Somewhere in the paperwork for a night-route change, there is a sentence that says the price is based on the measurements you gave. Most people read past it. Read it now, because it decides who pays when the part arrives and does not fit the bathroom doorway the way the drawing suggested.

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Find the line that names the numbers

Look for wording like 'based on customer-provided measurements,' 'subject to field verification,' or 'dimensions to be confirmed at install.' Any of these means the company has written its price around numbers it did not take itself. If you cannot find such a line, that is worth noting too. Ask the person who wrote the quote whether they will measure on site before the order goes in, and ask for the answer in writing.

Walk your six stops with the same tape

Use the floor-plan walk you already have. Measure the bed edge to the hall opening, the hall clear width, the bathroom door clear width (the open gap, not the door panel), and the turn at the bathroom threshold. Write each number beside the stop it belongs to. If the quote lists a size, put it next to your number and see whether the two agree. A gap of an inch or two in a doorway matters when a walker or frame has to swing through it in the dark.

Ask what happens if the fit is wrong

Get answers to these in the quote or in a follow-up message:

  • Who measures on site, and whether that visit is included in the price.
  • Who pays if the part does not fit once it arrives, and whether there is a restocking charge.
  • Whether the company takes the part back, and who pays to ship it.
  • Who reinstalls the replacement, and whether that visit costs extra.
  • Whether the quoted price holds if the measured numbers come out different.

Keep your numbers on the same page

Put your measurement sheet with the quote and the rest of the folder. If the company later says the room is not what was described, your sheet shows exactly what you reported. If the installer measures and finds different numbers, ask them to write the new figures on the quote, initial the change, and send the revised price in writing. Do not accept a changed price that exists only in conversation.

When the error is on their side

If the company's drawing shows a doorway wider than the one in your house, the error belongs to them to fix. Ask for the correction in writing before the order is placed. 'We will sort it out at install' is not a plan, and it leaves you holding the cost if the part does not fit.

If the open question is whether a given device suits her balance or strength, that is a question for her physician or therapist, not for the installer or the quote. The paperwork can tell you what a part costs to swap and who handles the swap. It cannot tell you whether the part is right for her.