In short: HDB’s renovation guidelines do not list installing a digital lock as work requiring a permit. The rule that matters is SCDF’s, and it only applies if your main door is fire-rated — in which case, since 1 March 2024, the lock itself must be certified. Your household shelter door is the one door you genuinely cannot touch.
Search for whether you’re allowed to fit a digital lock to your HDB flat and you’ll get a dozen articles ranking the best models. Almost none of them answer the question.
The regulations do exist. They sit across two agencies, they changed recently, and most homeowners find out about them from a contractor rather than before they buy. Here’s the whole picture.
Does HDB require approval?
For the lock itself, no. HDB publishes a list of renovation works requiring a permit, and installing a digital lock is not on it. Replacing a non-fire-rated main door or frame is also not on it.
What is on it: replacing a main entrance door or frame on a fire escape route. That means a door facing a common staircase or lift lobby. If that’s your flat, the replacement door and frame must be half-hour fire-rated, fitted with a self-closing device, carry an accreditor’s label, and the flat must have a localised home smoke alarm installed.
Two things apply to all renovation work regardless of permits. You must engage a contractor from HDB’s Directory of Renovation Contractors, and you remain responsible for the work. Breaches can attract a fine of up to $5,000 and an order to restore the flat to its original condition.
Full details are in the HDB building works guidelines.
The rule that actually catches people: SCDF certification
This is the one nobody mentions at the point of sale.
Since 1 March 2024, a digital lockset fitted to a fire-rated door must be certified for fire resistance. Not the door — the lock.
The requirements:
- The lockset must be tested to SS 332 or EN 1634-1, either certified together with the door or certified individually
- The Certificate of Conformity must come from one of exactly three local bodies: Element Testing Services, Setsco Services, or TÜV SÜD PSB
- The lock’s fire rating must be at least as high as the door’s. A 30-minute door can take a 30, 60 or 120-minute lockset, but not a lower-rated one
- The product must have a mechanical fail-safe — in SCDF’s words, “so that you can still unlock the DDL to leave the house, even if the battery dies”
The reference is SCDF’s page on digital locksets on fire-rated doors.
Already have an uncertified lock on a fire-rated door? If it was installed before 1 March 2024, you are not required to remove it. SCDF encourages replacing it with a certified model, but it is not a retrospective offence.
Is your door fire-rated? Here’s how to tell
Most people don’t know, and it’s the question everything else hangs on.
Look for the label. Fire-rated doors carry a serial label, usually near the hinges or on the frame, stating the rating — typically 30 minutes or 60 minutes. If there’s a label, you have a fire-rated door.
Think about where your door opens. The Fire Code has required fire-rated main doors for certain HDB flats since 1996. In a 2017 parliamentary answer, the Ministry of National Development described the trigger as a unit’s entrance being within three metres of the lift lobby or staircase, while units opening into external corridors generally do not require one.
HDB’s own guidance frames it as doors facing a staircase or lift lobby. The wordings differ slightly, which is a good reason not to guess.
If you can’t find a label and you’re not sure, ask HDB about your specific unit before buying anything. It’s a phone call, and it decides whether you need a certified lockset or not.
Metal gates
Replacing your main entrance metal gate does not require a permit, but there are real constraints:
- Keep the same width, same number of panels and same swing direction as the HDB original, and the swing must not obstruct public escape routes
- Along a common corridor, you need at least 0.6m between the gate and the corridor parapet wall when the gate opens perpendicular to it
- Beside a staircase, clearance must equal the staircase width, measured from the gate edge at every opening angle
- Corner units — the gate must not strike the neighbouring flat’s window
On fitting a digital lock to a gate: SCDF’s certification requirement is written specifically for fire-rated doors. A metal gate is not a fire-rated door, so that requirement does not apply to it on its face. HDB’s gate rules govern dimensions, swing and clearance rather than lock type. Anything beyond that — weather exposure, frame thickness, whether a given model suits an outdoor gate — is a product question, not a regulatory one.
The one door you cannot touch
Your household shelter — the bomb shelter — is governed separately, by SCDF, and the rules are absolute.
SCDF’s Technical Requirements for Household Shelters list under Not Permitted Works:
Modifying, changing, removing or tampering of HS door.
