Read which trade owns each line
Decide the hire by reading which lines the proposal assigns to the tile installer and which lines it leaves to plumbing, electrical, glass, and paint. A shower that still needs a valve or a drain reset is a different hire from a shower whose plumbing is already finished. Tile lines do not absorb the other trades because they happen in the same room.
Sort the sheet into two piles
Make two lists from the proposal as written. One list is work the tile installer will perform: removal if it is named, backer, membrane, setting, grout, sealant joints, and edge pieces. The other list is work the sheet gives to someone else, or work the sheet never mentions. The hire you are making is the first list. The second list is still unowned until another proposal claims it.
Unmentioned work is unowned
A valve that is not on either list does not belong to the tile installer by default. Glass, a mirror, paint at the ceiling line, and a new outlet are the same. If you need those done, they need their own written owner. Hiring a tile installer and expecting the unlisted lines to travel with the tile is how a room sits unfinished between trades.
One company can still be two scopes
Sometimes one firm will write both the tile lines and the other-trade lines. That is a broader scope only when both lists appear on the same document. A tile-only sheet from a firm that also does other work is still a tile-only sheet. Read the pages in front of you, not the range of work the firm might do on a different job.
Related Costa Tile Works services: Bathroom tile installation, Shower tile installation. See all services, service areas, and all guides.