Brandon Roofers provides commercial roofing in Methwold and the surrounding area, working on industrial units, warehouses, retail premises and office buildings with felt, EPDM and single-ply systems.
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Commercial roofing covers a wide range of building types - from small retail units and farm outbuildings to large warehouses and multi-unit industrial estates. The systems used are different from domestic roofing, the access requirements are more involved, and the stakes of getting it wrong are higher when a business is operating beneath the roof. Brandon Roofers carries out commercial roofing in Methwold and nearby, working on both flat and pitched commercial roofs.
On this page we focus on costs: what a commercial roofing project typically costs in the UK, what drives the price up or down, and what you should watch out for when comparing quotes.
Commercial roofing costs vary considerably depending on several factors. Understanding what those factors are helps you assess whether a quote is reasonable and ask the right questions before you commit.
As a broad guide, commercial flat roof replacement in the UK typically costs between £70 and £120 per square metre for a standard built-up felt system, including stripping the old covering, preparing the deck and installing a new three-layer cap sheet system. EPDM rubber membranes run from around £80 to £130 per square metre installed. Single-ply systems (TPO or PVC) sit in a similar range, from approximately £85 to £140 per square metre, depending on the fixing method and the extent of detailing required.
These figures are for the membrane system itself, assuming a sound deck. Deck repairs, scaffold, access equipment hire, and waste disposal are typically priced separately or as additional line items in a detailed quote.
For context, a 500 square metre warehouse flat roof replacement using a mid-range felt system, including scaffold and waste removal, might total anywhere from £40,000 to £70,000 depending on the specific conditions of the building. Smaller roofs - a 100 square metre unit, for example - might cost £10,000 to £18,000, where the fixed costs of access and setup represent a higher proportion of the total.
Repair work rather than full replacement is always cheaper where the deck is sound and the existing system has failed only in isolated areas. A split or open seam on an otherwise intact EPDM roof might cost £500 to £1,500 to repair properly. Failing to repair it promptly usually results in water reaching the deck, at which point a full replacement becomes unavoidable.
Built-up felt (BUR) remains one of the most common commercial flat roof systems in the UK, particularly on older industrial and retail buildings. A good quality installation uses a minimum of three layers - typically a venting base sheet, an intermediate layer, and a mineral-faced cap sheet - all torched together to form a continuous waterproofed surface.
The material cost of a three-layer felt system is lower than EPDM or single-ply, which is why it remains competitive on budget-conscious projects. The trade-off is that the quality of installation matters enormously - poorly torched laps or inadequate upstand heights will fail within a few years. On a correctly installed and maintained felt system, a lifespan of 15 to 20 years is achievable.
Felt systems are also relatively straightforward to repair and to overlay. Where the deck is sound and the existing felt is not too degraded, an overlay with a new cap sheet is sometimes a cost-effective option, avoiding the cost of a full strip. This approach has limits - too many layers adds weight and can trap moisture - but for a first overlay on a structurally sound roof, it can extend the life of the covering at significantly lower cost than a full replacement.
EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane used extensively on commercial flat roofs. It is available in large sheets, which reduces the number of seams on the finished roof and therefore the number of potential failure points. It handles movement and temperature change well, which matters on larger roof areas where thermal expansion can stress a rigid system.
EPDM is either fully bonded to the deck with a contact adhesive, or mechanically fixed at the perimeter and weighted with ballast (aggregate or paving slabs). Ballasted systems require the structure to carry the additional load - always worth confirming with a structural engineer on older buildings. Fully bonded systems are lighter but require a smooth, clean deck surface.
The installed cost of EPDM is higher than standard felt, but the lower number of seams and the material's durability mean it is often a better value proposition over the life of the roof. Manufacturers typically rate the material itself for 20 to 30 years, though installation quality and maintenance history both affect real-world performance.
Single-ply roofing systems - TPO (thermoplastic polyolefin) and PVC (polyvinyl chloride) are the most common types - use a single layer of factory-manufactured membrane, heat-welded at the seams to produce a continuous waterproof surface. The welded seam is a significant advantage over felt laps: a correctly heat-welded seam in TPO or PVC is as strong as the parent material and can be probed and tested during installation.
Single-ply systems are lightweight and can be mechanically fixed, fully adhered, or ballasted depending on the substrate and wind uplift requirements. They are specified on many new commercial buildings and on refurbishments where weight is a concern. The material cost is higher than felt, but installation is faster on large open roofs, which can reduce total labour cost on bigger projects.
Typical installed costs for single-ply sit at the upper end of the flat roofing range. On a straightforward large roof with few penetrations, competitive pricing is achievable. On a complex roof with many details, the cost advantage narrows.
Access is frequently underestimated in commercial roofing budgets. A domestic roofer works from a ladder or a short scaffold tower. A commercial roofer working on a flat-roofed unit 6 to 8 metres high, or a pitched industrial roof at 10 metres or more, needs a proper working platform - either a full independent scaffold or a MEWP.
Independent scaffold on a commercial building typically costs £2,000 to £8,000 or more depending on the size and height, with hire period adding to the total if the job takes multiple weeks. A MEWP - a cherry picker or scissor lift - is cheaper for shorter duration access but requires ground conditions suitable for the machine and space to manoeuvre. Where a car park or yard is in use by the business, a MEWP may not be practical.
Always check whether access is included in the quoted price or priced separately. Some quotes exclude scaffold and present a lower headline figure. The total cost of the job is what matters - access is not optional.
Commercial roofing quotes can look very different from one contractor to the next, and a lower headline price does not always mean a lower total cost when the job is complete.
A detailed, itemised quote is always preferable to a single lump sum. It lets you compare like with like and understand what is and is not covered if unexpected conditions are found during the job.
One of the most common decisions in commercial roofing is whether to repair or replace. The answer depends on the age and condition of the existing system, the extent of any failure, and the condition of the deck beneath.
A roof that has failed in one or two isolated points but is otherwise sound is almost always worth repairing rather than replacing. A roof that has failed across multiple areas, or where the deck is wet or deteriorating beneath, generally needs full replacement - repeated repairs on a failing system cost more in the long run than a single properly specified replacement.
A proper survey before any decision is essential. Any quote for commercial roofing work that does not include a site visit and inspection of the existing system is not a quote you should rely on.
Brandon Roofers is based in Brandon and covers Methwold and the surrounding area. If you have a commercial property that needs a survey and a clear, itemised quote, call us to arrange a visit. We will survey the roof, explain your options and give you an honest assessment of what the work involves and what it is likely to cost.
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Call any time. Calls are answered day and night and passed straight to our roofers.
