Why Your Roof Quote Is Double Your Neighbour's (And When That's Justified)
Same street, same style of house, same roof — so why is your quote £14,000 and theirs was £7,500? Seven genuine reasons the price varies that much, and three signs you are being taken for a ride.
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"But the house next door was half the price"
It is the most common complaint we see about roofing quotes. Two houses that look almost identical from the street get quotes that differ by £5,000–£10,000. Sometimes the higher quote is unjustified — but most of the time it is not. Roofs that look the same from the pavement can be dramatically different the moment you get a ladder up.
Here are the seven legitimate reasons roof quotes vary so much, and the three red flags that tell you a quote has been padded. Read it before you accept the cheaper one blindly.
1. Scaffolding requirements are not negotiable
Scaffolding is the first and largest reason quotes diverge. Working at Height Regulations 2005 require that all work more than roughly two metres above ground has a proper edge-protected platform — no exceptions for small jobs. That means a full scaffold around the perimeter of the work area.
- Semi-detached, one-sided scaffold, one week: £600–£1,100.
- Detached, three-sided scaffold, two to three weeks: £1,400–£2,800.
- Terrace with restricted access: add £300–£700 because the scaffolder has to hand-carry components.
- Road or pavement licence: Kent councils charge £35–£120 for a permit if the scaffold goes over a footpath.
If your neighbour's roof was strip-and-recover and yours is the same job but their access was easier (back-garden reachable with a trailer, yours needs the scaffolder to carry over a high wall), the scaffold alone can add £900.
2. Roof complexity: hips, valleys, dormers
From the pavement, two roofs can look similar. From above, one might be a simple single-pitch gable-end and the other has two hips, three valleys and a dormer — each of which needs flashing, lead work and a lot more labour hours per square metre.
- Simple gable: roughly 30–45 minutes per square metre for strip and re-lay.
- Hipped roof: add 15–25% because the hip tiles and bonnets are cut and bedded.
- Valleys: each valley is 4–8 hours of lead work on a traditional roof, or £120–£220 per metre in GRP.
- Dormers: a single dormer can add £800–£1,600 in cheek tiling, flashing and specialist labour.
Two houses on the same road, built in the same decade, can have wildly different roof geometry — especially in Kent where extensions and loft conversions have been bolted onto 1930s semis over decades.
3. Tile type: slate, clay, concrete
This is where a lot of homeowners get caught out. If your neighbour has concrete interlocking tiles and yours has natural Welsh slate, your roof is not the same job.
| Tile | Typical cost per m² supplied & fitted | Lifespan |
|---|---|---|
| Concrete interlocking (Marley, Redland) | £75–£105 | 40–50 yrs |
| Clay plain tile (handmade) | £125–£180 | 60–100 yrs |
| Imported slate (Spanish, Brazilian) | £95–£135 | 50–80 yrs |
| Welsh natural slate (Penrhyn, Ffestiniog) | £170–£260 | 100–150 yrs |
| Kent peg tile (handmade clay) | £160–£250 | 80–120 yrs |
A listed cottage in Tenterden with handmade Kent peg tiles on oak battens is a completely different job from a 1970s Sittingbourne semi with Marley Modern concrete interlockers. Same surface area, double the material cost, triple the labour.
4. Insulation — the bit no one sees
Building Regulations Part L1B was tightened again in 2022 and is now reflected in every major roof replacement. If you are stripping back to the rafters, the roof must be brought up to modern thermal performance — either above-rafter PIR insulation (Kingspan, Celotex) or equivalent below-rafter build-up.
- Compliant above-rafter PIR on a 100m² roof: £2,400–£4,200 in materials alone.
- Below-rafter insulation with vapour barrier: £1,800–£3,200.
- Skipping it: not possible if the work is notifiable — and Building Control will require a certificate.
If your neighbour had their roof done in 2015, theirs was under older rules with less insulation. Yours in 2026 will be thicker, warmer, and costlier. The price difference is not a rip-off — it is a regulation change.
