North Walsham Roofers carries out commercial roofing repairs, replacements, and new installations for businesses and landowners in Felmingham and the surrounding North Norfolk area.
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Commercial roofing covers a wide range of building types - retail units, agricultural barns, industrial sheds, farm outbuildings, offices, and workshops. The work ranges from patching a leaking felt flat roof to a full re-roof of a large pitched structure using profiled metal sheeting or natural slate. Whatever the building, the principles of a proper job are the same: correct specification of materials, proper detailing at junctions and edges, and weathertight fixings that will last.
Flat roof systems on commercial buildings are most commonly built-up felt or EPDM rubber membrane. Pitched roofs on agricultural and industrial buildings tend to use fibre cement sheeting, profiled steel, or occasionally clay pantiles on older farm buildings. Each material has a different expected lifespan, cost, and maintenance requirement, and choosing the right one for the building's use matters as much as the quality of the installation itself.
A common problem on older commercial buildings is that previous repairs have been carried out piecemeal - patches on top of patches - until the underlying deck or structure is compromised. Water ingress that goes undetected for months causes timber deck rot, insulation saturation, and in steel-framed buildings, corrosion of the purlins. A thorough inspection before any work begins is the only way to understand the full scope of what needs doing.
Commercial roofing prices vary considerably depending on the system, roof area, access requirements, and the condition of the existing substrate. As a general guide, EPDM rubber flat roofing on a commercial building typically costs in the region of £70 to £120 per square metre, fully installed including the membrane, adhesive, and edge trims. Built-up felt systems on larger roofs tend to sit at the lower end of that range for straightforward replacements.
Profiled steel or fibre cement sheet roofing on agricultural and industrial pitched roofs varies widely. Fibre cement replacement sheets installed over existing purlins might cost £40 to £80 per square metre, while a full structural re-roof with new purlins and insulated panels can run to £120 per square metre or more. Scaffolding, cherry picker hire, or other access arrangements add to the total and should always be itemised separately in any quotation you receive.
Lead flashing repairs on commercial buildings, around rooflights, parapet walls, or abutments, typically cost £200 to £600 depending on the length and complexity. Gutter replacement on a medium-sized commercial unit generally runs from £500 to £1,500. These are indicative ranges only - any contractor who quotes a firm price without inspecting the roof first should be treated with caution.
This is the part that most business owners and landowners get wrong, often because they are in a hurry after a leak or storm damage. Rushing to the first contractor who answers the phone can cost you far more in the long run. Taking a few days to assess your options properly is almost always worthwhile.
Before you speak to any contractor, be clear about what you are asking them to quote for. A leaking flat roof might need only a membrane repair, or it might need a full deck replacement - you probably do not know which until the roof has been inspected. Avoid asking for a price before an inspection has been done. A contractor who quotes blind is guessing, and that guess will either be too low (leading to expensive variations later) or padded to cover the unknown.
Ask each contractor to inspect the roof and provide a written specification before pricing. The specification should describe the existing build-up, what will be removed, what materials will be used, the fixing method, how edge details and flashings will be treated, and how water will be managed during the works. If two contractors inspect the same roof and come back with completely different specifications, ask each of them to explain why. Sometimes there is a genuine difference of approach; sometimes one of them has not looked carefully enough.
The following questions are worth putting to every contractor you are considering. Their answers - and how confidently and specifically they answer - will tell you a great deal about their experience and professionalism.
Pressure to sign quickly - often combined with a claim that a discounted price is only available today - is one of the clearest warning signs in any trade. A legitimate contractor with a full order book is not desperate for your signature before you have had time to think. Walk away from anyone who pushes you in this way.
Unusually low prices are another warning sign, particularly if the contractor cannot explain what is included and what is not. Commercial roofing materials are not cheap, and labour on large or complex roofs takes time to do properly. A price that seems too good to be true usually means corners are being cut somewhere - on materials specification, fixing details, or the number of operatives on the job.
Be wary of contractors who cannot or will not provide a written, itemised specification. A quotation that says only "supply and fit new flat roof" tells you almost nothing about what you are paying for. If a dispute arises later, you will have no way of proving what was or was not agreed.
