Renovation Process
The HDB rules that change what you can actually build
What needs an HDB permit, the two different sets of renovation hours, and the 3-year bathroom restriction that runs from the block's completion date — not from your key collection.
Search for HDB renovation rules and you'll find a dozen blogs with slightly different answers. Renovation stops at 5pm — no, 6pm. Not on Saturdays — no, Saturdays are fine. Most of them are copying each other.
The confusion has a specific cause, and once you see it the rules are simple.
There are two sets of hours, not one
HDB splits renovation into general work and restricted work, and gives them different hours. Almost every article that gets this wrong has picked one set and presented it as the whole rule.
| General renovation | Restricted works | |
|---|---|---|
| Hours | 9am – 6pm | 9am – 5pm |
| Days | Mondays to Saturdays | Weekdays only |
| Sundays & public holidays | Not allowed | Not allowed |
| Eves of major holidays | — | Not allowed |
Restricted works are the loud ones: demolishing walls, removing wall or floor finishes, cutting tiles, and heavy or excessive drilling. Those are weekdays only, finishing an hour earlier, and additionally barred on the eves of New Year's Day, Chinese New Year, Deepavali, Hari Raya Puasa and Christmas Day.
Everything else — carpentry installation, painting, electrical, plumbing, tidying — runs to 6pm and may happen on Saturdays.
So both answers you found online were right. They were answering different questions.
The practical consequence: hacking is the bottleneck. If your renovation involves demolition, that portion can only progress five days a week, and a stretch of public holidays can quietly cost you a week. When a contractor's timeline looks optimistic, this is usually where it breaks.
The 3-year rule that ends a lot of bathroom plans
This one catches new BTO owners more than any other, because it contradicts the thing they were planning to do first.
HDB states plainly: "Newly built flats have a 3-year restriction period in place for the removal of wall and floor finishes in bathrooms and toilets."
That means you cannot hack off the tiles HDB gave you and start again. Not because it's discouraged — because it isn't permitted.
Two details matter enormously, and both are routinely got wrong.
The three years run from the block's completion date, not from your key collection. These are not the same date, and the gap between them is often substantial. If your block reached completion well before your keys were handed over, part of that window has already elapsed — so check the block's completion date rather than counting from the day you collected.
You can overlay. The restriction is on removing the existing finishes. Laying new floor finishes over the existing ones using adhesives is permitted. So a new bathroom floor is achievable inside the 3 years; a hacked-out-and-rebuilt one is not.
The reason is worth knowing, because it tells you why nobody will bend it: a waterproofing membrane sits beneath the screed and tiles in every wet area, and it's what stops water reaching the flat below. Hacking through it in year one is how you end up with a neighbour's ceiling and a dispute you will lose.
What actually needs a permit
Not everything. HDB requires a permit for defined categories — the ones with structural or safety consequences. Demolition of walls is evaluated by HDB rather than waved through. Certain electrical work needs a permit, including installing new 15-amp power points in flats without higher electrical loading.
Your contractor submits the application, along with the flat's floor plan marked with the proposed work. This is normal and they should not need reminding.
Three requirements sit alongside it, and they're specific about who may do the work:
- Electrical work must be done by an EMA-licensed electrical worker
- Air-conditioner installation must be done by a BCA-trained installer
- All window work must be done by a BCA-approved window contractor
These aren't preferences. A contractor who is vague about which of these apply to your job is telling you something.
The 30-day myth
You'll see it repeated across several renovation blogs: that HDB requires you to wait 30 days after key collection before applying for a renovation permit.
We went looking for this on HDB's own material and could not find it stated anywhere. It appears to be a garbled version of separate guidance about the defects reporting period, which is a different thing serving a different purpose.
We're flagging it rather than asserting the opposite, because absence of evidence on a website isn't proof — if you've been told this by HDB directly, believe HDB and not us. But don't rearrange your renovation schedule around a rule you found only on contractor blogs. Confirm it with HDB or with your contractor, who submits these applications routinely.
That advice generalises. Every rule on this page is checkable on hdb.gov.sg, and anything about your own flat that materially affects cost or timeline is worth the two minutes to confirm at source — including this article.
What this changes about your planning
If you're deciding what to do first: your kitchen, carpentry, painting and electrical can proceed on the normal schedule. Your bathroom probably can't be hacked yet, and an overlay is the route that works inside the restriction.
Our renovation packages are scoped around what's actually permitted in a new flat rather than what looks good in a moodboard, and each one sets out exactly what it covers.
If you're still working out how the numbers are arrived at, the quote checklist covers what to verify before you commit.
Rules on this page were checked against hdb.gov.sg in July 2026. HDB updates its guidelines — verify anything that affects your schedule or budget at source before relying on it.