Roof size, pitch and shape
A simple roof is easier to price than a roof with hips, valleys, dormers, chimneys, awkward junctions or a steep pitch that slows labour.
Roofing cost hub
Roofing Cost Calculators UK
Compare UK roofing costs across roof replacement, roof repairs, flat roofs, tiled roofs, slate roofs and cost per m² benchmarks. Start with the calculator that matches your roof condition, then sense-check the estimate against material type, access, scaffolding and quote value.
Choose the right roofing calculator
Each roofing calculator has a distinct role. Start with replacement if the condition is unclear, use repair for isolated damage, or use cost per m² to check whether a quote looks realistic.
Best starting point
Roof Replacement Cost Calculator
Use this for full roof replacement estimates when the roof is ageing, failing, repeatedly leaking or due for major work.
Best for leaks and damageRoof Repair Cost Calculator
Use this for isolated leaks, storm damage, missing tiles, flashing issues, minor flat roof repairs and smaller roofing jobs.
Best for quote checkingRoof Cost per m² Calculator
Use this to compare roof quotes, check material pricing and understand whether a replacement estimate sits in a realistic range.
Default UK residential roofTiled Roof Replacement Cost Calculator
Use this for concrete or clay tiled roofs, which are common across UK homes and often form the baseline replacement option.
Extensions, garages and outbuildingsFlat Roof Replacement Cost Calculator
Use this for flat roofs on extensions, garages, dormers, porches, modern additions and low-pitch structures.
Premium comparisonSlate Roof Replacement Cost Calculator
Use this for natural or artificial slate roofs where appearance, lifespan, roof structure and installation skill affect the budget.
Roof repair or roof replacement?
The first roofing decision is usually not material choice. It is whether the roof needs a targeted repair or a larger replacement. A small leak may not justify a full roof replacement, but repeated failures can make repairs poor value.
| Roof situation | Likely starting point | Why it matters |
|---|---|---|
| One isolated leak | Roof Repair | A localised repair may solve the issue without replacing the whole roof. |
| Several leaks or repeated problems | Roof Replacement | Repeated repairs can become expensive if the roof covering or underlay is failing more widely. |
| Old roof near end of life | Roof Replacement | Age, brittle tiles, failing underlay and tired battens can make replacement more sensible than patching. |
| Storm damage | Roof Repair or Replacement | The right route depends on whether damage is localised or part of a wider condition issue. |
| Sagging roof or structural movement | Roof Replacement | Structural concerns need inspection and may involve more than surface covering. |
| Quote already received | Cost per m² | A per m² check helps you compare the quote against the roof area and scope. |
Start with condition, then refine by roof type
If you are unsure what work is needed, start with the Roof Replacement Cost Calculator. If the issue is clearly isolated, use the Roof Repair Cost Calculator. Once you know the likely scope, compare tiled, slate or flat roof costs and use the Roof Cost per m² Calculator to sense-check quotes.
How roofing costs differ by roof type
Two roofs with the same area can have different costs because pitch, access, material, detailing and hidden condition change the amount of labour and preparation needed.
| Roof type | Typical cost behaviour | Main cost pressure |
|---|---|---|
| Tiled roof | Common baseline for UK homes | Roof area, pitch, tile type, battens, underlay and labour |
| Slate roof | Higher-cost, premium finish | Slate material, skilled labour, roof structure and installation time |
| Flat roof | Often lower area, but material choice matters | Membrane type, insulation, drainage falls, edge details and deck condition |
| Roof repair | Low to high depending on access and damage | Scaffolding, leak tracing, tile matching, flashing and hidden water damage |
| Full replacement | Higher total cost but clearer long-term fix | Scaffolding, stripping, waste, underlay, battens, covering and roofline details |
| Cost per m² benchmark | Useful for checking quotes | Can mislead if roof complexity, pitch and access are ignored |
Typical UK roofing cost ranges
These are broad planning ranges. Use the individual calculator pages for roof size, material, access, region, scaffolding, waste removal, VAT and contingency.
| Project | Typical range | Best calculator |
|---|---|---|
| Roof repair | £150–£5,000+ | Roof Repair |
| Flat roof replacement | £1,000–£15,000+ | Flat Roof |
| Tiled roof replacement | £4,000–£18,000+ | Tiled Roof |
| Slate roof replacement | £8,000–£30,000+ | Slate Roof |
| Full roof replacement | £5,000–£25,000+ | Roof Replacement |
What usually drives roofing costs?
