felt lap vents in Greater London (127)

Felt roofing is one of the most cost-effective and versatile solutions for flat roofs, sheds, garages, and extensions.

Its popularity stems from its reliable waterproofing, quick installation, and excellent value for money.

Looking for felt roofing installation in London? Search with Checkatrade to ensure your roof is properly layered, securely fixed, and fully weatherproof.

What is felt roofing?

Felt roofing is a multi-layer flat roofing system made from bitumen felt, fixed and bonded to create a durable, waterproof surface.

It’s commonly installed on sheds, garages, porches, extensions, and other small flat roofs.

Modern felt roofing typically includes:

• A base layer
• A reinforced underlay
• A mineral-finished top layer for UV protection

Signs you may need felt roofing installation or replacement

• Cracks, blisters or splits in your felt roof
• Bald patches where protective minerals have worn away
• Water pooling on the roof surface
• Leaks inside your shed/garage/extension
• Edges lifting or peeling in the wind
• Your roof is older than 10–15 years and has had little maintenance

How much does felt roofing installation cost?

Felt roofing installation costs: Expect to pay between £972 and £2182, with an average cost of £1453.

What affects the cost of felt roofing installation?

• Roof size (sheds vs garages vs extensions)
• Condition of the existing roof deck
• Number of layers needed
• Ease of access and roof height
• Local labour rates
• Whether ventilation or insulation upgrades are required

What should be included in your felt roofing quote?

When comparing quotes from felt roofing installers in London, ensure it includes:

• Type, thickness, and brand of felt specified
• Number of layers included
• Preparation or repair work
• Labour costs and installation timescales
• Waste disposal
• Ventilation or insulation allowances (if relevant)
• Warranty on materials and workmanship

A clear, itemised quote helps you compare options and avoid unexpected costs.

Felt roofing vs alternative flat roofing materials

EPDM rubber roofing

• Pros: Long lifespan, low maintenance
• Cons: Higher upfront cost

Fibreglass (GRP)

• Pros: Seamless, very durable
• Cons: Needs dry, stable weather to install

Asphalt roofing

• Pros: Strong and well-established
• Cons: Heavier and more expensive

PVC membranes

• Pros: Fire-resistant and energy efficient
• Cons: Usually pricier than felt

Felt remains the most budget-friendly option, especially for small roofs.

How long does felt roofing installation take?

Most felt roofing installations take 1–2 days, depending on roof size, weather conditions and preparation work.

Shed roofs can often be completed in a few hours.

How long does felt roofing last?

A properly installed felt roof typically lasts 10–20 years, depending on material quality, the number of layers, and ongoing maintenance.

Maintenance for felt roofing

• Clear debris to prevent pooling
• Reseal minor cracks early
• Inspect edges and joints annually
• Remove moss before it spreads

Regular maintenance helps extend the lifespan of your felt roof and prevent leaks.

Common mistakes to avoid with felt roofing installation

• Using only one or two layers instead of three
• Laying felt in wet or cold conditions
• Poor preparation of the roof deck
• Incorrect overlapping of felt layers
• Not sealing edges or flashings properly

Unfortunately, these mistakes often lead to leaks or premature failure.

Tips for hiring a felt roofing installer in your area

Before hiring a felt roofing installer near you:

• Read reviews on Checkatrade
• Check they specialise in flat roofing and felt systems
• Compare several quotes
• Ask what thickness and number of layers they recommend
• Confirm whether any repairs or new boarding are required

For tradespeople committed to quality and a job done right, search for felt roofing installation in London with Checkatrade.