Commercial Roofing Quotes, Compared Line by Line
Holding two or three commercial roofing quotes that do not add up? The gap is usually scope, not price: one quote strips a wet deck and upgrades the insulation, another overlays it and leaves the problem in place. Enter the totals and the roof area, and the sense-check shows the price per square metre of each quote and the scope lines each roofer still has to state.
- Independent publisher
- No rate card, your own figures
- Six scope lines
- We reply by email
- Price per m² of every quote, worked from your figures
- The scope lines that explain the gap between quotes
- Part L, asbestos, CDM and work at height, cited to the source
- How to check each roofer on the official registers
Why two quotes for the same roof differ so widely, and how to read them
A facilities manager rarely struggles to find a roofer. The struggle is the pile of quotes on the desk — three numbers for the “same” roof, thousands apart, with no honest way to tell which is comparing like with like. The gap is almost never the price of the work. It is the scope. One firm strips a wet deck and rebuilds a warm deck to a Part L U-value under a 25-year single-point manufacturer guarantee; another overlays the existing roof, leaves the condensation problem in place, and offers a workmanship promise. The headline numbers look comparable and the work behind them is not.
A commercial roof is read from the deck up, not chosen from a price list, and a quote is only comparable once the specification is fixed. Before any rate per square metre means anything, five things have to be on the page:
- The system, and why. Single-ply, built-up felt, liquid, profiled-metal cladding, slate, tile, an overlay or a coating — each is right in a specific set of conditions set by the deck, the falls and the loads, not by a brand or a headline price.
- The falls and drainage design. On a flat roof, BS 6229:2025 sets a minimum finished fall of 1:80; a roof that ponds was never laid to fall, and ponding voids guarantees. A quote that is silent on falls is silent on whether the roof will drain.
- The build-up and the U-value. Renewing a significant area triggers a Part L thermal-element upgrade, typically to around 0.18 W/m²K on a re-roof. An overlay that skips it may not be lawful, and will not perform.
- The guarantee — type and term. A single-point or insurer-backed manufacturer guarantee is a different thing from a workmanship promise. Ask for the number of years and whether the cover survives any one firm ceasing to trade. Never accept a “lifetime guarantee”; a guarantee is always bounded by a term.
- What it excludes. Access and edge protection for working over a live building, asbestos survey on pre-2000 stock, gutter and rooflight work — the cheap quote is often cheap because these sit in the exclusions.
Ask every roofer to survey first and set out every option against that checklist — so the numbers on your desk finally mean the same thing.
What makes one commercial roofing quote dearer than another
We do not print a rate card: there is no free, dated, published source of commercial roofing rates we can cite, and a borrowed range would give you a number to anchor on and nothing to check it against. The useful numbers are on your quotes. Divide each total by the area it covers, then explain every gap with a line of scope.
The lines that move the price most are the condition of the deck and insulation (wet insulation has to come off), the insulation upgrade a large re-roof normally needs under Part L, the falls on a flat roof that ponds, access and fragile-roof protection over an occupied building, wind exposure and fixings, asbestos on older buildings, the gutters and rooflights, and the type of guarantee. Our cost guide sets each one out with the question to ask, and the repair, refurbish or replace guide covers the whole-life decision.
Three quotes for one warehouse roof: a coating, an over-sheet and a re-clad
Three quotes for the same leaking profiled-metal roof can look like a bidding war when they are three different jobs. The worked example shows how to read the fault first, put the quotes on one basis and compare them on the six scope lines. It is an illustration of the method, not a real building or client, and it uses no prices.
Read the worked exampleFive steps from a pile of quotes to a decision you can defend
- Send one brief to every roofer. The building, the roof area and type, what the roof is doing now, any plans such as rooftop solar, and the access constraints.
- Expect an inspection before a firm price. Core samples or opening-up to check for wet insulation, a look at the gutters and cut edges, and on buildings from before 2000 an asbestos refurbishment survey before intrusive work.
- Put every quote on one basis. Same area, gutters as a separate line, provisional sums noted, access added back in.
- Compare the six scope lines, then the price. System, falls, insulation and U-value, guarantee, access and exclusions. The sense-check lists the lines each quote is missing.
- Check each firm on the registers it claims. Our accreditations page explains NFRC, CompetentRoofer, SPRA, LRWA, CHAS and SafeContractor, and how to check each one.
Building Regulations, guarantees and the honest funding position
A commercial re-roof or re-clad is notifiable building work when more than 50% of the roof surface is renewed, or more than 25% of the whole building envelope is renovated — which catches most full jobs. That triggers a Part L thermal-element upgrade, so the insulation is brought up to current standards, typically around 0.18 W/m²K on a re-roof, with compliance by calculation rather than one fixed number. Where the roofer is CompetentRoofer-registered, that contractor can self-certify the work and issue a Building Regulations Compliance Certificate — the document you will need at a sale, lease event or insurance review — instead of a separate Local Authority Building Control application. Fire performance matters too: coverings are specified to the right external fire rating (Broof(t4) to BS EN 13501-5 near a boundary) under Part B, and working at height over a live building is managed under the Work at Height Regulations 2005 and CDM 2015, on which the building owner carries the Client duties.
