Roof Cost Calculator UK

How much does a new roof cost in the UK?

A new roof is priced per square metre of roof area, with the big one-off costs — scaffolding, chimney work, guttering — added on top. That's why two houses on the same street can get very different quotes: one needs a scaffold to three elevations and the other doesn't.

Rather than quote a national average that may have nothing to do with your roof, use the calculator above — it works from your own property type, covering and roof area. As a rough ordering, concrete tile sits at the affordable end, natural slate at the top, and clay and fibre cement fall in between.

Four things move the number more than anything else:

• Roof area — measured on the slope, not the floor plan. A pitched roof is meaningfully larger than the footprint beneath it.
• Covering material — natural slate sits at the top end, concrete tile at the bottom, with clay and fibre cement in between.
• Access — scaffolding is one of the largest single line items on most jobs, and terraced properties with rear access issues cost more to scaffold than a detached house with an open drive.
• What's underneath — if battens, felt or rafters have gone, that work has to happen before the new covering goes on.

Roof replacement cost by property type

These are indicative whole-roof replacement figures, assuming the old covering is stripped and disposed of and scaffolding is required. Your own roof may sit outside these ranges.

Based on a concrete tile covering with strip-and-dispose and scaffolding included. Change the covering in the calculator above to see how the figure moves.

What affects the cost of a new roof?

Pitch. A steeper roof is slower and more dangerous to work on, and it has more surface area than a shallow one covering the same building.

Access and scaffolding. This is the item homeowners most often forget. A roof you can't safely reach costs more regardless of what's going on it. Narrow rear alleys, conservatories, neighbouring boundaries and street-facing elevations all add scaffold cost.

Complexity. Valleys, dormers, hips and multiple chimney stacks all add cutting, leadwork and time. A simple gable-to-gable roof is the cheapest shape to cover.

Condition of the structure. Once the covering is off, rotten battens or failed rafter ends have to be dealt with. A good roofer will flag the risk before starting rather than surprise you halfway through.

Disposal. Stripping an old roof generates a lot of waste, and skip costs are a real line item — particularly on older properties where the existing covering is heavy.

Slate vs tile: cost comparison

Natural slate costs more up front than concrete tile and takes longer to lay, but it lasts far longer — often outliving the person who paid for it. Concrete tile is the budget option and perfectly sound; clay sits in between and holds its colour better than concrete, which fades.

In Cumbria this is not an abstract choice. Lakeland green slate and Burlington slate are local materials, and on a lot of properties around Keswick, Kendal and the national park they aren't optional — planning conditions in conservation areas and the Lake District National Park frequently require a like-for-like natural slate replacement. That changes the budget significantly, and it's the main reason a Cumbrian roof quote can look higher than a national calculator suggests.

If you're replacing a natural slate roof, it's also worth asking whether the existing slates can be salvaged and re-laid. Sound reclaimed slate is valuable and reusing it can offset a meaningful chunk of the material cost.

Flat roof replacement costs

Flat roofs are priced the same way — per square metre — but the materials and lifespans differ:

• EPDM rubber — a single seamless sheet with no joints to fail. The usual choice for extensions, garages and dormers.
• GRP fibreglass — laid wet and cured in place, giving a hard seamless finish. Good on balconies and anywhere that gets walked on.
• Felt — the traditional and cheapest option. Modern torch-on felt is far better than the old pour-and-roll systems, but it still has the shortest life of the three.

Flat roofs rarely need full scaffolding, which usually makes them cheaper overall than the per-m² rate alone would suggest.

Can I get a grant for a new roof?

Usually not, and it's worth being straight about that. Government energy schemes such as ECO4 are aimed at insulation and heating measures rather than replacing a roof covering. Where roof work does get funded under those schemes, it's normally repair work that has to happen before loft insulation can be installed — not a full re-roof.

Eligibility depends on your household circumstances and the property. If your roof has failed and you're on a qualifying benefit, it's worth checking with your local authority — Cumberland and Westmorland & Furness councils both run discretionary home repair assistance, and the criteria change from year to year. Your local Citizens Advice can point you at what's currently open.

Can you pay for a new roof in instalments?

A roof replacement is a significant cost and it almost always arrives unplanned. Payment terms on a job this size are worth raising when you call — it's a normal conversation, and far better had up front than after the quote lands.

One word of caution: be wary of any roofer who pushes a finance product hard before they've even looked at the roof. Settle the scope and the price first, then work out how you're paying for it.

Getting an accurate quote

A calculator can only ever give you a range. It can't see the state of your battens, whether the chimney needs repointing, or that the rear elevation has no scaffold access. What it is good for is sanity-checking a quote you've already had, and knowing roughly what you're dealing with before you pick up the phone.

For an exact figure, we'll come out and look. The quote is free and there's no obligation. Our £90 call-out applies within 10 miles of Carlisle city centre and covers a full inspection plus a written quote — and if the roof is difficult to see from the ground, we can put a CAA-licensed drone over it rather than guess.

Not sure whether you need a replacement or a repair? Our guide to the signs your roof needs replacing is the place to start — it covers what to look for before you spend anything.