Roofing prices reflect a dangerous job done by a shrinking pool of people, with mandatory safety equipment and insurance priced against the risk. Most of what looks like a premium is cost, not margin.
The work is measurably dangerous
Falls from height caused 31 of the 126 worker deaths in Great Britain in 2025/26. Construction had the highest fatality count of any industry at 25 deaths, and falls from height accounted for nearly half of those, at 12. Roof work is roughly a quarter of construction deaths.
Those are absolute counts from HSE, not an industry estimate. They are also the reason the rest of this answer exists: almost every other cost driver in roofing traces back to keeping people off the ground safely.
Insurance prices that risk
Public liability cover starts around £200 to £1,500 a year at the basic end, but for roofing it runs to £1,800 to £2,500 for sole traders, £2,500 to £4,000 for small firms, and £4,500 to £6,000 or more for larger contractors. Working at height is a primary rating factor. Those are annual business premiums rather than quoted prices. They reach you inside the labour rate rather than as a VAT-able line on your bill.
This is the real explanation for the quote that comes in 40% below everyone else. A roofer who is not carrying cover has a materially lower cost base, and the exposure that creates is worth stating precisely rather than luridly.
The safety duties themselves do not land on you. Under regulation 7 of the Construction (Design and Management) Regulations 2015 a domestic client's duties pass to the contractor, and the Work at Height Regulations 2005 bind the employer or the self-employed person carrying out the work. Hiring an uninsured roofer does not make you responsible for planning their safety.
What it removes is the money behind a claim. If a slate comes off the scaffold into your roof, a neighbour's conservatory or a passer-by on the pavement, there is no insurer standing behind that damage, and no fund to satisfy a judgment if you win one. An uninsured sole trader with no assets is a defendant you can beat and still recover nothing from. Ask to see the certificate, check it names the exact company you are contracting with, and check the policy dates span your whole project.
Safe access is a cost, not an upsell
The Work at Height Regulations 2005 require work at height to be properly planned, supervised and carried out by competent people using suitable equipment. They do not name scaffolding, and a tower or a powered access platform can satisfy them on smaller jobs. But a full re-roof means days of working across the whole covering, and on a London terrace the practical answer to that is a scaffold. It is a cost of doing the work safely rather than a line item a roofer chose to add.
It also carries its own compliance overhead. Scaffolds must be inspected after installation and before first use, then at intervals of no more than seven days. A useful homeowner check: ask to see the scaffold handover certificate and the seven-day inspection records. They are documents a compliant contractor has and a cowboy does not.
There are not enough roofers
The FMB's State of Trade survey found 32% of firms struggle to hire roofers with the necessary skills, up from 21% in Q4 2024, the second hardest trade to recruit after carpenters. Seven in ten FMB members say skills shortages restrict the work they can accept.
A trade that cannot recruit is a trade whose existing people can pick their jobs and set their price. This is the cost driver that is currently getting worse rather than better.
London costs more than the rest of the country
The trade figures in this section come from published cost guides and exclude VAT; the borough licence at the end is a council fee. Waste is the clearest example. A six-yard skip is £290 to £400 in London against £190 to £245 in the north, and a re-roof needs one or two of them. Stripping the old roof costs £1,000 to £2,500 before a single new tile goes on.
Access equipment shows the same gradient more sharply. A four-metre scaffold tower costs about £600 in London, £400 in Colchester and £250 in the North East. Add the borough licence for scaffolding over a pavement, typically £150 to £600 in inner London.
Fixed prices carry the weather risk
Most roofers quote per job rather than per day. That means the contractor absorbs the rain days while still paying for scaffolding and wages. That risk is priced into the quote you receive. It is why the fixed number, though it looks higher, is usually the safer one for you.
The one reason you should not accept
"Material prices are rising, so book now" is not supported by the data for tiled roofing.
Construction materials were 43.4% higher in November 2025 than in February 2020, which explains why roofing feels so much dearer than it did pre-pandemic. But in the twelve months to March 2026, the all-work materials index rose only 2.6%, and concrete blocks, bricks, tiles and flagstones fell 3.4%, with cement down 3.1%.
Tile materials got cheaper over that year. Urgency framed around rising material costs is a sales technique, not a fact. Take the time to get three comparable quotes.
Insurance is the cost a cowboy skips, so it is worth starting from a checked list.