In article ,
Richard Faulkner writes:

Impossible to say - Objectively, it tends to cost me around £2,500 to
fit a smallish bathroom with bath, sink, WC, and thermostatic shower,
plus white tiling. Factor in something for hassle, and you might get to
say, £5,000 or so.

Well, I did one a couple of years ago, and this is a breakdown
from memory. I may have forgotten a few things, but I doubt I
got anywhere near £2000 on the parts. Labour was all my own.
I did buy the parts over the course of a year, which meant I
could look out for special offers.

Kawaldi Bath + fittings + P&P £120
Bath taps £40
Bath panel £70
Washbasin £80
Tap + waste £40
WC £100
Thermostaic shower mixer £80
Shower screen £80
Flooring + skirting £120
Wall tiles £60
Extractor + isolator £25
Lights £40
Shaver socket £20
Mirror £50
Cupboards/worktop £130
Pipework + plumbing fittings £150
Cable, earth bonding, etc £10
Door £8
Door furniture £15
Loo roll holder, towel rack £30
Paint £20
Fan heater + FCU £30
Radiator £54

which is coming in at under £1500. (Actually, the fan heater and
radiator were reused from previous bathroom.)

Other significant items which some people would want to add to these
would be curtains/blinds, and a heated towel rail.

OP didn't say how he was spending £10,000. If this is being paid to
a chain of national bathroom fitters, then bear in mind this is more
likely to be a £3,000 bathroom (including labour) and £7,000
profit/commission, of which the latter does exactly nothing for the
value of the house.

--
Andrew Gabriel