Asking “how much for a new roof?” is a bit like asking how much a kitchen costs. The honest answer is “it depends.” But that isn’t much use when you’re trying to budget. This guide breaks down what actually drives the price of a full re-roof in Orpington and Bromley. That way, you can read a quote with confidence, rather than just hoping it’s fair.
What a full re-roof typically costs
Price is usually quoted per square metre of roof area, since the material you choose makes the biggest difference. According to Checkatrade’s roof replacement cost guide, concrete tile re-roofs typically run around £85-£170 per m².
That figure includes labour, battens and membrane. Clay tile tends to sit higher, at roughly £110-£210 per m². Natural slate is the most expensive option, at around £140-£280 per m².
For a typical three-bedroom semi, that means a whole-roof job costs somewhere around £6,500-£11,500 for concrete tile. It rises to £9,500-£15,500 for clay, and £11,000-£18,500 for natural slate.
Those figures are useful as a starting point. But they’re ranges, not fixed prices, because so much depends on the individual property. A simple, single-pitch roof with easy access will land at the lower end.
A steep Victorian roof with multiple valleys, chimneys and dormers will push towards the top, or beyond it. That’s why a proper site visit matters more than a phone-quote ever can.
The three costs behind the headline price
Scaffolding and access
Scaffolding is rarely optional on a full re-roof, both for safety and for the quality of the finished job. Checkatrade puts typical scaffolding costs at roughly £700-£1,500 for the duration of the work. A terraced property with restricted rear access will sit at the higher end.
So will a roof that needs scaffolding on all four elevations. Additionally, waste disposal for the stripped-off old roof covering — tiles, felt and battens — generally adds another £200-£600.
Tear-off versus over-roofing
A tear-off re-roof strips everything back to the rafters and replaces any rotten timber. It then fits a new breathable membrane and battens, before re-covering with new or reclaimed material. An over-roof, by contrast, leaves the existing structure in place and builds a new covering on top.
It’s cheaper up front. But it only works where the existing deck and timbers are sound, and it isn’t suitable for every roof type. On a period property in Orpington with older timber, a full tear-off is usually the safer route. That’s because it’s the only way to actually see and fix what’s underneath.
What roofers find once they start
The single biggest reason a re-roofing quote changes mid-job is hidden timber damage. Once the old covering comes off, it isn’t unusual to find sections of rotten batten or rafter, since these weren’t visible during the initial inspection.
This is especially common around chimneys, valleys and eaves, where water has been getting in slowly for years. A reputable contractor will price this as a clearly itemised variation, rather than bury it in the final invoice. Ask for that commitment before work starts.
Do you need planning permission?
For most homeowners in Orpington and Bromley, the answer is no. Re-roofing that doesn’t materially change the external appearance normally counts as permitted development. A like-for-like tile or slate replacement is a good example.
This is set out by the Planning Portal. Still, this changes in some cases. Altering the roof’s height or shape is one.
Adding rooflights that project beyond the permitted limits is another. So is a home in a conservation area, or one that’s listed. In that case, an Article 4 Direction can remove those automatic rights.
Building regulations are a separate matter from planning permission, and usually apply regardless. They cover things like insulation standards and structural work. As a result, it’s worth checking both before work starts. Don’t assume a straightforward swap needs no sign-off at all.
How to get a fair quote
A fair quote should be itemised, not a single lump figure. Ask for the price broken down into materials, labour, scaffolding, waste removal, and any allowance for unexpected timber repair, since that’s the only way to compare two quotes on equal terms.
It also helps to check that the roofer is appropriately vetted. Membership of a body like the Federation of Master Builders means the firm’s trading history, insurance and workmanship have already been checked. That takes some of the guesswork out of choosing who to trust with a job this size.
As a starting point, it’s worth getting quotes from more than one contractor. Ask each one the same questions, about tear-off versus over-roofing, scaffolding included, and what happens if hidden damage is found. Our re-roofing team surveys properties across Orpington, Bromley and St Mary Cray. We provide a free, itemised site visit before any figure is put in writing.
Summary
A new roof is a significant spend, but it doesn’t need to be a mystery. Material choice, scaffolding, and what’s hiding under the old covering are the three things that move the price most. Planning permission, meanwhile, is rarely the obstacle people assume it will be.
If you’d like a clear, itemised figure for your own roof, get a free quote. We’ll talk you through exactly what’s included.
