HDB Renovation: removing walls within the rules

HDB Renovation almost always involves the question of knocking down a wall or two, and the good news is that plenty of internal walls can come down legally. What trips people up is assuming any wall is fair game. In an HDB flat, only non-structural partition walls may be hacked, and you still need to follow HDB's guideline and get the proper approval before anyone picks up a sledgehammer.

Which walls HDB lets you remove

Most HDB flats are built with a clear split between structural and non-structural walls. The structural ones carry load and keep the building standing, so HDB will never approve hacking them. The non-structural partition walls are the ones dividing rooms, and those are usually the ones owners want gone to open up the living and dining area.

You can typically remove or partially open up:

• Partition walls between the living room and a common bedroom when you want an open concept.
• Walls separating the kitchen from the dining area, subject to the bomb shelter and service yard rules.
• Half-walls or short stub walls added in earlier renovations, as long as they are not structural.
• Stud walls and light partitions put up by a previous owner, since these were never load-bearing.

The trick is never to guess. HDB's floor plan and the renovation guideline show which walls are protected. When in doubt, ask your BCA-licensed contractor to confirm against the layout before quoting.

Walls you can never touch

This is where owners get burned. HDB is strict about a set of walls and features because they protect the building and your neighbours. Do not plan around removing any of these:

• Structural walls and beams — these carry the load of the flats above and cannot be hacked at all.
• Parapet walls — the low walls at the balcony edge must stay, and you cannot hack the floor trap either.
• Corridor-facing walls and windows — the position of your main door and the corridor windows are restricted for safety and uniformity.
• Toilet layouts — toilets cannot be shifted, so the walls boxing them in are effectively fixed.

If a contractor casually says they can open a structural wall, walk away. That work will fail the final inspection and you will be made to reinstate it at your own cost.

How to confirm a wall is safe to hack

Before you get attached to an open-plan dream, do the checks in this order:

1. Pull out your HDB floor plan and the renovation guideline booklet that came with the flat.
2. Mark every wall you want to remove and note which ones the plan flags as non-structural.
3. Get your contractor, who must be on HDB's Directory of Renovation Contractors (DRC), to verify on site.
4. Apply for the renovation permit within 3 months of key collection or resale completion, since the permit is only valid for 3 months.
5. Let HDB carry out the end inspection before you treat the job as done.

Working with a DRC-listed contractor matters here. An unlicensed worker may not know the rules, and you are the one left answering to HDB.

What opening up a wall costs you

Removing a non-structural wall is not just the hacking fee. Based on recent market observations, light partition hacking can run a few hundred dollars per wall, but the bill grows once you add making good, repainting, and tidying the exposed edges. If you open a wall between the living room and bedroom, you will likely want a feature frame or a built-in cabinet to finish the edge, and that carpentry is where the real spend sits.

For a 4-room BTO, the all-in budget typically ranges from S$30k to S$50k, and wall removal plus the finishing around it is a slice of that. Resale flats tend to run higher, around S$50k to S$80k and up, partly because older layouts need more fixing once walls come down.

Smart ways to use the space you free up

Opening a wall is only worth it if the new space works harder. A common move is to merge the living room with a bedroom to create one big family zone, then build a full-height cabinet along the freed edge for storage. Others turn the opened wall into a half-height display ledge so the room still reads as one but keeps a sense of division.

Whatever you do, keep the bomb shelter door clear. HDB requires the shelter to stay accessible, so plan your carpentry around it rather than hiding it behind a wall you just built.

Make the open plan work for daily life

Removing walls within the rules gives you a brighter, bigger-feeling flat without breaking HDB's guidelines. The key is simple: confirm the wall is non-structural, use a licensed contractor, and get the permit and inspection done in the right order. If you want help planning an open layout that still gives you the storage a Singapore home needs, we can walk through whole-house customization that fits your flat and your budget.