Planning a home renovation?
Whether you’re looking at a new BTO or resale flat, understanding HDB flat sizes, typical renovation cost ranges, and how to budget wisely will help you avoid unexpected cost overruns.
Why HDB Room Sizes Matter
In Singapore, more than 80% of resident households live in public housing managed by the Housing & Development Board (HDB). Understanding the common HDB flat types such as 3-room, 4-room, and 5-room flats helps homeowners plan layouts, storage, renovations, and budgets more accurately.
The way an interior designer approaches a compact 3-room flat differs significantly from a larger 5-room or jumbo flat. Beyond the amount of available space, layout shapes and configurations also influence renovation planning.
Here are the typical internal floor areas and key layout details:
| Flat Type | Approximate Area | Bedrooms | Bathrooms & Key Spaces |
|---|---|---|---|
| 3-Room | 60–65 m² | 2 (Master + 1 Common) | Living and dining area, compact kitchen, 1 bathroom, shelter or storeroom |
| 4-Room (BTO) | ~90 m² | 3 (Master + 2 Common) | Living and dining area, kitchen with service yard, 2 bathrooms, shelter or storage area |
| 5-Room or Larger | 110–130 m² | 3 Bedrooms | Larger living and dining areas, possible balcony, larger service yard, 2–3 bathrooms and additional storage |
Understanding these differences allows homeowners to better plan built-in carpentry, flooring, storage solutions, and overall layouts, all of which play a significant role in renovation planning.
But how much does renovation actually cost?
What Do Renovations Typically Cost?
Renovation costs in Singapore depend heavily on flat size, renovation scope, and the quality of materials and finishes selected.
As a general guide, here are the typical renovation budgets for move-in-ready homes:
| Flat Type | Average Renovation Budget |
|---|---|
| 3-Room | S$25,000 – S$45,000 |
| 4-Room | S$35,000 – S$65,000 |
| 5-Room or Larger | S$40,000 – S$80,000+ |
Common Renovation Cost Contributors
- Carpentry (kitchen cabinets, wardrobes, storage systems and built-ins): approximately 40–50% of the renovation budget
- Masonry and tiling works including flooring, bathrooms and hacking works
- Electrical rewiring, plumbing and lighting installations
- Painting, fixtures, furnishings and finishing works
A useful guideline is to set aside around 10% of your property’s value for a comprehensive renovation.
For example, if your flat is valued at S$400,000, a renovation budget of approximately S$40,000 provides a reasonable allowance for major works such as flooring, carpentry, and bathroom upgrades without significantly compromising quality.
While this is not a fixed rule, it provides a practical benchmark and helps homeowners avoid underbudgeting in today’s inflationary environment.
What Affects Renovation Costs and How to Manage Them
Key Cost Factors and Budget Management Tips
| Factor | Effect on Cost | How to Optimise |
|---|---|---|
| Flat size and layout complexity | Larger flats and complex layouts require more materials and labour | Adopt a minimalist approach and reduce unnecessary built-ins |
| Carpentry quality and customisation | Premium custom carpentry increases costs | Use standard-sized cabinetry and avoid excessive customisation |
| Finishing materials | Premium tiles, flooring and cabinetry increase costs | Select durable mid-range materials that balance cost and longevity |
| Scope of work | Full renovations cost significantly more than overlays | Prioritise essential works and postpone non-essential upgrades |
| Age and condition of the flat | Older resale flats may require rewiring, plumbing replacement and repairs | Identify major maintenance issues early and complete them together |
Strategically aligning your renovation scope with your lifestyle needs, investing in quality where it matters most, and reviewing multiple quotations can help you maximise value while staying within budget.
How to Get a Responsible Renovation Quote and Avoid Overspending
When speaking with contractors or interior designers, follow these steps to obtain accurate and realistic quotations:
- Provide your flat type, floor area, and floor plan.
- Clearly outline your renovation requirements, whether it is a full renovation, overlay, or selected areas only.
- Request itemised quotations covering carpentry, tiling, plumbing, electrical works, painting, materials, and labour.
- Confirm permit requirements and regulatory compliance for hacking or structural works.
- Compare at least two to three quotations before making a decision.
- Set aside an additional 10–15% contingency budget for unforeseen expenses or upgrades.
Understanding HDB flat sizes, renovation costs, and proper budgeting strategies can help homeowners make informed decisions and avoid overspending while still achieving a functional and attractive living space.
If you are planning a renovation and would like a quotation, speak with our team today.
