Digital Locks for HDB Doors and Gates: A Buyer's Guide
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Yes, digital locks work on HDB flats. Most HDB main doors are prepared for a mortise lock cutout, which is the same lock type used by the large majority of digital locks sold in Singapore. What actually decides which model fits your flat is your door's fire rating and whether you also have a metal gate in front of the door.
Check your door type first
Many HDB main doors are fire-rated timber doors, and fire-rated doors have specific requirements for anything installed into them, including digital locks. Before choosing a model, it is worth understanding what a fire rating changes about your options. See our guide on why fire-rated digital door locks matter for the full explanation.
The household shelter (sometimes called the bomb shelter) inside many HDB flats is a separate, thick steel door and is not the same as your main entrance door. Household shelter doors are subject to their own regulations and are generally not fitted with digital locks, so this guide focuses on your main door and any gate in front of it.
Main door lock vs gate lock: what HDB flats actually need
Not every flat needs the same setup. The table below covers the three situations we see most often.
| Your entrance | What you need |
|---|---|
| Main door only, no metal gate | Shop HDB digital door locks |
| Main door plus a metal gate | Compare door-and-gate lock bundles |
| Gate lock first, door lock later | Shop HDB digital gate locks |
| Fire-rated main door | Browse fire-rated digital locks |
If you want one system to control both, see our guide to dual synchronised smart locks, which explains how the door and gate locks communicate with each other.
Choosing the right lock type for an HDB door
Because most HDB main doors are cut for a mortise lock, this is the standard choice for HDB flats rather than a surface-mounted deadbolt. If you are unsure of the difference, our mortise vs rim vs deadbolt comparison breaks down pick resistance, drill resistance and cost for each type.
For the gate, HDB flats typically use either a swing gate or a metal grille gate, and the right digital gate lock depends on the gate's handle style and clearance from the door. Our best digital gate locks for HDB and condo guide compares specific models by feature and budget.
Interlock field observation
In our installations, the door-to-gate clearance and the condition of the original door hardware tend to affect which models fit more than the flat type itself (HDB, Condo or Landed). Two flats of the same type can need different lock models depending on how the original door and gate were installed.
What to do next
The most reliable way to confirm compatibility before you buy is to send us photos and a few measurements of your door and gate. Our guide on how to measure your door and gate for a digital lock explains exactly what to capture, and our team checks compatibility for free before recommending a model.
Interlock's HDB digital lock range
Interlock supplies digital locks from Lockin, Aqara, Solity, Gateman and Samsung Zigbang, alongside our own Mercury series, with free installation on every order. To shop by entrance type, browse our digital door locks, HDB digital gate locks, or door-and-gate bundles. We recommend confirming door thickness, fire-rating requirements and gate clearance before choosing a model.