HDB Renovation Rules in 2026: What Needs a Permit, and What Never Will

Search for HDB renovation rules and you'll find a dozen blogs announcing "new 2026 rules", including a supposedly new 1pm to 2pm quiet hour. We went to HDB's own published guidelines to check. We couldn't find it there. Keeping lunchtime quiet is good manners, and your neighbours will appreciate it, but don't plan your schedule around rules that only exist on someone's SEO page.

Here's what HDB actually says, and how it affects your plan.

Working hours

• General works like plastering, carpentry installation and painting: Monday to Saturday, 9am to 6pm.
• Noisy works like hacking walls and removing floor or wall finishes: Monday to Friday, 9am to 5pm only.
• No noisy works on weekends, public holidays or the eve of major public holidays. No renovation of any kind on Sundays and public holidays.

In practice this means the hacking stage has to be squeezed into weekdays, and HDB also limits how many consecutive days it can run. Good contractors group all the demolition together so the noisy part is short and your neighbours only suffer once.

The 3-year BTO toilet rule

This one catches new BTO owners every time. The toilets in a new flat have a waterproofing membrane under the tiles. HDB does not allow you to replace the toilet floor and wall finishes for 3 years from the completion date of the block, because hacking them risks leaks into the flat below.

You can still lay new floor tiles over the existing ones using adhesive. If you hate the tiles HDB gave you, overlaying is the legal route in those first three years. After that, replacing toilet finishes needs a permit.

Waterproofing isn't optional

When bathroom tiles do come off, HDB requires pre-packed waterproofing screed and a waterproofing membrane before new floor finishes go down. The membrane has to be turned up at least 150mm against the walls, kerbs and pipes. Kitchens and open balconies need pre-packed waterproofing screed too.

This is the part of a quote nobody photographs for Instagram. It's also the part that decides whether your downstairs neighbour knocks on your door a year later. Ask your contractor how they do it and whether they water-test before tiling.

What never gets approved

Structural walls, beams, columns, floor slabs and the household shelter cannot be touched. No permit, no workaround. If you've fallen in love with an open layout on Pinterest, find out which walls in your flat are structural before you fall any further.

What needs a permit

Hacking non-structural walls, replacing floor or wall finishes and bathroom works all need HDB approval before work starts. Permits can't be backdated. Applications are submitted through an HDB-registered renovation contractor, so it's worth asking who holds the registration on your job.

Window works are separate. They must be carried out by BCA-approved window contractors.

What this means for your plan

Most of these rules shape the order of work, not just what's allowed. Permits need lead time. Noisy work needs weekday slots. BTO toilets need a decision on overlay versus waiting. Sort these out at the design stage and the build runs smoothly. Discover them halfway through and you lose weeks.

Not sure what your flat allows?

Send us your floor plan and what you'd like to change through our enquiry page, or WhatsApp us. We'll tell you what's possible before you get attached to a layout that isn't.