Who still holds a key to your new Miami home

Why the old keys still matter

A home in Miami-Dade changes hands in many different ways. It may be a resale from a long-time owner, a sale from an investor who rented it out, a bank-owned property, a unit in a condo building, or a house built decades ago that has been renovated several times. In every one of these cases the lock cylinders on the exterior doors were set up for a different set of keys than the ones you were handed at closing. The important point is that handing you a set of keys does not take away anyone else's set.

Think about everyone who might have needed access over the life of the property. The seller and their family. A listing agent who placed a lockbox or kept a spare. A showing agent. A home inspector. An appraiser. A stager. A cleaning crew that worked before the sale. A pool service. A landscaper. A neighbor who watered plants during a long stay abroad. Each of these people may have been given a key, made a copy, or left a key on a hook somewhere. None of this implies anyone intends harm. It simply means you cannot know how many working keys exist, and you cannot ask all of them to return what they hold.

Rekeying answers that problem directly. The lock stays on the door, but the pins inside the cylinder are changed to match a new key. Old keys slide in but do not turn. You get a clean starting point without having to trust a list of names you will never see.

What a rekey is and what it is not

A rekey changes the internal arrangement of the cylinder so a different key operates it. The knob, deadbolt or handle set on the door usually stays as it is. A technician removes the cylinder or lock body, takes out the existing pins, fits pins sized for the new key, and reassembles it. Afterward the old key no longer turns the lock and the new key does.

A rekey is not a replacement of the hardware. If the lock is worn, loose, corroded or does not suit your needs, then replacing it may make more sense. Many owners prefer to rekey when the hardware is sound, because the door keeps its existing look and fit, and every lock can be set to the same new key so one key opens the front, back and side doors. That is called keying alike, and it is one of the most practical things you can ask for in a new home. For a deeper look at the choice, read our guide on whether to rekey or replace.

A rekey also does nothing about other ways into the home, such as a weak door frame, a sliding door that lifts out of its track, or a garage entry door that is never locked. It addresses the key question only, and it does that job well.

Which doors and locks to include

Walk the property and count every point that takes a key. Many owners are surprised by how long the list becomes. Start with the main entry door and its deadbolt. Add the back door, any side door, and the door between the garage and the house. Then think about locks that are easy to forget.

Items to count before the technician arrives:

• Front door deadbolt and handle set, including any separate lock on the handle itself
• Back or kitchen door and any side entry
• Door from the garage into the home
• Sliding glass doors that have a keyed latch
• Gate locks, including a side gate, a pool gate or a courtyard gate
• Mailbox lock, or the cluster mailbox key if your building uses one
• Storage closet, utility room or detached shed
• Any keyed window locks on older windows
• Interior locks you want secured, such as an office or a room for valuables

Rekeying a house versus a condo or townhouse

In a single-family house you control every exterior lock, so a full rekey is straightforward. In a condo or townhouse the picture is different. The unit entry door and its deadbolt are often yours to rekey, but the building may control the lobby doors, the mail area, the garage gate and any shared amenity doors. Some associations require that unit locks remain compatible with a master key held by the building for emergencies. Others require notice before any lock work is done on a door that is part of the building's fire or entry rating.

Before booking work on a condo door, read your association documents or ask the management office whether there are rules on lock changes. If the building keeps an emergency key and you change the lock without telling anyone, that can cause trouble later during a water leak or a fire inspection. If the rules require a specific brand or keyway, tell the locksmith when you call so the right parts are brought to the visit. Our guide on condo door hardware rules explains what to ask your association.

For a townhouse in a community with shared walls or a guard-gated entrance, the same idea applies. You control your own doors, but the community may control the gates and shared areas. Treat those as separate jobs.

What a technician checks when they arrive

A good technician does not simply start taking apart locks. They begin by confirming who you are and that you have the right to change the locks, which is a reasonable step for any lock job. Expect to be asked for proof that the home is yours or that you are the tenant with permission. A closing document, a lease, a utility bill or a government photo ID matching the address are common examples. The reason is simple: the same service that protects you could be used by someone with bad intentions, so a responsible company confirms authority first.

Then the technician looks at each lock. They check whether the cylinder is a common brand and keyway that can be rekeyed on site. They test the bolt throw, which is how far the bolt extends into the frame. They check whether the strike plate lines up, whether the door sags, and whether screws are short or stripped. A lock that is worn out or damaged may not hold a rekey well, and the technician will tell you that rather than forcing a poor result.

Some locks cannot be rekeyed. Certain low-cost hardware, locks with damaged cylinders, and a few unusual designs may need replacement. When that happens, the technician explains why and describes the options before any work begins. Prices and the scope of work are always given by phone first, and larger jobs may need an on-site look before a firm quote is possible. There is a service call charge, and it is explained on the phone before anyone is dispatched.

