Renovation Guides · Design Authority Singapore
Detailed cost breakdown for renovating a 4-room HDB flat in Singapore in 2026. Covers BTO vs resale pricing, room-by-room costs, budget tiers, timeline, and what drives costs up.
The single biggest cost driver in a 4-room HDB renovation isn’t your choice of kitchen countertop or wardrobe laminate. It’s whether you’re starting fresh in a BTO or taking on a resale unit with decades of existing infrastructure.
| 4-Room BTO ($40K–$62K) | 4-Room Resale ($55K–$100K+) | |
|---|---|---|
| Electrical | New wiring, minimal work | Often needs full rewire: $5K–$10K |
| Hacking | Rarely needed | Tile hacking alone: $3K–$5.5K |
| Waterproofing | HDB warranty covers 3 yrs | May need replacement: $3K–$8K |
| Plumbing | New pipes, minimal | Old pipes, replacement common |
| Timeline | 8–10 weeks | 10–14 weeks |
Functional kitchen with laminate cabinets, both bathrooms retiled with standard fixtures, vinyl flooring, built-in wardrobes in standard designs, basic TV console and shoe cabinet, full repaint. No feature walls or extended carpentry.
Kitchen with quartz countertop, semi-custom layout; bathroom upgrades with quality fixtures; engineered wood or quality vinyl flooring; full-height wardrobes; TV feature wall with built-in shelving; concealed lighting elements.
Custom kitchen with stone worktops, premium hardware; spa-quality bathrooms with rain shower; full-flat porcelain or marble-look tiles; extensive custom carpentry; platform beds; smart home pre-wiring; detailed ceiling works.
| Item | Budget | Mid-Range | Premium |
|---|---|---|---|
| Kitchen cabinets | $4,000–$6,000 | $6,500–$9,000 | $9,000–$14,000 |
| Countertop | $400–$800 | $1,500–$3,500 | $3,500–$7,000+ |
| Kitchen tiling | $1,200–$2,200 | $2,000–$3,500 | $3,000–$5,000 |
| Item (per bathroom) | Cost Range |
|---|---|
| Hacking and disposal (resale) | $800 – $1,500 |
| Waterproofing | $500 – $1,000 |
| Floor + wall tiling | $1,500 – $3,500 |
| Toilet bowl, basin, tap | $800 – $2,500 |
| Shower screen | $400 – $1,200 |
| Per Bathroom Total | $4,000 – $9,000 |
| Carpentry Item | Budget Range |
|---|---|
| Bedroom wardrobe (per room, standard) | $1,500 – $4,500 |
| Full-height wardrobe with mirrored sliding doors | $3,000 – $6,000 |
| TV console with feature wall | $2,000 – $6,000 |
| Shoe cabinet (entryway) | $800 – $2,500 |
| Platform bed (one bedroom) | $2,500 – $5,000 |
| Material | Approx. Cost/sqft | Whole-flat (90sqm) |
|---|---|---|
| Vinyl / LVT planks | $3 – $6 | $2,900 – $5,800 |
| Laminate | $4 – $8 | $3,900 – $7,800 |
| Engineered wood | $8 – $15 | $7,800 – $14,600 |
For BTO flats: $2,500–$4,000 (additional power points and lighting). For resale: full rewire $5,000–$10,000. Additional power points: $70–$100 each. Always rewire at the start of the renovation before walls are sealed.
| Category | Share of Budget |
|---|---|
| Carpentry | 30–40% |
| Wet works (kitchen + bathrooms) | 15–22% |
| Flooring | 10–15% |
| Electrical | 8–12% |
| Hacking + disposal (resale) | 8–12% |
| Painting | 5–8% |
| Plumbing | 5–10% |
| Contingency (recommended) | 10% |
| Category | 4-Room BTO | 4-Room Resale (Moderate) | 4-Room Resale (Full Scope) |
|---|---|---|---|
| Kitchen | $10,800–$15,000 | $13,000–$18,000 | $16,000–$22,000+ |
| Bathrooms (x2) | $7,000–$11,000 | $9,000–$14,000 | $13,000–$18,000 |
| Carpentry (whole flat) | $12,000–$18,000 | $14,000–$22,000 | $20,000–$30,000 |
| Flooring | $3,500–$7,000 | $4,500–$8,000 | $7,000–$14,000 |
| Electrical | $2,500–$4,000 | $5,000–$7,500 | $7,000–$10,000 |
| Hacking + disposal | — | $3,000–$5,500 | $5,000–$7,500 |
| Painting | $2,000–$3,000 | $2,200–$3,500 | $3,000–$4,500 |
| Plumbing | $1,000–$2,000 | $2,500–$5,000 | $4,000–$8,000 |
| Estimated Total | $40,000–$62,000 | $55,000–$75,000 | $75,000–$100,000+ |
| Phase | Duration | What Happens |
|---|---|---|
| Before Keys | — | Planning, quotes, design — collect 3 itemised quotes |
| Weeks 1–2 | — | HDB permit application via APEX (3–5 days approval); material sign-off |
| Weeks 2–5 | — | Hacking, demolition, wet works, waterproofing, electrical first-fix |
| Weeks 4–8 | — | Carpentry fabrication and installation, flooring, electrical/plumbing completion |
| Weeks 8–10 (BTO) / 10–14 (Resale) | — | Painting, fixtures, touch-ups, handover walkthrough |
| Factor | Interior Designer | Direct Contractor |
|---|---|---|
| Cost premium | 15–30% above contractor | Base rates; 3D renders $300–$500/room |
| Design concept | Full concept, mood boards, 3D | Basic layouts; limited concept |
| Project management | Single point of contact | You manage coordination |
| Best for | Resale flats; first-time renovators | BTO; clear design brief; experienced |
| Bank | Flat Rate (from) | EIR (from) | Max Loan |
|---|---|---|---|
| DBS / POSB | 3.38% p.a. | ~6.40% p.a. | $30,000 |
| OCBC | ~2.88% p.a. | ~4.91–5.41% p.a. | $30,000 |
| Maybank | 2.50% p.a. (promo) | Varies | $30,000 |
| Market low (early 2026) | 1.60% p.a. | ~3.07% p.a. | $30,000 |
Renovation loans cover permanent works only (carpentry, tiling, flooring, electrical, plumbing, painting). The $30,000 cap applies at all major banks. Funds go directly to your contractor — not to your bank account. CPF cannot be used to repay renovation loans.
For resale renovations above $30,000, consider combining a renovation loan with a personal loan top-up. Personal loans have no usage restrictions but carry higher effective rates (from ~1.93% EIR at the competitive end in 2026).
A 4-room BTO renovation costs $40,000–$62,000. A resale renovation costs $55,000–$85,000, with full-scope transformations reaching $100,000 or more.
Yes, for a BTO unit. A focused renovation covering kitchen, bathrooms, flooring, essential carpentry and painting can come in at $40,000–$50,000 with disciplined material choices. For resale flats, $50,000 is possible only if existing electrical and plumbing are in good condition.
Yes, for works including hacking of walls or floors, plumbing changes, electrical rewiring, and window replacement. Your contractor must be registered in HDB’s Directory of Renovation Contractors (DRC). Permits are submitted through HDB’s APEX system and typically approved within 3–5 working days.
A BTO 4-room renovation typically takes 8–10 weeks. A resale 4-room renovation takes 10–14 weeks due to additional hacking, demolition, and infrastructure work.
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