Yes, you can certainly build over a private drain. This also includes building extensions. However, as mentioned previously, you will need to acquire a Build Over Agreement if your build will be within one metre of a public lateral drain.. - Manholes are not allowed inside the building, due to the increased risk of flooding or smells. It.. Create another form that sits around your manhole or drain cover. For manholes, make sure the frame is at least 6-8 inches larger than the cover. If there is a drain, make a frame 4-6 inches wider than the drain. Compact the dirt in your work area. For a patio, it is recommended that you compress dirt by 4-8 inches.

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1. The building control dept of your local council is actually responsible for the control of building over sewers but must consult with your local water authority. you must obtain an agreement from local water authority to build over or within three metres of a public sewer you need to get the sewer diverted local water authority can do this.. However, building regulations dictate that inspection chambers cannot be paved over or covered up in this way. As a general rule, the foundation of a new construction project will need to be situated at least 500mm away from an inspection chamber or manhole cover. Otherwise, construction will not be permitted by the local water authority.