Ely Roofers carries out commercial roofing in Fordham and across Cambridgeshire, covering flat roof refurbishment, metal sheet systems and single-ply membrane installation.
Call any time. Calls are answered day and night and passed straight to our roofers.
Pricing for commercial roofing varies more widely than most other building trades, and there are good reasons for that. The size of the roof, the system being installed, the condition of what is already there, access requirements and the complexity of edge details and penetrations all move the cost significantly. A figure taken from a general guide or a competitor's website without a site survey is almost meaningless.
What you can do is understand which factors push prices up and which bring them down, so that when you receive quotes you can see whether you are comparing like for like, and ask the right questions if one quote is noticeably cheaper than another.
These are current typical ranges for commercial roofing in the Cambridgeshire area. They cover supply and installation, including insulation and standard edge details, but not scaffolding, deck repairs or exceptional penetration details, which are priced separately.
These are genuine ballpark figures based on current market conditions in the Cambridgeshire area. Your actual cost will land somewhere within or outside these ranges depending on the specific factors discussed below.
Deck condition. If the existing roof deck - whether timber, concrete or steel - is damaged, saturated or structurally inadequate, it needs to be repaired or replaced before the new system can go on. Deck remediation can add £15 to £40 per square metre or more to the overall cost, depending on the extent of the damage. This is not optional; installing a new membrane over a poor deck guarantees early failure.
Access. If the roof cannot be reached safely without scaffold, the scaffold cost is additional. On a two-storey warehouse or a building on a busy commercial site, scaffold hire and erection can add several thousand pounds to the project. MEWP (mobile elevating work platform) hire is typically less expensive than full scaffold where the access requirement allows it, but not every roof and site permits MEWP use.
Number and complexity of penetrations. Every pipe, flue, extract duct, rooflight or piece of plant that penetrates the roof membrane adds time and materials to the job. A flat roof with a clean, uninterrupted surface is far quicker to waterproof than one covered in mechanical and electrical services. On some commercial buildings, detailing around penetrations accounts for a substantial part of the installation cost.
Insulation specification. Building regulations and practical thermal performance requirements mean that commercial roofs generally need meaningful insulation thickness - 100mm to 150mm of PIR insulation board is common. Thicker insulation costs more. If you are upgrading from an old, poorly insulated roof, bringing the specification up to an acceptable standard is worth doing but it adds to the initial outlay.
Stripping the existing system. Removing and disposing of old felt, mineral wool or sheet metal creates labour and skip costs. On large roofs with multiple existing felt layers, stripping costs add up. Skip hire and asbestos management (where older roof panels or flashings contain asbestos-containing materials) can be significant additional items on older commercial buildings.
Small or awkward roof areas. Roofing contractors have minimum mobilisation costs - the cost of getting people, equipment and materials to site. A 50-square-metre roof costs proportionally more per square metre to re-roof than a 500-square-metre one, simply because fixed costs are spread over fewer square metres.
Good deck condition. If the roof deck is sound and the falls are correct, a straightforward overlay or strip-and-re-roof is the simplest possible scope of work. No deck repairs mean lower cost.
Simple geometry and few penetrations. A rectangular flat roof with one or two outlets and minimal plant is the cheapest type of commercial roof to waterproof. Clean geometry means less waste and fewer awkward cuts and details.
Good access. A ground-level roof or one accessible from a loading bay without scaffold keeps access costs low. If scaffold is not needed, that cost simply does not appear in the quote.
Larger area. As the roof area increases, the cost per square metre generally falls, because fixed costs are spread further and material ordering becomes more efficient.
A significant price difference between two commercial roofing quotes is rarely just about one contractor being cheaper. The most common reasons for divergence are: different system specifications (a thinner membrane or fewer insulation layers), different assumptions about deck condition (one contractor has surveyed it properly, another has not), different allowances for access equipment, and different levels of detail work at edges and penetrations.
Before accepting any quote, check that the specification is written down and covers the system type, insulation thickness, how edge details and penetrations will be treated, and what happens if the deck condition turns out to be worse than expected. An open-ended day-rate clause for deck repairs is not unreasonable, but you should know it is there before you sign.
The only way to give you an accurate cost for commercial roofing in Fordham is to survey the roof in person. We assess the deck, the existing system, the access requirements and the penetration details before putting any figure together. Call us to arrange a site survey and we will give you a written breakdown of what the work involves and what it will cost.
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Call any time. Calls are answered day and night and passed straight to our roofers.
