Norwich Roofers installs and repairs flat roofs in Bungay, and this page gives you an honest picture of what the work typically costs and the factors that push a price up or down.
If you have had two or three quotes for a flat roof job in Bungay and found the prices differ by hundreds - or thousands - of pounds, you are not alone. Flat roofing quotes vary widely because the scope of what needs doing can be very different from one roof to the next, and because not all quotes are specifying the same materials or the same standard of work.
Understanding the cost drivers helps you compare quotes properly and spot the ones that have left something important out.
Flat roof replacement costs in the UK typically fall in the range of £70 to £120 per square metre for an EPDM rubber system, inclusive of stripping the old surface, supplying and fitting the membrane, and finishing edges and outlets. Felt torch-on systems generally come in lower, at around £50 to £80 per square metre.
To put those figures in context: a standard single garage roof of around 15 square metres might cost £1,000 to £1,800 for a full EPDM replacement including deck repairs, depending on condition. A larger extension roof of 30 to 40 square metres would typically fall in the range of £2,200 to £4,800, again depending on the extent of the work and the system chosen.
These are typical current UK figures based on material and labour costs. The final price for your roof in Bungay will depend on the specific factors described below.
The single biggest driver of cost is simply the size of the roof. Membrane, decking materials, and labour all scale roughly with area. Larger roofs do sometimes attract a slightly lower per-square-metre rate because set-up costs - scaffolding or access equipment, travel, waste disposal - are spread across more work. But in general, double the area means broadly double the price.
Accurate measurement matters. A survey that involves properly measuring the roof - including upstands and edge details - will produce a more reliable quote than one estimated from ground level.
The condition of the structural deck beneath the existing membrane is one of the most significant unknowns in any flat roofing quote. Deck replacement is one of the larger cost items in a flat roof job: new 18mm or 22mm tongue-and-groove OSB adds material cost plus the labour time to cut it, fit it, and fix it correctly to the joists.
A common problem on older roofs is that a slow or intermittent leak has been introducing moisture into the deck for years. The membrane above may look broadly intact to a casual inspection, but the deck beneath is soft, swollen, or delaminated. Full deck replacement can add £20 to £40 per square metre to the base cost, depending on the extent of the damage.
A roofer who surveys properly will flag this as a risk in the written specification. One who quotes on the basis of a quick look from a ladder may leave deck replacement as an unexpected extra once work has started. Always ask how deck condition will be handled and how additional costs will be communicated before work proceeds.
A flat roof that was built without adequate falls - or one that has settled over time and lost its gradient - may need tapered insulation boards to correct the drainage before a new membrane can be laid properly. Tapered insulation adds to both material and labour costs, but it is the correct solution to a drainage problem. Simply laying a new surface over a roof that ponds water shortens the life of the membrane and is not something a roofer should recommend.
The cost of tapered insulation varies with the extent of the falls problem, but as a rough guide it can add £15 to £35 per square metre on top of the base replacement cost. Not every roof needs it - but the survey should identify whether it does.
Traditional three-layer felt is the cheapest option to install but has a realistic lifespan of only 10 to 15 years. EPDM rubber costs more upfront but can remain serviceable for 30 years or more, which typically makes it better value over the life of the roof. The price difference between felt and EPDM on a standard garage roof might be £300 to £600, but replacing a felt roof twice over 30 years costs considerably more than installing EPDM once.
Modified bitumen torch-on felt sits in the middle - more durable than standard felt, cheaper than EPDM, with a lifespan of around 15 to 20 years. It is a reasonable choice when budget is a genuine constraint and a full EPDM system is not achievable at this point.
The perimeter details - edge trims, upstands, termination bars, lead flashings - are a meaningful proportion of the cost on a smaller roof because they are labour-intensive regardless of roof area. On a 15-square-metre garage roof with a relatively long perimeter, edge and flashing work can account for 20 to 30 per cent of the total job cost.
Cutting corners on these details is where cheap quotes often make their savings. A poorly finished upstand or an edge trim that is not properly fixed and sealed will fail within a few years, regardless of how good the membrane itself is. When comparing quotes, check that the specification describes edge and upstand details explicitly.
On a ground-floor extension or single garage, scaffolding is often not needed - the roof is accessible from a ladder or from inside the property. On a taller structure, or where work extends to the junction with a two-storey wall, scaffolding becomes necessary and will add to the cost. A typical scaffold for a domestic flat roof job in Bungay might add £300 to £600 depending on the setup required.
Some roofers exclude scaffolding from their headline quote. Check whether access equipment is included or whether it will be charged separately.
Not every flat roof needs replacing. If the membrane is in broadly sound condition and the problem is an isolated split at an upstand or a failed outlet seal, a targeted repair will cost considerably less than a full replacement - often £150 to £400 depending on the detail involved.
The question is whether a repair will hold. On a membrane that is approaching the end of its natural life, repairing one area often means another fails within a year or two. A good roofer will tell you honestly whether a repair is a sound long-term decision or whether it is simply delaying an inevitable replacement. That advice should be based on a proper survey, not a preference for selling a larger job.
When you receive quotes for flat roofing work in Bungay, check that each one states the following clearly:
A quote that does not specify these things cannot be reliably compared to one that does. The cheapest number on the page may not represent the cheapest job once everything is accounted for.
A good roofer will survey the roof before quoting and provide a full written specification, so that you know what you are comparing. Call us to arrange a survey and get a clear picture of what your flat roof needs and what it will cost.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
