What a BTO renovation typically covers
A newly collected BTO flat comes with fresh electrical wiring, plumbing, and structural finishes — none of which need to be touched. That means a BTO renovation budget goes almost entirely toward the things you can see and choose:
- Carpentry — kitchen cabinets, built-in wardrobes, TV console
- Lighting — downlights, pendant fixtures, false ceiling if wanted
- Flooring overlay, if you're not happy with the standard finish
- Painting
HDB BTO renovations typically cost $25,000–$40,000, and crucially, no hacking is needed — the existing floor and wall finishes can mostly be built on top of rather than removed.
What changes with a resale flat
A resale flat, particularly one that's 15–25 years old, often needs work done before any of the visible renovation can start:
- Hacking and re-tiling — older tiles often need to be removed before new flooring or wall tiles go down, which is a different (and pricier) process than overlaying.
- Electrical rewiring — wiring installed decades ago may not meet current load requirements or safety standards, especially if you're adding air-con units, kitchen appliances, or extra power points.
- Plumbing and waterproofing — pipes degrade over time, and bathroom waterproofing membranes have a limited lifespan. If they've failed, water seepage to the unit below becomes a real risk.
These three categories alone can add $10,000–$30,000 to a resale renovation before a single cabinet or tile is chosen — which is the entire reason HDB resale renovations land at $35,000–$60,000 for a 4-room flat, noticeably higher than a comparable BTO.
A simple way to think about it
| BTO | Resale (15–25 years old) | |
|---|---|---|
| Hacking needed | Usually none | Often yes |
| Electrical rewiring | Not needed | Often needed |
| Plumbing/waterproofing | Not needed | Often needed |
| Typical 4-room budget | $25,000–$40,000 | $35,000–$60,000+ |
If you're house-hunting and renovation budget is a factor, this is worth weighing alongside the purchase price — a cheaper resale flat that needs a full rewire and re-piping might end up costing more all-in than a slightly pricier unit in better condition.
How to check before you buy (or before you renovate)
If you already own a resale flat and aren't sure what state it's in:
- Ask your contractor to do a walkthrough early and flag any visible signs of water damage, especially around bathrooms and kitchen walls — this often points to waterproofing issues.
- Check the age of the wiring — flats from the 1980s–90s commonly used wiring that's now considered undersized for modern appliance loads.
- Get a straight answer on whether hacking is included in a quote, and for which areas — "renovation package" quotes sometimes assume overlay work unless you specify otherwise.