The headline range
A 4-room HDB flat renovation in Singapore typically falls between $35,000 and $65,000. That's a wide range, and the reason it's wide comes down to three tiers of scope:
- Basic ($35,000–$45,000) — flooring overlay or partial re-tiling, a fresh coat of paint, basic lighting replacement, and minor carpentry. Roughly what a new BTO with minimal hacking needs.
- Mid-range ($45,000–$55,000) — adds custom built-in wardrobes, full kitchen cabinet replacement, a full bathroom overhaul, and feature walls.
- Premium ($55,000–$65,000+) — high-end materials, full customisation throughout, designer fittings, and often smart home wiring.
Why BTOs and resale flats land so differently
A new BTO 4-room flat tends to sit at the lower end of this range, often closer to $35,000–$45,000, because the existing finishes, electrical wiring, and plumbing are all new — there's nothing to hack out or replace before the visible work starts.
A resale flat, especially one that's 15–25 years old, is a different story. Older units often need:
- Full electrical rewiring — old wiring may not meet current safety standards
- Plumbing replacement and waterproofing remediation if membranes have degraded
- Hacking of existing tiles and finishes before new ones go in
These "invisible" items alone can add $10,000–$30,000 before you've chosen a single tile or cabinet design — which is why two flats that look similar on paper can end up with very different final bills.
Where the budget actually goes
Across both BTO and resale renovations, carpentry tends to dominate. Built-in wardrobes, kitchen cabinets, TV consoles, and any custom joinery typically account for 25–40% of the total budget — making it the single largest line item by far. The material choice matters enormously here: laminate carpentry might run $120–180 per linear foot, while solid wood or aluminium finishes can be 2–3 times that.
Other categories, roughly in order of typical spend:
| Category | Typical rate |
|---|---|
| Carpentry (cabinets, wardrobes) | $120–$450 per linear ft |
| Flooring | $4–$45 per sqft |
| Bathroom works (per bathroom) | $1,500–$12,000 |
| Kitchen overhaul | $3,000–$25,000 |
| Electrical rewiring | $1.50–$7 per sqft |
| Painting | $2–$8 per sqft |
| False ceiling | $8–$28 per sqft |
| Hacking & masonry | $5–$18 per sqft |
A few hidden costs to budget for separately
Quotes from contractors don't always include everything. Keep a buffer for:
- Hacking and debris disposal fees ($2,000–$5,000)
- Electrical rewiring for older flats ($1,500–$4,000) if not already in the quote
- Waterproofing remediation for bathrooms ($800–$2,000 per bathroom)
- Structural assessment fees if you're removing any walls ($500–$1,500)
- MCST or town council deposits for renovation works
Timeline
Most 4-room HDB renovations take 8–12 weeks. A BTO with minimal hacking can be closer to 8 weeks, while a resale flat with full hacking, rewiring, and wet works tends toward 12–14 weeks. If this is your primary residence, factor in temporary accommodation for at least part of that period.