+1
A low cost refurbishment can sometimes command about the same as a new bathroom, assuming the old one is not that bad that it needs to be ripped out - is leaking, tiles falling off the wall, etc.
What is the tiling like? If in good condition can you get away with a professional resurface and new fittings.
If someone is doing it all for you including demolition I'd say 2 - 3K would be just for the labour and dumping - if you're lucky.