Roofer's Quote - Red Flags That Could Cost You Thousands

Roofing is where homeowners are most vulnerable. You can't see the work from the ground. You can't easily check it yourself. And the consequences of a bad job - leaks, structural damage, thousands in repairs - might not show up for months or years.

That's why roofing attracts more rogue traders than almost any other building trade. Most roofers are honest, skilled professionals. But the cowboy-to-qualified ratio is higher on roofs than anywhere else in home improvement.

Your best protection? A detailed, written quote that nails down exactly what's being done, what it costs, and what guarantees come with it.

What a good roofer's quote looks like

A proper roofing quote should read like an instruction manual for the job. Every element of the roof should be listed, described, and priced. No ambiguity.

For a full re-roof (strip and re-tile), that means:

• Strip existing tiles and felt down to the rafters (the timber beams that form the roof structure)
• Inspect rafters and replace any damaged timbers (with a provisional allowance or per-metre rate for replacements)
• Install breathable roofing membrane (the modern replacement for traditional felt - it lets moisture escape from the roof space while keeping rain out)
• Install new treated softwood battens (the horizontal timber strips that tiles hang from) at specified centres
• Supply and fix new tiles - type, colour, and manufacturer named (e.g. Marley Edgemere in Smooth Grey, or Redland 49 in Farmhouse Red)
• Ridge tiles (the tiles along the very top of the roof) - dry ridge system or mortar-bedded, specified
• Replace lead flashing (the waterproof strips where the roof meets walls, chimneys, or other roofs) - Code 4 lead to specified areas
• Hip tiles or valley gutters if applicable
• Replace or re-line guttering and downpipes - material and size specified (e.g. half-round PVC, 112mm)
• Scaffolding: included/excluded, who provides it, and for how long
• Skip hire: number of skips and whether included in the price
• Clean up and removal of all waste materials
• Timeline: expected duration and start date

For a flat roof replacement, you should see the membrane type named - EPDM rubber, GRP fibreglass, or torch-on felt - along with the insulation type and thickness, the falls (gradients that ensure water drains off rather than pooling), and the edge trim detail.

If you've never assessed a trade quote before, our guide on how to read a builder's quote explains the structure and what each section should tell you.

What roofing work costs in 2026

These are typical UK prices outside London. Add 15–25% for London, 10–15% for the South East.

Tile type drives the biggest cost difference. Concrete interlocking tiles are the cheapest at roughly £30–£40/m². Plain clay tiles are double that. Natural slate can be three to four times the cost.

Roof shape matters too. A simple gable-end roof (two sloping sides meeting at a ridge) is straightforward. Hipped roofs (sloping on all four sides), dormer windows, and multiple valleys all add labour and materials.

Red flags that should stop you signing

Doorstep cold-callers

If someone knocks on your door saying they've noticed damaged tiles, or they're "working in the area" and can do your roof at a discount - do not engage. This is textbook rogue trader behaviour.

Legitimate roofers don't need to knock on doors. They're booked weeks or months in advance through recommendations and repeat business. Politely decline. Close the door. If they persist, report them to Trading Standards.

Quoting without a proper roof survey

A roofer who quotes from the ground - or from a quick look at Google Earth - is guessing. You can't assess a roof from the pavement.

A proper survey means inspecting the tiles close up, checking felt and battens from inside the loft, assessing flashings, examining ridge and hip tiles, checking guttering, and looking at the timber structure for rot or sagging. If the roofer hasn't been on the roof or in the loft, the quote is a finger-in-the-air estimate that leads to "extras" once work starts.

No scaffolding mentioned

This is the red flag that costs homeowners the most money. Scaffolding is expensive and easy to forget about.

For anything beyond a minor repair, roof work requires scaffolding. It's a legal requirement under health and safety law. Roofers can't just lean a ladder against the eaves and crack on.

Scaffolding hire for a typical semi runs £800–£1,500 for two elevations. A detached house needing three or four sides can hit £1,500–£3,000. Hire periods are usually 4–6 weeks, with extensions charged weekly.

If the quote doesn't mention scaffolding, ask whether it's included. If the roofer says they won't need it - for anything other than a ground-floor flat roof - get a different roofer.

Vague "as needed" repairs

"Repair timbers as needed - charged at day rate" sounds reasonable. It's not. It's an open-ended cost with no cap, no estimate, and no accountability.

