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HDB Renovation Rules and Permits: What You Can Hack, When and Who Can Do It
Which HDB renovation works need a permit, who can apply for it, the permitted noise hours, the material and contractor rules, and which walls you can and cannot hack.
- Every wall hacking job in an HDB flat needs a permit, and your DRC contractor applies for it.
- Structural walls and household shelter walls cannot be hacked or drilled.
- Noisy work like hacking runs only on weekdays, 9am to 5pm.
Homey Furnishing (updated 14 October 2026) 11 min read Under HDB wall hacking rules, you need an HDB renovation permit before you hack or alter any wall in your flat, and your renovation contractor applies for it on your behalf. HDB's rules go further than walls: they decide which contractor you may hire, which hours noisy work can run, what you can do to a new BTO toilet, and which jobs need a licensed specialist instead of a renovation crew.
Picture an owner who wants to remove the kitchen wall in a 4-room flat. Before anyone talks about finishes, three questions decide the job: is the wall structural, will HDB approve it, and who is allowed to apply for the permit. This guide answers those, then covers noise hours, material rules and what a general handyman can still do without a permit.
Which renovation works need an HDB permit
HDB requires a permit for works that could affect the building's structure or public safety. In a 5 February 2024 written answer, MND gave demolition of walls and replacement of windows as examples, and said overlaying floor tiles, electrical wiring and carpentry do not need an HDB permit.
HDB's own guide at MyNiceHome adds detail. You need a permit for:
- hacking or altering any wall, whether partial or complete;
- removing existing floor finishes (overlaying on top is a different job);
- replacing the main entrance door if it sits along a fire escape route;
- changing finishes or extending a bathroom or toilet after the 3-year restriction period;
- window installation or replacement, through a BCA approved window contractor.
| Work | HDB permit? | Who does it |
|---|---|---|
| Hacking a non-structural wall | Yes, written approval first | DRC-listed contractor |
| Removing floor or toilet finishes | Yes | DRC-listed contractor |
| Overlaying floor tiles, carpentry | No | DRC-listed contractor |
| New or replacement windows | Yes | BCA approved window contractor |
| Electrical installation | Not for most work | EMA licensed electrical worker |
| Water and sanitary pipe work | No | PUB licensed plumber |
| Patching, hinges, small repairs | No | Your own repair contractor or handyman |
Who applies, and what happens after approval
You authorise your renovation contractor to submit the application online, and the contractor sends in the flat's floor plan with the proposed works so HDB can evaluate items such as wall demolition (HDB). HDB does not publish a fixed processing time on its renovation pages, so build a buffer into your key collection or move-in plan.
Once works are approved, the contractor must put up a Notice of Renovation Works outside your door showing their contact details, the renovation period and the hacking dates (MND, 6 July 2021). Neighbours within two flats of yours must be told at least five days ahead (MND, 5 February 2024). HDB also sets a time frame: renovation should be completed within 3 months for new flats and 1 month for existing flats (MyNiceHome).
What happens if you skip the permit
HDB states that you may face prosecution for hiring a contractor outside its Directory of Renovation Contractors (DRC), or for unauthorised demolition or hacking under the Housing and Development (Renovation Control) Rules (HDB). Errant contractors can face financial penalties, demerit points and debarment (MND, 6 July 2021). HDB does not publish a fixed fine for owners on these pages, so treat any figure a salesperson quotes with caution. The practical cost is often worse anyway: reinstating a wall at your own expense.
HDB wall hacking rules: walls you cannot hack
Some walls are structural or safety-critical, and no permit will approve removing them:
- reinforced concrete (RC) structural walls, which hold the block up;
- household shelter walls, floor and ceiling, which HDB says must not be hacked or drilled;
- walls carrying services that cannot be safely relocated.
An RC wall is usually thicker and does not sound hollow when knocked, but do not guess. The permit process and a proper site check confirm it. If someone offers to "just hack it lah" without checking, walk away.
Walls you usually can hack
Non-structural partition walls are commonly approved, such as the wall between a kitchen and living room (the classic open-concept hack), bedroom partitions, and some kitchen walls subject to the structural check. That is how a 4-room flat gets a brighter, more social layout.
HDB also limits how hacking is done. Hacking can only be carried out on weekdays, with up to two approved handheld power tools in use at any time, and must be completed within three days (MND, 6 July 2021).
Can you hack a bedroom wall in an HDB flat?
Often yes, if the wall between the bedrooms is a non-structural partition and HDB approves it. Merging a common bedroom into the master bedroom, or opening a bedroom into a study or the living room, is a common request in BTO and resale flats. Settle three things first:
- Confirm the wall type. Some bedroom walls are reinforced concrete and cannot be removed.
- Think about resale. Some buyers search by bedroom count, so a merged room narrows who your flat appeals to. A glass partition, sliding door or half wall keeps the open feel and the option of a separate room.
- Plan the making good. The floor strip where the wall stood needs screed and new finishes, and any switches or power points on that wall have to be moved by a licensed electrical worker.
HDB renovation noise rules and working hours
Noisy works (demolishing walls, removing wall or floor finishes, cutting tiles and heavy drilling or hammering) are allowed Monday to Friday, 9am to 5pm only. General works such as plastering, screeding and painting are allowed Monday to Saturday, 9am to 6pm. No renovation work runs on Sundays or public holidays (MyNiceHome). MND confirmed the 9am to 5pm weekday limit for noisy work in a 7 May 2024 written answer, which also requires contractors to dispose of debris at NEA-approved sites at the end of every workday.
