You collect your keys on a Friday, full of plans, and by Monday you’ve hit the first hard truth: nobody can swing a hammer in your new flat yet. Not legally. The contractor still needs an approved permit, and HDB can take up to three weeks to issue one when the job involves hacking. That gap catches almost every new BTO owner off guard.

So before you fall in love with a moodboard, get familiar with the BTO renovation timeline as it actually plays out on the ground. Most full renovations run four to eight weeks of site works, and the order is not flexible. At Reno Bros we’ve run this sequence enough times to know where the real waiting happens, and where owners lose weeks they didn’t need to.

Week 0: Permit first, or nothing moves

Your contractor must be listed in HDB’s Directory of Renovation Contractors (DRC) and files the renovation permit on your behalf. You cannot apply yourself, and you cannot start works before it’s approved. Straightforward jobs clear in a few working days; anything involving hacking of walls or floor finishes can take up to three weeks.

Here’s the part people miss. A new BTO is handed over fairly bare, so you’re often not hacking much at all, which means a simpler permit and faster approval. Design around what’s there and you can shave a week off the start.

One more rule shapes the schedule: noisy works such as wall demolition, tile removal and heavy drilling are only allowed 9am to 5pm on weekdays, never on weekends or public holidays, and HDB caps them at three consecutive days. That’s why hacking and tiling can’t be rushed no matter how many workers turn up.

Weeks 1-2: Protection, hacking and the wet works that decide everything

Once the permit’s up, the team protects existing finishes (bathroom floor tiles, the main door, the corridor) and starts hacking where needed. Then comes the stage that quietly makes or breaks the flat: wet works.

This is masonry, screeding, waterproofing and tiling. The waterproofing membrane in your bathrooms and kitchen must be laid and left to cure before any tile goes over it, and a proper job includes a ponding test: the floor traps are sealed and the area flooded for 24 to 48 hours to check nothing seeps to the unit below. You cannot speed this up. The cure time is chemistry, not labour.

Weeks 2-4: First-fix services, while the walls are still open

With wet areas curing, the team moves to plumbing, electrical and aircon first-fix. Get every power point, data outlet and switch right now, while the walls are open. Once they’re plastered and painted, adding a socket means chasing into a finished wall.

HDB electrical work must be done by a Licensed Electrical Worker (LEW), and aircon trunking is concealed now if you’re running a false ceiling. Lock in before this stage closes:

• Power and data points: count the ones you’ll actually use, then add a few extra by the bed, sofa and TV console.
• Aircon sizing and condensate drainage: the drain needs a gentle fall, or you’ll get drips later.
• Switch positions and lighting circuits: decide which lights go on which switch while it’s still cheap to change.
• Distribution board: check it handles your loads, especially with multiple aircon units and an induction hob.

Weeks 3-6: Carpentry, the longest lead time you don’t see

Carpentry is the lead time that hides from you. Wardrobes, kitchen cabinets, the TV feature, the shoe cabinet — most of it is fabricated off-site in a workshop, which takes around three to four weeks. The clock starts only after your final measurements and materials are confirmed.

Dither over laminate colours for two weeks and you’ve added two weeks to your move-in date, even with site works flying. Pick your Lamitak or EDL laminates, your sintered stone or quartz worktop and your handle profiles before the workshop drawing goes out. The on-site install then runs two to four weeks, overlapping the next stage.

Weeks 5-8: Ceiling, painting, install and the finishing run

False ceiling and partitions go up, then two to three coats of paint (Nippon or Dulux are the usual specs). Carpentry is installed and scribed to the walls, sanitary ware and the kitchen sink go in, glass and shower screens are fitted, and the aircon is mounted and trialled. SPC vinyl, if you’ve picked it as an overlay, usually goes down near the end because it lays fast and needs no hacking.

This is also when small mismatches surface: a laminate door that catches, a tile with a hollow ring, silicone gone in messy. We’ve handed over flats where the only thing left to fix was a 2mm gap on a wardrobe door the owner would never have spotted, but they pay us to spot it.

The final week: defects, snagging and your last payment

Before the last payment, walk every room with a checklist. Work the drawers and soft-close hinges, tap tiles for hollowness, check the falls drain, test every socket, switch and the aircon, and read the paint under daylight. A reputable firm expects this and clears the snag list before you settle the balance. A staggered payment schedule, where you never pay the bulk upfront, is what gives you that leverage.

Add it up and a typical full-home BTO renovation lands at 4 to 8 weeks of works, with a 4-room flat commonly in the SGD 45,000 to 62,000 range depending on carpentry volume and material grade. A 5-room usually runs higher.

Questions BTO owners keep asking us

How long does a BTO renovation take in Singapore?

A full-home BTO renovation typically runs 4 to 8 weeks of site works, first day on site to handover. A light scope with little hacking and modest carpentry finishes can land nearer four weeks; heavy carpentry or late decisions push it toward eight.

Can you start renovation before the permit is approved?

No. Noisy and hacking works can only begin once HDB approves the renovation permit your contractor files for you. Starting early risks a stop-work order and penalties. For jobs involving hacking, allow up to three weeks for approval.

BTO renovation timeline: where the lost weeks actually come from

The renovation rarely runs late because of the builders. It runs late because of decisions. Confirm your contractor and permit scope first, then your wet-area design, then your carpentry finishes, in that order, and the four-to-eight weeks holds. The owners who slip are usually still debating laminate swatches in week four.

See how we plan and run full-home jobs in our past projects, browse our renovation services, or reach us through contact. If you’d rather talk it through, message Reno Bros on WhatsApp and we’ll map a schedule around your key date.

Related Reads

• Permit Guide for HDB Hacking, Wet Works and Renovation Approvals
• Maximising HDB BTO Space: Clever Hacks
• The 2026 Guide to Renovation Costs and Budgeting