Roofing Cost Calculator
Estimate roofing costs based on roof size, material type, and complexity. Compare prices for tiles, slate, flat roofing, and full replacements.
Last updated: March 2026
Total Cost
£$16,300
Cost per Sq Ft
£$16.30
Labour Days
7 days
Material Cost
£$5,500
How You Compare
Your cost per sq ft is in the bottom 53% of UK roofing.
Industry typical: £12-£25/sq ft
Source: NFRC Industry Data 2025
💡 What This Means
- 📊 £16/sq ft is within the normal UK range of £12-£25. Material choice is the biggest cost driver.
- 💰 A £16300 roofing job is a major investment. Always check your roofer is a member of a trade body (NFRC) and carries adequate insurance.
- 💡 The project will take approximately 7 days. Factor in weather — roof work should ideally be done in dry conditions between April and October.
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What is Roofing Cost?
Roofing cost is the total expense for repairing or replacing a roof, including materials, scaffolding, labour, and disposal of old materials. The roof type (pitched vs flat), material choice (tiles, slate, felt, EPDM rubber), and property size are the main cost drivers. For exterior maintenance planning, also estimate exterior painting costs.
The Formula
Total Cost = Roof Area (sqft) × Cost per Sqft + Scaffolding + Material Type Premium
Scaffolding is typically £800-1,500 for a standard semi-detached house and is required for most roof work. Material premium reflects the difference between concrete tiles (baseline), clay tiles (+30%), and natural slate (+80%).
Worked Example
A 1,200 sqft pitched roof needs re-tiling: £6/sqft for labour and materials, £800 for scaffolding, and a £500 premium for slate tiles.
- Base cost = 1,200 × £6 = £7,200
- Scaffolding = £800
- Slate premium = £500
- Total = £7,200 + £800 + £500 = £8,500
📌 The full roof replacement costs £8,500 — £7.08/sqft all-in. This is mid-range for a slate re-roof of a standard semi-detached house.
Why This Matters
Prevent water damage
A failing roof causes damp, mould, structural timber damage, and ruined insulation. A £8,000 roof replacement prevents £20,000-50,000+ in interior damage from leaks left unaddressed.
Energy efficiency
Modern roofing with proper insulation reduces heating costs by 15-25%. When re-roofing, upgrading insulation at the same time adds only 10-15% to the project cost but saves hundreds annually on energy bills.
Common Mistakes
❌ Patching when replacement is needed
Repeated patch repairs on an old roof (20+ years) are false economy. If patches cost £500-800 each and you need 2-3 per year, replacement becomes cheaper within 3-5 years and provides 30-50 years of protection.
❌ Not checking planning permission
Most like-for-like re-roofing doesn't need planning permission, but changing materials (e.g., tiles to slate) or altering roof height in conservation areas does. Check before starting to avoid enforcement notices and costly reversals.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Tile re-roof | £5,000-7,000 | £7,000-12,000 | £15,000+ |
| Flat roof per sqm | £50-70 | £70-100 | £120+ |
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