Planning to renovate your HDB flat in Singapore? Get accurate 2025 renovation costs for 3-room, 4-room, and 5-room flats (BTO and resale), HDB permit rules, DRC contractor requirements, and renovation loan limits.
Renovating an HDB flat in Singapore involves more than just picking tiles and cabinets. You need to navigate HDB permits, use DRC-registered contractors, and budget for costs that many homeowners miss. This guide breaks down everything for 2025.
HDB Renovation Cost by Flat Type (2025)
BTO (New) Flats
| Flat Type | Cost Range (SGD) |
|---|---|
| 3-Room BTO | S$25,000 – S$45,000 |
| 4-Room BTO | S$43,000 – S$66,000 |
| 5-Room BTO | S$62,000 – S$85,000 |
Resale Flats (add 20–40% over BTO)
| Flat Type | Cost Range (SGD) |
|---|---|
| 3-Room Resale | S$35,000 – S$55,000 |
| 4-Room Resale | S$50,000 – S$80,000 |
| 5-Room Resale | S$70,000 – S$100,000 |
| Maisonette | S$80,000+ |
Resale flats cost more because they typically need full hacking, waterproofing overhaul, and electrical/plumbing upgrades — work that BTO owners skip.
Renovation Cost by Room
| Room | Cost Range (SGD) |
|---|---|
| Kitchen | S$6,000 – S$15,000 |
| Bathroom (per unit) | S$4,000 – S$8,000 |
| Living Room | S$5,000 – S$15,000 |
| Master Bedroom | S$3,000 – S$8,000 |
| Common Bedroom | S$600 – S$5,000 |
| Balcony | S$3,000 – S$10,000 |
Hidden Costs Most Homeowners Miss
| Item | Cost (SGD) |
|---|---|
| Electrical rewiring (full flat) | S$4,000 – S$6,000 |
| Extra power points (concealed) | S$95 – S$130 each |
| Air-con (supply & install, 1 unit) | S$700 – S$1,500 |
| Plumbing updates | S$1,500 – S$4,000 |
| Door frame removal | S$600 – S$900 per frame |
| PE assessment (if required) | S$800 – S$2,000 |
| Debris removal & cleaning | S$400+ |
💡 Always add 10–15% buffer to your total budget for hidden costs. Resale flats almost always need electrical and plumbing upgrades discovered only after hacking begins.
HDB Rules: What You Can and Cannot Do
Strictly Prohibited (No Exceptions)
- Hacking load-bearing walls, structural beams, or columns
- Exceeding 150 kg/sqm floor loading
- Modifying external facades or window grilles (unauthorised types)
- Creating openings in party walls
- Hacking toilet tiles in BTO flats within 3 years of completion
Requires HDB Permit (Submit Before Starting)
- Hacking any non-structural walls
- New plumbing installations
- Electrical rewiring beyond existing points
- Window replacement (must use BCA-approved contractors)
- Floor modifications and raising
No Permit Needed
- Painting walls and ceilings
- Installing furniture and light fixtures
- Overlay flooring (no hacking of existing tiles)
- Minor carpentry works
The DRC Contractor Requirement
This is the #1 rule HDB homeowners must know: you MUST use a contractor from HDB's Directory of Renovation Contractors (DRC). Only DRC-registered contractors can submit renovation permits via HDB's APEX system.
⚠️ Using a non-DRC contractor means: no permit can be obtained, work is technically illegal, fines up to S$5,000, and you may be required to restore all works at your own cost.
HDB Renovation Working Hours
| Work Type | Allowed Hours |
|---|---|
| General renovation | 9am – 6pm, weekdays & Saturdays |
| Noisy work (hacking, drilling) | 9am – 5pm, weekdays ONLY |
| Sundays & Public Holidays | No renovation work allowed |
Renovation Loans in Singapore
- Maximum loan: S$30,000 or 6× monthly income (whichever is lower)
- With co-applicant: up to 12× lower monthly income, still capped at S$30,000
- Minimum income: S$24,000/year
- CPF Ordinary Account CANNOT be used for renovation
- TDSR must not exceed 55% of gross monthly income
Typical Timeline for HDB Renovation
| Flat Type | Estimated Duration |
|---|---|
| BTO renovation | 6–10 weeks from permit approval |
| Resale renovation (full) | 8–12+ weeks |
| Planning to move-in (total) | 3–5 months |
💡 Managing your HDB renovation timeline? RenoSmart auto-generates a Gantt chart from your quotation items, tracks phase progress, and lets your homeowner view updates in real-time. Try free at renosmart.app