updated for 2026.

Project calculator

Renovation cost guides

Detailed breakdowns of what each type of renovation costs, what affects the price, and how to budget properly.

Loft conversion

Dormer, velux, hip-to-gable. Typical costs £20k-50k.

Extension

Single and double storey. Typical costs £1,400-2,500/sq m.

Bathroom

Suite replacement to full remodel. Typical costs £3k-12k.

Kitchen

Cabinets, worktops, appliances. Typical costs £5k-25k.

How this calculator works

Our cost calculator uses published data from the Royal Institution of Chartered Surveyors (RICS), trade associations, and cost databases used by UK construction professionals. The ranges reflect typical 2026 costs across different regions and specifications.

These are planning estimates, not quotes. Your actual cost depends on:

  • Your location (London costs 20-30% more than most UK regions)
  • Materials chosen (budget tiles vs natural stone)
  • Structural work required (moving walls, new steelwork)
  • Building regulations upgrades (insulation, electrics)
  • Access and site conditions

Always get written quotes from at least 3 tradespeople before starting work.

FAQs

How accurate are online renovation cost calculators?

Online calculators provide planning estimates based on average UK costs. Actual costs vary by location, materials chosen, and tradespeople rates. Always get 3-5 written quotes before committing to any project.

What should I budget for contingency?

Most renovation projects should include a 15-20% contingency buffer for unexpected costs like structural issues, building regulation upgrades, or material price changes.

Do I need planning permission for a loft conversion or extension?

Many loft conversions and single-storey extensions fall under Permitted Development and don't need planning permission. However, you'll always need Building Regulations approval. Check with your local planning authority before starting work.