A soakaway helps prevent flooding of your new extension and home. That’s because it is basically a large hole in the ground which collects rain water from your conservatory or orangery. It should be between five to eight metres in distance from the extension and at least 2.5 metres away from the boundary of your property. The soakaway itself is usually a plastic crate which has a felt membrane to prevent twigs etc falling in and blocking the flow of water. It’s very common for a soakaway to be used for an extension, provided that extension is not built on soil which is dense with clay. That’s because in this case a soakaway wouldn’t work and some other solution would have to be found.