Lowering a floor to create a mezzanine

[Nomadic78]

Hi all

Hope you are well?

We are planning on extending our current tiny flat in London. We currently have a small living kitchen room that we are planning on extending.

The ceiling height is good at 2.8 metres and we are on a slope. So a potential plan would be to lower the space so we don't lose garden space with steps.

At the same time I think it is possible to create a mezzanine with the new head height. This would be a playroom or a third bedroom.

Question is how much work is involved in lower a floor by about 1.4 metres? Picture attached shows the current layout.

Thanks

Dan

 

[Captain Nemesis]

1) Whats that opening that can be seen in the bottom left of the photo?

2) London is the "lets dig a basement" capital of the world - there must be loads of specialist companies who could come and actually look at the site and tell you whats involved?

 

[KenGMac]

Must admit, this is one thing I would not go near, the excavation of a basement in an existing property, bluntly is scares me.

Having said that there are as posted above by "Captain Nemesis" there are many Companies in the area who will have [various] degrees of expertise in this niche field.

Ken.

 

[Deluks]

Is there rear/side access to get rid of the spoil?
If not then it's coming through the front door/window.
There will be a lot and it will be disruptive. It might just be cheaper to move to a less tiny flat.

 

[cdbe]

Is there rear/side access to get rid of the spoil?
If not then it's coming through the front door/window.

Or down the trouser legs and spread round the garden. Hopefully there will be a partial void under the floor already.

 

[Tigercubrider]

I guess the first thing to establish is that being a flat, you have the right to excavate any form of basement?
There would be consequences for the other householders.

Have you lifted a floorboard or two to investigate what's under your existing back floor? You might discover that there is already a massive space under there?