HDB · Renovation
Renovating an HDB flat 2026: permits, rules, and budgeting
By Winfred Quek · 10-minute read · Last reviewed May 2026
Facts verified: May 2026 · Sources linked below
Key Takeaways
- • An HDB renovation permit is required for many works, and the permit must be in hand before that work begins.
- • Hacking or tampering with a structural wall or column is not allowed, structural elements hold up the building and the rule is firm.
- • HDB sets the days and hours when noisy renovation work may be done, to limit disturbance to neighbours.
- • Renovation work must be carried out by a contractor on HDB's register of renovation contractors.
- • There is no standard renovation budget, the figure depends on flat type, condition, and scope; build a worked budget with a contingency.
Renovating an HDB flat is exciting and, for many first-time owners, the first big project after collecting the keys. It is also the stage where avoidable mistakes happen, the most serious being structural work that should never have been started, and the most common being a budget that was never properly worked out.
This article covers the three things every HDB renovator needs to get right: the permits, the rules on what is and is not allowed, and a disciplined approach to budgeting.
What HDB renovation works need a permit?
According to HDB, many renovation works in an HDB flat require a renovation permit, and the permit must be obtained before that work begins. The permit system exists so HDB can check that the proposed works are within the rules and will not compromise the flat or the building.
The practical principle is this: do not assume your works are permit-free. Renovation works span a wide range, and a meaningful portion of them, particularly anything touching the flat's fabric, fall under the permit requirement. The starting point for any HDB renovation is to check, against HDB's renovation guidelines, which of your intended works need a permit.
How the permit fits the timeline:
- Plan the scope. Decide what you want done, room by room.
- Check the permit requirement. Identify which works on your list require an HDB renovation permit.
- Get the permit before the work starts. Your HDB-registered renovation contractor typically assists with the permit application. The permit must be approved before the relevant work begins, not after.
- Carry out the work within the rules. Including the timing rules and the requirement to use a registered contractor.
What HDB renovation works are not allowed?
Some works are not a matter of getting a permit, they are simply not allowed at all. According to HDB, the most important prohibition concerns the flat's structural elements.
Structural elements
You cannot hack, demolish, or tamper with a structural wall or a structural column. Structural elements carry the load of the building, so altering them is not a renovation choice, it is a safety matter, and HDB does not permit it. A non-structural partition wall is treated differently from a structural wall, and part of the renovation planning process is establishing which walls in your flat are structural.
Other prohibited or restricted works
Beyond structural elements, HDB's renovation guidelines set out a range of works that are prohibited or tightly restricted, for example works that affect the building's external appearance, the common areas, or essential services. Rather than relying on memory or a contractor's word, the disciplined approach is to read HDB's renovation guidelines for the specific works you have in mind, because the not-allowed list is detailed and HDB updates it.
| Work type | General position | What to do |
|---|---|---|
| Hacking a structural wall or column | Not allowed | Do not plan it; identify structural walls before designing |
| Works requiring an HDB renovation permit | Allowed with a permit | Obtain the permit before the work starts |
| Works affecting external appearance or common areas | Prohibited or restricted | Check HDB renovation guidelines before proceeding |
| General internal works within the rules | Allowed | Still observe timing rules and use a registered contractor |
General guidance. The detailed list of permitted, restricted, and prohibited works is set by HDB, confirm against HDB's renovation guidelines.
What are the HDB renovation noise and timing rules?
Renovation is disruptive to neighbours, so HDB sets rules on when work may be carried out. According to HDB, there are designated days and hours within which renovation work, and noisy work in particular, is permitted, with tighter restrictions on the noisiest activities.
Two points matter for a renovator:
- Work must keep to the permitted days and hours. Renovation, especially noisy work such as drilling and hacking, may only be done within the windows HDB sets. This protects neighbours and is part of being a good resident.
- Plan the schedule around it. Because noisy work is time-bounded, a renovation timeline must account for those windows. Tell your contractor to schedule the loud phases within the permitted hours, and confirm the current timing rules with HDB so the schedule is realistic.
The reason to take this seriously is not only the rules, it is the relationship with the neighbours you will live alongside for years. Renovation noise at the wrong hour is a poor first impression on a new floor.
Do I have to use an HDB-registered renovation contractor?
