Answer
HDB Resale Flat Renovation Budget — $30K–$80K by Scope
Resale flat renovation isn't optional — it's your biggest cost after the flat itself. Older flats cost $10K–$20K more than newer ones. Here's exactly where the money goes.
Answer: HDB resale renovation runs $30K–$80K depending on scope. Basic refresh: $8K–$15K. Moderate (kitchen + bathrooms + flooring + carpentry): $35K–$55K. Full overhaul: $55K–$80K. Flats older than 20 years add $10K–$20K for rewiring ($3.5K–$6K), replastering ($2K–$4K), and plumbing replacement ($2K–$5K). Must use HDB-licensed contractors from the DRC list. Timeline: 6–10 weeks moderate, 10–14 weeks full overhaul. Budget 15–20% contingency.
Renovation Cost by Scope (4-Room HDB Resale)
2026 market rates, excluding furniture and appliances
| Scope | Cost Range | What's Included |
|---|---|---|
| Basic refresh | $8K–$15K | Paint, lighting, minor fixes |
| Moderate | $35K–$55K | Kitchen + bathrooms + flooring + carpentry |
| Full overhaul | $55K–$80K | Hack everything, new layout, all trades |
| Premium | $80K–$120K+ | High-end finishes, designer carpentry |
Older Flat Premium (Pre-2000 Builds)
Additional costs you can't avoid on flats older than 20–25 years
| Item | Cost | Why It's Needed |
|---|---|---|
| Electrical rewiring | $3,500–$6,000 | Aluminium wiring, insufficient circuits |
| Replastering | $2,000–$4,000 | Flaking, cracking plaster |
| Plumbing replacement | $2,000–$5,000 | Corroded cast iron/galvanised pipes |
| Waterproofing | $1,500–$3,000/bath | Degraded membrane, leak liability |
Total older flat premium: $10K–$20K on top of standard renovation costs.
Factor renovation into your total upgrade cost
Your renovation budget directly impacts your cash position after buying. Calculate your full picture.
FAQ
How much does HDB resale flat renovation cost in 2026?
Typical range is $30K-$80K depending on scope. Here's the breakdown by scope level: Basic refresh (paint, lighting, minor fixes): $8K-$15K. Moderate reno (kitchen + bathrooms + flooring + painting): $30K-$45K. Full overhaul (hack everything, new layout, custom carpentry, all new electrical and plumbing): $55K-$80K. Premium with high-end finishes (marble, solid wood, designer carpentry): $80K-$120K+. Most 4-room HDB resale buyers land in the $35K-$55K range — new flooring, redo both bathrooms, refresh the kitchen, full repaint, and some built-in carpentry (wardrobes, shoe cabinet, TV console). The biggest cost drivers are (1) hacking and re-tiling bathrooms at $5K-$8K each, (2) custom carpentry at $8K-$25K depending on extent, and (3) kitchen overhaul at $8K-$15K including new cabinets and countertop.
Why do older HDB resale flats cost more to renovate?
Flats older than 20-25 years almost always need electrical rewiring and replastering — two costs that newer flats avoid entirely. Electrical rewiring: $3,500-$6,000 for a 4-room flat. Older flats use aluminium wiring (fire risk) or have insufficient circuit capacity for modern appliances (aircon in every room, induction hob, washer-dryer). SP Group may flag this during inspection. Replastering walls and ceilings: $2,000-$4,000. Old plaster flakes, cracks, and has uneven surfaces that paint alone can't fix. You'll need to hack off old plaster, skim coat, and re-plaster before painting. Plumbing replacement: $2,000-$5,000. Cast iron or galvanised pipes in 1980s-1990s flats corrode internally — you'll get rusty water and reduced flow. Replace with PVC/copper. Waterproofing redo: $1,500-$3,000 per bathroom. Old waterproofing membrane degrades, causing leaks to the unit below (you're liable). Total 'old flat premium': $10K-$20K on top of your renovation budget. A 1985 flat that would cost $40K to renovate if it were a 2010 flat will cost $50K-$60K instead. Factor this into your purchase decision — a $20K cheaper older flat might actually cost the same after renovation.
What are the must-do vs nice-to-have renovation items?
