Every HDB renovation in Singapore requires a permit before any physical work begins. This is not optional and it is not a formality. Work carried out without a valid HDB renovation permit exposes the homeowner to fines, mandatory rectification at their own cost and in serious cases the undoing of completed renovation works. Contractors who suggest starting before the permit arrives are not doing you a favour.
This guide explains how the HDB renovation permit process works in 2026, what requires a permit, what the common mistakes are and what every homeowner should know before their contractor picks up a tool. From the team at RS Carpentry, an HDB-registered contractor that handles permit applications as a standard part of every renovation engagement.
What Is an HDB Renovation Permit
An HDB renovation permit is an approval issued by the Housing and Development Board that authorises specific renovation works to be carried out in an HDB flat. It is not a single blanket approval for all renovation. Different works require different permit categories and some works require specific licensed professionals beyond the general renovation contractor.
Only HDB Registered Renovation Contractors can apply for the permit. If your contractor is not HDB-registered, they cannot legally apply for you. This is one of the main reasons homeowners should verify HDB registration before signing anything. RS Carpentry’s registration number is HB-05-5960D and you can verify it on the HDB renovation portal directly.
Which Renovation Works Require a Permit
Most significant renovation works require an HDB renovation permit. These include:
- Hacking of any wall, whether structural or non-structural
- Replacing or removing floor finishes in any room
- Waterproofing works in bathrooms and toilets
- Any plumbing modification including relocating points or replacing pipes
- Electrical works above basic like-for-like replacement
- Demolition or construction of internal partitions
- Replacement of window frames or grilles
- Installation of air conditioning systems
- Any works to the household shelter
Works that do not require a permit include painting over existing surfaces, replacing light fittings on a like-for-like basis, replacing switches and sockets on a like-for-like basis and installing freestanding furniture. If there is any doubt about whether a specific work requires a permit, the correct answer is to check rather than assume.
How Long the HDB Permit Takes
The HDB renovation permit application is submitted online by the contractor through HDB’s e-permit system. Approval typically takes two to five working days for straightforward applications. Applications involving structural changes or certain wet works may take longer and may require additional documentation.
Permit approval is also contingent on a neighbour notification period. HDB requires that immediate neighbours (those sharing a wall with the unit) be notified before noisy renovation works begin. The contractor handles this notification as part of the permit process. Neighbours have three working days to raise objections before work can commence.
This means the realistic minimum from permit application to being allowed to start noisy works is around seven to ten working days. Any timeline that has hacking starting the day after signing should prompt a question about whether the permit has actually been obtained.
Renovation Permitted Hours
HDB renovation is only permitted during specific hours. This affects your project timeline more than most homeowners plan for:
- General renovation works: 9am to 6pm on weekdays and Saturdays
- Noisy works (hacking, drilling, power tools): 9am to 5pm on weekdays and Saturdays only
- No renovation works at all: Sundays and public holidays
During festive periods including Chinese New Year and Hari Raya, additional restrictions apply and some estates have their own supplementary rules. Contractors working outside permitted hours risk being reported by neighbours, fined by HDB and having the permit suspended. A project manager who tells you work will continue over a public holiday weekend is not being honest about how the permit system works.
What Happens If You Renovate Without a Permit
HDB takes unpermitted renovation works seriously. The consequences for homeowners include:
- Fines of up to S$5,000 for minor violations
- Mandatory reinstatement of unpermitted works at the homeowner’s cost
- Forfeiture of the flat in extreme cases involving structural damage
- Difficulty selling the flat if unpermitted works are discovered during the buyer’s due diligence
Unpermitted works also affect the homeowner’s CPF refund obligations if the flat is sold within a certain period. The financial and legal exposure from bypassing the permit process is significantly larger than the administrative inconvenience of following it properly.
Key HDB Renovation Rules Every Homeowner Should Know
Beyond the permit process, HDB has specific rules governing what can and cannot be done inside a flat:
- Structural walls cannot be hacked under any circumstances regardless of who approves it
- Floor tiles cannot be overlaid more than once. If the existing floor already has an overlay on top of original tiles, the only option is full hacking
- The household shelter cannot be drilled into, permanently modified or used as a wet area. Our guide on bomb shelter storage Singapore covers what is and is not permitted
- Wet areas must be waterproofed to HDB specifications. Using the wrong waterproofing product or skipping the flood test makes the work non-compliant
- Electrical works must be carried out by a licensed electrician and certain works require SP PowerGrid sign-off
- Gas works require a Corgi-equivalent licensed gas service worker and SP Gas sign-off
Common Permit-Related Problems and How to Avoid Them
Starting work before the permit is approved is the most common and most avoidable problem. It usually happens when a homeowner is eager to start and a contractor accommodates them by beginning preparatory work that quickly escalates into actual renovation.
The second most common problem is scope creep that was not included in the original permit application. If you decide mid-renovation to hack an additional wall that was not in the approved permit, the contractor must submit a permit amendment before that work proceeds. Doing it without the amendment puts the whole permit at risk.
For the full picture of renovation planning before work starts, our pre-renovation checklist Singapore covers permits alongside materials, electrical planning and contractor paperwork. And for how to read the quotation that goes alongside the permit application, our renovation quotation guide explains what should appear line by line.
What to Ask Your Contractor About Permits
- What is your HDB licence number and can I verify it now?
- Will you apply for the permit before any site work begins?
- How long does permit approval typically take for a project like mine?
- Will the permit cover the full scope of work in the quotation?
- What happens if we want to add scope mid-project?
Contact RS Carpentry and we will walk through the full permit process as part of the initial consultation. Permit application is handled by our team as standard. Browse our completed renovation projects to see the output of properly permitted renovation work across Singapore.
