Ely Roofers installs and repairs flat roofs in Fordham, and we know that price is one of the first questions homeowners need answered before they can plan the work.
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Ask three roofers to quote a flat roof and you can end up with three quite different figures. That is not always down to one roofer overcharging or another cutting corners - sometimes the difference reflects genuinely different assessments of what the job needs. Understanding what drives the cost up or down helps you compare quotes properly and avoid both overpaying and under-specifying.
We cover Fordham and the surrounding area from our base in Ely, carrying out flat roof installations and repairs on extensions, garages and outbuildings.
Flat roofing is almost always priced per square metre, so the area of the roof is the primary driver of cost. A small garage roof of 15 to 20 square metres will cost significantly less than a large rear extension roof of 40 to 50 square metres, simply because there is more material and more labour involved.
Flat roof replacement in the Ely area typically costs between £70 and £120 per square metre for a torch-on felt system, and between £90 and £150 per square metre for an EPDM rubber membrane. These figures assume a reasonably straightforward job with decent access and a deck in usable condition. A 20 square metre garage roof at mid-range felt pricing would come out at around £1,700 to £2,400. The same roof in EPDM might run to £2,000 to £3,000.
The two main domestic flat roofing materials are torch-on felt and EPDM rubber. They are not interchangeable in cost or performance.
Torch-on felt is the more affordable option upfront. It uses bitumen-based layers bonded with a gas torch, and a quality system will typically give a serviceable life of 10 to 20 years depending on the grade specified and the quality of installation. It is a familiar, well-understood material.
EPDM rubber costs more at the outset but has a significantly longer lifespan. Manufacturers quote 50 years for the material; real-world domestic performance more typically sits in the 30 to 40 year range before any intervention is needed. When you factor that across the lifespan of a roof, the cost per year often compares favourably with a cheaper felt system replaced more frequently. For a large extension roof where replacement would be disruptive and costly, EPDM is generally the more considered choice.
The price quoted from the ground assumes the deck underneath is in reasonable condition. When the old membrane is stripped back, the actual state of the timber boarding or plywood is revealed for the first time.
A common situation is that water has been sitting in the deck for a considerable time, softening or rotting sections of the boarding before the membrane above finally fails visibly. If those sections are not replaced, a new membrane laid over them will eventually fail in the same area - and the cost of a second replacement will be higher than dealing with it properly the first time.
Replacing a section of deck adds to the total cost - typically around £30 to £60 per square metre for new plywood, including fixing and any adjusted supports - but it is not optional if the timber is genuinely compromised. A roofer who does not mention deck condition until the work has started, or who does not offer to explain what they found, is worth questioning.
Always ask your roofer: what happens to the price if you find rotten deck boards? A clear answer in advance avoids arguments later.
Access affects both the time a job takes and the equipment needed. A single-storey garage roof that can be reached easily from a short ladder is straightforward. A flat-roofed extension above a two-storey section of the house, or one that requires scaffolding to work safely, will add to the overall cost.
Scaffolding for a typical domestic flat roof usually adds somewhere between £300 and £700 to a job, depending on the extent required. Where access is genuinely difficult without it, it is the correct approach - working safely matters. Some smaller flat roofs can be covered safely using a combination of crawl boards and access equipment without full scaffolding; a roofer should explain their access plan in advance.
The membrane across the main field of a flat roof is only part of the cost. The edges, upstands and flashings are where most of the skilled work and additional materials are concentrated.
Every edge of the roof needs a finished drip trim. Every junction with a wall needs an upstand of at least 150mm, dressed and bonded correctly into the membrane. Where the roof meets brickwork, lead flashing is typically used to seal the joint between the upstand and the wall. Lead is priced by weight - a long run of code 4 or code 5 lead flashing can add meaningfully to the total, and any roofer giving you a price should be transparent about whether lead is included or quoted separately.
Complex roofs with multiple outlets, internal corners, parapet walls or pipe penetrations will cost more than a simple rectangular roof of the same area. Each penetration and each internal corner is a potential weak point and needs careful detailing.
Not every flat roof problem justifies a full replacement. A failed seam, a split upstand or a cracked edge detail can often be repaired at a fraction of the cost of a new roof if the rest of the membrane is in reasonable condition. A targeted repair on a flat roof might cost anywhere from £150 to £600 depending on the extent of the work.
The risk with repeated patching is that each repair addresses one failure point while the rest of an ageing membrane continues to deteriorate. At some point, usually when a third or fourth repair is being discussed, a full replacement becomes the more economical route. A roofer should give you an honest assessment of the overall condition and be clear about whether repair is likely to hold or whether the roof is approaching the end of its life.
When you receive quotes for flat roofing work in Fordham or anywhere nearby, check these points:
A lower quote that excludes any of these items may end up costing more once the hidden additions appear during or after the job.
We cover Fordham and the surrounding area including Ely, Soham, Haddenham, Sutton, Stretham, Wilburton, Witchford, Littleport, Prickwillow, Over and March. Flat roofing on domestic extensions, garages and outbuildings is a core part of what we do across this patch.
If you want a straight, itemised price for a flat roof repair or replacement in Fordham, call Ely Roofers to arrange a proper on-site survey. We will look at the roof, tell you exactly what we find and give you a clear figure for the work needed.
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Call any time. Calls are answered day and night and passed straight to our roofers.
