HDB Hacking Permit: A Singapore Homeowner's Guide
If you plan to knock down or open up any wall in your HDB flat, you need HDB’s written approval before a single tool is switched on. The permit is applied for electronically by an HDB-registered renovation contractor on your behalf, but the responsibility stays with you as the flat owner. This guide covers who applies, what HDB looks at, the rules on hacking itself, and the mistakes we see new homeowners make. It is written for Singapore homeowners only, and every rule here is HDB’s.
TL;DR
All demolition and hacking of walls, partial or complete, requires HDB’s prior written approval. Never tell workers to start before you have it.
Your contractor submits the application, but you authorize it and remain liable for what happens on site.
Hacking is restricted to 9:00am to 5:00pm, Mondays to Fridays, and limited to approved handheld tools.
New BTO owners should report defects early and wait before touching toilet waterproofing.
Reinforced concrete, beams and columns cannot be hacked, so ask for a layout check before you fall in love with an open-plan idea.
Table of Contents
What “hacking” means in an HDB flat
In Singapore renovation language, hacking is the removal of existing building elements: walls, floor finishes, wall tiles, sometimes fixed fittings. It is noisy, dusty and, in a block of flats, shared with the neighbors on every side, which is why HDB regulates it so closely.
Not every wall is the same. Some are structural and carry load, and they cannot be removed. Others are non-structural partitions, often between a common bedroom and the living area, and these may be hacked once HDB approves your plans. The permit exists so that a professional review of your layout happens before the work, not after a crack appears in your neighbor’s ceiling.
Experts frame the permit as a safety measure rather than red tape. Applications for wall hacking include layout plans, and hacking into reinforced concrete, beams or columns is strictly prohibited, according to HDB’s MyNiceHome guide.
When you need a permit and when you do not
HDB’s rule on walls is clear: any hacking of walls, whether partial or complete, needs written approval first. Beyond walls, HDB’s renovation permit page tells owners to apply for approvals and permits before renovations begin, and the MyNiceHome guide says the flat owner is responsible for obtaining every permit the planned works need.
Works commonly flagged as permit-required in renovation guides include:
Work | Typically needs a permit? |
Hacking or removing a non-structural wall | Yes |
Hacking structural walls, beams or columns | Not allowed |
Hacking floor finishes or raising floors | Yes |
Adding or moving plumbing points | Yes |
Painting, loose furniture, simple carpentry | Usually no, but check with your contractor |
The table reflects common contractor guidance, so confirm your exact scope against HDB’s current list before signing off. A contractor telling you that nothing needs approval because “there is no hacking” is a conversation worth having carefully, since the answer depends on every item in your scope, not only walls.
Two rules apply even when no permit is needed. First, you must engage a contractor from HDB’s Directory of Renovation Contractors for all renovation in your flat. Second, you must give written notice to neighbors within a two-unit radius at least five days before you begin.
Who applies, and how the process works
You do not file the permit yourself. Per HDB’s terms and conditions, the contractor submits the renovation permit application through HDB’s system on the owner’s behalf, once authorized. In practice the steps look like this:
Define your scope. Decide which walls, floors and fittings you want changed, ideally with a designer who has checked the original floor plan.
Engage a DRC-listed contractor. Do this before anything else is filed. HDB requires it for all works in your flat.
Sign the authorization. The contractor attaches an acknowledgement form signed by you. After HDB receives the application, you get an SMS notification.
Wait for written approval. Nothing starts until it arrives. Processing times vary with the complexity of the scope and the completeness of the submission, so ask your contractor for a realistic estimate rather than assuming a fixed number of days.
Check the status. You can follow your permit through HDB’s Check Renovation Permit e-Service.
Start within the permitted window. Once approved, the clock runs: works must be completed within one month for existing flats and three months for new flats.
There is no separate government application fee that we can point you to on HDB’s pages, but contractors may charge their own administrative or submission fees. Ask for these in writing at the quotation stage, a point we return to in our guide to renovation progress payments.
The rules that govern the hacking itself
Getting the permit is only half of it. HDB also controls how, when and by whom the hacking is done.
Workers and qualifications
When walls are being hacked or demolished, the workers must hold a Certificate of Successful Completion in Demolition Works for Renovation Contractors from the BCA Academy. If the people on site change, HDB must be informed in writing at least 24 hours ahead. Ask your contractor to show you the certificates before day one.
Tools and duration
Contractors may use only two approved handheld power tools, or their functional equivalents, at any one time, and the hacking must be completed within three consecutive days. Sledgehammers and heavy-duty pneumatic tools are prohibited. Equivalent tools must meet specifications such as a gross weight not exceeding 7 kg. These limits are why a well-planned sequence matters: a messy scope will not fit inside three days.
Hours and neighbors
Noisy works, which include hacking and drilling, are allowed only from 9:00am to 5:00pm, Monday to Friday. Other renovation work may run from 9:00am to 6:00pm, Monday to Saturday. Nothing is allowed on Sundays or public holidays. Plan your schedule around those windows, and read our article on the resale renovation timeline in Singapore to see where demolition sits in the larger sequence.
