Renovating your HDB flat sounds exciting — until you actually start. Between choosing a contractor, waiting for permits, and dealing with delays you never saw coming, most first-time renovators are surprised by how long the whole process really takes. Here’s an honest, realistic timeline, plus the things nobody tells you before you sign that first quotation.
How Long Does an HDB Renovation Actually Take?
For a standard 4-room resale flat, a full renovation usually takes 8 to 12 weeks from the day work starts on site. But that number is misleading, because it doesn’t include everything that happens before the first hammer is picked up.
Add in planning, quotations, and HDB permit approval, and the realistic timeline from “I want to renovate” to “I’m moving in” is closer to 4 to 6 months.
Stage 1: Planning and Getting Quotations (3–6 weeks)
This stage always takes longer than people expect. You’ll want to get quotations from at least 3 contractors so you can compare pricing and scope properly.
- Shortlist contractors and check their HDB registration status
- Arrange site visits so they can measure and assess your flat
- Wait for detailed quotations — this can take 1–2 weeks per contractor
- Compare scope of work carefully, not just the final price
What no one tells you: the cheapest quotation is often missing items that get added later as “additional work,” which ends up costing more than a slightly higher quote that included everything upfront.
Stage 2: HDB Permit Approval (1–3 weeks)
Before any hacking or major work begins, your contractor needs to submit a renovation permit to HDB. This covers things like hacking walls, changing flooring, or altering the layout. Simple permits can be approved within a few days, but anything involving structural changes takes longer.
Tip: Don’t let any contractor start hacking work before the permit is approved. This is one of the most common causes of fines and forced work stoppages.
Stage 3: Hacking and Structural Work (1–2 weeks)
This is the loud, dusty part — removing old tiles, walls, or built-in furniture. HDB only allows hacking work during specific hours on weekdays and Saturdays, so this stage can drag on if your contractor doesn’t manage the schedule well.
Stage 4: Electrical, Plumbing, and Masonry (2–3 weeks)
This is where most of the “invisible” work happens — new wiring, plumbing for the kitchen and bathrooms, and any wall or floor levelling. It’s also the stage where changes are hardest to make later, so this is your last real chance to confirm socket positions, lighting points, and water points.
What no one tells you: once the walls are closed up, moving a socket or light switch means re-opening finished work. Walk through every room with your contractor before this stage is signed off.
Stage 5: Carpentry (3–4 weeks)
Custom carpentry — wardrobes, kitchen cabinets, shoe cabinets — is usually the longest single stage. Carpentry is made off-site and then installed, so delays here are common, especially if you change your design partway through.
Tip: Finalise your carpentry design early. Every change after the measurements are taken adds days, sometimes weeks, to this stage.
Stage 6: Painting, Flooring, and Finishing (1–2 weeks)
Painting and final flooring usually happen after carpentry is installed, so any dust from installation doesn’t ruin fresh paint. This stage moves fast, but rushing it is where sloppy finishing tends to show up.
Stage 7: Final Touch-Ups and Handover (1 week)
Before accepting handover, walk through the entire flat with a checklist. Check every socket, every cabinet door, every tap. Small defects are far easier to fix before your contractor packs up and moves on to their next project.
3 Things Nobody Tells First-Time Renovators
- Add a buffer of at least 2–3 weeks to whatever timeline your contractor gives you. Material delays, weather, and manpower shortages are common.
- You’ll need somewhere to stay during the noisiest weeks — factor this into your budget and moving plans early.
- Set aside 10–15% extra budget for unexpected issues, like discovering old wiring or uneven flooring once hacking begins.
Final Thoughts
An HDB renovation is rarely as fast as the glossy show flats make it look. If you go in expecting 4 to 6 months from planning to move-in, build in a buffer, and lock down your carpentry design early, you’ll avoid most of the stress that catches first-time renovators off guard.