STG building control requested that the drains were clay rather than the standard UPVC plastic drains. Made things 10x more difficult however we managed to fit the new clay drains and work it in with concrete mix.
The other difficulty with this job was that we had to obtain a build over agreement from Southern Water to allow us to build over existing mains drains. No issue but just another cost we had to incur to allow for that.
No responses yet