What does "hacking" mean in Singapore renovation?

In local renovation parlance, hacking refers to demolishing or cutting into walls, floors, or ceilings — typically to open up space, remove a partition, create a new doorway, or reroute plumbing and wiring. It sounds simple, but the structural and legal consequences depend entirely on which wall you're touching.

The two wall types: structural vs non-structural

The most important distinction in any hacking decision is whether a wall is structural (load-bearing or part of the building's frame) or non-structural (a partition that divides space but carries no structural load).

HDB flats: the key rules

HDB has clear guidelines on what can and cannot be done to flat walls. The overarching rule is that structural elements — RC walls, columns, beams, and the household shelter — must not be hacked. These are part of the building frame and their integrity affects not just your unit but the entire block.

What generally requires a renovation permit from HDB

• Hacking of any wall (structural or non-structural)
• Creating new door or window openings in walls
• Demolishing or constructing internal partitions
• Flooring and wet-area works that involve hacking screed

Your HDB-licensed renovation contractor must apply for the renovation permit on your behalf before works start. HDB's permit system also controls the type of work, timing, and materials used. If your flat is less than three years old, additional restrictions apply for wet works — confirm this with your contractor and with HDB directly.

The household shelter (bomb shelter)

Every HDB flat built in recent decades includes a household shelter — typically the store room with unusually thick walls and a heavy blast-proof door. This structure is protected under civil defence regulations and cannot be hacked or structurally altered. You may install shelving or a false ceiling inside, but the walls and door must remain intact. If in doubt, check with the Singapore Civil Defence Force (SCDF) or your contractor.

How to tell if a wall is structural in an HDB flat

The most reliable way is to look at your HDB floor plan. HDB provides original floor plans via HDB e-services (My HDBPage) — log in with Singpass and access your flat's details there. On the plan, structural walls are typically shown as thicker solid lines and are part of the building's grid system. If the plan is unclear or you are still unsure, engage a PE to assess before any hacking.

Condo and private property: different rules, same principle

In private condominiums and apartments, there is no single HDB to regulate renovation. Instead, authority sits with two parties:

• Your MCST (Management Corporation Strata Title) — the owners' body that governs the development. Renovation approval from the MCST or its managing agent is typically required before any hacking or major works begin. This includes a renovation deposit and adherence to approved hours and methods.
• BCA (Building and Construction Authority) — if proposed works affect the building's structural system, a PE-endorsed structural plan may be required and works may need to be submitted to BCA.

Common-property walls, exterior walls, and any wall that forms part of the building structure cannot be altered without the MCST's written consent and, where structure is involved, a PE assessment and possible BCA submission. "Your" unit boundary is not the same as your structural responsibility.

Adding new partition walls

If you want to add partitions rather than remove them, the rules are somewhat more relaxed — but still not free-for-all.

HDB

New lightweight partitions (brick, lightweight block, or metal-stud drywall) are generally permitted in HDB flats under the renovation permit process, subject to restrictions on maximum wall height, materials, and placement. You must not obstruct natural ventilation, block emergency egress routes, or build in a way that prevents the household shelter from functioning. Your contractor will apply for the permit covering these works.

Condo and private

Again, MCST approval is the starting point. Many condos restrict the total floor load that new partition walls can add, and masonry partitions on upper floors may require a PE to confirm the floor slab can carry the additional load. Lightweight metal-stud/drywall partitions are usually easier to approve.

The role of a Professional Engineer (PE)

A PE licensed in Singapore under the Professional Engineers Act can assess whether a wall is structural, determine whether proposed hacking or construction is safe, and — where required — endorse plans for BCA submission. For any works that touch a wall of uncertain type, or any structural element, engaging a PE is not optional — it is the only way to be sure.

PEs can be engaged directly or through your renovation contractor. Ask your contractor whether they have a structural PE on retainer or can recommend one.

The renovation permit process for hacking works

For HDB flats, the sequence is broadly:

1. Engage an HDB-licensed renovation contractor (check the HDB Directory of Renovation Contractors).
2. The contractor prepares the scope and applies for the HDB renovation permit online before works begin.
3. For any structural hacking, the contractor or you would also need a PE assessment; HDB may require PE endorsement for certain works.
4. Notify your immediate neighbours in writing before renovation starts — this is an HDB requirement.
5. Works must be carried out during HDB-permitted renovation hours; confirm the current approved hours with HDB directly as these can be updated.

For condo, the sequence is similar but goes through the MCST/managing agent rather than HDB, and BCA may be involved for structural matters. See our full guide on HDB renovation permits and the guide on MCST condo renovation approval for step-by-step details.

Practical checklist before any hacking

• Obtain your floor plan (from My HDBPage for HDB; from the developer or MCST for condo).
• Identify every wall you intend to hack or alter on the plan.
• If any wall is structural or its status is unclear, engage a PE before proceeding.
• Confirm the household shelter location and ensure it is not touched.
• Engage an HDB-licensed contractor (HDB flats) or a contractor approved by your MCST (condo).
• Obtain the renovation permit (HDB) or MCST approval (condo) in writing before works start.
• Check permitted renovation hours for your property type.
• Notify neighbours as required.

Summary

The core principle is straightforward: structural elements (RC walls, columns, beams, household shelter) must never be hacked without proper approval and PE involvement. Non-structural partitions are generally more flexible, but still require a permit (HDB) or MCST approval (condo). When in doubt — and the stakes are structural — always get a Professional Engineer involved. Do not rely on guesswork, visual inspection alone, or an unqualified contractor's assurance.

This guide covers general principles applicable in Singapore. For rulings specific to your property and proposed works, verify with HDB, BCA, your MCST or managing agent, and a licensed Professional Engineer. Rules can change and individual circumstances vary.

This guide covers general principles only and does not constitute legal or engineering advice. Rules and requirements can change. Verify all specifics with HDB, BCA, your MCST or managing agent, and a registered Professional Engineer before commencing any works.