On funding, be clear-eyed. Commercial roofing is overwhelmingly capital works and planned maintenance — there is no general public grant that re-roofs a commercial building, and any site advertising a “roofing grant” should be treated with suspicion. The legitimate angles are tax treatment: standard-rated 20% VAT recoverable by a VAT-registered business, and capital allowances on the insulation element of a warm-deck or insulated-panel upgrade — all matters for your accountant, never a blanket promise from us. See the full picture in our funding notes.
Authority references: Approved Document L, NFRC and CompetentRoofer.
Compliance is designed into the quote, not bolted on
What building owners ask before comparing quotes
The questions facilities, estates and property managers actually ask before a repair, refurbishment or re-roof.
Why do commercial roofing quotes vary so much for the same roof?
Because they are rarely quoting the same scope. One firm strips a wet deck and rebuilds a warm deck to a Part L U-value with a 25-year single-point manufacturer guarantee; another overlays the existing roof, leaves the condensation problem in place, and offers a workmanship promise. The headline numbers look comparable and the work behind them is not. Ask every quote for the system, the build-up, the falls design, the guarantee type and term, and what it excludes, then you are comparing like with like. More on our cost guide.
What does a commercial roof cost per square metre?
There is no free, dated, published source of commercial roofing rates we can cite, so we do not give one. The rate on a real quote is set by the deck, the insulation upgrade, the falls, access over the building and the guarantee. Divide each quote's total by the area it covers to compare them, and use the cost guide to explain the gaps.
Should I repair, refurbish or replace my commercial roof?
Repair where the failure is localised and the deck, insulation and falls are sound. Refurbish — overlay, over-clad or coat — where the substrate is sound and dry but the covering is tired, and you want to defer capital cost honestly. Replace where the insulation is wet, the roof ponds because it was never laid to fall, the deck is failing, or reactive patching has become an annual cost that never fixes the fault. The honest test is whole-life cost, and a survey gives you all three numbers. Work through it on our repair-or-replace guide.
Can my commercial roof carry solar panels?
Often yes, but only after a survey confirms the roof can take the load and has enough life left to justify it. A ballasted or fixed array adds roughly 15 to 25 kg/m² of dead load in typical conditions — more, up to around 30 kg/m², on exposed or high-wind roofs — plus wind uplift, and it sits on the roof for 25 years or more. Putting an array on a tired roof means lifting it again to re-roof underneath within a few years, so where solar is planned the right sequence is to survey and, if needed, re-roof first.
Is there a grant for commercial roofing?
In the general case, no. Commercial roofing is capital works and planned maintenance, and there is no public grant scheme that pays to re-roof a commercial building. Any site advertising a "roofing grant" should be treated with caution. The legitimate financial angles are tax treatment, 20% VAT that a VAT-registered business recovers, and capital allowances on the insulation element of a warm-deck or insulated-panel upgrade — all matters for your accountant. See our funding notes.
Commercial roofing quotes across the UK
Local notes on the ageing industrial-estate and civic building stock in each area. Pick a location for local detail, or see every area guide.
London
Greater London. 8,908,081 population. Industrial-estate, retail and civic roof stock.
Birmingham
West Midlands. 1,141,816 population. Industrial-estate, retail and civic roof stock.
Leeds
West Yorkshire. 793,139 population. Industrial-estate, retail and civic roof stock.
Sheffield
South Yorkshire. 584,853 population. Industrial-estate, retail and civic roof stock.
Manchester
Greater Manchester. 568,996 population. Industrial-estate, retail and civic roof stock.
Bradford
West Yorkshire. 546,412 population. Industrial-estate, retail and civic roof stock.
Quote sense-check and enquiry
Compare your commercial roofing quotes
Enter the roof area and up to three quote totals for an instant indicative read. If you want a written view, send the form and we reply by email.
- Instant indicative read. Enter the roof area and the totals on the quotes you hold: the form works out the price per m² of each quote, the gap between them, the total with VAT and the scope lines each quote still has to state.
- Nothing is calculated from a rate card. Every number in the read comes from your own quotes; the only fixed figure is VAT at the 20% standard rate.
- We reply by email. Send the form if you want a written view of the comparison or help with what to ask each roofer.
Who reads this form: Commercial Roofing Quotes is an independent publisher run by SEO Dons Ltd. We do not survey, price or install roofs, we hold no roofing trade accreditations, and we do not pass your details to a roofing contractor. Your enquiry is read by us and we reply by email.