Brandon Roofers carries out commercial roofing in Watton, from targeted repairs on industrial and retail roofs to full flat roof replacement using felt and single-ply membrane systems.
We work on the full range of commercial buildings: warehouses, industrial units, retail premises and office buildings. Commercial roofs come in a variety of forms, from large flat felt or single-ply membrane systems to pitched metal sheet and fibre cement roofs on older industrial stock. Each has its own failure modes and its own repair and replacement options.
We cover Watton and the surrounding area from our base in Brandon. Where a business cannot afford downtime, we can discuss working outside normal trading hours so the job does not disrupt operations.
This is the question that matters most for any commercial building owner or manager facing a roof problem. Getting it wrong in either direction costs money. Repairing a roof that needs replacing means you will be back in the same position within a few years, having spent money that counted for little. Replacing a roof that could have been repaired means unnecessary capital expenditure that the building did not require.
The answer depends on several factors, and a good roofer should walk you through each one rather than default to whichever answer suits their order book. Here is how to think through the decision.
Age is not the only factor, but it is an important starting point. A standard built-up felt flat roof, properly installed on a sound deck, typically performs for around fifteen to twenty years. A single-ply EPDM membrane, well specified and correctly detailed, can last longer. If your roof is approaching or beyond those ages, a repair is rarely the right answer even if the immediate problem looks contained, because other areas are likely to be close to failure.
A common problem with older commercial felt roofs is that by the time one section shows an active leak, the membrane across a much wider area has already degraded, lost its flexibility, and begun to crack or blister. Patching the obvious leak stops that specific entry point but leaves the rest of the roof on borrowed time. You may get one or two more winters out of it, but another leak is likely, often in a completely different location.
If the roof is under ten years old and the problem is clearly localised, repair makes more sense. If it is fifteen years or older and you have had more than one leak in recent years, the economics of replacement usually win.
A roofer should carry out a survey of the whole roof, not just the area directly above where the leak is showing internally. Water travels. A leak appearing in the middle of a warehouse floor may have entered the roof at a point several metres away, tracked along a valley or down a fall, and dropped through wherever it found a gap. Fixing only the visible damage without understanding where the water actually got in is a common cause of "repairs" that do not resolve the problem.
During a survey, a roofer should check for the following across the whole roof area:
If damage is concentrated in one or two small areas and the rest of the membrane is sound, repair is a reasonable option. If the survey finds problems across thirty percent or more of the roof area, replacement becomes more cost-effective because the labour cost of a repair visits multiple areas will approach or exceed the cost of a full strip and re-cover.
The deck is the structural surface beneath the roof covering. On commercial buildings this is typically concrete, timber boarding, or a metal profiled sheet. The condition of the deck is a critical factor in the repair-versus-replace decision, and it is one that cannot always be fully assessed without removing the existing covering.
A timber deck that has been wet for an extended period can be soft, rotted, or structurally compromised. A concrete deck can develop cracks that allow water to migrate below the membrane. A metal deck can corrode, particularly around fixings. If the deck is in poor condition, any repair to the covering above it is built on a failing foundation, and the only sensible course is to strip the old covering, repair or replace the deck sections that are damaged, and re-cover with a new system.
If the deck is sound, a well-executed repair to the covering can last several years and defer full replacement until a more convenient time financially. Ask the contractor what they found when they assessed the deck, and ask them to explain how they assessed it. If they have not looked at the deck at all, that is a gap in their survey.
Cost comparisons between repair and replacement are rarely straightforward, but some typical UK figures are useful as a reference point.
A targeted flat roof repair on a commercial building, covering an area of up to five to ten square metres with new felt or membrane and proper detailing of the surrounding flashings, typically costs between £300 and £900 depending on access requirements and the complexity of the detailing. If scaffolding is needed to reach the area safely, that cost sits on top and can add £500 to £2,000 or more depending on the building.
A full flat roof replacement on a commercial building typically runs between £40 and £90 per square metre for the covering itself, depending on the system. A small unit of 150 square metres might cost £7,000 to £13,000 all in. A larger warehouse of 600 square metres could run from £28,000 to £55,000 or beyond, depending on system choice, access method, and the amount of deck repair required.
The repair-versus-replace calculation looks different depending on the roof size. On a large roof, the cost per square metre of patch repairs done across multiple visits over several years can approach or exceed the cost of a single replacement. On a small roof, a good repair can buy several years of serviceable life at a fraction of the replacement cost.
Repair makes sense when:
In these cases, a targeted repair that addresses the actual water entry point, including proper detailing of any flashings and upstands in the repaired area, is a legitimate and cost-effective approach. The key is that the repair must address the real source of the problem, not just the visible symptom of it.
Replacement makes sense when:
A replacement, done properly with a well-specified system on a sound deck with correctly detailed drainage, should give you fifteen to twenty-five years of reliable performance depending on the system chosen, without the ongoing cost and disruption of repeat repair visits.
The quality of the initial survey determines whether you end up with the right recommendation. A roofer who walks around the roof for five minutes and tells you it needs replacing without being able to explain where each problem is and why it points to replacement rather than repair has not given you a survey. Similarly, a contractor who patches an obvious leak without assessing the wider roof condition is solving your immediate problem while leaving a larger one in place.
Ask the roofer to walk you through what they found on the roof and show you the specific areas of concern. Ask them to explain why each problem points towards repair or replacement. A clear, specific answer demonstrates that they have actually looked at the roof rather than defaulting to a standard recommendation.
We are based in Brandon and cover Watton and the surrounding area for both repairs and full commercial roof replacements. If you have a commercial roof that needs assessing, call us to arrange a survey and we will give you a straight assessment of what the roof needs and what each option 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.
