Haverhill Roofers provides commercial roofing repairs and replacements for businesses in Sudbury and the surrounding area, working on flat roofs, profiled metal sheet roofs, box gutters and rooflights.
Call any time. Calls are answered day and night and passed straight to our roofers.
Cost is the question almost every business owner asks first, and it is a reasonable one. Commercial roofing is not a small spend, and the range of prices quoted by different contractors for apparently similar work can be confusing. This page explains what the main cost drivers are, gives realistic ballpark figures and tells you what to check before accepting a quote.
As a general guide, flat roof replacement on a commercial building in the UK currently costs in the region of £50 to £120 per square metre for the waterproof membrane and associated works, depending on material, roof condition and access. That range is wide for a reason - the variables below can move the final number significantly in either direction.
Larger roofs have a lower cost per square metre than small ones because the fixed costs of access, materials delivery and mobilising a crew are spread over more area. A 500 square metre flat roof replacement will typically cost noticeably less per square metre than a 100 square metre one on the same building type.
Roof shape matters too. A plain rectangular flat roof with one outlet and a simple parapet is straightforward. A roof broken up by plant rooms, multiple upstands, projecting structures, rooflights and internal box gutters takes longer and uses more material per square metre of covered area. Every internal corner, upstand and penetration is a separate detail that needs time and material.
The condition of the substrate beneath the membrane is the single biggest variable that can shift the cost of a flat roof job after work has started. If the deck boards or insulation are wet and degraded, they must come out before the new membrane goes down. The cost of substrate replacement depends on how much is affected, what material it is and how accessible it is.
A job quoted at £8,000 for membrane only can become £12,000 or more if a significant area of substrate needs replacing. This is not a rogue contractor adding extras - it is the reality of working on roofs that have been leaking for years. The way to manage this is to agree a clear rate for additional substrate work before the job starts, so there are no surprises mid-project.
Ask any contractor you are considering: what is included in the substrate, and what is your day-rate or per-square-metre rate if we find more damage once the old surface is stripped? If that question gets a vague answer, look elsewhere.
The membrane or roofing system you choose has a direct effect on price. Torch-on SBS felt is generally the lowest material cost option for flat roofs. EPDM rubber membrane costs more upfront but has a longer expected lifespan, which can make it cheaper over the building's life. Profiled metal sheet systems - particularly insulated composite panels - carry significantly higher material costs but are the standard for large industrial and agricultural buildings for good reason.
Choosing a cheaper material to reduce the upfront figure is not always the wrong decision, but it helps to know the trade-off. A torch-on felt roof at £60 per square metre that needs replacing in 15 years costs more over 30 years than an EPDM system at £85 per square metre that holds up for 35 to 40 years.
Access to the roof and to the site generally is one of the most variable cost elements in commercial roofing. A low-rise flat roof with an adjacent hard-standing area and easy skip access is cheap to work on. A roof above a working factory floor where access has to be arranged outside working hours, materials have to be craned in because there is no yard access, or where the building is close to a shared boundary, costs more to service logistically.
On profiled metal roofs, accessing the full sheet length safely often requires a MEWP (mobile elevating work platform), which adds a daily hire cost. Scaffold around a multi-storey commercial building is a significant additional spend - typically £2,000 to £6,000 or more depending on the perimeter and height, and this is sometimes listed separately from the roofing cost itself. Check whether scaffold or MEWP costs are included in your quote.
These ancillary items are often under-priced or left out of initial quotes. Box gutter relining with lead or a compatible membrane system typically costs £80 to £150 per linear metre depending on the gutter width and depth, access and how much preparation is needed. Lead flashings are priced by the linear metre or by the kilogram of lead used - Code 4 and Code 5 lead are the standard weights for most commercial applications.
Rooflight replacement costs depend on size, specification and how many are involved. A standard single-skin polycarbonate dome replacement on an existing kerb might cost £300 to £600 supplied and fitted. An insulated double-skin unit will cost more but will improve the building's heat loss significantly, which can be worth calculating against energy bills.
Not every commercial roof problem needs a full replacement. Isolated membrane damage, failed lap sealant on a metal sheet roof, a corroded box gutter section or a cracked rooflight can all be repaired at a fraction of the cost of a full replacement, provided the surrounding material is sound. The decision between repair and replacement should be based on the overall condition of the membrane - if more than 25 to 30 per cent of the surface has failed or is suspect, a full replacement usually works out better value than repeated repair visits.
A survey that honestly tells you the roof has five to eight years left and is worth patching for now is more useful than one that automatically recommends a full replacement. Ask for an honest assessment of remaining life before committing to anything.
We work on commercial roofs in Sudbury and across the wider area, including Haverhill, Clare, Long Melford, Glemsford, Lavenham, Stoke by Clare, Poslingford, Ashen and nearby villages. Distance from our Haverhill base does not automatically add to the cost - it depends on the size and duration of the job, not the postcode.
If you want a clear, itemised figure for your roof - and an honest view on whether repair or replacement is the right call - phone us to arrange a site visit. We will look at the roof properly and give you figures that are based on what we actually find, not a ballpark guess from the ground.
No obligation · We'll call you to arrange a free visit
Call any time. Calls are answered day and night and passed straight to our roofers.
