Moving bathroom downstairs - is it really bad idea?

[littlecrystal]

Typical Victorian house here with one bedroom serving as a large bathroom. So currently 2 bedrooms and a bathroom upstairs.
I don't feel comfortable with the current bathroom as the floor is sloping towards the middle of the house, the bath tends to flex over the wonky floor, it may be my imagination but I worry that bath full of water + me (heavy girl) is not very stable!
More over, the sewage pipe goes through the corner of the adjoining bedroom, and even though it is boxed in, that corner is awkward, I cannot place furniture there.

I need my 3rd bedroom for my growing (and very different DC!).

Even though a loft conversion would be ideal, I absolutely cannot afford it. I am very tempted to build a small extension downstairs and move bathroom there, and reinstate the 3rd bedroom, leaving a small space between bedrooms for a cloakroom (toilet+sink).

I know it is not a common decision, but majority of houses on our road has this layout (3 bedrooms and bathroom downstairs) and there is one down the road priced 40k more than the 2 bedroom one.

What would you do?
Should I just do what works for me?

It wouldn't be a deal breaker fro me as long as there was an upstairs loo. We used to live in a Victorian terrace, we had three bedrooms and the back bedroom, which could have been a double, had been split in half to create a small (but cosy) bedroom and compact bathroom. We moved when dc2 was still small, so I don't know if the bedroom would have been big enough for a teenager. We therefore had 2 double bedrooms, one single and an upstairs bathroom, plus big kitchen downstairs as the kitchen and downstairs bathroom had been knocked together. We looked at quite a lot of houses where there was a downstairs bathroom, but preferred the smaller 3rd bedroom + upstairs bathroom arrangement.

Is this a possibility for you? Children don't need huge bedrooms when they're small.