Felt
Layers of bitumen felt, still on a lot of older garages and dormers. Small blisters and splits often patch well.
Cheapest to lay but the shortest-lived, about 15 to 20 years.
Flat Roof Repairs in Barnsley
Flat roof repairs in Barnsley for garages, dormers and extensions. Checkatrade's Barnsley figures put a flat roof repair at £471 to £1,400. A local roofer rings to say whether yours can be patched or needs re-covering.
Compare felt, rubber and GRP- Choose your problemGo for the nearest match. The roofer asks the rest when they phone, such as where the damp shows.
- A roofer rings youThey check your postcode is on their patch, hear about the roof and suggest when they could look.
- You agree the price firstWork only goes ahead once you accept the roofer's price. Say no and there is nothing to pay.
Felt, EPDM and GRP compared
EPDM rubber
One rubber sheet with hardly any joins. A tear can take a bonded patch.
Dearer than felt to lay, and a well-fitted sheet can last 30 to 50 years.
GRP fibreglass
Glass-reinforced plastic: resin and glass fibre laid in one seamless coat that sets hard.
It has to go down in dry weather and can last up to about 30 years.
Garage and dormer roofs
Most leaks start where the flat roof meets a wall or the main roof, or at the edge where water runs off. A roof with too little fall holds puddles, and standing water wears the covering out sooner.
Repair or replace
A single split, a lifted edge or one open seam is usually a repair. Cracking all over, a soft deck underfoot or leaks in several places mean a new covering is the better spend.
Lifespans
A cost guide updated in 2026 gives felt 15 to 20 years, rubber 30 to 50 and GRP up to 30. Ponding, people walking on it and poor edge trims all shorten that.
Questions people ask
How long does a flat roof last?
Between about 15 and 50 years depending on the material and how well it was laid. Felt sits at the bottom of that range and a good rubber roof near the top.
Cost per m² in Barnsley?
Checkatrade's Barnsley figures, read on 25 October 2026, give £94 to £135 per m² for bitumen felt, £116 to £167 for EPDM and £123 to £177 for GRP. Your own quote follows a measure-up.
Can you go over an old felt roof?
Sometimes, if the deck beneath is dry and sound. If the boards are soft or wet, the old layers come off first. The roofer checks before pricing either way.
Flat roof leaking or ponding?
Ring the number below or fill in the form, and a roofer who works your side of Barnsley phones you to talk it through.
01226 664477