A quote is a short document with a lot of weight. It tells you what is being done, what it costs, and what happens when something goes wrong. For a small job in the house, such as installing a grab bar, a hand rail, or a lighting change, the most important part of the quote is often the line that describes the work. Read that line first, before the total.
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Read the scope line word by word
The scope is the list of work the quote covers. Look for the difference between a general line and a specific one. "Install grab bars" is general. "Install two grab bars at the locations marked on the attached sketch, into blocking in the wall" is specific. If the scope doesn't name the number, the location, and the fastening method, you are buying a guess, and the guess will be settled in the contractor's favor when the work is finished.
Ask what is included in the price and what is billed separately. Materials, patching or paint touch-up after the work, hauling away old fixtures, and a return visit if something doesn't line up are the lines most often left out. Ask who buys the materials and whether the quote is a fixed price or an estimate that will change.
Find the change-order rule
Things come up in the middle of a job: a wall with no blocking where the grab bar should go, a rotted board, a wire that isn't where the plan assumed. A good quote says what happens next. Ask for the written rule: any work beyond the written scope needs a written change order, with the added price, before the work starts. If the answer is that the contractor will just take care of it and bill later, that is the answer to write down and weigh.
Check the permit line
Ask whether the job needs a permit and who is responsible for pulling it. Your city or county will say which work needs one. The quote should name the answer, not leave it open. Also ask whether the contractor holds the license your local rules require for that type of work, and ask for proof of liability insurance and workers' compensation coverage for the crew. A certificate of insurance can be requested from the insurer directly if the contractor is slow to provide one.
Ask about the warranty in writing
Ask what is covered for the work, how long that coverage lasts, and who to call if something fails. Get the answer on paper, attached to the quote. A verbal promise is not something you can point to later.
If the house is rented
If Dad rents, get the landlord's written permission before the quote is signed. The lease may control what can be attached to the walls, and a quote that assumes permission you don't have is a quote that can fall apart after the work starts.
Next move
Before you sign anything, ask the contractor for a written scope that lists each task, the materials, the change-order rule, and the permit answer. Put two quotes side by side and compare them line by line, not by the total. If you want help sorting the options in St. Louis, the Local Help in St. Louis page is the next stop.