What is the correct sequence of work for building a bathroom?

[Rollmops]

We are going to convert our utility room into a bathroom and use the current cloak room as a mini-utility room (located next to the utility room) to house the washer & dryer.
Have requested quotes from several companies but rather disappointed with this route. One sent a quote (which we would have accepted) after a long wait and then disappeared, one never showed up and still waiting for quotes from couple.
As we are supplying all the materials and fixtures ourselves, thinking of hiring relevant tradesmen to do their bit and get the bathroom built this way.
Could anybody please advice what is the correct sequence of the work for such a project?
The plumbing exists in both rooms but has to be moved to fit the new layout. A separating wall must be built between the new bathroom and a part of utility room and currently the walls are bare brick with all the pipes etc. visible.
I would very much appreciate any advice and/or pointing me to the right direction with this project.

Do you have another bathroom in teh house?

Yes, this would be an extra one.

Ok,then gut the whole thing so that you have a blank space,and then get an idea of what look you are after.draw a scale plan of the room and work out what you can fit in.Buy all the pieces yourself and then get a quote for teh structural work.It sounds like a small structural job so highly likely the plumber who fits the bathroom will either be able to do it or have a colleague who will.If its a stud you can conceal any pipes and wire in there if need be.Stick to your guns re position of stuff as most builders take the path of least resistance but as they on't have to leave you with a functioning bathroom every night you should get a good job \Are you moving the loo because if you move it too far from the external wall you need to run teh soil stack under the floor first If its run above the floor get it well boxed in

from my experience with bathroom fitters, they hate moving pipes, ie prefer to do like for like, which why they may have been a bit offish if ykwim.

if i were you i would:

remove existing suite, tiles if you have them, yourself washing machine etc then you will have a blank canvas in each room.

get a general builder to moving pipework to where you want it to be and carry out any structural work and electrics (most good builders work with a good electrician and will probably sub contract some of the pipework as well)

if necessary plaster rooms (although builder might do above)

get a plumber/bathroom installer to install bathroom and tile.

get a painter to paint rooms if necessary.

be warned, moving soil pipes can be a real bugger.

Thank you for the replies, much appreciated! Will start by gutting the room as suggested and go from there.

When it rains, it pours.... builders that is. All came out of the woodwork suddenly, the one who gave a quote and then dissapeared was out on a new build in the countryside with no internet and mobile access and all the others have come in with decent quotes.
Seems we don't have to do it piecemeal after all .