Can You Rekey Locks to One Key? Keyed-Alike Explained

Yes, in almost every case a locksmith can rekey your front door, back door, side gate and garage entry so they all open on one key. It is called keying alike, and it is a rekeying job, not a full lock replacement, so the cost is close to a standard rekey plus a small amount per extra door.

What "keyed alike" actually means

Keyed alike means every lock on the job shares the same internal pin configuration, so one key operates all of them. It is different from a master key system, which is built for a landlord or business that needs one key to open everything plus separate keys for individual tenants or staff. A household doing keyed-alike usually just wants one key for the whole property, full stop, no hierarchy of access needed.

The jobs we see fall into two versions of the same idea. Some homeowners want every external door on one key, including the garage side door and a rear gate deadlock. Others want the front and back doors matched but leave a shed or garden shed on its own separate key deliberately, because they hand that key to a gardener or tradesperson without giving them access to the house. Tell the locksmith which doors you want grouped before they start, because once the pins are cut it is a re-do, not a tweak.

How a locksmith actually rekeys locks to match

Rekeying does not touch the outside of the lock or the door hardware. The locksmith removes the lock cylinder, takes out the existing pin stack, and replaces it with a new set of pins cut to a single key code shared across every lock in the group. The lock body, handle and strike plate all stay exactly as they are, so there is no drilling into the door and no cosmetic change. It is the same process used in a standard rekey job, just applied to multiple locks with one shared key code instead of each lock keeping its own.

The whole visit for a typical 3 or 4 door house runs about 30 to 60 minutes once the locksmith is on site, because each additional barrel after the first is a fast repeat of the same pinning process, not a fresh setup.

Not every lock combination can be keyed alike

This is the part homeowners get caught on. Keyed-alike only works cleanly when the locks involved are compatible, meaning they use pin-tumbler cylinders that accept a shared keyway and a locksmith can source blanks and pins to match. A few situations complicate it:

• Mixed brands: a Lockwood front door and a cheap hardware-store deadbolt on the back door may not share a compatible keyway, so one or both locks might need swapping to a matching brand before they can be keyed alike.
• Old or worn cylinders: a lock with worn pin chambers sometimes will not hold a clean new pin set, and the locksmith will recommend replacing that one barrel rather than rekeying it.
• High-security or restricted keyways: some commercial-grade cylinders use restricted key blanks that only work within their own system, which is good for security but limits what they can be matched to.

None of this stops the job, it just means a locksmith needs to physically check what is on your doors before quoting a firm price. Anyone who quotes a keyed-alike price over the phone without seeing the locks is guessing.

What keyed-alike locks cost in Adelaide

Pricing works off the same base as a normal rekey, with a per-additional-door discount because the locksmith is already on site with tools out. Expect the first lock to cost the standard rekey rate and each matching lock after that to sit toward the lower end of the range, since there is no separate callout for each door.

Your quote may differ based on lock brand, how many doors you are matching, and whether any locks need replacing rather than rekeying to make the set work. For a full breakdown of what changes the number on any rekey job, see what it costs to rekey a house in Adelaide.

When keyed-alike is worth doing

The appeal is obvious the first time you fumble through 3 different keys in the dark at your own front door. Keyed-alike is worth it whenever the daily friction of multiple keys outweighs the modest extra cost of matching them. The situations we see it pay off most are:

• Moving into a new home: different doors were often fitted by different tradespeople over the years, leaving a mismatched set. Keying alike at move-in tidies the whole property in one visit, which pairs well with the security reasons covered in why you should change locks in a new home.
• Older residents or anyone managing a lot of keys: fewer keys on the ring means less fumbling and less risk of grabbing the wrong one under stress.
• Rental properties with several external doors: handing a tenant one key instead of 4 reduces the chance a spare goes missing and simplifies re-keying between tenancies.
• After buying a property with unknown key history: if you are already paying for a rekey for security reasons, matching the locks at the same time costs very little extra.

It is generally not worth it if your doors already share one key, or if you deliberately want a shed, garage or external building kept on a separate key for access-control reasons. In those cases, rekeying just the doors that need it is the better call, and rekey vs replace: which one actually makes sense walks through that decision in more detail.

Get your doors matched to one key

A vetted Adelaide locksmith can check your existing locks, confirm which ones can be keyed alike, and quote a firm per-door price before any work starts. If you would rather understand the full rekey-versus-replace picture first, the rekeying and lock changes service page covers both.