Roof size creates the base estimate, but the final price is usually shaped by access, scaffolding, material choice, pitch, roof complexity and the condition of what is found after the old covering is removed.
Access and scaffolding
Scaffolding, parking, waste removal, property height and restricted access can change the cost before the roof covering is priced.
Material and specification
Concrete tiles, clay tiles, slate, felt, GRP and EPDM all have different labour, material, lifespan and installation requirements.
Hidden roof condition
Rotten timber, failed underlay, poor ventilation, damaged decking or previous patch repairs can add work once the roof is opened up.
Roofline and detailing
Ridge tiles, verges, leadwork, flashing, fascias, soffits, guttering and chimney details can affect the total cost.
Region and labour market
Labour rates, availability, waste costs and local property types can move similar roofing projects into different price bands.
Tiled, slate or flat roof?
A tiled roof is often the standard comparison point for UK residential roof replacement. It can suit many homes and is usually easier to benchmark against typical roofing quotes.
A slate roof usually sits higher in the price range because material cost, installation skill and roof structure matter more. Flat roofs are different again. They are common on extensions, garages, dormers and outbuildings, where the roof area may be smaller but drainage, insulation and membrane choice can shape the budget.
Cost per m² is useful, but roofing needs context
Cost per m² helps compare roof quotes, but it can hide important details. A steep tiled roof, a simple flat roof and a slate roof with chimneys and valleys may all have different costs even if the measured area looks similar.
Use the Roof Cost per m² Calculator when you already have a roof area, quote or budget. Then compare the result against the relevant calculator for tiled roof replacement, slate roof replacement or flat roof replacement.
Why CostIntel uses ranges, not fixed roofing prices
Roofing estimates need ranges because early prices depend on visible scope and hidden condition. A roof can look straightforward from the ground, then reveal failed underlay, rotten battens, damaged decking, poor ventilation or awkward detailing once work starts.
For more detail, read our methodology, pricing data and how costs are calculated.
Roofing decision paths
Use these paths to move from the problem you have now to the most useful calculator. Roofing decisions usually start with condition, then move into scope, material and quote checking.
My roof is leaking
Start with the Roof Repair Cost Calculator. If the leak is repeated, widespread or linked to an ageing roof, compare the repair cost with the Roof Replacement Cost Calculator.
My roof is old
Start with the Roof Replacement Cost Calculator, then compare tiled roof replacement with slate roof replacement if material choice is still open.
I have a roofing quote
Use the Roof Cost per m² Calculator first. Then check whether the quote is for full replacement, repair, tiled roofing, slate roofing or flat roofing.
I’m working on an extension or garage
Start with the Flat Roof Replacement Cost Calculator if the roof is flat or low-pitched. If the design needs to match the house, compare with the Tiled Roof Replacement Cost Calculator. For wider project planning, see our extensions cost calculators.
I’m choosing between tiled and slate
Use the Tiled Roof Replacement Cost Calculator as the UK baseline. Then compare with the Slate Roof Replacement Cost Calculator for a higher-end finish and longer-life comparison.
I’m not sure where to start
Use the Roof Replacement Cost Calculator first. It gives the broadest view before you narrow the estimate by repair, material type or cost per m².
Roofing cost FAQs
Which roofing calculator should I use first?
Use the Roof Replacement Cost Calculator if you are unsure whether the roof needs major work. Use the Roof Repair Cost Calculator for isolated leaks or damage, and the Roof Cost per m² Calculator when you already have a quote to check.
Should I repair or replace my roof?
A repair may be suitable for isolated damage, a small leak or a few missing tiles. Replacement is more likely when problems are repeated, the roof is near the end of its life, or there is wider damage to underlay, battens or structure.
What affects roof replacement cost the most?
The main cost drivers are roof size, roof pitch, material choice, scaffolding, access, roof complexity, underlay, battens, timber condition, waste removal and regional labour rates.
Is a tiled roof cheaper than a slate roof?
A tiled roof is usually cheaper than a slate roof because materials and labour are generally lower. Slate can cost more due to material price, weight, installation skill and time on site.
Is cost per m² useful for roofing?
Yes, but only as a benchmark. It can help check quotes, but it does not fully show access, scaffolding, roof pitch, hidden damage, detailing or material specification.
Are CostIntel roofing estimates fixed quotes?
No. They are planning estimates based on typical UK roofing scopes and cost drivers. A roofer needs to inspect the property before giving a fixed quote.