When is hacking allowed in an HDB flat?

Only on weekdays. MND states hacking may use up to two approved handheld power tools at a time and must be completed within three days, with the flat's doors and windows kept closed.

How much notice must neighbours get before HDB renovation works?

Contractors must inform households within a radius of two flats, including the upper and lower floor neighbours, at least three days before works begin, and put up a Notice of Renovation Works outside the flat showing contact details, duration and hacking dates.

What happens if a contractor breaks HDB renovation rules?

HDB can impose a financial penalty or demerit points and can debar contractors who exceed the demerit threshold or commit serious infringements. MND reported 52 infringements out of 63,642 permits in 2019.

HDB Guide

HDB Hacking and Noise Rules for Reinstatement Works: Permits, Notices and Timing

By Mr Kobayashi, Operations Lead, REINSTATE.by MCSG · Published 1 November 2026 · 6 min read

In an HDB flat, hacking of floors or walls needs an HDB renovation permit and a contractor listed in HDB's Directory of Renovation Contractors, can only be done on weekdays, and must be completed within three days. Neighbours within two flats, including the units above and below, must be told at least three days before works start.

Most HDB reinstatement is quiet work: patching drill holes, repainting, taking down shelves. The noisy part comes when a tenant or previous owner laid new tiles, built a wall or removed one, and the landlord wants it put back. That is when HDB's renovation rules decide who can do the job, when the hammers can run and how much notice the block gets. This guide explains those rules from a reinstatement point of view, so the noisy days fit inside your handover window instead of pushing it out.

Which reinstatement works does HDB actually regulate?

HDB regulates works that could affect the structure of the block, such as demolishing walls and hacking flooring. These need an HDB renovation permit and a contractor from HDB's Directory of Renovation Contractors (DRC). Works that do not touch the structure, such as carpentry or installing light fixtures, are not regulated by HDB and need no HDB permit.

That split comes from the Ministry of National Development's written answer to Parliament on 6 July 2021, which says certain works "require a renovation permit from HDB, and must be conducted by a contractor listed in the HDB Directory of Renovation Contractors". For a reinstatement job, it means you sort the scope into two piles before you book anyone. Our guide on when you need an HDB-registered contractor goes deeper on the DRC itself.

Typical reinstatement task	HDB permit and DRC contractor?	Noise rules that apply
Hacking floor tiles laid by the tenant	Yes	Weekdays only, two approved handheld power tools, finish within three days
Demolishing or rebuilding a wall	Yes	Same hacking rules as above
Removing built-in carpentry or shelves	No HDB permit	Not regulated by HDB; neighbours should still be told
Removing or relocating light fixtures and power points	No HDB permit	Not regulated by HDB; the electrical work itself needs a licensed electrical worker

Permit and noise rules as described by MND in its July 2021 written answers. HDB updates its renovation guidelines from time to time, so confirm the conditions printed on your own permit. For non-HDB trades, see our guides to removing built-in carpentry and licensed electrical workers for reinstatement.

When can hacking be done in an HDB flat?

Only on weekdays, and the hacking must be completed within three days. MND states that hacking can use only up to two approved handheld power tools at any one time, and contractors must keep the flat's doors and windows closed while working. Weekends are not available for hacking, so plan the noisy days early.

The three-day limit is the number that matters most for a handover. Hacking out a living room of tiles in a 4-room flat is usually a one to two day job for an experienced crew, but debris removal, screeding and new tiling follow, and those trades need drying time. If the lease ends on a Monday, the hacking cannot run over the weekend before it. Our 30-day end-of-lease countdown shows where the permit and noisy works should sit, and how long reinstatement takes gives typical durations for each trade.

Daily working hours are set out in HDB's renovation guidelines and on the permit, so ask the contractor to show you the approved hacking dates before you agree a handover date with the landlord.

Who has to be told before the works start?

Households within a radius of two flats of the unit, including the upper and lower floor neighbours, must be informed at least three days before works begin. The contractor must also put up a Notice of Renovation Works outside the flat showing its contact details, the renovation period and the hacking dates, and approved works appear on the OneService App.