5. Ventilation and breathable membrane
Modern roofs need cross-ventilation to prevent condensation under the insulation. That means dry ridge systems, soffit vents, over-fascia vents or tile vents, and a breathable underlay (Klober Permo, Tyvek Supro) rather than the old bitumen-impregnated "type 1F" felt.
- Dry ridge system: £30–£60 per metre of ridge.
- Breathable membrane: £180–£320 per 50m² roll.
- Tile vents, soffit vents, eaves comb: £120–£300 total.
A roof re-slated in 2010 on bitumen felt with mortar ridge is a fundamentally different product from a 2026 roof on breathable membrane with a mechanical dry ridge — even though they look similar from the road.
6. Conservation area and planning constraints
Kent has a very high proportion of conservation areas — Canterbury city centre, Sandwich, Tenterden, the high weald villages, Whitstable seafront, the Pantiles in Tunbridge Wells. If your property is in one, or is listed, the tile and slate type may be specified by the council. You cannot simply swap natural slate for concrete interlocking — you need a like-for-like match, which may cost considerably more.
- Like-for-like clay peg tiles: often only available from two or three UK handmade producers. Lead times can be 6–12 weeks.
- Listed building consent: required for any roof work on Grade I or II properties — free but adds 8–12 weeks of approval time.
7. The state of what's underneath
Rafters. Battens. Wallplate. Purlins. Every one of these can be soft, split, woodworm-eaten or simply undersized by modern standards. The quote you receive is based on what the roofer can see until they strip the roof. An honest quote includes a provisional sum for timber replacement — typically £40–£65 per metre of rafter.
If your neighbour's roof structure was sound and yours has spalled wallplate, the extra timber work can easily add £1,500–£3,500 — and that is reasonable. The difference between a good roofer and a scammer is that the good one warned you in the quote.
When the higher quote is actually a rip-off
Not every £14,000 quote is justified. Here are the three signals that you are being overcharged, not over-specified.
- The quote is a single round number, not itemised. A genuine roofer breaks out scaffolding, materials (by line), labour day rate, muck-away, VAT and a provisional sum for unforeseen timber. A padded quote is "Full roof replacement: £14,000 + VAT".
- They refuse to put the specification in writing. "Strip and re-cover like for like" is not a specification. You want tile brand and model, battens size and grade, underlay product, ridge system type, and insulation spec.
- They pressure a decision. "Sign today, the price goes up Monday." Genuine Kent roofers are booked 6–10 weeks out. They are not desperate.
How to compare quotes properly
- Get three quotes minimum. Two is not enough — you cannot tell which is the outlier.
- Insist each quote is itemised with the same scope. If one quote includes insulation upgrade and another does not, they are not comparable.
- Ask each roofer what the provisional sum is for timber replacement. A good roofer gives you an honest worst-case figure.
- Check each is a member of a proper trade body — NFRC, RMI (Roofing Members Initiative) or the CompetentRoofer scheme. Verify membership by phoning the trade body, not clicking a logo on the quote.
- Pay no more than 20% deposit. Balance on completion of the stated scope.
Find a local Kent roofer
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Frequently asked questions
Why would a roofer quote 10 thousand more than another for the same job?
The most common reasons are different specifications being quoted (natural slate vs concrete tile), different scaffolding requirements due to access, one quote including Part L insulation and the other not, or one quote containing a realistic provisional sum for timber replacement while the other assumes the rafters are sound. Always insist on itemised, like-for-like comparisons before deciding.
Is it a red flag if a roofer wants a large deposit?
Yes. Standard practice across the UK roofing trade is a deposit of 10 to 20 percent on job start, with the balance on completion. Some quote a second-stage payment after scaffolding is erected. A demand for 50 percent or more up front, especially in cash, is a signal to walk away — the trader may be using your deposit to finance the materials for the previous customer.
Do I need planning permission for a new roof in Kent?
Planning permission is not normally required for like-for-like roof replacement under permitted development. However you do need Building Regulations approval (handled by the roofer under a competent-person scheme such as CompetentRoofer), and you may need listed building consent or conservation area consent if the property is specifically designated. Many Kent towns — Sandwich, Canterbury, Tenterden and parts of Tunbridge Wells — are within conservation areas where the tile or slate type may be controlled.