The written notice
The Notice of Renovation to neighbors within two units is not a courtesy, it is a requirement, and it applies whether or not your works need a hacking permit. A short, friendly note that states your dates and a contact number tends to prevent most complaints before they begin.
What the permit does not protect you from
HDB is explicit that owners bear the ultimate responsibility for contractor compliance. It advises against telling workers to begin hacking without approval in writing, and the owner stays liable for structural damage from unapproved or non-compliant works. Unauthorized works can lead to penalties under the Housing and Development (Renovation Control) Rules, which were most recently amended in November 2025.
So the practical rule is simple. Keep a copy of the approval, keep it visible on site, and treat any “we will apply later” from a contractor as a reason to stop and ask questions.
New BTO owners: sequence matters
If you are collecting keys to a new flat, three timing points can save you real money.
Report defects first. The MyNiceHome move-in guide describes a 30-day window after key collection for defect reporting. Reporting after renovation starts makes it very hard to establish whether damage came from construction or from your works. Our designers advise clients to settle repairs through the Building Service Centre before any renovation begins, since it prevents later disputes over liability. HDB’s move-in guide covers the defects inspection in detail.
Respect the waterproofing wait. New BTO owners must wait three years before removing floor or wall finishes in toilets, to protect the waterproofing system. If your plan includes a bathroom redo, that item belongs in a later phase.
Expect a longer approved window. New flats get three months from approval to complete permitted works, against one month for existing flats. That is more breathing room, but it still rewards a plan that is locked down before the permit is filed.
Planning a layout change that will actually be approved
Most permit headaches begin with design, not paperwork. A few habits help:
Start from the original floor plan. Know which walls are load-bearing before you sketch an open-plan living room.
Choose the scope you actually need. Opening one wall between kitchen and living area is a different request from removing a bedroom partition.
Think about what replaces the wall. Sliding doors, half-height partitions and carpentry-built dividers can deliver light and flow without a hacking request at all. Our guide to space planning for small HDB flats walks through these options.
Plan services early. Moving a kitchen or bath changes plumbing and electrical work, which brings more approvals. The kitchen renovation checklist lists what to decide before you commit.
Do not assume approval. HDB can decline requests that affect structure, so build a fallback layout into your brief.
Our perspective: permits are part of the design
We are a design and carpentry studio, and we treat the HDB permit as one input to the design, not an afterthought. Our in-house designers and carpenters work together from the first meeting, which means the question “can this wall go?” is asked while the concept is still flexible and not when the carpenter is already measuring.
That integrated approach is how we aim to deliver cohesive projects at a sensible cost. Clients tell us, and our reviews and feedback reflect, that Monarch Carpentry Design Studio is known for great design at modest cost. A layout that is approved the first time, sequenced properly and built by a team that knows the constraints, avoids the rework that quietly inflates a renovation budget.
Our advice to any homeowner: decide your wishlist, then let the rules sort it into what is possible, what needs a clever carpentry alternative and what should be dropped. A good designer saves you from the expensive version of a disappointing conversation.
— Seth Wayne
Working with Monarch on your HDB renovation
We offer consultation, interior design, design and build, architectural design, addition and alteration, and reinstatement works for Singapore homes and commercial spaces. If you are weighing a wall removal, a good first step is a conversation about what your flat allows and what your budget supports. See our services and consultation details, or read how an interior designer fits into a renovation before you decide who to hire.
A pre-hacking checklist
Before demolition day, confirm each of these:
Written HDB approval received, and a copy saved.
Contractor listed in the Directory of Renovation Contractors.
Demolition workers hold the BCA Academy certificate, and any change in workers has been notified.
Written notices delivered to neighbors within two units at least five days ahead.
Hacking scheduled between 9:00am and 5:00pm on weekdays, and finished within three consecutive days.
Only approved handheld tools, no sledgehammers.
Defects already reported, if your flat is new.
Payment schedule tied to completed stages, not to the date of signing.
FAQ
Can I hack HDB walls for renovations?
Only non-structural walls, and only with HDB’s prior written approval. Structural walls, beams and columns cannot be hacked. Share your floor plan with a designer or qualified contractor early so you know which category each wall belongs to.
Who applies for the HDB hacking permit?
Your HDB-registered renovation contractor submits it electronically after you sign an authorization form. You receive an SMS once HDB gets the application and can check progress through the Check Renovation Permit e-Service. The responsibility for compliance still rests with you.
How long does approval take, and how long can I renovate?
Processing time depends on the complexity of your scope, so ask your contractor for a current estimate. Once approved, works must be completed within one month for existing flats and three months for new flats. Plan your schedule so the permit window is not wasted.
Do I need a permit if I am not hacking anything?
It depends on the full scope, so confirm against HDB’s list. Either way, you must still use a contractor from HDB’s directory and give your neighbors five days’ written notice.
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