Opening up a cramped layout is one of the most transformative things you can do in a renovation, but it is also the area where the stakes are highest. Hacking walls in an HDB flat in Singapore is not a simple cosmetic job, it can touch the very elements that hold the building up. This guide explains the crucial difference between walls you may be able to remove and those you must never touch, and why the rules exist to keep everyone safe.
Structural versus non-structural walls
Not all walls are the same. Some are partition walls that simply divide space, while others are load-bearing and carry the weight of the building above. From inside your flat it is often impossible to tell them apart by eye, which is exactly why you cannot rely on guesswork.
Structural elements include structural walls, columns, beams, and the household shelter, sometimes called the bomb shelter. These must never be hacked, altered, or drilled into beyond what is permitted, because they are part of the building’s safety system. Removing or weakening a structural element can be dangerous, can damage the flats around and above yours, and is illegal without the proper approvals.
The household shelter deserves special mention. Its walls, ceiling, floor, and door are all part of a protective structure, and there are strict limits on what you may do to it, right down to how you may fix things to its walls. When in doubt, treat it as off-limits and check the current rules with HDB.
What approval you need before any hacking
Because structural safety is involved, hacking works fall under HDB’s renovation framework. The essential points are:
- Engage an HDB-licensed renovation contractor. Only a licensed contractor should carry out hacking works in an HDB flat.
- Obtain HDB approval or a permit before work begins for any works that require it. Do not let hacking start on the strength of a verbal go-ahead.
- Where structural changes are involved, a qualified Professional Engineer must be engaged where required, to assess and endorse the works so the building’s integrity is protected.
These steps are not red tape for its own sake. They exist because a single unsafe alteration can affect the structure shared by every household in the block. Skipping them can lead to fines, an order to reinstate the wall at your own cost, and serious safety risks.
If your project is part of a larger renovation, make sure your contract spells out exactly what hacking is included and who is responsible for approvals. Our guide to understanding your renovation contract explains what to look for.
Planning a layout change safely
If you dream of a more open home, there are usually ways to achieve the feeling of space without touching structure. A Professional Engineer and your contractor can advise on what is genuinely possible for your flat, and what alternatives exist, such as removing only non-structural partitions where permitted, or using glazing and half-height walls to open sightlines.
Layout changes are common in older flats, where compartmented designs feel dated. Our guide to renovating an older resale flat covers how to approach these homes, and our overview of common home renovation mistakes highlights why rushing structural decisions is one of the costliest errors owners make.
For a condominium rather than an HDB flat, the process differs but the caution is the same. Check with your MCST first, as the management corporation has its own rules, and structural elements there are equally protected. Never assume a wall is safe to remove simply because it is inside your own unit.
Respecting neighbours and permitted hours
Hacking is noisy and dusty, so observe permitted renovation hours, avoid noisy works on Sundays and public holidays, and inform your neighbours before it begins. Protecting shared corridors and lifts from debris, and cleaning up promptly, keeps the peace in your block during a disruptive phase.
The bottom line on structural works
When it comes to structural changes, caution is not optional, it is the whole point. Never hack or alter structural walls, columns, beams, or the household shelter without HDB approval and a Professional Engineer where required, because these works can be dangerous and are illegal without proper sign-off. Use an HDB-licensed contractor, get the permits, and let the professionals confirm what is safe.
For the current rules on hacking, permits, and household shelters, check directly with HDB, or with your MCST for a condominium. For your specific flat, engage an HDB-licensed renovation contractor and a qualified Professional Engineer. This article is general information to help you plan responsibly, not a substitute for professional structural advice on your own home.