HDB Renovation Timeline: BTO vs Resale
Most HDB renovations run somewhere between one and three months on site — but that range is set less by your design than by two things: whether you are renovating a new BTO or a resale flat, and HDB’s permit completion window, which is a hard deadline rather than a guideline.
The permit clock: your real deadline
Once HDB issues your renovation permit, the works must be completed within a fixed window. As a general rule:
- Newly completed blocks (new BTO): 3 months from the permit date
- Existing blocks (resale / older flats): 1 month
- Minor works: 2 weeks
This is the most misunderstood part of HDB renovation planning. A resale flat gets the shorter window despite usually needing more work — which is why resale projects need tighter sequencing and the scope settled before the permit is filed. Always confirm the window stated on your own permit.
BTO vs resale: why the timelines differ
New BTO flat
You are starting from a bare, never-lived-in unit. There is nothing to demolish, so the job goes almost straight to carpentry, finishes and installation. The complication is the 3-year restriction: in newly completed blocks the original bathroom and toilet wall and floor finishes cannot be removed for the first three years, which pushes most first renovations toward overlay solutions in the bathrooms.
Resale flat
You are renovating a home someone has lived in, and the old has to come out before the new goes in. Time goes into hacking out the old kitchen, bathrooms and built-ins; re-wiring where the electrical runs are dated; re-piping and re-waterproofing where old work has failed; and dealing with previous owners’ undocumented alterations. Wider scope, more unknowns — and a shorter permit window.
The realistic phase order
The sequence is not flexible — each phase depends on the one before it:
- Protection and demolition — hacking, removal, debris clearance
- Wet works — plumbing, waterproofing, tiling, screeding. This phase sets the pace and cannot be rushed or run out of order.
- Electrical and services — rewiring, points, lighting circuits
- Ceiling and partitions — false ceilings, feature walls
- Carpentry — kitchen cabinetry, wardrobes, built-ins. Usually the longest lead time, and fabricated off-site.
- Finishes — painting, flooring, fittings
- Testing and handover — including the mandatory water test on any bathroom where the floor finish was replaced
The most common planning error is treating carpentry as a late-stage detail. It is fabricated off-site with real lead times, so it must be confirmed early or it becomes the bottleneck at the end.
What legally controls your schedule
These are HDB rules, not contractor preferences, and they directly shrink the working week:
- General renovation hours run Mondays to Saturdays, roughly 9am to 6pm.
- Noisy works (hacking, drilling, demolition) are weekday-only, roughly 9am to 5pm — not permitted on Saturdays, Sundays, public holidays or the eves of major festivals.
- Demolition is capped at 3 days in total.
- Neighbour notice — units within two doors must be given written notice before noisy works begin.
- Only contractors in HDB’s Directory of Renovation Contractors may carry out works, including items needing no permit.
The arithmetic matters: a “one-month” resale renovation is really about twenty working days, and only some of those can be noisy. Full details are in our HDB renovation rules guide.
Does flat type change the timeline?
The permit window is the same; what scales is the volume of work. 2-Room and 3-Room flats are usually fastest. 4-Room is the common baseline. 5-Room, Executive and maisonettes mean more flooring, more carpentry runs, more bathrooms and — for maisonettes — two levels and a staircase to sequence. See the scope differences by flat type.
Where projects actually lose time
- Scope discovered after hacking on resale flats — failed waterproofing, dated wiring, undocumented alterations
- Permit items found late, resetting the plan
- Carpentry lead times confirmed too late
- Material availability on long order
- Decision delays — the most common cause, and the most avoidable
Frequently asked questions
How long does an HDB renovation take?
Most run one to three months on site. The binding constraint is HDB’s permit completion window — generally 3 months for newly completed blocks, 1 month for existing blocks, and 2 weeks for minor works.
Why does a resale flat take longer than a BTO?
A resale flat has to be stripped before it can be rebuilt, and older units often need re-wiring, re-piping or re-waterproofing that only surfaces once work starts.
Can renovation work be done on Sundays?
No. Noisy works are weekday-only, and general renovation work is not permitted on Sundays or public holidays.
Can I renovate my new BTO’s bathrooms straight away?
You can renovate, but in newly completed blocks the original bathroom wall and floor finishes cannot be removed for the first 3 years.
Plan it with an HDB-Approved Contractor
Tell us your flat type and whether it is a BTO or resale unit, and we will tell you exactly what is available to you before any design work starts.
FC Interior Design — HDB-Approved Contractor (licence HB-09-2619C), Singapore since 1990.
Call +65 6444 0555 or WhatsApp +65 9888 2723.
More HDB renovation guides
Browse the full library in our HDB renovation guides hub — covering permits and rules, BTO vs resale timelines, kitchen layouts, bathrooms, 4-Room BTO, design styles and space planning.
Planning the works next? See our BTO renovation packages and resale HDB renovation packages for scope and indicative pricing.