Comparing costs of slate versus concrete roof tiles

Start with the short answer

If you are re-roofing a typical UK home, concrete tiles will almost always win on the initial quotation. They are cheaper to buy, quicker to lay and available from any builders' merchant. Natural slate costs considerably more before a single batten goes down. But a roof is not a one-off purchase — it is a hundred-year decision, and that changes the arithmetic entirely. This guide sets out the realistic numbers, then looks at how the same logic applies to stone flooring and the wider business of maintaining an older British property.

The upfront cost: slate versus concrete, in real numbers

Prices vary by region and by the type of slate, but here is what most homeowners should budget for in 2024 terms.

• Concrete interlocking tiles: £25–£45 per square metre for the tiles alone, rising to roughly £70–£110 per square metre laid, including battens, membrane, fixings and labour.
• Natural slate (Welsh or imported): £60–£120 per square metre for the slate, and typically £150–£250 per square metre fully installed.
• Reclaimed or diminishing-course slate: often more again, because each course must be graded and cut by hand.

On a three-bedroom semi with around 70 square metres of roof covering, that usually means £6,000–£9,000 for concrete and £13,000–£20,000 for natural slate. Scaffolding, which can run to £1,500–£3,000 on a two-storey house, applies to both and is worth pricing separately. Concrete tiles are also heavier than most slates, so check your roof structure if you are switching from a lightweight covering — a structural engineer's report may add a few hundred pounds.

Lifespan and the cost of re-roofing again

Here is where the gap narrows. A good-quality concrete tile carries a manufacturer's guarantee of around 30 years and will often last 50. Natural Welsh slate is routinely expected to give 100 years, and plenty of Scottish and Cumbrian roofs are still sound at 150. Imported slate from Spain or Brazil is softer and may give 40–60 years, so ask what you are actually buying rather than assuming "slate" means forever.

Spread over its service life, natural slate often works out at £1.50–£2.50 per square metre per year, against £2–£4 for concrete. Add the disruption of a second re-roof in 2075 — scaffolding, skips, a fortnight of noise — and the cheaper option starts to look less cheap. A slater will also tell you that individual slate repairs are straightforward: hook out the broken slate, slide in a replacement, re-nail. Matching a weathered concrete tile twenty years on is often impossible because the profile has been discontinued.

Appearance, planning consent and resale value

In conservation areas, on listed buildings, and anywhere an Article 4 direction applies, natural slate is frequently the only acceptable covering for a visible slope. Councils can and do refuse concrete on the wrong building. If you are in a stone-built village in the Cotswolds, Pennines or Highlands, matching the existing roof is not vanity — it is what planners and neighbours expect.

Estate agents will tell you the same thing from the other direction. A chartered surveyor's report noting "roof covering original, in sound order" reads very differently to one flagging "tiles approaching end of serviceable life". Buyers notice. On a period property in particular, a well-executed slate roof tends to hold value in a way that a generic concrete roof does not.

Stone flooring follows the same logic

The pattern repeats indoors. Natural stone flagstones or limestone typically cost £50–£90 per square metre for the material and £100–£160 laid. Porcelain or ceramic substitutes come in at £25–£45 supplied and £60–£90 laid. But natural stone can be lifted, cleaned and relaid; it takes a patina that improves with age, and it suits the breathability of a traditional building. Porcelain is more practical in a wet room and never needs sealing.

In older cottages, flagstones were traditionally bedded on lime ash over compacted earth, allowing moisture to move. If you replace them with a sealed concrete base and a waterproof membrane, you may push damp into the walls instead. Where floors must stay breathable, use lime-based bedding and a vapour-permeable finish, and avoid anything described as a "sealer" on old stone. Clean with a pH-neutral product and a soft brush, never a pressure washer.

A sensible maintenance routine for traditional roofs and floors

Whichever covering you choose, the annual routine matters more than the specification. Budget £200–£400 a year for a older property and you will rarely face a crisis.

• Inspect the roof from ground level with binoculars each spring and autumn; check for slipped slates, ridge mortar and flashing around chimneys.
• Clear gutters, hoppers and valley gutters twice a year — blocked water causes more damage than wind.
• Cut back overhanging branches; moss thrives in shade and lifts slates as it grows.
• Sweep and check the chimney annually if it is in use, and repoint the stack in lime mortar rather than cement.
• Keep a handful of matching slates or tiles in the shed. Twenty years from now you will be glad of them.
• For stone floors, mop with a neutral cleaner, re-sand joints occasionally, and lift and relay rather than replace where you can.

Spend the money once, look after it properly, and both roof and floor will outlast you.