Flat Roofing in Stockport: Installation, Repairs & Replacement
Flat roof installation, repairs and replacements EPDM rubber, GRP fibreglass and lead systems. We cover Stockport, Bramhall, Cheadle Hulme, Marple and Hazel Grove and all East Cheshire. 10-year guarantee. Free written quotes.
Flat Roof Installation, Repairs & Replacements Across Stockport
We install, repair and replace flat roofs right across Stockport and East Cheshire, from around £100 per square metre, on the rear extensions, garages, dormers and bay windows common across the Heatons and Bramhall, and over in East Cheshire on the roofs of Wilmslow, Poynton, Alderley Edge and Adlington. For dormer-specific repairs, including tiled dormer roofs and vertical tile hanging on the cheeks, see our dormer roof repairs.
If the rest of your roof is also showing its age, it is sometimes worth doing the work together rather than splitting it: see our new roofs and re-roofing page for full pitched roof replacements in slate, tile and stone. For smaller jobs like a single slipped tile or chimney leadwork, see our roof repair service. On extension and kitchen-diner roofs, we also fit and weatherproof roof lanterns and flat roof skylights as part of the flat roof build.
See what we offer at a glanceWhy Flat Roofs Fail. And When Repair Stops Being an Option
A leaking flat roof rarely fails overnight, and the damage spreads faster than on a pitched roof. By the time water is visibly dripping into the room below, the membrane has usually been failing for months, and the cost of ignoring it climbs by the week.
An ageing flat roof is also the sort insurers ask about, whether after storm damage or at renewal on an older property. Our guide to flat roof insurance reports and renewal conditions covers what a claim has to prove and when a formal report is needed.
The Most Common Causes of Flat Roof Failure:
- UV degradation - sunlight breaks down felt surface coatings, robbing them of the flexibility needed to handle thermal movement.
- Splits at upstands and abutments - once these open up, rainwater tracks straight into the deck beneath.
- Standing water - anything pooling for more than 48 hours accelerates every other failure mode at once.
- Poor edge and flashing detailing - responsible for the majority of leaks we investigate.
Warning signs you need attention now
- Active leaks, where water is getting in anywhere, even intermittently
- Ponding or standing water that sits for more than 48 hours after rain
- Blistering or bubbling on the membrane surface
- Visible cracking or splitting in the felt or membrane
- Sagging, dipping, or soft spots, a sign the deck beneath has failed
- Leaks at the perimeter, where the roof meets walls, upstands, or flashings
- Moss, algae, or blocked outlets holding water on the surface
- Damp patches or staining on interior ceilings below the roof
Flat Roofing Services We Carry Out
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Flat Roof Repairs
Not every failing flat roof needs stripping back to the deck. Where the membrane still has life left in it and the problem is localised, a properly executed repair is the honest, cost-effective call, and we'll tell you when that's the case rather than pushing a full replacement you don't need yet. The repairs we carry out most often across Stockport and East Cheshire are splits and cracks at upstands and abutments, lifted or failed edge trims, blistered and bubbled felt, tired laps and seams that have started to lift, and lead flashings that have pulled away from the brickwork. We trace each leak back to its actual source rather than patching the wet patch, because water rarely gets in where it shows up on the ceiling below. Every repair comes with an honest assessment: if the covering is genuinely at the end of its life and a patch is throwing good money after bad, we'll say so and quote a full replacement instead. For pitched roof leaks, slipped tiles, and chimney work, see our dedicated roof repair service. Garage and extension coverings keep us particularly busy over in SK7, so see our page on flat roof repairs in Hazel Grove for what we find on those roofs. -
Flat Roof Replacements
Full strip-and-replace flat roof work on house extensions, garages, outbuildings, and commercial properties across Stockport, the right approach once an existing felt roof has reached the end of its useful life. In most cases, an ageing roof that's been patched two or three times costs more in repeat callouts over five years than a single full replacement would have up front. We install EPDM rubber, GRP fibreglass, and liquid rubber overlays depending on the building and budget, replace any rotten decking, upgrade insulation to current Building Regulation standards, and correctly detail all upstands and edges before signing off. A typical domestic flat roof takes one to two days on site; larger commercial work is programmed around the site so operations can continue where possible. -
Same-Day Leak Stop
Flat Roof Leaking? We Stop It Today.