MND set this out in the same July 2021 answers, noting that since that month HDB residents "will be able to receive and view notices for upcoming flat renovation works at their blocks" through the OneService App. In practice this adds three days to the front of any noisy reinstatement. Count the notice period, then the permit approval, then the three hacking days, and the earliest realistic finish is often a week or more after you sign the quotation.

Agree the reinstatement scope with the landlord in writing, listing exactly which tiles or walls must be restored.
Engage a DRC-listed contractor and let them apply for the HDB renovation permit.
Have the contractor notify neighbours within two flats at least three days ahead and post the Notice of Renovation Works.
Schedule hacking on consecutive weekdays, finishing within three days.
Follow with tiling, plastering and painting, then book the joint inspection.

What happens if a contractor breaks HDB's renovation rules?

HDB can impose a financial penalty, demerit points, or debar a contractor who exceeds the demerit threshold or commits a serious infringement. Breaches are rare relative to volume: MND reported 52 infringements out of 63,642 HDB renovation permits in 2019, and 53 out of 76,340 permits between April 2020 and May 2021.

That works out to fewer than one infringement per 1,000 permits, which tells you most listed contractors follow the rules. The risk for a landlord or tenant is less about penalties and more about delay. If unauthorised works are found during reinstatement, such as a wall that was removed without approval, HDB may need to approve the rectification before the flat can be handed back. That can push the handover date and your deposit refund back by weeks. Our HDB reinstatement guide covers what tenants are usually required to restore.

Residents with feedback on renovation works can contact HDB's branch service line at 1800-225-5432, according to MND. If you are the tenant doing the works, keeping your contractor's permit and notice handy is the quickest way to settle a neighbour's complaint.

Are the noise rules different for condos and landed homes?

Yes. Condominium renovation noise is managed by each estate's management corporation under its by-laws, while NEA regulates noise from additions and alterations works in landed properties. HDB's hacking rules only apply inside HDB flats. For landed sites, NEA's daytime limit near homes is 90 dBA over any 5 minutes from Monday to Saturday.

NEA's construction noise page sets limits for residential buildings within 150m of a worksite: 90 dBA (Leq 5 minutes) and 75 dBA (Leq 12 hours) between 7am and 7pm on Mondays to Saturdays, falling to 70 dBA (Leq 5 minutes) between 7pm and 10pm. On Sundays and public holidays the daytime 5-minute limit drops to 75 dBA. For a condo, the permitted hours sit in the MCST by-laws, which we explain in our guide to MCST permits for reinstatement works. For houses, see landed property reinstatement.

How do you keep noisy reinstatement from delaying the handover?

Start the permit and neighbour notice at least two weeks before the lease ends, and put the hacking on the first available weekdays. Quiet trades such as painting, carpentry removal and cleaning can fill the gaps, but tiling cannot start until hacking and debris clearance are done, so the noisy work sets the pace of the whole job.

Two habits help. First, ask for a programme with dates, not just a quotation, and check that the hacking days fall on weekdays. Second, if the tenant's new tiles are sound and the landlord is happy with them, get that acceptance in writing and skip the hacking entirely. Many disputes about flooring reinstatement end that way, because a well-laid floor is often worth more to the owner than the original one.

Need tiles or walls restored in an HDB flat?

Send us the block, flat type, what needs hacking and your handover date. We'll plan the permit, the neighbour notice and the hacking days so the works finish before you hand over.

WhatsApp us for a quote →

HDB permit, hacking, notice and enforcement rules, and the infringement figures, are from two Ministry of National Development written answers to Parliament dated 6 July 2021. Landed property and condominium responsibilities are from NEA's page on noise from renovation work in residential areas. Noise limits are from NEA's construction noise control page. Hacking durations and planning advice are from our own project experience, not regulated figures.

References & further reading

Authoritative Singapore sources for further reading. This guide is general information, not legal advice. Confirm current rules with HDB, NEA or your MCST and the conditions on your renovation permit.