Commercial Roofing in Ely

Expert Commercial Roofing
in Ely

What Does Commercial Roofing Actually Cost?

Cost is usually the first question, and it is also the one that gets the vaguest answers. The honest answer is that commercial roofing prices vary considerably depending on the size of the roof, what is on it now, what is going on it, the state of the deck or structure underneath, and the complexity of the detailing. What we can do is give you a clear picture of the typical ranges, what sits at the lower and upper ends of those ranges, and what pushes a job from one end to the other.

Commercial flat roof replacement in Ely typically costs between £40 and £100 per square metre fully installed, depending on the system chosen and the condition of the existing roof. That range is wide because the specification and the prep work beneath the membrane account for a large part of the total cost.

Flat Roof Replacement Costs

Torch-on felt is the most cost-effective option for large flat roofs. A straightforward two-layer torch-on felt replacement on a sound, dry deck typically runs from around £40 to £60 per square metre installed. A three-layer built-up system with a mineral-finish cap sheet will sit at the upper end of that range. On a simple 200 sq m warehouse roof with good access and a sound deck, you might expect to pay in the region of £8,000 to £12,000 for a full felt replacement. That is a broad guide, not a fixed price - the exact figure depends on the specifics of your building.

EPDM rubber membrane systems carry a higher upfront cost - typically £50 to £80 per square metre installed for commercial applications. On a 200 sq m roof, that puts a full EPDM replacement at roughly £10,000 to £16,000. The longer expected service life of EPDM (25 to 35 years or more for a quality system, compared to 15 to 25 years for felt) means the cost per year of roof life can be comparable or better, particularly if the disruption cost of future roofing work is factored in.

Single-ply TPO or PVC membrane systems, specified on larger or more complex commercial roofs, typically cost from around £60 to £100 per square metre installed. The premium reflects both the material cost and the specialist installation equipment required.

What Pushes the Cost Up

Several factors consistently add cost to a commercial roofing job. Understanding them in advance helps you budget more accurately and avoid surprises.

• Deck condition: If the existing deck - whether timber, concrete or metal - is damaged, saturated or structurally compromised, it needs repairing or replacing before the new membrane goes on. This can add significantly to the cost and is sometimes not fully apparent until the old covering is stripped back. A good contractor will flag this risk at survey stage and explain how they price for unknowns.
• Wet insulation: On roofs where water has been sitting in the build-up for some time, the insulation may be saturated and need full replacement. Wet insulation cannot be overlaid - it must be stripped. Replacing insulation adds both material and labour cost.
• Access: A simple low-level flat roof on a single-storey unit with a clear yard is the easiest access scenario. Multi-storey buildings, town centre locations with restricted street access, live operational sites and roofs adjacent to the public all add cost through additional scaffold requirements, traffic management, out-of-hours working or longer crane reaches for material delivery.
• Detailing complexity: A plain rectangular flat roof with two outlets and a simple parapet is straightforward to waterproof. A roof with multiple pipe penetrations, rooflights, plant equipment, internal drainage outlets and complex geometry takes significantly more time and material. Every penetration is a potential leak point and needs to be detailed carefully.
• Existing overlay layers: Some commercial flat roofs have been overlaid multiple times over the years, with each new felt layer going over the last. There comes a point where the accumulated layers are so heavy and uneven that a full strip back is the only sensible option. Stripping several layers of felt and disposing of the material adds cost compared to a clean re-cover.
• Out-of-hours working: Where a business cannot afford to have roofing work taking place during trading hours, early starts, evening work or weekend working can be arranged - but they carry a premium.

What Keeps the Cost Down

Equally, some factors work in your favour when it comes to cost.

• A sound, dry deck: If the existing deck is in good condition and the moisture test confirms the insulation is dry, an overlay rather than a full strip-back may be possible. This saves the labour and disposal cost of stripping the old covering.
• Good access: A single-storey building with clear access for a scaffold tower or MEWP, on a site with space for a skip and material deliveries, costs significantly less to work on than a restricted urban site.
• A simple roof layout: Large, open roof areas with minimal penetrations and straightforward drainage are quicker and cheaper to waterproof than complex, cluttered roof surfaces.
• Combining work: If guttering, flashings and rooflights all need attention alongside the main roof, doing everything together is cheaper than having separate mobilisations. Scaffold, access and van costs are shared across the full scope of work.

Pitched Roof Costs on Commercial Buildings

Repair and replacement costs on commercial pitched roofs vary as widely as flat roofs. Selective tile or slate repairs, where a small number of slates or tiles have slipped or broken, can cost from a few hundred pounds depending on access requirements. A full strip and re-roof of a large commercial pitched roof in artificial slate or concrete tile will run to tens of thousands of pounds for a large building.

Natural slate costs significantly more than artificial alternatives - the material itself is more expensive and the skills required are less common. Where planning conditions or building character require natural slate, that cost is unavoidable. Where there is flexibility on materials, a discussion at survey stage about the options and the price difference is worthwhile.

Leadwork repairs - re-dressing flashings at an abutment, replacing a valley, re-pointing stepped flashings - are typically priced per linear metre of work. Lead valley replacement on a commercial building typically runs from around £100 to £200 per linear metre depending on valley width and access. These are rough guides rather than fixed figures.

Metal Sheet Roofs and Agricultural Buildings

Profiled steel sheet roofing on industrial units, warehouses and agricultural buildings around Ely and the surrounding area is often priced per square metre for over-sheeting (laying new sheets over the existing) or full strip and re-sheet. Over-sheeting, where the existing structure is sound and the sheets have adequate fall, is typically £20 to £40 per square metre. Full strip and re-sheet with new insulation and liner costs more - typically £40 to £70 per square metre or above for a properly insulated system.

Guttering replacement on large commercial buildings - particularly cast aluminium or steel systems with long runs - is usually priced per linear metre. Typical costs for commercial aluminium guttering replacement run from around £30 to £60 per linear metre installed, depending on profile size, access and whether the fascia or rafter feet need attention at the same time.

Getting an Accurate Price for Your Building

Every building is different, and no one can give you an accurate price without seeing the roof. The figures above are realistic UK ranges to help you budget, but your actual cost depends on your specific building, its condition and what needs doing. The only way to get a figure you can rely on is a proper inspection.

Newmarket Roofers works on commercial properties in Ely and across the area including Newmarket, Cambridge, Bury St Edmunds and Burwell. Call us to arrange a commercial roof survey and we will give you a clear, itemised assessment of the work and what it will cost.