Also prohibited: tampering with or covering the HS door notice, and hacking or drilling the shelter walls, floor and ceiling slabs beyond what one narrow clause permits.
What you are allowed to do: drill into the internal face of the shelter walls to a depth of no more than 50mm, and paint the walls, ceiling and door — but not over the door notice, the locking bolts or the door seal.
There is no SCDF rule naming digital locks on shelter doors specifically. There doesn’t need to be. Fitting one means drilling the door and altering its hardware, which is modification, and modification is prohibited. If a contractor offers to do it, that’s a reason to find a different contractor.
If you’re renting
HDB does not publish a rule specifically about tenants installing digital locks. What it does say is that the flat owner is responsible for renovations in the flat.
In practice: get the owner’s written consent first. The obligation sits with them, which means any problem becomes theirs — and then yours.
What to check before you buy
A short list that covers most of it:
- Is your main door fire-rated? Check for the label. This decides everything else.
- If yes, does the lockset carry a Certificate of Conformity from Element Testing Services, Setsco or TÜV SÜD PSB — and is its rating at least equal to the door’s?
- Does it have a mechanical fail-safe so you can get out if the battery dies?
- Are replacement parts available locally? This is the most common regret with locks bought from overseas marketplaces. A lock with no local parts supply is a lock you cannot repair.
- Who services it, and for how long? A digital lock is an electromechanical device on a door you use several times a day.
Points 4 and 5 don’t appear in any regulation, but they’re the ones people raise on local forums years after installation — “if it malfunctions I can imagine it’s a pain” and “I doubt any locksmith knows how to fix it” are reasonable worries, and they’re worth answering before you buy rather than after.
Seeing them in person
We carry digital locks for main doors, metal gates and glass doors, including fire-rated door models. Ask us for the certification paperwork on any lock you are considering for a fire-rated door — a supplier who cannot produce it on request is a supplier to walk away from, and that applies to us as much as anyone.
If you are still comparing, our digital lock buying guide covers the differences between models, our best digital locks in Singapore roundup narrows the field, and there is a longer Philips digital lock review if that brand is on your list.
Not sure whether your door is fire-rated? Send us a photo of your main door frame near the hinges and tell us your block type. We will tell you what you are looking at and which locks are actually eligible for it — before you spend anything.
And handle one before you decide. The keypad feel, how the handle sits, how loud the motor is at 1am — none of that comes through in a product photo. We install our own locks rather than subcontracting, so the person advising you is the person who fits it.
Ubi showroom — 33 Ubi Ave 3, Vertex #01-16, open daily 11am to 8pm.
Frequently Asked Questions
Do I need HDB approval to install a digital lock?
HDB’s renovation guidelines do not list digital lock installation as work requiring a permit. The regulation that applies is SCDF’s, and only if your main door is fire-rated — in that case the lockset itself must be certified.
How do I know if my HDB door is fire-rated?
Look for a serial label near the hinges or on the frame stating a 30-minute or 60-minute rating. Flats whose entrance opens onto or sits close to a common staircase or lift lobby are the ones that generally require fire-rated doors. If there’s no label and you’re unsure, check with HDB for your specific unit.
What changed on 1 March 2024?
From that date, digital locksets fitted to fire-rated doors must be certified to SS 332 or EN 1634-1, with a Certificate of Conformity from Element Testing Services, Setsco Services or TÜV SÜD PSB. The lockset’s rating must be at least as high as the door’s.
I installed a digital lock before that date. Do I have to remove it?
No. Uncertified locksets installed before 1 March 2024 do not have to be removed. SCDF encourages replacing them with certified models.
Can I put a digital lock on my bomb shelter door?
No. SCDF prohibits modifying, changing, removing or tampering with the household shelter door. Fitting a lock means drilling and altering it, which is modification.
Can I fit a digital lock to my metal gate?
SCDF’s certification requirement covers digital locksets on fire-rated doors and does not address metal gates. HDB’s gate rules deal with width, panel count, swing direction and clearance rather than lock type.
What happens if the battery dies?
Certified locksets must include a mechanical fail-safe so you can still unlock the door from inside. Most also give low-battery warnings and accept an external power source. Check both before buying.