Noisy works are also barred on the eve of major public holidays. HDB's renovation timing table lists these as New Year's Day, Chinese New Year, Deepavali, Hari Raya Puasa and Christmas Day.
Photo: MapStaringEnthusiast, CC0, via Wikimedia Commons.
In practice, a hacking slot near Chinese New Year or Deepavali disappears fast. Book the hacking dates first, then schedule carpentry and painting around them.
Is there an HDB approved material list?
HDB does not publish one master list of approved materials for flats. Its rules attach to the type of work, through its general and technical terms and conditions (HDB). These are the ones owners trip over most.
The 3-year toilet rule: newly built flats have a 3-year restriction on removing wall and floor finishes in bathrooms and toilets, which protects the waterproofing. HDB's guidelines count it from the block's completion date, not from when you got your keys. You can overlay new tiles on the original ones in the meantime (MyNiceHome).
Windows must be installed or replaced by a BCA approved window contractor listed with HDB. Some precincts add facade rules, such as keeping replacement windows similar in type and colour to the originals.
Inside the household shelter, certain finishes and fixtures are not permitted because they cannot be removed easily in an emergency, and the shelter door must still open and close properly (HDB).
Specialist trades have their own licences. Air-conditioners need a BCA-trained installer, electrical installation needs an EMA licensed electrical worker, and water service and sanitary works need a PUB licensed plumber (HDB).
Who can do the work: DRC contractor or handyman
HDB's rule is wide. You should engage only contractors from the Directory of Renovation Contractors to carry out renovation, including works that do not need HDB's approval. Check any contractor on HDB's e-Service before you pay a deposit, and ask whose DRC listing the permit will be filed under.
Repairs are treated differently. HDB's minor repairs page says owners maintain their own fixtures and fittings and may engage their own repair contractor, and HDB notes you can use a handyman without a PUB licence for simple plumbing works. A general handyman fits jobs like:
- patching holes and hairline cracks;
- adjusting or replacing hinges, door closers and window handles;
- clearing a choked floor trap or basin;
- assembling furniture and putting up curtains or blinds.
Anything that hacks, removes finishes, changes the layout or touches windows, wiring or water pipes belongs with the right DRC contractor or licensed specialist. Homey works as a general handyman and does not offer licensed electrical, plumbing or window work.
"Making good" and what you are buying
When a wall comes down, the floor, ceiling and adjacent walls are left with exposed edges, tile gaps and uneven surfaces. "Making good" is the patching, plastering and finishing that makes the opened space look intentional, and it belongs in the quote from the start.
In a resale flat, hacking often uncovers old wiring, water damage or uneven original work, which is why resale hacking can run higher. Keep a 10 to 20% buffer. Hacking is often around 10 to 20% of a renovation quote, so judge crews on protection and cleanliness, not price alone. Ask how they protect floors and door frames, contain dust, bag and remove debris, and keep you updated.
Before you book anyone, photograph each wall you want to remove from both sides, the floor where it meets the tiles, and any switches or sockets on it, plus your floor plan if you have it. Send those through the form on our hacking and demolition page and we will tell you what needs checking and approval before work is arranged.
Related HDB renovation guides
- HDB renovation permit: which works need one and how to apply
- HDB registered contractors (DRC): how to check before you hire
- HDB toilet renovation: cost, the 3-year rule and overlay vs hacking
- HDB kitchen renovation cost and open concept kitchen rules
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FAQ
Do I need an HDB renovation permit to hack a wall? Yes. All demolition and hacking of walls, partial or complete, needs HDB's prior written approval, and your renovation contractor applies for it with your floor plan.
Which renovation works do not need an HDB permit? Overlaying floor tiles, carpentry and electrical wiring do not need an HDB permit, according to MND's February 2024 answer. They should still be done by a DRC-listed contractor, and wiring must be done by an EMA licensed electrical worker.
What are the HDB renovation noise hours? Noisy works such as hacking, tile cutting and heavy drilling are allowed Monday to Friday, 9am to 5pm. General works run Monday to Saturday, 9am to 6pm, with no renovation on Sundays or public holidays and no noisy work on the eve of major public holidays.
Is there an HDB approved material list? HDB does not publish a single approved material list for flats. The rules are set per work type, such as the 3-year restriction on toilet finishes, BCA approved window contractors for windows, and limits on finishes inside the household shelter.
Can I hack the wall between two bedrooms in my HDB flat? Usually, if the wall is a non-structural partition and HDB approves it. Consider a glass partition or sliding door if you want to keep the room separable for resale.
Can I hack or drill a household shelter wall? No. HDB says the walls, floor and ceiling of the household shelter must not be hacked or drilled, and the shelter door must stay in working order.
How much does it cost to hack a wall in Singapore? It depends on the wall length, thickness, debris removal and the making good afterwards, so contractors quote after seeing photos or the site. Ask for an itemised quote that separates hacking, disposal and plastering. Our hacking and demolition page explains how we quote.
Can I drill into an HDB wall? Yes, for shelves, curtain tracks and fixtures, except into the household shelter walls, floor or ceiling. Heavy drilling counts as noisy work, so keep it to weekdays 9am to 5pm. A handyman can do this without a renovation permit.