Renovation · HDB Permits & Rules

HDB Renovation Permit Guide: Rules, Application and Hours

Quick answer: when you need an HDB renovation permit

Any hacking of walls or floor tiles, bathroom or kitchen layout changes, window works and similar structural or wet works in an HDB flat need a renovation permit. You cannot apply yourself — a contractor listed under HDB's Registered Renovation Contractors Scheme (RRCS) submits it electronically before work starts. See what needs HDB approval or request a permit-ready HDB renovation quote.

Hacking a wall, retiling a bathroom or changing your main gate in an HDB flat is regulated work. This guide covers which works need a permit and which do not, how the application actually runs through your contractor, the permitted renovation hours and noise rules, and what a make-good order means if works proceed without approval.

Which HDB works need a permit — and which do not

Renovation work	Permit?	What to check
Hacking or removing walls	Yes	Only non-structural partitions can be removed; reinforced-concrete structural walls can never be hacked, even with a permit
Hacking bathroom or kitchen floor/wall tiles	Yes	New BTO bathrooms: tile hacking is not allowed for the first 3 years (waterproofing protection)
Relocating toilet fixtures, floor traps or concealed piping	Yes	Waterproofing must be redone and ponding-tested before retiling
Replacing windows or installing grilles	Yes	Must follow HDB-approved window types and use an approved installer — check current HDB guidelines
Replacing the main door or gate	Depends	Fire-rated door requirements apply to some units along common corridors — check current HDB guidelines before buying a door
Electrical rewiring or new circuits	No HDB permit	Must still be carried out by a licensed electrical worker (EMA-licensed), not a general handyman
Painting, built-in carpentry, light fittings, same-position fixture swaps	No	Standard works; noisy drilling still falls under renovation-hours rules

The pattern: anything that touches the structure, the waterproofing layer, the building facade or concealed services needs approval; cosmetic and like-for-like works generally do not. For wall removal specifically — what can come down, what it costs beyond demolition and the mistakes to avoid — see the HDB wall hacking cost and permit guide. For budgeting the wider project, start from the renovation cost Singapore overview.

The 3-year restriction for new BTO flats

For newly completed BTO flats, hacking the bathroom floor and wall tiles is not allowed for the first 3 years. The original waterproofing membrane needs time to settle, and disturbing it early risks leaks into the unit below — so HDB will not approve a tile-hacking permit during this window. You can still do non-hacking works in that period: fixture swaps in the same position, carpentry, painting and lighting. If you are sequencing a new flat's works around key collection, the BTO renovation timeline shows where the permit step sits, and the HDB toilet renovation permit guide covers the bathroom-specific rules in more detail.

How the permit application actually works

Homeowners do not apply for the renovation permit themselves. Under HDB rules, the application is submitted electronically by a contractor listed under HDB's Registered Renovation Contractors Scheme (RRCS), through HDB's renovation permit application system (APEX). The contractor declares the scope of works and takes responsibility for carrying them out within the approved terms.

Who applies: your RRCS-listed renovation contractor, not you. If a contractor asks you to skip the permit, treat that as a red flag.
Approval time: straightforward applications are typically approved within about 3 working days; scopes that need further review can take longer. Build this into your timeline before booking hacking crews.
Validity: the permit states a completion window — commonly around 1 to 3 months depending on scope. Works must finish within it, and extensions have to be requested, not assumed.
Display: the approval notice is displayed at the flat for the renovation period so neighbours and HDB officers can verify the works are authorised.

Exact processing times, validity periods and documentation requirements can change — check current HDB guidelines or ask your contractor to show the approval before any hacking starts. Official reference: HDB renovation guidelines.

Renovation hours and noise rules

General works: permitted only during daytime hours on weekdays and Saturdays.
No work on Sundays and public holidays: this applies to all renovation works, not just noisy ones.
Noisy works such as hacking, heavy drilling and demolition are further restricted to weekday daytime hours and are expected to be completed within the first few days of the renovation period, so neighbours are not exposed to weeks of hacking noise.
Neighbour notice: contractors are expected to notify surrounding units before noisy works begin.
Debris: renovation debris must be removed properly, not dumped at void decks or common areas.

The exact clock timings and the noisy-works day limit are set by HDB and can be tightened over time — confirm the current figures in HDB's renovation guidelines before your contractor schedules hacking days.