Call Now 0161 566 7522Call us and we'll make your roof watertight the same day, guaranteed dry while you wait. If the leak returns before the full repair is finished, we come back free of charge. Beyond the immediate weatherproofing we trace the source, scope the proper fix, and quote it honestly: if a repair will hold for the long term, we'll tell you; if the roof is genuinely at the end of its life and a repair is throwing money at a lost cause, we'll tell you that too. Response is usually the same day or first thing the next working day across Stockport, Marple, Hazel Grove, Poynton, and Wilmslow.
For how a call-out works, how to tell if your leak is urgent, and what it costs, see our dedicated emergency roof repairs in Stockport page.
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Garage Roof Replacement
The most common flat roof job we carry out. A large proportion of garages in Stockport, Marple, and Hazel Grove were built in the 1970s and 1980s with single-layer pour-and-roll felt that was expected to last 15–20 years and has now long exceeded its design life. We strip back to the deck, replace any damaged boarding, and install a modern EPDM or GRP system that will last three to four times longer than the original, without the blistering, splitting, and lap failures that define old-felt roofs. For garages used as workshops, gyms, or home offices, we can add rigid insulation under a warm-deck build-up at the same time, turning what was a cold, damp outbuilding into a year-round usable space. Most garage replacements take a single day on site. -
House Extension Flat Roofs
Kitchens, utilities, rear extensions, and the flat sections of loft dormers. New-build extensions and major refurbishments fall under Building Regulations Part L, which sets minimum U-values for thermal performance, meeting that target matters for energy bills as much as for sign-off. We specify warm-deck construction on almost all new extension roofs: rigid insulation board sits above the deck, keeping structural timbers on the warm side of the dew point and eliminating the risk of interstitial condensation. The waterproof layer is chosen to suit the building, EPDM for larger areas with no foot traffic, GRP where complex detailing or a walkable surface is needed. Done properly, a modern extension flat roof will outlast the pitched roof on the house it's attached to. -
Bay Window, Porch and Dormer Roofs
Smaller than a garage roof, but technically the most demanding work in flat roofing. Bays, porches, and dormer cheeks are defined by the quality of their detailing at abutments, upstands, and lead flashings rather than the area of membrane laid, get those junctions wrong and the masonry and internal walls beneath the roof will suffer long before the main covering fails. We dress lead into brickwork courses properly, lap upstands to the correct height rather than the minimum, and use the right combination of membrane and lead for each situation. A bad bay roof damages plaster, window frames, and joinery below it continuously; a good one is invisible for decades.
Flat roof repairs and replacements across Stockport and East Cheshire, in EPDM, GRP and lead. Fully insured, 10-year guarantee.
From £100 per m² See full price breakdown
If a repair will do instead of a replacement, we will tell you straight. No hard sell.
What our customers say
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★★★★★
“This team are organised and helpful. We had a leak in our flat garage roof which appeared to be coming from around a failed coping stone, all repaired and re-sealed without fuss. Now drying out nicely. No cost as under the 10 year guarantee which the company supplies at the installation time. Great work!”
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★★★★★
“Recently had a lead bay window roof replaced plus flashings. Couldn't have asked for more from Daniel and Sean. From start to finish they delivered a professional service, second to none. I would highly recommend them to anyone in need of any roofing or repair issues.”
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★★★★★
“Daniel Scott Roofing replaced a fibreglass roof on the extension of my property. The original roof had been poorly installed by another company. I wish I had contacted Daniel in the first place. He is friendly, courteous, professional and kept me informed of the progress of the job. His staff are also professional, cleaned up as they went along and were on time every day. I would have no hesitation in recommending Daniel Scott Roofing to anyone.”
Accredited & Qualified
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CORC Accredited Member
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CITB Certified
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City & Guilds
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NFRC Competent Person
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NWRTG Member
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NVQ Qualified
Which System Is Right for You?
We install a range of systems. We'll always recommend the right one for your building and budget, not the most expensive.
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100+ Year Life Expectancy
Lead & Copper Flat Roofing
Lead and copper are the traditional choices for the most demanding flat roof situations, bay window tops, porch roofs, dormer cheeks, and complex detail work where every junction has to be dressed precisely into surrounding masonry. Both outlast every modern membrane on the market: lead develops a soft grey patina that suits Stockport's older brick and stone properties, while copper weathers to a distinctive verdigris green that's frequently specified for listed buildings and conservation areas where matching original detailing is a planning condition rather than a preference. Code 4 and Code 5 lead sheet covers most domestic work, with welded seams and rolled joints giving a finish that's effectively permanent; copper is the specialist call where architectural intent or planning consent demands it, and we're one of the few firms in East Cheshire with the lead-smithing and copper-working experience to do either properly. Premium on cost and requires a master craftsman to fit correctly, for heritage properties, conservation areas, and high-end detail work, nothing else lasts as long or sits as right against period materials.
