How much does a roofing felt replacement cost in 2026 (UK)?
In 2026, most UK homeowners can expect a roofing felt replacement to cost between £450 and £2,500+, depending on whether it’s a small shed/garage roof, a flat roof re-felt, or a full underlay upgrade on a pitched roof during re-tiling. Below you’ll find up-to-date pricing, what affects the cost, and how to get accurate quotes from vetted local roofers.
- Typical range: £450–£2,500+
- Average (common jobs): £900–£1,600
- Best time to replace felt: when re-tiling or fixing widespread leaks
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2026 UK roofing felt replacement costs (quick guide)
Costs vary mainly by roof type (flat vs pitched), size (m²), access/scaffolding, and whether the felt is being replaced as a standalone repair or as part of a bigger roofing job (like re-tiling). Use the table below as a realistic starting point for 2026.
| Job | Typical size | Typical 2026 cost | What’s included |
|---|---|---|---|
| Small felt patch repair (flat roof) | Localised area | £150 – £350 | Minor cut-out/patch, seal, call-out |
| Garage/shed felt roof replacement | 10–20 m² | £450 – £1,100 | Strip old felt, new underlay/felt, trims |
| Flat roof re-felt (torch-on / high-performance felt) | 15–30 m² | £900 – £2,500+ | Remove old coverings, new system, edge details |
| Pitched roof felt/underlay replacement (during re-tiling) | 50–80 m² | £1,600 – £4,500+ | Lift tiles/slates, replace underlay & battens, refix tiles |
| New breathable membrane upgrade (full roof) | Typical 3-bed house | £2,500 – £6,500+ | Membrane, battens, ventilation details, labour |
Important: “felt replacement” can mean different things
On a flat roof, the felt is the main waterproof layer. On a pitched roof, the “felt” is usually the underlay/membrane beneath tiles or slates. Replacing pitched-roof felt is often more expensive because tiles must be removed and reinstalled.
Roofing felt cost per m² in 2026
For budgeting, many roofers price felt work by the square metre, then add labour, waste removal, and access. As a broad 2026 guide:
- Flat roof felt supply & fit: typically £60 – £120 per m² (higher for complex details, multiple layers, or premium systems).
- Pitched roof membrane (during re-tiling): often works out around £25 – £60 per m² for the underlay element, but total project cost is dominated by stripping and reinstating tiles, battens, ridges, and scaffolding.
If your quote is far outside these ranges, ask what system is being used, how many layers, and what’s included (scaffold, battens, ventilation upgrades, waste removal, VAT).
What affects the cost of replacing roofing felt?
1) Roof size and complexity
Larger roofs cost more in materials and time. Extra penetrations (skylights, vents, chimneys), valleys, and awkward edges increase labour.
2) Access and scaffolding
Scaffolding can be a major line item on pitched roofs. Simple rear access may reduce cost; restricted access or multiple elevations increases it.
3) Roof type (flat vs pitched)
Flat felt is a finished waterproof system. Pitched “felt” is an underlay—replacement usually requires lifting tiles/slates.
4) Condition of timbers & deck
Rotten boards, damaged decking, or sagging joists need repairs before new felt is installed, increasing cost.
5) Material choice and specification
High-performance torch-on felts, cap sheets, and upgraded edge trims generally cost more than basic mineral felt. On pitched roofs, breathable membranes can be a worthwhile upgrade.
6) Waste removal and skip hire
Stripping old felt and disposing of waste may require a skip. Quotes may include this or list it separately.
Common felt replacement scenarios (and what you’ll likely pay)
Replacing felt on a flat roof (re-felt)
For most homes, a flat roof re-felt includes removing old layers (if needed), checking the deck, fitting underlay and cap sheet, sealing joints, and finishing edges and upstands. Expect around £900–£2,500+ for typical domestic sizes, with higher costs for:
- Multiple layers of old felt to remove
- Rotten decking that needs replacing
- Complex details: parapet walls, skylights, multiple outlets
- Higher access requirements
Replacing felt on a garage or shed roof
This is often the most cost-effective type of felt job. If the timber deck is sound and access is easy, you may be in the £450–£1,100 range. If the roof edges are failing, the roof is sagging, or boards are rotten, costs move up due to carpentry work.
