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Hi all, I am in talks with the water authority re the position of a public sewer manhole at the rear of a proposed single story extension. As it stands, the extension is planned to be built right up to the chamber cover. The water authority have agreed that we can make adaptations to this...

Yes it is a public sewer and I’ve had a CCTV survey trace done by Welsh Water.

Thank you

Yes, the proposal is to have the build right up to the line of the chamber. however as this is where our sliding doors will be, they may not have to be right up to it. As the sewer is actually off-set from the chamber slightly (see diagram), if we got permission to change that chamber to a...

Thank you, and I hope that we can satisfy them with this proposal. There is a self certification process, but not if we intend to build within 500mm of the inspection chamber access, which we are, or if the foundations sit within 500mm of the sewer. If you have any other negotiating hints or...

Just re-read your comment and wonder if you mean the dashed lines - they are the existing walls of the house that will be coming down as part of the works

Yes the grey boxes with the green diagonal lines are the foundations and they are cantilevered, except for the one on the far left of the sketch. The main purpose of them being designed as such was to remain at far away from the sewer line as possible. The above ground extension however, in the...

Thanks, the guidelines state that buildings should be >500mm from inspection chambers and foundations >500mm from sewers. These are guidelines and not ‘rules’ as such. Any thoughts on my chances?

Hi all, Thank you for reading this. I have applied for a build over agreement with Welsh Water and have just had a sewer trace performed. We propose to build near, but not over the public sewer at the rear of the property. As you can see from the attached plan that I've drawn post sewer trace...

Thank you Fred

Excellent advice, thank you Woody

Thank you. The steel beam sizes required to avoid the column we not discussed. The engineer responded saying that it was not possible to design the structure without a column. We don't require a flush ceiling, a 20-30cm drop for the steel would be acceptable. Anything more than this and we would...

Thank you for your response woody, I have edited the post to provide the existing floor plans and proposed which both include sections. I believe the joists run from the front of the house to the back. It is a single storey ground floor rear extension with a flat roof. There is an existing...

Evening all, I am new to DIYnot but have had a read of some of the informative posts on the forums. I hope I can get some useful advice to help me navigate my current position in the best possible way. From the very start of our discussions with the architect and then subsequently the engineer...