- 100+ year lifespan when correctly installed
- Lead or copper, the right choice for bays, porches and dormer cheeks
- Conservation-area and listed-building approved
- Develops a natural lead patina or copper verdigris that improves with age
- Premium cost; requires specialist lead- and copper-smith installation
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50+ Year Life Expectancy
EPDM Rubber Roofing
EPDM is a single-sheet synthetic rubber membrane that has come to dominate modern flat roofing because it handles the two things that kill felt roofs, UV degradation and thermal movement, better than any other material. It performs best on larger flat areas with low foot traffic, like extensions, garages, and outbuildings. Virtually no seams to fail, UV stable, and flexible across the full range of British temperatures. Mid-range on cost, comparable to a good three-layer felt system. Manufacturer guarantees run up to 20 years on material; installation life is measured in decades beyond that.
- 50+ year installation lifespan when correctly fitted
- Single-piece membrane with virtually no seams to leak
- UV and temperature stable
- Ideal for extensions, garages and outbuildings
- Mid-range cost with long payback
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25–30 Year Life Expectancy
GRP Fibreglass Roofing
GRP (Glass Reinforced Polyester) is laminated in place on site to form a completely seamless, rock-hard finish. It's the right choice for smaller flat roofs, roofs with complex detailing around outlets and upstands, and any area that needs to be walked on regularly: balconies, walkways, and some dormer tops. Because GRP cures chemically, it needs controlled weather to install correctly; we won't lay it in persistent rain or below certain temperatures. Mid to upper range on cost. Manufacturer guarantees run up to 25 years, and the surface remains intact and walkable for the full service life.
- 25–30 year installation lifespan
- Seamless one-piece finish, hand-laminated on site
- Walkable surface that handles regular foot traffic
- Ideal for smaller roofs, balconies, and complex detailing
- Requires controlled weather for correct installation
How Much Does a Flat Roof Cost in Stockport?
Most flat roof installations in Stockport fall between £100 and £190 per square metre for rubber, EPDM, and fibreglass systems, with traditional lead at £300 – £350 per square metre, all supplied and fitted, including stripping the old covering, replacing damaged decking, installing the new system, and detailing all upstands and edges. A typical 15 m² domestic garage roof works out at roughly £1,500 – £2,850 in the common systems, or £4,500 – £5,250 in lead, depending on the system you choose and the condition of the deck beneath.
Typical duration: 1 to 3 days for most extension and garage roofs.
Prices reviewed August 2026.
What Affects the Final Price
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Roof size Larger roofs are cheaper per square metre because fixed costs (scaffold, mobilisation, edge detailing) spread across a bigger area.
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Deck condition Rotten OSB or timber boarding underneath the membrane has to be replaced before the new system goes down.
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Material chosen Liquid overcover is the entry-level option, EPDM rubber and GRP fibreglass sit in the mid-range, and traditional lead is the premium choice.
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Insulation upgrade Warm-deck rigid insulation adds roughly £25 – £40 per m² but meets Building Regulations Part L on full replacements.
| System | Cost per m² (supplied & fitted) | Expected lifespan | Best for |
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| Liquid Rubber Overlay | £100 – £120 | 15 – 20 years | Sound existing roofs, fast re-covers |
| EPDM Rubber | £150 – £170 | 50+ years | Extensions, garages, larger flat areas |
| GRP Fibreglass | £170 – £190 | 25 – 30 years | Balconies, walkable roofs, complex detailing |
| Lead | £300 – £350 | 100+ years | Bays, porches, period and heritage homes |
Prices are indicative for the Stockport area in 2026. We provide a written quote at the visit, no verbal estimates, no costs added once work starts.
No obligation • Same or next-working-day visits across Stockport
Recent Flat Roofing Projects
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Park Lane, Poynton Code 5 Lead Sheet
Lead Bay Window Roof Replacement, Park Lane, Poynton
Period property on Park Lane suffering from persistent water ingress around a failing bay window roof. We stripped back to the timber deck, replaced damaged boarding, and installed Code 5 lead sheet dressed over traditional wood-core rolls, the rolls let the lead expand and contract with temperature instead of splitting at the joints, which is what kills cheaper modern alternatives on a south-facing bay. The right specification for a character home: matches the period detailing of the surrounding stonework and delivers a 60+ year service life with no membrane replacement cycle to plan for.
