North Walsham Roofers provides commercial roofing repairs, replacements, and new installations for business owners in Brundall and the surrounding Norfolk area.
A failing roof on a commercial building is a different problem to one on a house. Stock gets damaged, staff are disrupted, and in some cases premises have to close while work is carried out. Getting the right contractor in before that happens matters, and knowing how to tell a competent commercial roofer from an unreliable one is genuinely useful before you pick up the phone.
We carry out roofing work on commercial and industrial buildings in Brundall and across Norfolk - from flat roof repairs on retail units and office blocks to full pitched roof replacements on workshops, agricultural buildings, and storage facilities. The information below is designed to help you ask the right questions and make a confident decision, whoever you end up hiring.
Commercial roofing covers a wider range of systems than residential work. Flat roofs are common on retail, light industrial, and office buildings. Pitched roofs appear on agricultural units, older commercial premises, and larger warehouses. Each system has different materials, different failure points, and different maintenance needs.
Flat roof systems used on commercial buildings typically include built-up felt, single-ply membranes, and EPDM rubber. Felt systems are the most common on older buildings and are prone to blistering, pooling water, and seam failure over time. Single-ply and EPDM systems tend to be more durable and easier to repair when something does go wrong. A good contractor will survey the existing system before recommending a replacement material rather than defaulting to whatever they stock.
Pitched commercial roofs are often clad in profiled metal sheeting, fibre cement, or concrete and clay tiles depending on the age and use of the building. Agricultural roofs in particular tend to be large and exposed, and a contractor needs experience working at scale to do the job safely and efficiently.
This is the section most business owners skip, and it is where the problems start. Choosing a contractor quickly, based on price alone, is the single most common reason commercial roofing jobs go wrong. The following questions are practical ones you should be asking before you agree to anything.
Residential and commercial roofing are not the same trade. A roofer who mainly works on houses may not have experience with the access equipment, health and safety planning, or material systems that commercial work requires. Ask specifically for examples of similar buildings - flat-roofed industrial units if that is what you have, or large pitched roofs if yours is agricultural or warehouse-scale.
Photographs are the minimum. A contractor who has done the work will have them. If they cannot show you anything comparable, that tells you something useful.
Commercial roofing almost always involves scaffolding, cherry pickers, or MIPAF-compliant access systems. On a working business premises, how that access is set up affects your customers, your staff, and sometimes neighbouring properties. Ask the contractor to explain their access plan before work starts, and ask who is responsible for booking and managing the equipment.
A vague answer here is a warning sign. A contractor who has done commercial work before will give you a clear answer without hesitation.
Commercial roofing quotes vary enormously in what they cover. A low headline price may exclude scaffolding, waste removal, or the cost of replacing deteriorated decking or insulation found once the old roof is stripped. Ask for a written breakdown that itemises materials, labour, access, and any assumptions the price is based on.
If a quote does not specify the material being used, the thickness of any insulation, or what happens if additional damage is found, push for that detail before you sign. Vague quotes lead to variation charges once work is underway.
Typical costs for commercial flat roof replacement in the UK currently run from around £70 to £140 per square metre depending on the system chosen, the condition of the existing deck, and access difficulty. A straightforward EPDM replacement on a single-storey unit will be at the lower end of that range. A full strip-and-relay with new insulation and decking on a multi-section roof will be higher. Get at least two itemised quotes before deciding.
A competent contractor should have a clear answer to this before work starts. On retail or food premises, noise, dust, and access restrictions all affect trading. Ask whether work can be phased to keep part of the building operational, and whether out-of-hours working is possible for sensitive sections.
Ask also about weather contingency - what happens if the job is half-stripped and rain arrives. A professional contractor will have a clear protocol for protecting an open building and will not leave you exposed overnight.
This matters more on commercial jobs than it might seem. Ask whether the person you are dealing with will be present on site, or whether the job will be handed to a sub-contracted crew. If sub-contractors are used, ask whether they are directly supervised and whether the primary contractor takes responsibility for their work.
