One of the companies we install for insists that installers do not even re-fit toilets.
In this day and age it is wise to let those with the proper insurance do their specific work.
Unless you are a certified plumber your liability insurance will not cover you.
Alberta I must disagree with you there.
I am NOT a certified plumber but my public liability insurance DOES cover me to fit bathroom suites, showers, kitchens etc. They will only see red if I do major work to central heating systems.
I'm insured with Direct Line. If you phone them up they will put you onto their general policy that covers handymen etc. It's a lot cheaper than going on line with them.
All they wanted to know is my turnover, claimes history and then they checked that the policy was suitable for me.
You may be right in that tilers may not have taken out public liability insurance to do plumbing. This will depend on the policy that each tiler has.
As for removing and refitting a bath, If the new bath is going in the same place it is a relitively simple procedure. I usually allow 2 days for refitting a suite (straight swap) but having done a number of part swaps in recent months I could probably get that figure down to a day. I allow more time in case I need to do repairs to plumbing etc or that the materials the customer has bought need to be changed.
There is plenty of advice on the net - such as DIY Doctor etc about fitting a bath.
Essentially, assuming the taps and wastes are in the same place you will probably need to change the trap under the waste, and you may find that the tap connectors are too high or too low for new taps with different threads. In any case you should fit isolation valves in the supplies to the taps. I often use good quality flexible tap connectors with integrated shut off valves if I need to incorporate a shut off valve and alter the positions of the tap connectors.
If you don't need to change the tap connectors then change the sealing washers in the existing tap connectors. My preference is to use fibre washers, not rubber. I carry selection boxes of washers for domestic plumbing, so I'm never short of these. Screwfix sell these for around £10.
Now for the assemply of the bath itself. Most people who've never fitted a bath before make the following mistakes:-
- No preparation or checking the hole for the waste for rough areas likely to cause issues with achieving a water tight seal. If there are rough edges here I usually use some medium wet and dry to achieve a smooth surface.
- No Silicon used to form a seal. Despite what the manufacturers tell you you need to use Silicon between the underside of the top of the waste and the bath, then again between the underside of the bath and the rubber washer/flange of the bottom part of the waste. Even after you've rubbed down the underside of this area of the bath, you won't get a perfect seal without it.
- Inserting taps and waste after fitting the bath. Assemble these to the bath before you fit it.
Securing bath to the wall. I sometimes go a bit further with this. I fit a 2x1.5 batten for the bath to rest on in such a way that the bath can be cradled against the wall, and working from underneath at each end, can insert a screw long enough to go though the batten and into the timber in the underside of the bath rim. Be careful to choose a screw that will not penetrate the fibreglass though. Free corners are then propped with some 2x2 or similar. These props can be crossbraced or incorporated into a frame to fix hardibacker and tiles onto.
Before I fix the bath in place I pump a thick bead of Silicon around the edges of the bath that are to come into contact with the wall. This is not the final seal but works to form a first seal. If the tiles are not in the way then you can top this up.
I know I'm in a minority here but if possible I tile before I fit the bath. To get the horizontal line I set the bath into position, level it up then mark the wall a couple of mm above the surface of the bath. I them remove the bath, batten to this line and tile.
When I fit the bath, because I Silicon on the edge of the bath, the seal is in place. After the bath is secure I then seal between the bath and tiles as normal. This achieves 2 seals.
The advantages are that I don't have to worry about getting adhesive or grout into the bath and can get right up to the job without having to get into the bath myself. Also I'm not relying on the top of the bath to get my straight line for the tiles, or having to batten a tile above, wait for the adhesive to dry then do the last run.
Dust sheets tend to end up in a crumpled heap in the bottom of the bath, and bath boards can get in the way of tiling.
Assembling the legs etc is strightforward, just make sure you use the right screws at the base of the bath, otherwise you will hole it.