Bomb Shelter Doors and Storerooms: What You May and May Not Do
The steel door of an HDB household shelter may not be modified, changed, removed or tampered with — HDB lists those acts under types of work not permitted in its building works guidelines (https://www.hdb.gov.sg/managing-my-home/renovation-and-maintenance/renovation/renovation-guidelines/building-works). Painting the shelter is allowed, drilling to a depth of not more than 50mm into the internal faces for non-metallic inserts and removable screws is allowed, and the ventilation openings may be covered by removable finishes only if at least 25% of the total area of the two openings stays uncovered during peacetime. Anything permanent is out: wall tiles or plastering on the internal faces, hacking either face to form key for tiling, cornices, power driven nails inside, and covering up the door notice. Flats completed before 1996 generally have an ordinary store room instead, which falls under HDB's wall rules — altering or demolishing those walls needs a permit, and demolition of non-load bearing concrete elements needs a Professional Engineer.
Household shelter or storeroom?
HDB's Home Care Guide sets the cut-off plainly: since 1996 every flat has been equipped with a household shelter, described by HDB as having strengthened walls, floor, ceiling and a specially designed door, which must not be hacked or drilled (HDB Home Care Guide, Household Shelter). Lighting, a power point, a telephone point and TV or radio outlet points are provided inside, HDB adds, so that occupants can communicate with those outside. Flats in Singapore completed earlier generally have an ordinary store room formed by non-structural walls, and the two are governed by completely different rules on site.
Bomb shelter, HS, or store — the enclosure is a structural element rather than a cupboard:
Like other structural components of the flat, the following features of the HS must not be tampered with during renovation:
- Reinforced walls
- Reinforced floor slab
- Ceiling
- Steel door
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— HDB, Renovation Guidelines for Building Works
What you may do to a household shelter
Painting heads HDB's list of permitted works, published as guidelines set out by the Singapore Civil Defence Force. Painting of walls, ceiling or door needs no permit, with conditions: painting and covering up over the HS door notice, locking bolts or door seal are not allowed; the old paint coat is to be removed before repainting, to avoid increased paint thickness resulting in difficulty in closing and opening; and the new paint coat must be dried up completely before closing, because wet or damp paint will cause the rubber gasket to stick onto the frame (HDB Renovation Guidelines for Building Works).
Fixing things inside the shelter is allowed within a tight envelope:
Drilling into internal face of the HS walls and ceiling slab to a depth of not more than 50mm to affix non-metallic inserts and removable screws is allowed
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— HDB, Renovation Guidelines for Building Works, guidelines set by SCDF
Two conditions travel with that permission. HDB states there is no restriction to the diameter of the non-metallic insert as long as it does not exceed 50mm in length, and that flat owners are responsible for ensuring the strength of the insert is adequately provided for the intended purpose. HDB also states that fixtures such as pictures, posters, cabinets or shelves on the internal face will have to be removed by flat owners within 48 hours upon notification, the practical test for shelter joinery.
Floors and skirtings carry their own rules. Laying floor finishes inside needs no permit but must be bonded to wet cement mortar using pre-packed material, with total thickness of floor finishes and screed not exceeding 50mm; laying using adhesive is not allowed, and neither is a second layer (HDB Renovation Guidelines for Building Works). Vinyl or linoleum flooring is listed separately with conditions marked as not applicable, the simplest compliant way to match the shelter floor to the rest of the flat. Floor skirting tiles are allowed up to a maximum of 100mm high, bonded with wet cement mortar to the HS walls.
What is never allowed
Modifying, changing, removing or tampering of the HS door heads HDB's list of works not permitted. Also prohibited are wall tiles, spray of rock stone finish, cement sand finish and gypsum plastering on the internal faces of the HS walls; floor tiles laid using adhesive materials; a second layer of floor or skirting tiles; installation of cornices within the HS; fixings using power driven nails into the internal HS walls; tampering with, removing or covering up of the HS door notice; indiscriminate hacking and drilling of the walls, floor slabs and ceiling slabs other than the drilling permitted above; hacking to both internal and external faces to form key for tiling; and modifying, altering or tampering with any part of the ventilation openings, plates and mounting devices such as bolts and nuts (HDB Renovation Guidelines for Building Works).
The door: why swapping it is not an option
Replacing the steel leaf with a better-looking one, painting over its notice, or taking it off and putting it back after renovation are all outside what HDB permits. Making the existing hardware work properly is the available option, and HDB's Home Care Guide explains the most common defect:
When the door is repeatedly swung open, it knocks against the skirting tiles. This induces stress to the door hinges and may cause the screws to loosen or the hinges to break. This causes the door to sag
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— HDB Home Care Guide, Household Shelter
Three habits follow from that mechanism. Keep skirting inside the swing low enough for the leaf to clear it, remembering that HDB's limit for floor skirting tiles inside the shelter is a maximum of 100mm high. Hold the handle when opening, which is HDB's own maintenance tip, rather than letting the leaf swing into the skirting. Keep water out of the lockset when wiping down, since HDB attributes a jammed latch partly to rust from moisture entering during regular cleaning.