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Offerton, Stockport GRP Fibreglass with Velux Skylight
GRP Fibreglass Flat Roof and Skylight, Offerton
Rear extension in Offerton with an aging mineral felt covering reaching end of life, plus a new rooflight planned to bring daylight into the kitchen below. We stripped back to the deck, replaced damaged boarding and corrected the falls, then laid a fully-bonded GRP fibreglass system finished with an integrated upstand around a new Velux flat-roof skylight. Fibreglass was the right call over EPDM here, the tight detailing around the rooflight kerb and the foot traffic that comes with future glazing maintenance both favour a hard-wearing, seamless laminate over a single-ply membrane. Walkable, fully sealed, and a 25–30 year service life with the rooflight bonded into the laminate rather than relying on a sealant joint.
Bay Window Lead Roof Replacement: Before & After, Cheadle Hulme
A four-stage record of a recent Cheadle Hulme lead bay window job, from the failed original through stripped-back deck repair to the finished re-lay. The same approach we apply to every period bay where the original 40–60 year-old lead has finally reached end of life.
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Original lead lifting at the front edge after years of thermal movement. Once water tracks behind a split like this, the timber deck below has weeks left. -
Old lead peeled back to reveal a deck rotten beyond patching. Every board needed replacing before any new covering could go down. -
Re-decked, falls re-established, and Code 5 lead dressed over traditional wood-core rolls. The rolls let the lead move with the seasons without splitting again. -
Completed bay roof, dressed neatly into the soffit and flashings. 60+ year service life from this point on, with no membrane replacement cycle.
Our Installation Process
The process below covers full flat roof replacements. For repairs and emergency callouts, we'll advise you on next steps from the initial survey.
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Free Visit and Written Quote
We inspect the existing roof, assess the structure, drainage falls, and any underlying damage. You receive a written quote covering all work, materials, and timescale, no verbal estimates, no additions once we've started.
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Preparation and Strip
The old covering is stripped back to the deck. We inspect the deck and any damaged or rotten boards are replaced before the new system goes on. Getting this stage right is what determines how the finished roof performs.
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Insulation (Warm Deck)
Where the specification includes insulation, which we recommend for all new flat roofs, rigid insulation board is laid over the deck in a warm roof configuration, keeping the structural timbers above the dew point and meeting current Building Regulations Part L requirements.
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Installation
The chosen system (EPDM, GRP, or a liquid rubber overlay) is installed to manufacturer specification. Upstands, abutments, and edge details are given particular attention. This is where most flat roof failures originate and where experience makes the difference.
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Inspection, Handover and Guarantee
We carry out a final check before handover. You receive your written guarantee, and we're available if you have any questions in the weeks after completion.
Flat Roof Work in Conservation Areas and Listed Buildings
Flat roofs on listed buildings require Listed Building Consent even for like-for-like replacement, the listed designation applies to the whole building rather than just its visible elevations, and that includes rear flat-roofed extensions added later. Conservation area controls, by contrast, rarely affect rear flat roofs that are out of public view, but listed building status changes that entirely. If you're unsure which of these applies to your property, we'll advise you as part of the free visit and can specify materials that satisfy planning conditions without compromising long-term weathering.
Learn about heritage & conservation area roofingFrequently asked questions
How much does a flat roof cost in Stockport?
Most flat roof installations in Stockport fall between £100 and £190 per square metre for liquid, EPDM, and fibreglass systems, with traditional lead at £300 – £350 per square metre, all supplied and fitted. A typical 15 m² domestic garage roof works out at roughly £1,500 – £2,850 in the common systems, or £4,500 – £5,250 in lead. A liquid rubber overlay is the budget option (£100 – £120 per m²), EPDM rubber sits in the mid-range (£150 – £170 per m²), GRP fibreglass at the upper end (£170 – £190 per m²), and traditional lead is the premium choice (£300 – £350 per m²). Final price depends on the size of the roof, the condition of the deck underneath, the system chosen, and access. We provide a written quote at the visit, no verbal estimates.
Do you install new flat roofs, or only repair existing ones?
Both. We install brand new flat roofs on extensions, garages, dormers, bay windows and outbuildings, and we repair or fully replace existing flat roofs that have reached the end of their life. A typical domestic flat roof installation takes one to two days on site, depending on the system and the condition of the deck beneath. If your whole pitched roof is due as well, see our new roofs and re-roofing page for slate, tile and stone.
How long does a flat roof last?