Avoid paying cash with no paperwork. Beyond the obvious tax implications, it leaves you with no documentary record of who did the work, what was installed, or what was agreed. This matters if you need to make a claim, sell the property, or pursue the contractor for defective work.
A proper commercial roofing quotation should be a document you can read and understand, not a single-line price on a compliment slip. Look for the following as a minimum.
If a quotation is missing several of these items, go back and ask for them in writing. A contractor who refuses to provide detail in writing is a contractor whose promises are worth very little.
Trade body membership - for instance with the National Federation of Roofing Contractors or similar bodies - provides some assurance that a contractor has met minimum standards and is subject to a code of conduct. It is not a guarantee of quality, but it does mean someone has at least checked that the business exists and has accepted accountability to a professional body. Ask whether the contractor is a member of any trade association and check the membership directly on that organisation's website rather than taking the contractor's word for it.
Ask to see evidence of public liability insurance. On commercial roofing work, the minimum level of cover you should expect is £2 million, and many businesses require £5 million or more before allowing contractors on site. Ask for the certificate, check the expiry date, and confirm the level of cover. Do not accept verbal assurances.
If the building is tenanted or occupied, confirm that the contractor's insurance covers third-party liability for the occupants and their contents during the works.
Agreeing the work carefully is only half the job. Managing it well once it starts is equally important. Agree in advance who your point of contact is and how they will communicate progress. For larger jobs, a brief written update at the end of each day - even a short email or message - is not unreasonable to ask for.
Visit the site at the start of each working day if you can, or ask someone you trust to do so. Check that the materials on site match the specification. Check that temporary weatherproofing is in place before operatives leave each afternoon. Photograph progress regularly. If something does not look right, raise it immediately rather than waiting until the end of the job.
Do not make the final stage payment until you have walked the finished roof with the contractor and agreed that the work matches the specification. Look at edge details, flashings, outlets, and any areas around rooflights or penetrations. These are the places where shortcuts most often appear.
The two systems most commonly specified for commercial flat roofs are built-up felt and EPDM rubber membrane. Built-up felt - typically three layers of torch-on or cold-applied felt - is a well-understood system that most roofing contractors can install. When correctly specified and detailed, it performs well for 15 to 20 years. The critical factor is the quality of detailing at upstands and edges, where failures most often start.
EPDM rubber membrane is increasingly common on commercial flat roofs because it is lighter, easier to install as a single piece on smaller roofs, and resistant to UV degradation. A correctly installed EPDM system can last 30 years or more. It is particularly suited to roofs with roof lights, outlets, or complex geometry, where a single-piece membrane reduces the number of seams and potential failure points.
Both systems require the deck to be in sound condition before the membrane is applied. Installing a new membrane over a saturated or delaminating deck is a false economy - the deck will continue to deteriorate underneath, and the new membrane will fail prematurely.
Agricultural and industrial buildings frequently have pitched roofs in fibre cement or profiled steel sheeting. These materials are durable but not maintenance-free. Fibre cement sheets become porous with age, particularly on north-facing slopes where algae and moss growth accelerates surface breakdown. Fixing screws corrode, allowing water to track down the fixing holes into the purlin below.
A full re-sheet is the correct solution when a significant proportion of sheets are cracked, porous, or poorly fixed. Patching individual sheets can extend roof life by a few years but is rarely cost-effective on a roof where the overall condition is poor. When specifying a re-sheet, confirm whether the existing purlins will be reused and, if so, that they have been inspected for corrosion or rot before the new sheets go on.
Insulated composite panels are increasingly used on new commercial and agricultural builds. They provide a single layer that acts as both roof covering and insulation, and they are faster to install than a traditional build-up. On existing buildings, they can be fitted over existing sheeting in some cases, avoiding the cost of stripping and disposing of the old roof - but this depends on the condition and loadbearing capacity of the existing structure.
If you have a commercial or agricultural building near Felmingham that needs attention - whether it is a known leak, visible damage, or just a roof that has not been looked at for several years - the sensible starting point is a proper inspection. Call North Walsham Roofers to arrange a commercial roof survey, and we will give you a clear, written picture of what is there and what, if anything, needs doing.
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Call any time. Calls are answered day and night and passed straight to our roofers.
