Surface Water Drain and Soakaway in Clay Soil? Drainage pipes, concrete, footings and foundations. Post your questions and find answers here

[escortrs2]

Hi I live in a row of 4 houses that has one drain pipe from all 4 roofs that goes in to a surface water drain in my neighbours garden , so my question Is he is building a single story extension and he has had building control round and they told him to cap off the surface water drain and put a soakaway in his garden the garden is clay based is this normal practise or has building control gone mad ?

[welsh brickie]

raise the point with building control.