Internal bathroom - ventilation

[noworklifebalance]

At the pondering stages of doing a renovation on our 3 storey Victorian semi. I would like to put in a small en-suite (shower, loo , sink) for the master for occassional use, e.g. when we have guests/family staying.

The master is on the middle floor, so no access to the roof.
The site for the en-suite is at the back of the master with another room behind it and on the side of the shared wall with our neighbour i.e. entirely internal.

Any ideas how we could vent this?
Would the floors need to be lifted up and a duct run through to an external wall?

TIA

Ducting boxed in probably www.diynot.com/diy/threads/en-suite-ventilation-mid-tier-flat-no-external-wall.397816/

Could you provide a diagram? (not being facetious!)

Where are the soil pipe and drains going?

Good point re: soil pipe etc! Our main bathroom is at the opposite corner of the house.
Will see if I can attach a diagram.

I can see that one or more of our parents may end up living with us for period of time in the next 5-10 years so we are trying to make changes to allow for that.

The soil pipe is probably the bigger challenge. You need a BIG pipe, which has to run with a slight downward slope the whole way out and connect to a drain underground. If this is impossible, you're into small bore pumping system (Saniflo) territory, which isn't really where you want to be!

The ventilation duct is easy by comparison: it can slope up and down, can include bends (though ideally these should be kept to a minimum) and as soon as you get it out through a wall - or roof - the job's done.

Crikey, @CasperGutman ! Shows how little I know.

Not remotely to scale and badly drawn diagram.
The master & spare room have chimney breasts with alcoves on either side

• the idea was to put a small en-suite using the adjacent alcoves. Can be for either the master or spare/guest room. The toilet is against the far wall of the bathroom.

Hope that makes sense

Bright pink is the en-suite, which won’t eat into the rooms as much as my diagram suggests!

I doubt you'd want the soil pipe to come out through the front of the house, and it can't go out the side if the staircase is in the way, as there's no floor for it to be positioned under. That leaves taking it out through the back of the house.

Do you know which way the floor joists run in the spare room? Most likely they run across the with of the house with one end supported from the party wall, in which case you won't be able to run a soil pipe out that way, as it would clash with every joist on the way through. There's a slim possibility the pipe could drop down vertically and be boxed in a corner of the reception room below, then run under the ground floor (if the house is Victorian, it may well have a suspended ground floor with space underneath).

All that said, although I'm no expert, from the plan it looks like you're probably in Saniflo territory. It's not impossible, but read up on the possible issues before going down that route!

Thank you @CasperGutman - that’s so helpful. Yes, it’s a Victorian house and no idea about the joists.
Lots to think about!

@noworklifebalance

Thank you *@CasperGutman* - that’s so helpful. Yes, it’s a Victorian house and no idea about the joists. Lots to think about!

If you can see which way the floorboards run, the joists underneath will be at right angles to them.

Our bathroom has a vent connected to the old chimney (as are all the other rooms now). The chimney has an extractor on the top.