Rainwater Calculator
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Free Roof Estimate

How much rainwater is your roof losing?

Measure your roof and use long-term local rainfall data to estimate the water that could be stored instead of running to drains or ground.

Rainfall source
Met Office HadUK-Grid
Local resolution
1 km climate grid
Time required
About 2 minutes
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Start with the property address

We use the address temporarily to find the roof and its nearest long-term rainfall grid point. It is only added to our customer records if you choose to unlock the detailed results with your contact details.