Short answer: for a straightforward, budget-led re-roof with no planning constraints, concrete or clay tile can be the practical choice. For a period property, listed building or traditional Edinburgh streetscape, natural slate may be required to preserve the building's character, so check what applies before you plan around tile.
Slate vs Tile at a Glance
Exact weight and minimum pitch depend on the specific slate or tile, lap, format and manufacturer guidance. Always check the technical specification for the product you're actually using.
How to Tell Whether Your Roof Is Slate or Tile
Three quick checks, no tools needed:
- Thickness. Natural slate is thin, with a visibly split and slightly uneven surface. Clay plain tiles are thicker. Concrete interlocking tiles are chunkier again, moulded to a consistent profile.
- Sound. Tap it. Slate gives a cleaner ring. Tile answers with a flatter, duller knock.
- The edge. If you've got a broken piece, look at the edge. Slate splits into thin natural layers. Clay or concrete tile just fractures.
Colour helps too, though it's a softer clue. Natural slate often varies slightly across a roof depending on quarry and batch, while concrete tiles look more uniform. If you're still not sure, a roofer can usually confirm it in a minute from the roof or the loft.
Slate: The Case For and Against
Slate roofing has been the default choice on Edinburgh's tenements and villas for generations, and it's easy to see why.
For: Natural slate sheds water well and copes with freeze-thaw conditions. It can last 80 to 150 years depending on its quality, exposure and how it's fixed. It's non-combustible, it needs very little routine maintenance, and when an individual slate fails it can often be replaced without disturbing the rest of the roof.
Against: Slate costs considerably more upfront than concrete tile, in material and in labour. Matching replacement slates also gets trickier over time, particularly where the original quarry is no longer producing or where batches vary in colour and texture.
One thing slate doesn't automatically mean is a heavier roof. Common natural slate coverings can be lighter per square metre than many concrete or clay tile systems. If you're changing material, check the weight of the exact specification you're proposing. The assumption that slate is always the heavier option is the thing that catches people out.
Tile: The Case For and Against
Tile roofing tends to appeal for different reasons, mostly cost and choice.
For: Tile is usually cheaper upfront, particularly concrete interlocking tile, and there's far more choice of profile. Pantiles, plain tiles, Roman profiles, flat interlocking tiles: slate simply doesn't offer that range.
Against: The typical lifespan is shorter, at around 40 to 70 years for concrete and 50 to 100 years for clay. Over a building's life, that can mean paying for access, labour and replacement more than once. Concrete tile is also prone to moss growth, surface weathering and colour fading.
Clay plain tile isn't necessarily a lightweight option either. Depending on the product and fixing specification, clay and concrete tiles can both weigh more per square metre than a common natural slate covering.
Lighter alternatives: if roof weight is genuinely the deciding factor, composite slate products such as Tapco and lightweight tile systems such as Envirotile are worth looking at. Weight, lifespan and warranty terms vary by product, so compare the manufacturer's actual figures. Synthetic slate is not one thing.
Slate vs Tile Roof Cost
Tile is significantly cheaper to install than natural slate in most cases. Concrete tile is generally the most affordable option, clay sits in the middle, and natural slate costs the most upfront.
Slate's much longer lifespan changes the maths over time. If a tiled roof needs replacing sooner, you're paying for materials, labour and access all over again. Over the full life of a building, the real question is what you're paying now, how long you expect the roof to last, and whether another full re-roof is likely before the building is done with.
Small repairs are generally cheaper with tile too, particularly where replacement tiles are readily available. Slate repairs take longer if the roofer has to source a close match in size, thickness and colour.
For an accurate cost for your property, get a survey and written quote. Roof size, pitch, access and material specification all affect the final figure.
Weight, structure and planning
If you're switching from slate to tile or tile to slate, don't judge the structural question from material names alone. A common natural slate covering can sit around 35 to 40 kg/m². Concrete and clay tile systems can run into the mid-40s, 50s or higher depending on the product, headlap and profile.
The figure that matters is the dead load of the actual covering you're proposing, plus battens, underlay and the rest of the roof build-up. If you're changing material on an older roof and there's any doubt about what the structure was designed to carry, get that checked before you order anything.
Planning matters just as much in Edinburgh. Like-for-like repair and replacement is usually the straightforward route. Changing the roofing material on a listed building can require listed building consent, and changes in conservation areas may need planning approval too, depending on the property and the proposal.
Much of Edinburgh's traditional housing stock was roofed in natural slate, and keeping that slate character matters most on listed buildings and prominent conservation-area streets. If your property falls into either category, check what applies before ordering tile or an alternative slate product.
Roof pitch is worth checking early as well. Natural slate, clay tile and concrete tile all have minimum pitch requirements, and they depend on the exact product, size, headlap and exposure. Some interlocking tiles are designed for relatively shallow pitches. There is no blanket minimum that covers every slate or every tile, so use the manufacturer's technical specification for the product you're actually considering.
Slate or Tile? A Quick Decision Checklist
Choose slate if: your property is listed, in a conservation area or part of a traditional Edinburgh streetscape where matching the existing roof matters; you want a very long service life and are comfortable with the higher upfront cost; or slate is already the appropriate material for the building.
Choose tile if: you're working to a tighter budget; the property has no heritage or planning reason to stay with slate; or you want more flexibility in profile and colour.
Still not sure? That's what a survey's for. Get the roof, the structure and the planning position checked before you commit to either.
Frequently Asked Questions
Can I replace a slate roof with tile, or vice versa?
Sometimes, but don't assume you can. Changing the roofing material can require planning permission or listed building consent, particularly on listed properties and in Edinburgh's conservation areas. Check the property's status and the proposed material before ordering anything.
Are synthetic or composite slates a good alternative to natural slate?
They can be, especially where lower weight, cost or ease of installation matters. Composite slates vary quite a bit in appearance, weight, lifespan and warranty, so compare the individual products you're choosing between.
On listed buildings or sensitive conservation-area properties, you'll also need to check whether the proposed alternative material is acceptable before specifying it.
Does my roof need a structural survey before switching to slate?
Not automatically. Natural slate isn't inherently heavier than tile, and common slate formats can be lighter than many concrete or clay coverings.
What matters is whether the proposed roof build-up suits the existing structure. If you're changing materials on an older roof and the loading is uncertain, get the structure checked before you commit.
Can slate and tile be mixed on the same roof?
It'd be unusual on a single continuous domestic roof plane, and not something we'd recommend without a good reason. You do see different materials across extensions, dormers and outbuildings, particularly where different parts of the property went up at different times.
On a listed building or conservation-area property, material changes may also need approval.
Which lasts longer in Edinburgh's weather?
Natural slate has the edge for lifespan. A good-quality slate roof can last 80 to 150 years depending on the slate, the fixings and the exposure, while concrete and clay tile have shorter service lives.
Edinburgh's wet weather and regular freeze-thaw cycles make installation quality matter as much as the covering. The right material badly fixed is still a bad roof.
Get Expert Advice for Your Roof
Not sure whether tile suits your property, or whether the roof needs to stay in slate? At Altitude Roofing we hold ISO 9001 (quality management), ISO 14001 (environmental management) and ISO 45001 (occupational health and safety), and we're a Constructionline Gold member. We'll survey the roof, explain what you're actually dealing with, and give you a fixed-price written quote for the right specification.
Book a free photographic roof survey. We cover Edinburgh and the Lothians, including conservation areas.