HDB Main Door and Gate Rules: Fire-Rated Doors, Digital Locks and Gate Clearance

Your main door and gate are the first things guests see, so they are often on the renovation list. In an HDB flat they also do safety jobs. HDB describes the gate as a safety barrier and the main entrance door as a fire safety barrier, and that shapes what you can change.

This guide sums up what HDB and SCDF say about replacing the main door, gate, internal doors and digital locks. It is general information, so check the latest rules for your own flat with HDB before you start.

Is your main door fire-rated?

Start here, because the rules split on this question. HDB's renovation guidelines for building works treat a main entrance door along a fire escape route, meaning a door that opens into passageways such as staircases and lift lobbies, differently from a non-fire-rated main door.

SCDF's guide to digital locksets on fire-rated doors says you can check for serial labels near the hinges of the door or door frame, which state the fire rating, for example 30 minutes or 60 minutes. If you are unsure whether your door is a fire door, SCDF suggests checking with HDB.

Replacing a fire-rated main door

For a main entrance door and/or frame along a fire escape route, HDB says:

• Permit: a permit is required.

• Fire rating: the replacement door and/or frame must be half-hour fire-rated.

• Self-closing: the frame must have a self-closing device.

• Label: the fire-rated door must also have an accreditor's label.

• Alarm: installation of a localised home smoke/fire alarm system within the unit is required by SCDF.

HDB's home care guide on gates and doors adds that 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. It keeps the door closed during a fire, so the fire and smoke stay inside the unit instead of spreading to the corridor.

If your main door is not fire-rated, HDB lists replacing a non-fire-rated main entrance door and/or frame as work that does not need a permit. Painting the external side of the main door or metal grille gate also does not need a permit.

Digital locks on a fire-rated door

Digital locks are one of the most common entrance upgrades. SCDF says that from 1 March 2024, a digital lockset installed on a fire door must be certified for fire resistance. It can be certified together with the door, or individually on its own. HDB's guidelines also say homeowners should only select digital locksets certified with a Certificate of Conformity to SS 332 or EN 1634-1.

Before you buy, SCDF suggests asking the supplier to show you the Certificate of Conformity and checking:

• Brand and model: they match the lock you are buying.

• Fire rating: the lock's rating in minutes is at least as high as the fire door's.

• Fail-safe: the product details state a mechanical fail-safe, so you can still unlock the door to leave if the battery dies.

• Test standard: the product is tested to SS 332 or EN 1634-1.

For uncertified digital locks installed on fire doors before 1 March 2024, SCDF encourages homeowners to replace them with certified ones. If you are wiring other smart devices at the same time, our smart-home wiring guide covers planning points and power.

Replacing the main gate

HDB lists replacing the main entrance metal gate as work that does not need a permit, but it has to follow these conditions:

• Same design basics: the gate width, number of panels and swing must be the same as those originally provided by HDB.

• Escape route: the gate swing must not obstruct public escape.

• Corridor units: allow a minimum clearance of 0.6m from the gate to the corridor parapet wall when the gates open perpendicular to it.

• Units next to a staircase: allow a minimum clearance equal to the width of the staircase, measured from the edge of the gate at all opening angles to the staircase railing.

• Corner units: the gate should not hit the neighbouring flat's window.

If you have bought the recess area outside your flat, HDB says all renovation there, including installing or replacing a grille, gate or door, needs a permit, and conditions are given when it is evaluated.

Internal doors and door frames

Inside the flat, HDB's door and gate guidelines are more relaxed, with a few limits worth knowing:

• Internal doors: replacing existing internal doors with ornamental timber or plastic doors does not need a permit.

• Moving a doorway: repositioning an internal door entrance needs a permit, and the new entrance should not be created through RC walls.

• Prefabricated flats: replacing door frames does not need a permit, but RC walls cannot be hacked or tampered with, the old frame should be removed by torch cutting or cutter, a layer of waterproofing membrane must be applied to the affected area after removal, and the new frame should sit within the original door opening.

• Bathroom, WC and kitchen entrances: installing a sliding glass door or PVC folding door without removing the RC lintol or hanger, if any, does not need a permit.

• Study rooms: replacing study room sliding doors with swing doors does not need a permit.

For a wider list of which works need approval, see our HDB renovation permit guide.

Looking after your door and gate

HDB's home care guide lists a few simple fixes:

• Gate bolts that will not slot or retract: repair or replace the flush bolt, clear rubbish from the bolt hole, and lubricate a tight bolt.

• A door that is hard to open or close: tighten the hinge screws, especially on the top hinge, and oil the locks, hinges and other moving parts.

• A door closer that shuts too fast or not at all: adjust the speed valves, tighten the closer's screws, and replace the closer if it is leaking fluid and the door cannot shut on its own.

A simple checklist for your entrance

• Check the label: look near the hinges for a fire-rating label before choosing a new door or lock

• Keep the closer: never remove the door closer on a fire-rated entrance door

• Ask for the certificate: confirm any digital lock for a fire door has a Certificate of Conformity to SS 332 or EN 1634-1, with a matching brand, model and fire rating

• Measure the gate swing: keep the original width, panels and swing, and check the clearance to the parapet wall or staircase

• Plan the shoe cabinet with the door: make sure carpentry near the entrance does not block the door swing, as covered in our HDB entry shoe cabinet guide

• Test before you pay: open and close every door and gate, and test the lock, before your final payment, using our renovation handover checklist

If your block is due for the Home Improvement Programme, read our HIP renovation timing guide before replacing your main door or gate on your own.

Where Blackwoods Interior stands

• Blackwoods Interior Pte. Ltd. (trading as Blackwoods Interior), UEN 201909521M

• CaseTrust accredited for Renovation Businesses (the standard tier, not Gold), valid through 28 April 2028

• Listed on HDB's Directory of Renovation Contractors (DRC)

Talk to Blackwoods Interior

Planning to change your main door, gate or entrance in your HDB flat? Book a free 30-minute consultation: WhatsApp us at 8754 3212 (Mon-Sat, about 10:00-19:00 SGT) or email Hello@bwi.sg. Visit www.bwi.sg to see more.

Cover image: illustrative concept, not a completed Blackwoods project. This guide is general information based on HDB's renovation guidelines for building works, HDB's home care guide on gates and doors, and SCDF's guidance on digital locksets on fire-rated doors, checked on 29 October 2026. Rules can change, so check the latest requirements for your flat with HDB before you start.