The quote is written for the bathroom as a room. It lists demolition, the tub or shower, the toilet, the vanity, the tile, the light fixtures, and the labor to put them in. It almost never lists the walk your mother makes at 3am, from the edge of the bed to the toilet and back. Your job before you sign is to read every line as a question about that walk. Take the quote and the floor plan you already marked with the six stops, and go line by line.
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Start with the work that happens during the nights
Ask who protects the floors and clears the hall while the work is going on, and whether the crew is in the house at night at all. If the bathroom is torn out for even part of the job, she still needs a way to the toilet. Write down what the quote says about a temporary toilet or a bedside commode, where it will sit, and how the night light will work along the route while the old path is gone. If the quote says nothing about this, the gap is yours to close before the first cut.
Check the floor height at the doorway
New flooring and a new tub base can change the height of the bathroom floor compared with the bedroom and hall. A small step that was invisible for years becomes the thing she catches her foot on. Ask the installer for the finished floor height at the bathroom threshold, and ask whether the transition between the hall and the bathroom is a flat strip or a raised lip. Ask the same question about the shower or tub edge, since that is where she steps over at night. The answer belongs on paper, not in a conversation.
Find out who is paying for the wall behind the grab bars
Grab bars, a shower seat, or a rail near the toilet only hold if the wall behind them is solid where the screws go. Some quotes include added framing or backing in those walls as a line item. Others say grab bars are not included, or leave a line that reads as needed. An as-needed line is how a small job turns into a change order halfway through. Ask whether the wall backing is priced now, where it will be, and who checks it before the tile goes up.
Look for the outlet and the switch
The night light, the bathroom light, and any motion light along the route need power and a switch you can reach from the bed. Check the quote for the new outlet or switch locations and whether an electrician is named. Compare those locations to the six stops on your floor plan. If the switch is at the bathroom door and she has to cross the dark room to reach it, the switch is in the wrong place, and the quote needs to say where it will be moved.
Read the allowances and the exclusions
Many quotes say tile, a fixture, or a vanity is covered up to a set amount, which is called an allowance. The amount is not the final cost once a choice goes over it. Ask what each allowance covers, who makes the choice, and what happens when the choice costs more. Then read the exclusions near the bottom. Anything marked not included, or left to the owner, is still part of the night route if it touches a stop. Write those exclusions down in your own words so you cannot miss them later.
Find the rule for changes
Old bathrooms often hide soft subfloor or rot behind the tub. The quote should say how a found problem is handled: who approves the extra work, how it is priced, and how long a decision can wait before the crew moves on. Ask for the change order rule in writing. This matters most at the stops where she stands and turns, because a rushed fix there is the one she will use at 3am.
Confirm who pulls the permit and who answers a call
Ask whether the permit is included in the quote and who applies for it. Ask also who you call when something is wrong after the crew leaves, and how fast that call is answered. Those names and numbers go on the same page as the quote. If you are not sure what the local rules require for a bathroom change, the St. Louis help page lists places to ask, and the sources page shows where the general guidance on bathroom safety comes from.
Write down before you sign
Make a short list on one sheet, and keep it with the quote. Write the quote number and the name of the person who wrote it. Write the finished floor height at the threshold, the location of each grab-bar wall and whether its backing is priced, the switch and outlet locations, each allowance and its limit, each exclusion, the change order rule, the permit owner, and the phone number for after the work. Then mark every stop on the floor plan that the quote touches and every stop it does not. A stop that no line touches is a stop nobody is paying attention to, and that is the one to ask about first.