Yes. According to HDB, renovation works in an HDB flat must be carried out by a contractor on HDB's Directory of Renovation Contractors. Using a registered contractor is a requirement, not a suggestion.
The reason is accountability. A registered contractor is one HDB recognises for HDB renovation work, and the registration system gives HDB a basis to hold contractors to the renovation rules. For you as the flat owner, choosing from the registered list is both a rule to follow and a basic protection, it keeps you away from operators outside HDB's framework.
How should I budget for an HDB renovation?
There is no standard HDB renovation cost, and any single figure quoted as "the" budget is misleading. The honest position is that renovation cost depends on several factors specific to your flat:
- The flat type and size. A larger flat has more floor area, more rooms, and more surfaces to renovate.
- The condition of the flat. A brand-new BTO flat needs different work from an older resale flat that may require more extensive updating.
- Your scope and finishes. A light refresh and a full renovation with premium finishes are very different projects, and the choice of materials swings the cost substantially.
Because of that, the disciplined approach is not to ask "what does an HDB renovation cost" but to build a worked budget for your own flat:
- Define your scope precisely, room by room, before getting quotes.
- Get itemised quotes from registered contractors, so you can compare like for like.
- Separate must-haves from nice-to-haves, so you know what to trim if the quotes come in high.
- Hold a contingency. Renovations frequently uncover surprises, especially in older flats. A buffer over the quoted figure keeps a surprise from becoming a crisis.
One financing note: a renovation is a cash and personal-financing item. CPF Ordinary Account savings can be used for the purchase and the mortgage instalments of the flat, but not for renovation costs. Budget renovation as a separate sum, funded outside CPF.
Winfred's Take
Two pieces of advice I give every owner before they renovate. First, on the rules: treat the structural-wall prohibition as absolute and the permit requirement as non-negotiable. A renovation that looks good but breaks HDB's rules is a liability, not an asset, and the structural rule exists for everyone's safety in the block. Get the design checked against HDB's guidelines before a single quote is signed. Second, on the money: do not ask anyone "what does a renovation cost" and treat the answer as your budget. Renovation cost is specific to your flat, its age, its size, and your scope. Build a real, itemised budget for your flat, fund it outside CPF because CPF cannot be used for renovation, and always carry a contingency. The owners who get into trouble are the ones who treated a casual ballpark as a plan.
FREE · 30 MINUTES · NO COMMITMENT
Planning a flat purchase with renovation on top?
We help you size the full picture, the purchase, the cash and CPF split, and a realistic renovation budget funded separately, so the project does not blow past what you can afford.
Winfred Quek · CEA R073319H · Crestbrick
Frequently asked questions
Do I need a permit to renovate my HDB flat?
Many renovation works require an HDB renovation permit, and the permit must be obtained before that work starts. Check which of your specific works need a permit against HDB's renovation guidelines; your registered contractor usually helps with the application.
Can I hack a wall in my HDB flat?
You cannot hack or tamper with a structural wall or column, this is not allowed. A non-structural partition wall is treated differently. Identify which walls are structural during the planning stage before designing any wall changes.
What are the HDB renovation timing rules?
HDB designates the days and hours within which renovation work, especially noisy work, may be carried out. Schedule loud phases within those windows and confirm the current rules with HDB.
Must I use an HDB-registered contractor?
Yes. Renovation works in an HDB flat must be carried out by a contractor on HDB's Directory of Renovation Contractors.
Can I use CPF for my HDB renovation?
No. CPF Ordinary Account savings can be used for the flat's purchase and mortgage instalments, but not for renovation costs. Budget renovation as a separate sum funded outside CPF.
The bottom line
Renovating an HDB flat in 2026 runs on three rails: get the renovation permit before the work it covers starts, never touch a structural wall or column, and keep to HDB's timing rules using an HDB-registered contractor.
On budget, drop the search for a single national figure. Build a worked, itemised budget for your own flat, fund it outside CPF, and hold a contingency. Get the rules and the money right, and the renovation becomes the good part of owning a flat rather than the part that goes wrong.
Winfred Quek is an Associate Marketing Consultant at Crestbrick Pte Ltd, advising Singapore upgraders, investors, and families. CEA R073319H. The information on this page is general and does not constitute financial, investment, or renovation advice.