Thanks active builders, I thought 1.8m depth for the wet area - assuming bath is 80cm wide that leaves 1m depth for the showering area, but then that only leaves 1.2m to fit basin and toilet, which I thought might be a bit tight? We don’t really want a small basin as this is the main bathroom. My other option is to have toilet and washbasin opposite each other in the 1.2m run, but then this leaves a 80cm gap between toilet and washbasin and not sure if this would look a bit cramped?

You can go to a carpet store, pick out a carpet and have it made into a rug with bound edges. Also, in some carpet stores/furniture stores you can order a rug in a specific size. Worth looking around for that.

Miriam Do you actually mean columns as in structural elements or do you mean decorative pilasters? The size of a column is dependant on the load it is carrying and if these are load bearing elements. I would consult an architect and an engineer. There are standard sizes but the choice is driven by the structural requirements. If they are pilasters. Then a starting point would be to talk to suppliers of the plaster replica's https://www.lassco.co.uk/a-pair-of-english-cast-plaster-pilasters or others. They should be able to give you some guidance on the choice and size modules. Hope this helps Best David

It depends on a lot, like the shape of the room, the access points and dimensions around the room and so on. If you imagine that the ideal depth would be a minimum of 500mm (up to 600mm) for hanging space in open units - depending on what you are hanging or shelving. And you would want around 1m for dressing and access - it should give you a good idea. Here is a plan view which may help you. fingers crossed. This is what I would be looking for ideally in terms of dimensions for that layout. I hope it helps, regarding, Gina