Damaged hardware is not a hardware-shop purchase. HDB advises engaging a contractor for household shelter door repair to replace broken hinges, and states that household shelter accessories are only available from contractors for household door repairs (HDB Home Care Guide, Household Shelter). Budget the work as TO FILL: household shelter door hinge or lockset repair.
Concealing the entrance behind full-height carpentry comes up constantly. HDB allows power driven nails only on the external face of the HS walls, to facilitate flexibility in mounting of features and fixtures by flat owners, but nothing permits fixing to the leaf, obscuring the notice, or obstructing the swing. A free-standing or side-hinged panel that touches neither is the defensible version.
Hiding the shelter without breaking the rules
Feature panelling on the outside face is expressly contemplated. HDB allows applying splatter dash or equivalent to the external face of HS walls only, to provide a rough surface for feature wall panels or wall tiles installation, while hacking that face for mounting panels or tiles sits on the prohibited list (HDB Renovation Guidelines for Building Works). Key the surface with a bonding coat, never chip it.
Ventilation is the constraint most designs miss. HDB allows closing or covering up of ventilation openings by removable aesthetic or architectural finishes provided that at least 25 per cent of the total area of the two openings is left uncovered for ventilation purposes during peacetime, and requires a minimum clearance of 50mm from the fragmentation plate to any RC beam, structure or service, rising to a clear distance of at least 500mm where such a beam, structure or service fronts the plate.
Boxing in the ceiling outside the shelter carries a requirement that drawings routinely omit:
Where false ceilings are provided outside the HS and below the ventilation sleeves, there shall be perforated access panels of minimum size of 600mm x 600mm positioned directly below each ventilation sleeve
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— HDB, Renovation Guidelines for Building Works
Fragmentation plates themselves may be removed, provided the plates and their bolts and nuts are mounted or kept together for use when needed — a labelled box handed over at completion, not a skip.
Using the shelter as a store or study
Using the space is expected, and the constraint is reversibility. HDB states that fixtures which cannot be removed easily in an emergency should not be placed or installed in the HS, as these may hamper efforts in preparing it for occupation in the event of a wartime emergency (HDB Renovation Guidelines for Building Works). Free-standing shelving, or shelving on removable screws in non-metallic inserts no deeper than 50mm, satisfies both that rule and the 48-hour removal condition. A fit-out priced as TO FILL: shelving and ventilation fit-out inside a household shelter is straightforward, whereas fixed carpentry is a problem waiting for an inspection.
Air movement is limited to the two ventilation sleeves, so paper, leather goods and camera equipment sit in Singapore's humidity with little help, and heat accumulates for the same reason. A desiccant or a small dehumidifier on the power point HDB provides is the usual fix.
Storerooms that are not shelters
An ordinary store room in an older flat is governed by HDB's wall rules, and those are stricter than most owners expect. Demolition, partial or complete, or alteration of internal non-structure lightweight partition walls such as hollow block, brick, Drywall or Ferrolite walls requires an HDB permit, can only be carried out after obtaining HDB's approval, and is allowable up to the underside of the RC beam or slab only (HDB Renovation Guidelines for Building Works). Demolition of non-load bearing reinforced concrete elements such as stiffeners, lintols or hangers also requires a permit and must be supervised by a Professional Engineer for civil or structural works, who is required to ensure proper repair of the affected elements.
One line in that table deserves memorising: in the event that steel bars are discovered during the course of the demolition, the works have to be stopped and HDB has to be informed immediately. A crew that keeps swinging converts a permitted job into an unauthorised one. Budget the paperwork and supervision as TO FILL: renovation permit application and PE supervision for storeroom wall demolition.
Enforcement is not theoretical. HDB states that a flat owner who did not engage a contractor from the Directory of Renovation Contractors, or who breached HDB's renovation rules and guidelines, faces on conviction a fine of up to $5,000 and other penalties (HDB, Important Information on Renovations), and HDB's demerit point system delists a contractor that accumulates 24 or more demerit points within 24 months (HDB, Directory of Renovation Contractors). CASE recorded 787 complaints against renovation contractors in 2025, down 18.2 per cent from 962 in 2024 (CASE media release, February 2026), and roughly 97 per cent of 2024's 962 renovation complaints were against contractors that were not CaseTrust-accredited (CASE media release, February 2025).
Noble Interior Design Pte. Ltd. is listed in HDB's Directory of Renovation Contractors (DRC Ref: HB-12-5230A, UEN 201722629H) and is CaseTrust-accredited. HDB is nonetheless explicit that a listing is not an endorsement or guarantee of a contractor's work (HDB, Looking for Renovation Contractors).
- HDB Renovation Guidelines for Building Works (household shelter and walls tables)
- HDB Home Care Guide — Household Shelter
- HDB Important Information on Renovations
- HDB Directory of Renovation Contractors (demerit points)
- HDB — Looking for Renovation Contractors
- CASE media release, February 2026 (2025 complaint statistics)
- CASE media release, February 2025 (2024 complaint statistics)
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