Must-do (safety and function — don't skip these): (1) Electrical rewiring if flat is pre-2000: $3,500-$6,000. Not optional — aluminium wiring is a fire hazard and insurers may reject claims. (2) Waterproofing bathrooms: $1,500-$3,000/bathroom. If the existing waterproofing is compromised, you're liable for water damage to the unit below. (3) Plumbing check and replacement if corroded: $2,000-$5,000. Rusty pipes contaminate your water. (4) Window grille installation if high floor with kids: $800-$2,000. BCA requirement for units above 1st storey with young children. (5) Painting: $1,500-$3,000. Bare minimum to make the flat liveable. Nice-to-have (comfort and aesthetics): (1) Overlay flooring (vinyl over existing tiles): $3,000-$5,000. Cheaper than hacking. (2) Hack and re-tile flooring: $6,000-$10,000. Looks better but 3x the cost of overlay. (3) Custom carpentry (wardrobes, kitchen cabinets, TV console, shoe cabinet): $8,000-$25,000. The single biggest discretionary cost. (4) False ceiling with cove lighting: $2,000-$5,000. Aesthetic only. (5) Feature wall: $500-$2,000. The must-do items total $10K-$18K for an older flat. Everything else is discretionary.
Do I need to use HDB-licensed contractors?
Yes — for any renovation work that involves hacking, electrical, plumbing, or structural changes, you MUST use an HDB-registered renovation contractor. HDB maintains a Directory of Renovation Contractors (DRC) with about 800+ listed firms. The contractor must apply for an HDB renovation permit on your behalf before any work begins. Permit processing takes 1-3 working days. Key HDB renovation rules: (1) No hacking of structural walls, beams, or columns — ever. (2) No hacking of bathroom/kitchen floor slabs (waterproofing sits on top). (3) Renovation hours: weekdays 9am-6pm, Saturdays 9am-1pm. No work on Sundays and public holidays. (4) Maximum renovation period: 3 months from permit date for most work. (5) A $5,000 renovation deposit is held by HDB (refunded after satisfactory completion). Penalty for using unlicensed contractors: HDB can compel you to reinstate the flat to original condition at your own cost — potentially $20K-$50K. Plus your renovation insurance won't cover unlicensed work. Always verify your contractor is on the DRC list before signing anything.
How long does HDB resale renovation take?
Typical timeline: 6-10 weeks for a moderate renovation, 10-14 weeks for a full overhaul. Here's the breakdown: Week 1-2: Hacking and demolition (existing tiles, walls, built-ins). Week 2-3: Electrical rewiring and plumbing rough-in. Week 3-4: Masonry — new walls, plastering, waterproofing. Week 4-5: Tiling (floors and bathrooms). Week 5-7: Carpentry installation (wardrobes, kitchen cabinets, vanities). Week 7-8: Painting (2-3 coats, needs dry time). Week 8-9: Electrical fixtures, plumbing fixtures, glass. Week 9-10: Final touch-up, cleaning, defect check. Critical path items that delay everything: (1) Custom carpentry — if your carpenter is backlogged, your entire timeline shifts. Book 2-3 months ahead. (2) Tiles and materials — imported tiles take 4-6 weeks to arrive. Choose early. (3) Hacking next to neighbours — if complaints come in, HDB may pause your permit. Pro tip: get your renovation contractor locked in and permit applied the moment you get your HDB resale completion appointment. Most people lose 2-4 weeks waiting because they only start looking for contractors after key collection.
How should I budget and pay for HDB resale renovation?
Rule of thumb: set aside 10-15% of your flat purchase price for renovation. Buying a $550K 4-room resale? Budget $55K-$82K for renovation. Payment structure with most contractors: 10% deposit on signing the contract. 30% when hacking and demolition is complete. 30% when tiling and carpentry are done. 25% on completion and handover. 5% retention (held for 1-3 months for defect rectification). Financing options: (1) Cash savings — ideal, no interest. (2) HDB renovation loan — up to $50K over 5 years, but only available if you took an HDB housing loan (not bank loan). Interest rate tied to CPF OA rate at 2.6%. (3) Bank renovation loan — $30K-$100K over 1-5 years, interest rates 3.5-6% in 2026. DBS, OCBC, UOB all offer these. (4) Credit line — don't. 20%+ interest will destroy you. Budget buffer: always add 15-20% contingency on top of quoted price. Hidden costs appear once walls are opened — corroded pipes, termite damage, asbestos ceiling tiles in very old flats. A $45K quote often becomes $50K-$55K in reality. Get at least 3 quotes, and be wary of any quote that's 30%+ below the others — they'll either cut corners or hit you with variation orders mid-reno.
Related
- Condo Renovation Cost — $30K–$80K typical
- Renovation Budget HDB & Condo — 4-room HDB $40K–$65K
- HDB Renovation Guidelines 2026 — permit required, no hacking wet areas
- HDB Resale Flat Inspection — $200–$400 inspector, check before buying
- Total Cost of Buying a Condo — $128K–$244K cash for $1M–$2M
Last updated Feb 2026. Renovation costs based on 2025–2026 market rates from HDB-registered contractors. Older flat premium applies to flats built before 2000. All figures are estimates — actual costs vary by flat condition, contractor, and material choices. HDB renovation rules per HDB renovation guidelines. This is general information, not professional advice.