Start with the actual problem
There are two useful questions: does the door work properly, and do the right people have the keys? A rekey changes which key operates a compatible lock. It does not straighten a door, tighten a loose frame or repair a worn latch.
Walk through the doors you use, including the door between the house and garage. Note which keys work and where the trouble happens. You don't need to remove anything. A description such as 'the key turns with the door open but not when it is shut' is useful information for assessing the fit.
Moving in, moving out, or sharing access
A move is a sensible time to review spare keys. Think beyond the front entrance: a side gate, back door or separate storage space may have its own lock. Decide who needs regular access and who only needs it occasionally.
If you rent, discuss changes with the owner or property manager first. The person arranging the work needs authority to change the locks, and the agreed key arrangements should be clear. We don't treat every rental or every property manager's requirements as the same.
One key can be convenient
Several compatible locks may be set up to use one key. Different brands or keyways can limit that option, so it is worth checking the existing hardware before buying replacements. A photo of each lock and its key can help start the conversation.
A keypad is another option, but it does not fix a door that binds. Battery access, a backup way in and the way codes are managed all matter. A good choice is one that suits the door and the people who use it, rather than the one with the longest feature list.
Keep the work proportionate
There may be no reason to replace a sound handle simply because a key is missing. Equally, a new key won't solve a failing cylinder. Our rekeying page explains the key-control side, while lock repair covers symptoms that point to a mechanical problem.
Before the visit ends, try the agreed keys and check that the door closes and locks comfortably. Ask which parts were changed and whether any further door work is needed. Keep the new spare separately from your everyday keys. The small practical details matter more than a long list of upgrades.