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Lost Your Letterbox Key in Singapore? What to Do

By Uncle Thomas, locksmith since 1998 · Updated October 2026

A lost letterbox key feels minor until you remember what lands in your letterbox: bank statements, payslips, letters from government agencies, new cards. Mail piling up in a letterbox you can't empty is also a sign to others that something's not right.

What to do

  1. Check for a spare with family or the previous owner if you've just moved.
  2. Condo residents: check with management first. Some estates use a standard letterbox lock or have rules about replacing it.
  3. Get the lock replaced. A locksmith opens the letterbox and fits a new lock with new keys, so the lost key no longer works.

Can't I just copy the key?

Only if you still have a key to copy. If it's lost, the safer fix is a new lock anyway: whoever finds your key, possibly near your block, can't use it. We don't duplicate keys; we replace the letterbox lock and give you a new set.

What we'll ask for

Proof that you live at that unit, such as NRIC with your address, a tenancy agreement or a utility bill. Your letterbox holds personal mail, so we check before opening it, every time.

Thinking keyless?

Digital letterbox locks open with a code, so there's no key to lose. We've fitted them on condo letterboxes. See letterbox lock replacement.

What it costs

Letterbox lock replacement starts from S$60, including the new lock and keys, with our no-expiry warranty. Letterboxes rarely need a midnight call-out, so we'll come at a time that suits you. WhatsApp 9224 9224 your block and a photo of the letterbox.

Lost your house keys too? See lost your house key.

Quick Answers

I lost my HDB letterbox key. What should I do?

Have a locksmith open the letterbox and fit a new lock with new keys. We check your proof of residence first.

Can a lost letterbox key be duplicated?

Not without a key to copy. A new lock is the safer fix anyway, as the lost key stops working. We don't duplicate keys.

How much does letterbox lock replacement cost?

From S$60, including the new lock and keys, with a no-expiry warranty.

Do I need to ask condo management first?

It's a good idea. Some condos use a standard letterbox lock or have rules about replacing it.

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