Repair Cost Calculator

What's your flat-roof leak going to cost you?

Pick your situation. We'll estimate the cost to fix it today, and what it likely costs if you leave it 6, 12, or 24 months. No signup to see the numbers.

Normally £29 estimate kit · FREE this week · resets in 7d

How bad is the leak?

Mild Moderate Severe

Mild = single ceiling stain, no active dripping. Moderate = multiple stains, occasional drips, blistering. Severe = active water ingress, ponding, spongy decking, structural concern.

Affected area size

Small (<15m² — extension/garage) Medium (15-40m² — typical house) Large (40m²+ — commercial)

Approximate roof area affected.

How long have you noticed it?

Few weeks Few months Year or more

Untreated leaks compound — water reaches joists, ceilings stain permanently, structural timbers rot.

Estimated cost to fix

Today

£3,000

If you wait 6 months £3,750 (+25%)

If you wait 12 months £4,500 (+50%)

If you wait 24 months £7,500 (+150%)

Estimates based on UK flat-roof prices 2024-26 (£75-£150/m² inc VAT). Untreated leaks typically increase cost 25-50% per year as water reaches joists, ceilings stain, and timbers rot. Real number depends on your roof + system — only an on-site survey gives a guaranteed quote.

Want a free on-site survey to confirm the real number?

No obligation. We'll diagnose the cause, give you a fixed-price quote on the spot. No pushy sales, no commission-driven upsell.

Got it — I'll be in touch.

I'll personally email you within the hour to confirm a free on-site survey time. In the meantime, if it's urgent, call 0800 061 4510.

Or book a slot online →

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