Commercial roof prices are harder to pin down than domestic ones. A house roof has a handful of shapes and a handful of coverings, so published cost guides can give a useful average. A warehouse, a shop parade or a school block has an area, an access problem, a drainage layout and a set of rooflights that belong to that building alone. Two units of the same size on the same estate can differ by thousands for reasons that never show in a rate per square metre. This guide sets out the only commercial figures we can source, says openly how much weight they carry, and then explains what sits behind a price: the system chosen, the insulation, the edges and upstands, the access, and the condition of what lies underneath. It also separates the three routes an owner or managing agent usually weighs, which are repair, overlay and full replacement. A figure for your building can only follow a visit to it.
Why commercial roofs are priced on survey
On a house, a roofer can stand in the road, count the slopes and give a sensible range. On a commercial building that approach fails, because most of what decides the cost is out of sight or specific to the site. The roof may be a single large membrane over a deck, a pitched sheeted roof with a gutter between two spans, or a mix of both grown through successive extensions. The drainage may run to outlets in the middle of the roof, to a parapet gutter (a gully behind a low wall, lined in lead or membrane) or to a box gutter (a rectangular channel running between two slopes). The deck underneath may be sound, or it may be wet insulation over rusted steel.
None of that can be read from the ground. Even a drone photograph shows only the surface, and it cannot tell you whether the insulation below is dry or the fixings still hold. A surveyor has to go up, look at the laps, the outlets, the upstands and the rooflights, and where possible find out how many layers are already on the roof. That is why the safest way to describe commercial roofing prices is that they are set on survey. The ranges below are useful for reading a quote, not for writing one.
Size matters, but not in a straight line. A bigger roof spreads the fixed costs of access, welfare, skips and mobilisation over more area, so the cost per square metre often falls as the job grows. A small roof with awkward access can cost more for each square metre laid than a big, open one with a clear run for deliveries. When a quote seems high, ask how much of it is area and how much is the access, the edges and the preparation.
Typical ranges by roofing system
Published commercial roofing prices are thin. The only figures we have found come from a single contractor's answer on MyJobQuote's question and answer service, dated July 2026. Treat them as low-confidence typical UK ranges, not as a rate card. They are given per square metre, installed, and they exclude scaffolding and the other items discussed below.
| System | Typical UK range |
|---|---|
| Torch-on felt | £80 to £120 per m² |
| EPDM rubber membrane | £90 to £130 per m² |
| Single-ply PVC or TPO | £100 to £140 per m² |
| Extra if new insulation is needed | About £20 to £40 per m² |
Source: MyJobQuote question and answer, 31 July 2026. On a commercial roof the survey is what narrows a wide range into a number you can sign, and the fixed quote we send comes afterwards.
EPDM is a rubber membrane, supplied in very large sheets, which keeps the number of seams low. Torch-on is bitumen felt softened by a gas torch as it is rolled out, normally in two or three layers. Single-ply is the general name for factory-made membranes such as PVC and TPO, welded at the seams. Each has strengths for different buildings, and we compare them on our page about single-ply roofing. The point for cost is that the membrane is only one line in a quote. A cheaper system on a roof that needs new insulation, new upstand details and new outlets can end up dearer than a pricier system on a sound deck.
Repair, overlay or replacement: three different jobs
Owners tend to treat these as three sizes of the same thing. They are three different jobs with different costs, risks and lifespans, and the cheapest route at the start is not always the cheapest over the life of the building.
Repair
A repair deals with a known fault: a split lap, a failed flashing (the strip of metal or membrane sealing a junction), a blocked outlet, a cracked rooflight curb. It costs least and goes quickest, and it is the right call where the remainder of the roof is sound. It is wrong where the leak is a symptom, for example where wet insulation has spread well beyond the visible stain.
Overlay
An overlay lays a new waterproof layer over the existing one without stripping it. It avoids the cost and mess of removal, keeps the building weathertight during the work and can be a sensible way to extend the life of a roof that is sound underneath. It adds weight and traps whatever is already there, so it only suits a roof where the existing layers are dry and firmly fixed. We explain that test in more detail in our guide to whether to repair or replace a commercial roof.
Replacement
A full replacement strips back to the deck, renews the insulation and the waterproofing and resets the details. It costs the most and takes the longest, but it also resets the clock and allows the insulation to be brought up to a modern standard. Where a roof has leaked for years, replacement is often the only way to find out what the deck and insulation look like.
What moves the price up or down
Once the system is chosen, the same handful of factors decide where in a range a commercial quote lands.
- Insulation. The £20 to £40 per square metre in the table above is a reminder that insulation is a separate cost. Wet or crushed insulation has to come out, and a replacement may call for a better-insulated roof. The more of the roof needs new boards, the more the job costs.
- Edges and upstands. Parapets, abutments, verges and eaves are slow, hand-made details. A roof that is mostly open field is cheaper than one with a lot of perimeter.
- Rooflights. Each one needs its curb checked and its flashing renewed. They also create the fragile-roof risk we cover in our guide to fragile roofs and rooflights.
- Drainage. Replacing an outlet or an internal gutter, or adding tapered insulation to improve the fall to it, adds both labour and materials.
- Plant and services. Extract fans, air conditioning units, cable trays and solar mounts all have to be lifted or worked around.
- Access. Scaffold, edge protection, a hoist or a crane for heavy deliveries can be a large line in its own right.
None of these is padding. Each is a genuine task with its own labour and materials, so a quote that lists them one by one is easier to compare than a single lump sum.
Working around a trading business
Roofing is one strand of a commercial job. The business underneath it still has to run, and the way the work is planned can shift the total by as much as the choice of membrane does. Noise, dust, deliveries, a hot-work permit for torch-on and a clear route for the skip all have to be agreed with the occupier. A unit with a loading bay in constant use needs a different plan from an empty one, and a school or care setting needs the work arranged around the people inside it.
Programme is therefore a cost driver too. Working in phases, so that one section of roof is stripped and closed in before the next is opened, costs more in labour than clearing the whole roof in one go, but it protects stock and equipment from the weather. Working in winter, with short daylight and wet decks, slows some systems more than others, and we say more about that in our note on commercial roofing in winter. Our page on working while the business stays open covers the practical side of roof work with the business open.
If a lease is involved, who pays is another question. The tenant, the landlord or a service charge may carry the cost, and the answer can change what scope everyone is willing to approve. The detail is in our guide to roof repairs under a commercial lease.
Energy, survey and reading the quote
A commercial roof is also a major route for heat loss, and a replacement is the cheapest moment to improve it. Adding insulation while the waterproofing is off is far less costly than doing it later, and it can lower heating bills for years. We look at that trade-off in our guide to commercial roof energy. Whether the work is notifiable under Building Regulations is a question for your building control body, which may be B&NES Building Control or a registered building control approver. We help you ask it, because the answer affects the programme and sometimes the specification.
The survey is where each of these unknowns becomes a line on paper. We walk the roof, take photographs of it, record the condition of the membrane, the outlets, the upstands and the rooflights, and note anything that will change the price once the work starts. After that you get one written, fixed price, with every element of the scope itemised. If repair is enough, repair is what we price, as set out on our commercial roofing page. Our written 10-year guarantee covers the workmanship itself.
When you compare quotes, set them side by side against the same checklist: the system and its thickness, what happens to the old layers, the insulation, the edges, the outlets, the rooflights, the access, the waste and the programme. Where a figure is missing from one quote, ask why, and ask what happens if the deck turns out worse than expected once the old layers are lifted. A good quote says how that discovery is priced before it happens, rather than after. A short quote is not always a cheap one. It may simply be the one that has left the difficult parts for later.