How the visit goes, step by step

When you call, describe the property, the number of locks, and what you want done. The dispatcher explains the service call charge and how quotes work, and gives you the next step. If it is a straightforward rekey, the technician can often work through all the doors in one visit.

At the property, the sequence usually runs like this:

1. The technician confirms identity and authority to change the locks.
2. Each lock is examined and tested so any hardware problem is found before it is rekeyed.
3. The cylinders are removed one at a time, and the pins are changed to the new arrangement.
4. Every lock is reassembled and tested with the new key, and with the old key to confirm it no longer turns.
5. Spare keys are cut on request, and you test them yourself before the technician leaves.
6. The final scope and charge are confirmed against what was explained on the phone.

Keying alike and planning your key set

If you are rekeying several doors, decide how you want them keyed. Keying alike means one key operates every lock. It is convenient, and it means fewer keys on a ring. The tradeoff is that losing one key affects every door, so some owners choose a small set of groups. A common plan is one key for the main exterior doors and a separate key for the garage entry, a shed or a rental suite.

Think about who will actually carry keys. A household of two adults, a teenager, a grandparent who visits, and a cleaner may need different levels of access. Our guide on key control for families walks through ways to handle that without handing out master access to everyone.

Also decide about spares. Have enough to cover everyone who needs access plus one spare kept somewhere sensible and not outside the door. A key hidden under a flowerpot or in a fake rock is the first place anyone looks.

Smart locks, keypads and what to do about them

Some new homes already have an electronic lock fitted by the previous owner. A keypad or app-based lock stores user PINs, and the previous owner, a rental guest or a cleaner may still have working access numbers. Do not assume the lock resets itself on sale. Ask whether the lock can be reset to factory settings, change the master PIN, and remove every stored user before you rely on it.

If the electronic lock has a physical key override, the cylinder behind the faceplate can also be rekeyed. A technician can handle both the physical side and the access list. For more on choosing and setting up these locks, see our pages on smart lock installation and keypad lock setup.

If you plan to move to an electronic lock in a few months, it is still worth rekeying the existing locks now. It closes the gap today, and you are not left exposed while you decide.

Common situations in Miami-Dade

A buyer closing on a house in a Hialeah or Kendall neighborhood often receives several keys that nobody can account for, because homes in those areas frequently have long ownership histories and several rounds of contractors. A rekey on move-in day is a simple way to start clean.

An investor who bought a property that was previously a rental has an even larger reason to rekey. Tenants come and go, and a former tenant who lived there for a long time may have made copies. A rekey also helps if your new place was occupied by a tenant who left on poor terms.

A condo buyer in a high-rise may find the unit door keyed to a building system. The management office can tell you whether you may rekey it. Salt air and humidity near the coast can also leave older locks stiff or corroded, and a technician may recommend replacing a worn lock rather than rekeying it. Our page on sticking lock cylinders covers how to tell the difference between a lock that needs service and a lock that needs replacing.

What to have ready and what to do before you call

A few minutes of preparation makes the visit shorter and less confusing. Walk through the house and make a simple list of every keyed lock. Note the type of each one: deadbolt, knob, lever handle, sliding door latch or gate lock. Take a clear photo of each lock from the outside and the inside. Photos help the dispatcher and technician judge brand and condition before arriving. For tips on what to photograph, see photos that help a locksmith.

Gather your proof of authority. If you have just closed, bring the closing paperwork or the deed information. If you are a tenant, bring a copy of the lease and be ready to confirm that your landlord permits lock changes. Have a photo ID ready that matches the name on those papers.

Gather every key you were given at closing so the technician can test them and confirm which ones are for which locks. Decide in advance how many new keys you want, and whether doors should be keyed alike. Then, when you are ready, call and describe the property. The dispatcher will explain the service call charge and how a quote is given before anyone is sent out.

After the rekey: a short checklist

Once the work is done, take a few minutes to confirm everything works the way you expect. Walk to every door and lock and unlock each one with the new key. Check from the inside and the outside. Confirm the old keys no longer turn any lock. If any lock feels stiff, tell the technician before they leave, not after.

Then think about the rest of the home. A rekey fixes the key problem, but check that the strike plates are secured with long screws, that doors close fully and latch easily, and that sliding doors have a working secondary lock. Our guide on what to do after the locksmith leaves covers these items in order.

Keep a simple record. Write down which key opens which door and where the spares are kept, and store that list somewhere private. If you later sell or rent the property, that record will make the next handover much easier. When you are ready to arrange a rekey for your new home, call and talk through the doors and the options with the dispatcher.

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Written by Claude (AI) (AI) for 24 Hour Locksmith Miami.