What happens if you renovate without a permit

Unauthorised renovation is not a paperwork technicality. If HDB finds works done without approval — a hacked wall, retiled bathroom within the restriction period, an unapproved window change — it can issue a make-good order requiring you to reinstate the flat to its approved condition at your own cost. That can mean rebuilding a wall you paid to demolish. Contractors who carry out unauthorised works face demerit points or delisting under the RRCS, and unresolved unauthorised works can surface during a resale, complicating the sale. The permit is cheap insurance by comparison: a compliant contractor folds the application into the job, so there is no upside to skipping it.

Frequently Asked Questions

Do I need an HDB permit to hack a wall?

Yes. Removing any wall in an HDB flat requires an HDB renovation permit, and reinforced-concrete structural walls can never be hacked even with one. The permit must be obtained by an HDB-registered renovation contractor before demolition starts.

Can I apply for the HDB renovation permit myself?

No. Permit applications are submitted electronically by a contractor listed under HDB's Registered Renovation Contractors Scheme (RRCS), through HDB's renovation permit application system (APEX). A reputable contractor handles this as part of the job.

How long does HDB renovation permit approval take?

Straightforward applications are typically approved within about 3 working days, while scopes that need further review can take longer. The permit states a validity period — commonly around 1 to 3 months — within which the approved works must be completed.

What are the permitted HDB renovation hours?

General renovation works are limited to daytime hours on weekdays and Saturdays, with no works on Sundays and public holidays. Noisy works such as hacking and heavy drilling are further restricted to weekday daytime hours and are expected to be completed early in the renovation period. Check current HDB guidelines for the exact timings.

What happens if I renovate without a permit?

HDB can issue a make-good order requiring you to reinstate the unauthorised works at your own cost. Contractors face demerit points or delisting under the RRCS, and unauthorised works can complicate a future resale. Always confirm the permit is approved before work starts.

Pre-renovation permit checklist

Run through this before signing a renovation contract or booking hacking crews:

Confirm the contractor is listed under HDB's RRCS
Mark every wall to be hacked on a floor plan
Confirm none of the marked walls are structural
BTO flats: check the 3-year bathroom restriction has lapsed
Ask who submits the permit and when
Sight the permit approval before any hacking starts
Check the validity window covers your full timeline
Schedule noisy works early, on weekdays only
Assign electrical works to a licensed electrical worker
Get scope, exclusions and make-good responsibility in writing

A quote that itemises the permit scope up-front is easier to compare and far less likely to produce mid-project "extras". The written contract should state who is responsible for the application, compliance during works and any reinstatement.

Planning an HDB renovation? Get a permit-ready quote

Send your floor plan and scope, and get an itemised quote that states the permit handling, hacking scope, make-good and timeline in writing.

Request an itemised quote Send renovation brief

An HDB renovation permit protects the block's structure and your neighbours, and it protects you: an approved scope, a listed contractor and documented compliance are what stand between a smooth handover and a make-good order. Keep a copy of the approval and the as-completed scope with your renovation records.

Related Resources

Sequence the permit into your renovation timeline

The permit is a dependency, not a formality: hacking, wet works and window changes cannot legally start before approval, so the application should go in as soon as the floor plan and scope are frozen. A common planning failure is booking hacking crews for the week after key collection, then discovering the application has not been submitted. Lock the sequence as: finalise scope, contractor submits, approval sighted, then demolition — and keep the noisy works inside the earliest weekdays of the approved window.

Resale flats: check what the previous owner did

Buying a resale flat means inheriting its renovation history. Walls that were moved, bathrooms that were retiled or doors that were changed by a previous owner may or may not have been approved at the time. Before planning your own works, compare the flat against the approved floor plan and flag any differences to your contractor — an unauthorised legacy alteration discovered mid-renovation can stall the project while it is regularised or made good. This is also why hacking quotes for resale flats include a site check before demolition is confirmed.

Condo and landed rules are different

This guide covers HDB flats. Condominium renovations run through the MCST's house rules and deposit system rather than an HDB permit, and landed or commercial works may need a qualified person or authority submissions depending on scope. Do not carry HDB assumptions across property types — confirm the actual approval route for the building before committing to a start date.

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