A modern EPDM rubber roof, installed correctly, has a realistic service life of 50 years or more. GRP fibreglass lasts 25–30 years, and a liquid rubber overlay typically gives 15–20 years before needing replacement. These are all a world apart from the single-layer pour-and-roll felt used on houses built in the 1970s and 80s, which often failed within 10 years. Lifespan is determined as much by the quality of the install as by the material itself, correctly detailed upstands, properly bonded laps, and a clean deck beneath the membrane are what the manufacturer's warranty assumes.
What is the difference between EPDM rubber and GRP fibreglass roofing?
EPDM is a factory-made sheet of synthetic rubber laid as a single piece, virtually no seams, very flexible, and extremely long-lived on large flat areas. GRP is laminated in place on site with fibreglass matting and resin, seamless, rock-hard, and walkable, which makes it the right choice for balconies, complex upstands, and smaller roofs with lots of detailing. EPDM wins on lifespan and simplicity; GRP wins on foot traffic, detailing, and surface hardness. Neither is strictly "better". They suit different buildings. We'll recommend whichever is right for your roof rather than whichever is in the van.
Why is water pooling on my flat roof?
Ponding happens when the roof deck has insufficient fall, flat roofs need a minimum 1:80 slope to drain reliably, or when the deck has sagged over time because of rotten boarding underneath the membrane. Water that sits on the surface for more than 48 hours accelerates every failure mode at once: UV breakdown, blistering, and membrane fatigue. Correcting ponding usually means tapered firing strips installed over the deck before the new membrane goes down, creating the subtle slope the original roof lacked. In more serious cases, the deck itself needs partial or full replacement.
Do I need building regulations approval for a flat roof replacement?
Replacing more than 25% of the roof's area triggers Building Regulations Part L, which sets minimum U-values for the thermal performance of the roof. For a like-for-like repair under that threshold, approval isn't required. For a full replacement, we include the necessary insulation and provide the written documentation Building Control needs at sign-off. This is handled as part of the job. You won't need to liaise with the council yourself, and we don't treat it as an extra charge line on the quote.
Are your flat roofs guaranteed, and what does the guarantee cover?
Yes, all new flat roof installations come with a written workmanship guarantee from us, and EPDM and GRP systems carry manufacturer material warranties on top. The workmanship guarantee covers everything related to the install itself: membrane bonding, upstand detailing, flashing integration, and the decking underneath. Material warranties cover failure of the membrane itself under normal conditions. You get both documents in writing at handover, along with any Building Regulations sign-off paperwork where applicable.
Areas we cover for Flat Roofing
We carry out flat roofing across Stockport and the surrounding area. Every location below has its own dedicated page. Click through for local detail on the work we carry out there.
Stockport Core
The town centre and inner suburbs, late-Victorian and Edwardian terraces with flat lead-topped bay windows (the slate-pitched ones sit outside our flat roof remit), and 1930s semi-detached homes with single-skin garage roofs in failing pour-and-roll felt. Lead bay rebuilds and EPDM garage replacements are the most common jobs here. Recent work in Offerton has included GRP fibreglass systems on rear extensions with integrated rooflights, where seamless lamination and tight detailing around the rooflight kerb favour GRP over rubber.
South Stockport
A mix of inter-war semi-detached homes through Cheadle and Cheadle Hulme and 1960s/70s detached estates running through Bramhall and Hazel Grove. Most flat roof work here is on rear kitchen extensions, double garages, and dormer cheeks, typically warm-deck EPDM or GRP installed to current Building Regulations Part L.
Marple & East
The stone-built villages east of Stockport, including the Marple Bridge conservation area. Lead bay window roofs and stone-house porches are common here, work that needs proper lead-smithing on Code 4 and Code 5 sheet rather than membrane shortcuts.
Poynton & East Cheshire
Premium properties across the East Cheshire commuter belt. Work here often involves complex detailing, orangery flat roofs, walkable GRP balconies, lead dormer cheeks, and fully insulated warm-deck garages converted to home offices and gyms.
We also cover roofing right across East Cheshire, including roofers in Wilmslow, Alderley Edge, our Handforth page, roofing in Macclesfield, Bollington, roofers out in Adlington, Poynton, roofers in Disley and Knutsford.
Don't see your area listed? We almost certainly still cover it. Get in touch and we'll confirm.
Get a Quote for Flat Roofing
Call, email, or fill in the form. We'll get back to you with a free written quote, usually the same day.
Phone
Address
G6 Hallam Mill, Hallam Street,
Stockport,
SK2 6PT
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Other Services We Offer
We cover the complete range of roofing work, from a single broken tile to a full commercial re-roof.
