Slate Roof Cost Calculator
Slate is the longest-lasting roof covering you can buy — 80 to 100 years for natural slate. This prices it by area and slate type, with the scaffold shown separately.
Open the calculator →Price a slate roof in 30 seconds
4 steps. Covers roof area, slate type, scaffold scope and region.
How this calculator works
Slate is priced per square metre of roof area, and the slate type moves that rate by a factor of two. Fibre cement gets you the appearance at roughly half the price and half the life; Welsh natural slate is the opposite trade and is frequently what a conservation area will require.
The estimate includes new underlay and battens, because re-slating over old battens is a false economy — the battens are usually why the roof is being redone. The one thing it cannot include is structural timber repair, which nobody can see until the covering is off. Agree a day rate and a per-metre rate for rafters before the job starts. It is also worth confirming whether the quote assumes all-new slate or a salvage-and-reuse mix, because the two can differ by thousands on the same roof and are only easy to compare once both are itemised the same way. It helps to know where a full re-slate sits against the alternatives before you commit: our roofing cost guide puts slate next to tile and other coverings on a like-for-like basis, which is the honest way to judge whether the premium for natural slate is worth paying on your roof. And if only part of the roof has failed, price the localised fix too — the roof repair cost calculator covers slipped and broken slates, which on an otherwise sound roof is often all that is actually needed.
Slate roof costs by region (2026)
| Region | Typical 2026 cost | Notes |
|---|---|---|
| London | £13,000–£17,500 | Typical 3-bed semi |
| South East | £12,000–£16,000 | |
| South West | £10,800–£14,400 | |
| Midlands | £10,200–£13,600 | The national baseline |
| Scotland | £9,900–£13,200 | |
| North West | £9,600–£12,800 | |
| Yorkshire | £9,600–£12,600 | |
| Scaffold (front and rear, 3 weeks) | £1,350 | Included above |
Ranges match our slate roof cost guide and assume a typical 70m² semi in natural slate.
Slate roof calculator FAQs
Natural slate is 80–100 years and Welsh slate often beyond that. Fibre cement is 30–50. In practice the slate usually outlives the fixings and the underlay beneath it — which is why old slate roofs are frequently stripped, re-battened and re-laid with much of the original slate reused.
Often, yes. A good roofer will sort the stripped slate and typically salvage 60–80% of it on a sound roof, buying in reclaimed to make up the difference. That can save meaningfully on materials — ask for it to be priced as an option. Reused slate has to be sorted for soundness first, so expect the labour line to be a little higher even as the materials line drops; the net saving is real but usually smaller than the headline salvage percentage suggests.
On a budget, or where the roof structure cannot take the weight of natural slate, yes. It looks convincing from the ground. Just budget on a 30–50 year life rather than 80–100, and check what a conservation area requires before choosing it.
Structural timber repair, almost always. Rotten rafters or a sagging ridge only become visible once the covering is off. Agree the rate for that work up front — it turns an argument into a variation. The same goes for chimney leadwork and any valley or abutment flashings: ask whether they are in the number or priced separately, because on an older slate roof they usually need renewing at the same time and are a common source of a surprise on the final bill.
Related cost guides
- Slate roof cost guide — full 2026 pricing by region
- Roof cost calculator — compare all coverings
- Tile roof calculator — the cheaper alternative
- Scaffolding calculator — price the access
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