Cost to Re-Felt Roof UK 2025
Calculate the cost to replace roof felt on sheds, garages, or extensions.
Updated January 2025 • British Prices
💡 2025 Re-Felt Cost Guide
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Cost Breakdown
📋 What's Included
- • Stripping of old felt (if required)
- • Preparation and any minor repairs
- • New felt installation to manufacturer spec
- • Professional edges and trims
- • Typical warranty: 10-25 years depending on system
Roof Felt Types Compared
| Type | Cost/m² | Lifespan | Best For | Rating |
|---|---|---|---|---|
| Standard 3-Layer Felt | £15-25 | 10-15 yrs | Sheds, budget | ⭐⭐⭐ |
| Torch-On SBS Felt | £25-40 | 15-25 yrs | Garages, extensions | ⭐⭐⭐⭐ |
| APP Modified Bitumen | £30-45 | 20-30 yrs | Commercial, durability | ⭐⭐⭐⭐ |
| GRP Fibreglass | £45-65 | 25-40 yrs | Flat roofs, walkable | ⭐⭐⭐⭐⭐ |
| EPDM Rubber | £40-55 | 30-50 yrs | Large areas, eco | ⭐⭐⭐⭐⭐ |
Frequently Asked Questions
How often should roof felt be replaced?
Traditional felt typically lasts 10-15 years. Modern torch-on and GRP systems can last 25-40 years with proper installation.
Can you felt over existing felt?
Sometimes yes, if the existing felt is sound and the deck is solid. However, stripping to the boards is often recommended for best results.
Is GRP better than torch-on felt?
GRP (fibreglass) is more durable and completely seamless, but costs more. For extensions and walkable areas, GRP is usually worth the investment.
How long does re-felting take?
A typical shed or garage roof takes 1 day. Larger extension roofs may take 2-3 days depending on preparation needed.
What warranty should I expect?
Standard felt: 10 years. Torch-on: 15-20 years. GRP/EPDM: 20-25 years. Always get the warranty in writing.