Question answered
What is the most expensive part of replacing a roof?
The short answer
On most houses the largest share of a re-roof goes on the new covering and the skilled labour to fit it. Scaffolding is a sizeable cost of its own, and the condition of the timbers is the one factor nobody can see until the old roof is off. Roof size, shape, chimneys and access then raise or lower all of them. We explain these factors and give one total price after the survey.
On most houses the covering and the labour to fit it carry the biggest share, with scaffolding next and the timbers underneath as the unknown. Here is how each factor moves the price and why one total figure follows the survey.
Covering and labour carry the weight of the price
The material you choose sets the baseline. A guide from MyBuilder (updated 21 August 2026) puts typical UK re-roof prices for slate at £100 to £180 per m², while its labour range is £50 to £130 per m², with £250 to £300 quoted as a day rate. Concrete tiles are usually cheaper to buy, clay plain tiles and natural slate cost more, and stone slate more again.
Labour follows the covering. Small plain tiles and slates take far longer to lay than large interlocking tiles, and every hip, valley and dormer cheek means cutting, lead and time. A bungalow with a simple gable can cost noticeably less than a hipped house of the same floor area, because the roof has less detail even where it is just as wide.
Because those two items depend so heavily on your own roof, any number quoted without a survey is a guess. The survey is what turns a national range into a price for your house.
Scaffolding is a cost that does not shrink with the job
A re-roof needs safe edge protection and a working platform along every side being worked, which means a full scaffold. For a standard two-storey house, typical UK guides give around £850 to £1,200 (MyBuilder, updated 21 August 2026), and Checkatrade (October 2026) gives £700 to £1,300 for a re-roof scaffold, before VAT where stated.
The figure moves with the height of the eaves, the length of the elevations, ground that is sloping or soft, and whether the council's permission is needed for scaffold over the pavement, which the scaffold firm arranges. A chimney can add a lift. A terraced front on a busy road is dearer to scaffold than a detached house on a quiet close, because of the protection and the traffic around it.
When two quotes for the same roof look far apart, the first thing to compare is what each one allows for scaffold and VAT. A gap there can account for more of the difference than the roofing itself.
The timbers underneath are the unknown
The roof structure cannot be fully judged until the covering is lifted. Rafters, purlins, the wall plate on top of the walls and the battens can all hide rot or insect damage, and repairing them costs extra timber and carpentry time. Houses of the same age and style differ here, because a leak that ran for years damages the timber it ran over.
That is why a careful survey looks for the signs from inside the loft first: staining, soft spots, light where there should be none and sagging lines. Nobody can promise that nothing will turn up, so we tell you what we saw and what would change the price if the strip-out showed more. Timing is affected too, as how long a roof replacement takes explains.
Size, shape and access change every other figure
MyBuilder's guide shows how much shape alone matters. On a semi-detached house the guide shows typical UK figures of £5,000 to £8,000 under a gable roof against £8,000 to £12,000 under a hipped one. The extra edges of a hipped roof, with more ridge to fix and more cutting, push the price up before any material choice.
Access matters as well. A house with no room for a skip or a delivery lorry means more handling by hand, and a roof reached along a narrow side passage takes longer to load and clear. Chimney stacks, roof windows and flat-roofed bays each add their own flashing and weatherproofing work. Those details are where a re-roof with a low headline per-metre figure can still arrive at a higher total.
Doing one slope rather than the whole roof saves materials and labour, but scaffold and set-up do not halve with it: replacing one side of a roof covers the sums.
Where you can save without cutting corners
The dependable ways to keep the total sensible are the unglamorous ones. Reusing sound tiles saves on the covering, although it needs a careful check first, as explained in reusing old roof tiles. Having the fascias, gutters and chimney leadwork done while the scaffold stands avoids paying for access twice. Starting while the timbers are still sound is cheaper than starting after years of damp have spread.
Listed and conservation-area houses can add cost because the covering must match, which is covered in re-roofing a listed or conservation-area home. Our written quote comes as one total price, with photographs from your own survey behind it, and you can ask us to talk through what drives each part of it. The wider picture of the work sits on the roof replacement page.
Cost drivers worth a second look
Is the scaffold the dearest item on a house re-roof?
Rarely the dearest, but a large fixed cost that does not scale down with a small job. Typical UK guides give roughly £700 to £1,300 for a standard house, depending on height and the length of the elevations. Ask any roofer whether the scaffold sits inside the price you are shown.
Can the price change after the old roof comes off?
It can if the timbers turn out worse than the loft survey showed. We photograph what we find, explain it, and agree any change with you before extra work starts. A thorough survey of the loft beforehand makes surprises less likely, though nobody can rule them out entirely.
Tell us about your roof
Describe what is happening and we will call you back to arrange a visit.
- Photographs of what we find
- A written quote with one total price
- Or call 01903 299063
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