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Gardening & Landscaping

Raising new patio level 80MM above previous finish level (70mm below DPC)

Connor 16/06/2026 - 8.01 AM

Hi all, I’ve recently stripped out a concrete pad and want to install a patio. When digging out I found the foundation for my house so I’ve installed the acos in top of the foundation and my new finish level is 80MM above previous finish level and 70mm below DPC. Looking at the photos will this be acceptable? If not would installing additional drainage directly next to the house in the gaps would this fix the issue? Final option is digging out all the type one and reducing existing levels remove the acos and have the fall away from the house. (Probably would have been best option but I’m pretty invested in this setup right now). Thanks

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Brighouse

Building Regulations generally recommend a minimum of 150mm below the DPC, so 70mm below is not ideal. However, if you've installed a properly connected ACO drain directly against the property and it falls correctly to a suitable outlet, many installers would consider this a practical solution where levels are restricted by foundations. The key is ensuring surface water cannot bridge the DPC. Additional drainage next to the house may help, but if possible I'd still aim to maximise the distance below DPC and ensure the patio falls away from the property. Without seeing the photos it's difficult to give a definitive answer, but the drainage arrangement is likely to be the most important factor.

Answered15 June 2026

Keno construction limited

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Luton

The best solution would be to lower the patio level and create a fall away from the house, but if that’s not practical, keeping the ACO drain and adding a gravel strip or additional drainage next to the wall would be a reasonable compromise.

Answered16 June 2026