But check with your building department; this is a major job.It's to your benefit to have an inspector sign off on it.Plan the whole job Some inspectors don't require an inspection for fixture replacements.As long as no new drain or supply pipes are to be installed, no permit will be required.Line-voltage thermostats operate at either 120 or 240 volts and control gable vent fans, electric baseboard heaters, and similar appliances.Replacing them is different but no harder than replacing a furnace thermostat.
This section shows how to remove an old tub and install a new one, as well as how to install a tub or shower enclosure.
If you are running new lines for a shower, be sure to schedule inspections.
Replacing a tub or installing a shower is a remodeling project, involving not only plumbing but also carpentry, wall repair, and perhaps tiling.
However, your banker can't accept this sort of informal calculation.
If you want to borrow money against the future value of the house, your financial institution will probably insist on a complete certified appraisal of the house, projecting forward to the completion of the construction.