Replacing underlay (felt) on a pitched roof
On a pitched roof, the underlay is there to provide a secondary barrier against wind-driven rain and to channel water to the eaves. If it’s torn, perished, or poorly installed, you may see leaks or damp patches. Because tiles or slates need to be lifted, this work is usually done:
- During a full re-roof or re-tiling project
- When battens have failed
- After storm damage has exposed the underlay
Typical costs often start around £1,600 and can exceed £6,500 depending on roof size, tile type, and scaffold.
Signs your roofing felt needs replacing
- Recurring leaks despite patch repairs
- Visible tears, bubbling, or splitting (flat roofs)
- Felt is brittle, cracked, or lifting at edges
- Water staining in loft near eaves/valleys
- Daylight visible through roof line (underlay failure)
- Persistent damp or mould in the loft
If you’re unsure, a roofer can typically inspect and advise whether a repair is enough or if a replacement is more cost-effective long-term.
Repair vs replacement: what’s better value?
A small repair is usually good value when damage is localised and the felt system is otherwise in good condition. A full replacement becomes better value when:
- The felt is near the end of its lifespan
- There are multiple leak points
- Edges/upstands are failing across the roof
- Underlying timbers or decking need attention
As a rule of thumb, if you’ve paid for several call-outs in a short period, replacing the felt system can reduce repeat costs and disruption.
What should a roofing felt quote include?
To compare like-for-like, ask for a written quote that lists:
- The felt system or membrane type, and number of layers
- Whether old felt is being stripped or overlaid (and why)
- Repairs to decking, battens, fascia/soffit (if required)
- Edge trims, upstands, outlets, and any leadwork interfaces
- Scaffolding or access equipment (if required)
- Waste removal / skip hire
- Timescale and start date
- Guarantee on workmanship and materials
- Whether VAT is included
How to keep costs down (without cutting corners)
- Get 2–3 quotes and compare specifications, not just price.
- Schedule in a quieter period where possible (roofers can be busiest after storms).
- Fix small issues early (minor edge failure can lead to bigger water ingress).
- Choose proven materials for your roof type—cheap felt can cost more if it fails early.
- Bundle work (e.g., replace damaged boards and improve drainage while the roof is open).
FAQs: roofing felt replacement cost (UK, 2026)
How long does roofing felt last?
It depends on the system and installation quality. Basic felt on small outbuildings may last around 10–15 years, while higher-performance torch-on systems can last longer with good detailing and maintenance. Pitched roof underlay can last decades but may fail due to age, tearing, or poor ventilation/installation.
Can you replace felt without replacing tiles?
On a pitched roof, replacing underlay properly typically means lifting tiles/slates. Partial repairs are sometimes possible in limited areas, but full replacement generally involves removing and reinstating the roof covering.
Is it cheaper to overlay new felt on top?
Overlaying can be cheaper short-term on some flat roofs, but it’s not always recommended. Trapped moisture, poor adhesion, or existing defects may cause early failure. A roofer should inspect and advise the best approach.
Do I need scaffolding for felt replacement?
Often yes for pitched roofs and higher flat roofs, especially where safety or access is an issue. Small garage or single-storey flat roofs may be done with ladders/towers, but it depends on height and complexity.
Will a new felt roof stop leaks immediately?
If the leak is caused by felt failure and the roof is detailed correctly (edges, outlets, upstands), a replacement should resolve it. If water ingress is coming from flashing, gutters, or tile defects, those issues must also be addressed.
Get an accurate price for your roof
Every roof is different. The fastest way to find your true cost is to get a few local quotes based on your roof size, access, and the right felt system.