What a rekey changes
Rekeying changes the key arrangement inside a compatible cylinder. The handle and other sound hardware may remain in place. It is a key-control decision, not a general repair for every door problem.
If the key sticks, the handle feels loose or the bolt only lines up when you lift the door, explain those symptoms too. A rekey alone does not correct a door that has shifted or a damaged latch. The condition of the hardware should be considered before deciding which work makes sense.
Count the locks you actually use
A front entrance is only part of many homes. Check the back door, side entrance and the keyed door into the garage. A single door may have more than one keyed cylinder, so counting doors and counting locks can give different totals.
Note which keys operate each lock and whether any are missing. There is no need to take the locks apart. Photos can help identify the types in advance, and a clear list makes an estimate easier to understand.
Can everything work with one key?
That depends on the hardware. Compatible keyways may allow several locks to share a key; different systems may not. Do not buy a matching-looking lock just because you want fewer keys on the ring. Check what can work with the hardware already fitted.
For a rental or business, separate access may be intentional. A tenant, cleaner or employee does not necessarily need the same access as an owner. Agree who should have which keys before changing the arrangement, and establish the necessary permission.
A straightforward handover
Ask which cylinders, keys and visit charges are included. If a lock turns out to be damaged or unsuitable, discuss the alternative and its cost before adding work. New hardware should solve a real need, not simply be assumed as part of every rekey.
Try the new keys in every affected lock and check the door both closing and securing. Confirm that the old keys no longer operate the cylinders that were rekeyed. The home locksmith page helps put this into a wider entrance review. If the door is already troublesome, start with repair symptoms so the key change and mechanical problem are not confused.