A good roofer can assess the likely condition of battens and rafters during their survey. They should give you either a fixed allowance (e.g. "includes up to 20 linear metres of batten replacement") or a provisional sum (e.g. "£500 provisional allowance for timber repairs, actual cost confirmed once tiles are stripped").

"As needed" with no limit is how a £7,000 re-roof becomes an £11,000 re-roof with no warning.

Pressure to pay a large deposit immediately

"If you sign today, I can start next week and knock 15% off." Classic high-pressure sales tactic. Legitimate roofers don't need to pressure you into instant decisions.

A reasonable deposit is 10–15% to cover materials ordering. Some roofers don't ask for any deposit at all. Anything over 25% upfront is a red flag. Full payment before the work starts is a dealbreaker.

If you're worried about how much to pay and when, our post on builders changing price after starting work covers how to protect yourself from cost creep - the same principles apply to roofing.

No guarantee details

A good roofer should offer a workmanship guarantee - typically 10–20 years for a full re-roof. This is separate from the manufacturer's tile warranty, which can be 30 years or more.

A verbal guarantee means nothing. It needs to be in writing, stating what's covered, and ideally backed by an insurance-backed guarantee scheme (like the NFRC - National Federation of Roofing Contractors - or TrustMark). That way, if the roofer goes out of business, your guarantee is still valid.

If the quote doesn't mention guarantees, ask. If the roofer says "I guarantee my work" but won't put it on paper, that should concern you.

What's often missing from roofing quotes

Scaffolding cost

Worth repeating because it's the single most commonly omitted item from roofing quotes. It can represent 15–25% of the total job cost. Make sure the quote either includes scaffolding in the total price or lists it as an explicit exclusion with an estimated cost.

Skip hire and waste disposal

Stripping a roof generates a lot of waste. Old tiles, broken battens, torn felt, damaged lead - it all has to go somewhere. Two or three large skips at £250–£350 each is typical for a full re-roof.

Some roofers include waste disposal. Others don't. If the quote says nothing about skips or waste removal, clarify it before work starts.

Building control for structural changes

If the roofing work involves any structural alterations - adding a dormer, changing the roof pitch, converting a flat roof to pitched, or increasing the roof loading by switching from lightweight tiles to heavy slate - Building Regulations approval is needed.

Even a straightforward re-roof might trigger building control if you're changing more than 25% of the roof area, as insulation must be upgraded to meet current Part L (energy efficiency) standards.

The roofer should know whether building control is needed. If they don't mention it, ask. Our post on warning signs your builder is overcharging covers why missing details like this matter.

Temporary weather protection

Once the old tiles are off, your home is exposed. If it rains - and this is the UK, so it will rain - everything below is at risk.

Good roofers have tarpaulins and temporary sheeting ready to deploy at the end of each day or when weather turns. This should be mentioned in the quote. If it's not, ask what happens if it rains mid-strip. Homeowners have suffered thousands in water damage because there was no protection in place between working days.

How to compare roofing quotes

Roofing quotes are harder to compare than most trades because the scope varies so widely. Here's how to do it properly.

Match the scope exactly. Is everyone quoting strip and re-tile, or overlay (fitting new tiles over existing ones - cheaper but not always appropriate)? New battens and membrane, or reusing existing? Lead flashings replaced or patched? Line up the scope side by side.

Separate the scaffolding. If one quote includes scaffolding and another doesn't, adjust before comparing. It's a big enough cost to swing the whole comparison.

Check the tile spec. Redland 49 concrete interlocking tiles at £35/m² will be thousands less than handmade clay at £80/m². Make sure you're comparing like with like.

Ask about the team. A sole trader will take two to three weeks. A team of four will finish in five to seven days. Longer duration means more scaffolding hire and more exposure to weather.

Verify credentials. Check for NFRC membership, TrustMark registration, or Competent Roofer scheme (a competent persons scheme letting roofers self-certify Building Regulations compliance). These come with dispute resolution, insurance-backed guarantees, and regular inspections.

Before you pay the final invoice, check the work against our roofing inspection guide.

Get a benchmark before you commit

Roofing prices vary wildly and most homeowners have no frame of reference. Use our free cost estimator to get a realistic ballpark for your specific roof type, property size, and location before you start collecting quotes.

If you've already got a quote sitting in your inbox, upload it to MyBuildAlly and we'll check the pricing against regional benchmarks, flag missing items like scaffolding and guarantees, and tell you whether the scope looks complete. It takes a couple of minutes - and for a job where the stakes are this high, that's time well spent.