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I would be very grateful for suggestions here, We are building a porch as part of a larger refurb. Internal dimensions approx 2x3.2m Architect has pushed for single skin with 63mm thick insulation backed plasterboard Should we go for this over a cavity wall with partial full insulation? I’m...

90kg per section so I would imagine they could be winched or carried up the stairs?

Thanks for the advice all. We managed to get the chamber approved and it’s in place now set back 300mm from the proposed build

Please could I have an idea of what I should expect to pay for the supply and fit of: - 152x152x30 steel beam 9m span, or spliced in 3 with 200x120x10 end plates - 400x155x12 flange plates bolted to the steel - padstones either either end 330x140 - a single SHS support column 100x100x5 -...

Thanks I’ll run it past my building control inspector

Thanks for those that responded with advice. The water authority has approved this idea and a groundwork’s team have confirmed that it is possible to build the new chamber off set to ensure adequate clearance from the building

Thanks Woody. Is there a source of info that I can learn more on what is / isn’t acceptable? If a 450x600 chamber was orientated ‘portrait’ then this would still give good access to the drains I would have thought?

This chamber receives drainage from the kitchen and bathrooms of the house. It will either need to be moved or modified. So, any thoughts on whether it is practically possible to re-orientate the chamber cover to sit further away?

Yes, this is what I am in the process of now. As stated, they would be happy to give permission so long as we can get the chamber cover 300mm or more away from the extension.

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