What to check first
Retrace your steps before you call anyone. The most likely cause is a key misplaced somewhere ordinary: another bag, a different jacket, a car, or a desk at work. Retracing the last few places you had the keys finds most of these before you need to call anyone.
Then check who else holds a spare. The third cause is that the spare you were counting on is also missing, misplaced with a family member, or was never cut in the first place. Confirm who holds a spare before you assume you are fully locked out — a phone call to a family member can save you a callout fee entirely.
While you check, think honestly about where the keys were last seen. That answer decides everything that follows: whether this is a five-minute re-entry, or a job that needs the lock changed as well.
The likely causes, in order
Misplaced somewhere ordinary (most common). The most likely cause is a key misplaced somewhere ordinary: another bag, a different jacket, a car, or a desk at work. Safe check: physically retrace the last two or three places you had your bag or pockets before treating it as lost for good.
Lost outside the home, in public (second most common). The second cause is a key lost outside the home, in a public place or on transport, where you cannot retrace every step. This is the case that turns a lost-key problem into a security question, because you cannot rule out a stranger finding it. Safe check: think about whether anything on the same keyring or in the same bag identified your address.
No usable spare (third most common). The third cause is that the spare you were counting on is also missing, misplaced with a family member, or was never cut in the first place. Safe check: call whoever you believe holds a spare before assuming you need a locksmith at all.
When to call, and who
Call a locksmith once you have confirmed there is no accessible spare. Tell them clearly whether the loss was inside the home (low risk, simple re-entry) or outside it in public (higher risk, likely needs a rekey), because that changes what they should quote you for.
Stop and rekey, not just re-enter, if the lost key could be traced back to your address — for example if it was on a ring with mail, an access card, or ID. The Singapore Police Force lists housebreaking and dishonest misappropriation among its published property-crime advisory categories, which is the exact risk a traceable lost key creates. Getting back in and doing nothing else leaves that risk open.
What it costs
Ask for a firm price for both the entry and, if needed, the rekey.
Ask for the entry price and the rekey price as two separate figures, quoted before anyone travels to you. A locksmith who only quotes "from" a number for the combined job is leaving room to raise it once they are at your door and you have little choice.
Ask, too, whether the quote includes a new set of cut keys and how many, since a rekey with only one working key afterwards is not the full job most households need.
Who to call, and how to judge them
Lockout and lock-change work is not licensed work in Singapore, so there is no public register to check a locksmith against. Judge one on a firm quoted price, a real business you can verify, and a willingness to confirm the address is yours before opening anything. An ACRA registration confirms the business exists, nothing more.
A locksmith should ask where and how the keys were lost before quoting, because that answer decides whether the job is a simple re-entry or a full rekey. All fire-rated doors at the entrance of HDB flats are installed with a door closer, a self-closing safety device that must not be removed during either job.
Frequently asked questions
How is a lost key different from being locked out?
Lost my keys means you have no working key to your home at all, not a lock that has jammed on a key you are holding. That distinction matters, because a lost key can mean someone else now has a way in, which a jammed lock never does.
What should I tell the locksmith when I call?
A locksmith should ask where and how the keys were lost before quoting, because that answer decides whether the job is a simple re-entry or a full rekey.
Sources
- Singapore Police Force, Advisories (fetched 15 Sep 2026)
- HDB, "Fixing Gate and Door Issues in HDB Flats" home care guide (fetched 15 Sep 2026)
- gov.sg, Singapore Government homepage (fetched 15 Sep 2026)
Compare locksmiths providers and get a firm price for both the entry and any rekey before anyone travels to you.
