The Golden Rule: Use an HDB-Licensed Contractor

The Housing & Development (Renovation Control) Rules require that you engage a contractor listed in HDB's Directory of Renovation Contractors (DRC) for all renovation works in your flat. This is not optional — unlicensed contractors cannot legally carry out HDB renovations, and the flat owner is responsible if works are done outside the rules.

You can search the DRC on the HDB website. When interviewing contractors, ask to see their DRC registration and check the expiry date. The contractor — not you — is responsible for applying for any required HDB renovation permit, but you are responsible for ensuring they actually do.

Do You Need a Renovation Permit?

Not all renovation works in an HDB flat require a permit — some can proceed under general HDB guidelines without a formal application. The key principle: works that are structurally significant, affect shared systems (waterproofing, sanitation, gas), or generate substantial noise and dust typically require a permit, while purely cosmetic changes generally do not.

Your licensed contractor knows which category your planned works fall into. As a homeowner, treat the table below as a starting-point guide and always confirm the current requirements with HDB and your contractor before works begin, as rules can be updated.

Permitted Working Hours

Renovation noise is tightly regulated in HDB estates to protect residents. HDB divides works into two tiers, each with its own time restrictions (as of 2026 — verify current rules with HDB):

No renovation works — general or restricted — are allowed on Sundays, Public Holidays, or the eves of major public holidays (New Year's Day, Chinese New Year, Deepavali, Hari Raya Puasa, and Christmas Day).

For DIY work that involves drilling or hammering, HDB advises avoiding these activities from 10:30 pm to 7:00 am, as the noise disturbs neighbours.

Notifying Your Neighbours

HDB requires you to inform your immediate neighbours before renovation works begin. This is both a courtesy obligation and a formal requirement. The standard practice is to notify at least the units directly above, below, and on either side of your flat.

Your contractor should provide a written renovation notice that you slip under neighbouring doors. The notice typically states who you are, which flat is being renovated, the expected start and end dates, and the contractor's contact details. This gives neighbours a channel to raise concerns before work starts rather than escalating to HDB while works are underway.

Special Rules for New Flats (Under 3 Years Old)

If you have recently collected your keys from HDB — whether a BTO or a new resale flat — there is an important restriction to be aware of. Newly built HDB flats have a 3-year restriction period during which you cannot remove the original wall and floor finishes in bathrooms and toilets.

The reason is practical: HDB's waterproofing warranty covers these wet areas for a defined period, and hacking out the original tiles during that window can void or complicate warranty claims if water-seepage issues arise later. You may overlay new tiles on top of the original finishes in some situations, but the rules around this are specific. Confirm exactly what is and is not allowed with your licensed contractor and with HDB before proceeding.

The Renovation Permit Application Process

The renovation permit application is submitted electronically by your licensed contractor — not by you as the homeowner. That said, you should understand the process so you can verify it is happening correctly:

1. Engage a DRC-listed contractor and agree on the scope of works.
2. Contractor submits the permit application online to HDB, with supporting documents (including floor plans for structural works).
3. HDB reviews and issues the permit. For straightforward works, this can be quick; for more complex applications (wall demolition, plumbing changes), allow more time.
4. Works commence only after permit is issued. Starting works before permit approval is a violation.
5. Contractor carries the permit on site during the renovation period and must produce it on request.
6. Post-completion inspection may be required for certain work types.

As the flat owner, make sure you receive a copy of the approved permit before any noisy or structural works begin. If your contractor is vague about whether a permit was actually applied for and approved, that is a red flag — see our guide on hidden renovation pitfalls for more warning signs.

Works That Are Never Allowed

Regardless of permit status, some works are simply prohibited in HDB flats. Key examples include:

• Hacking or altering structural reinforced concrete (RC) walls, columns, and beams — these carry the building's load.
• Hacking, altering, or installing any openings in the household shelter (bomb shelter) walls or door — these are regulated structures with specific requirements.
• Cutting, hacking, or coring through the floor slab without BCA/HDB involvement and a Professional Engineer.
• Altering common property — corridors, stairwells, external facades, shared pipelines.
• Works that obstruct fire safety equipment such as sprinkler heads, smoke detectors, or emergency lighting.

If you are unsure whether a wall is structural, do not guess — get a copy of the structural drawings from HDB and consult a Professional Engineer. See our deeper dive in hacking and partition walls for the full picture.

Planning Your Renovation Layout Before Works Begin

One of the most common and costly renovation mistakes is committing to a contractor scope before you have finalized your layout. Variation orders mid-project are expensive. Before you brief your contractor, spend time working out exactly which walls stay, where your furniture goes, and how the space will actually function for your household.

StoreySG lets you upload your actual HDB floor plan and rebuild it at true millimetre scale in the browser — no installation, no powerful PC needed. You can test layout options in 2D and 3D, move walls around to explore what is structurally plausible, and export a dimensioned DXF floor plan to share with your contractor. Arriving at site briefings with a to-scale plan rather than a sketch reduces misunderstandings and keeps your scope tight. Pair that with the permit checklist above and you are starting your renovation on solid ground.

For more on the Singapore renovation journey, see our guides on interior designer vs. contractor and condo MCST renovation approval.

This guide reflects HDB rules as understood in June 2026. Renovation regulations can change — always verify current requirements with HDB directly and with your HDB-licensed contractor before committing to any works.