On larger commercial jobs it is normal to use specialist sub-contractors for elements like leadwork or membrane installation. What matters is that there is clear accountability and one named person responsible for the finished job.
Ask directly: if there is a leak within six months of completion, how is that handled? A contractor who is confident in their work will explain their process clearly - this is different from a blanket guarantee, which is a separate commercial arrangement. You want to know the practical answer: do they come back, how quickly, and who pays?
Ask the same question about material manufacturer warranties. Some commercial membrane systems carry independent manufacturer warranties of ten years or more, issued by the manufacturer directly to the building owner. This is separate from anything the contractor offers and is worth asking about specifically - it is the manufacturer's own promise, not the contractor's.
On commercial roofing projects, a contractor may be required to provide a method statement and risk assessment before work starts, particularly on larger jobs or where the building is occupied. Ask whether they can produce these documents. A contractor who has done commercial work routinely will have standard formats they can complete quickly. One who hesitates or does not know what you are asking for has likely not worked at commercial scale before.
For larger or more complex jobs, ask whether a Construction Phase Plan is needed and who will produce it. On straightforward repairs this is often not required, but on a full roof replacement on an occupied building it may be.
None of these on their own make a contractor unacceptable, but a pattern of them should prompt you to look elsewhere. A lower price that comes with no written breakdown and no references is not a saving - it is a risk transfer onto you.
Flat roofs are the most common source of commercial roofing problems. Ponding water - where water sits rather than draining - accelerates the breakdown of felt and membrane systems. This is usually caused by inadequate falls in the original design, blocked outlets, or deflection in the deck over time. A roofer carrying out a repair should check drainage as well as the visible damage, because fixing a blister without addressing the standing water will not solve the underlying problem.
Flashings and upstands are another common failure point. Where the flat roof meets a parapet wall, a skylight curb, or an extract duct, the junction needs to be sealed correctly. These junctions move slightly with thermal expansion and contraction, and sealant alone is not a durable solution on a commercial building. Lead, code-appropriate aluminium trim, or purpose-made membrane details should be used.
On older profiled metal roofs, screw fixings corrode and the neoprene washers beneath them deteriorate. This allows water to track in along the fixing rather than around it. A systematic check of all fixings and replacement of failed ones is often more cost-effective than a full re-roof if the sheets themselves are still sound.
If you are building new or planning a significant replacement, this question is worth thinking about. Flat roofs are cheaper to install per square metre and easier to integrate with plant rooms, extraction, and rooftop services. Pitched roofs cost more upfront but generally have a longer service life if the covering is maintained, and they drain more naturally.
For agricultural and storage buildings, profiled metal on a pitched frame is typically the most cost-effective option over a twenty-year horizon. For retail and office units, a quality flat membrane system is usually the practical choice given the building footprint and the rooftop services involved.
Any contractor quoting for commercial work should carry out a physical survey before submitting a price. A quote prepared from photographs alone or from a description over the phone is unlikely to be accurate. The survey should include a check of the deck condition (not just the surface covering), the drainage arrangement, any existing insulation, and the condition of flashings and upstands.
On flat roofs, a damp or moisture survey is useful on older systems where the insulation layer may have absorbed water without the surface showing obvious damage. This can be done by infrared thermal imaging or by core sampling. Ask whether this is included in the survey or whether it is a separate cost.
Once you have chosen a contractor and agreed a price, a few simple steps protect you through the job. Get the agreed spec in writing before any payment is made. Agree a payment schedule tied to stages of work rather than a large upfront deposit. Make sure you know who to contact on site if something does not look right during the work.
At the end of the job, walk the roof with the contractor if access allows, or ask for photographs of completed details - flashings, drainage outlets, upstands, and any areas that were specifically identified as problems in the survey. A contractor confident in their work will not hesitate to show you.
If you have commercial premises in Brundall or the surrounding area and want a survey and written quote from North Walsham Roofers, call us directly to arrange a visit at a time that suits your business.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
