Quick Answer
A 4-room resale renovation typically costs S$59,000 to S$85,500, about S$72,500 at the midpoint, before furniture. A 4-room new BTO flat averages S$41,500 to S$61,000. These are averages of 2026 published guides, not quotes. An interior designer may add a mark-up, and CPF suggests at least 10% extra for surprises.
The Useful Number: In the example, a 4-room resale renovation typically costs S$59,000 to S$85,500, or about S$72,500 at the midpoint, before furniture.
Why Do Renovation Quotes Vary So Much?
Published cost guides for the same flat can differ by tens of thousands of dollars. Scope and finishes explain most of it: a light refresh costs far less than new carpentry, flooring, kitchen and bathrooms. A resale flat also needs hacking, rewiring and plumbing that a bare new flat does not.
We read several 2026 guides from Qanvast, ShopBack and SmartCalculator.sg and average their ranges for each home type. These are market ranges, not quotes. Your contractor’s itemised quote decides the real cost.
What Does A 4-Room Resale Renovation Cost?
For a 4-room resale flat the average range is S$59,000 to S$85,500, with a midpoint of S$72,250. A 4-room new BTO flat averages S$41,500 to S$61,000, a midpoint of S$51,250. So resale adds about S$21,000 at the midpoint for hacking, rewiring and plumbing.
Hiring an interior designer adds a fee or mark-up. We use 10% as an editable placeholder because no published figure exists. On the example it adds about S$7,225. CPF suggests keeping at least 10% extra for surprises, which is S$7,225 here.
- 4-Room BTO Midpoint: S$51,250
- Resale Extra Works: S$21,000
- 4-Room Resale Midpoint: S$72,250
Data as of . Source: Qanvast — expected renovation costs for HDB flats in 2026.
Should You Pay Cash Or Take A Renovation Loan?
Banks often cap a renovation loan at the lower of six times your monthly income or S$30,000, over one to five years at roughly 4% to 6% a year. That is bank practice, not an MAS rule, and banks quote flat rates that are about double the effective rate. Borrowing S$30,000 over five years at 5% costs S$566 a month and about S$3,970 in interest, so you would still need about S$42,250 in cash for the example.
Pay in stages as work is finished. A deposit of 10% on signing, 80% in progress payments and 10% after handover is a common pattern. Be wary of any deposit above half the cost.
What Should You Do Next?
Get at least three itemised quotes and compare them with the range. Then put the figure into the cash plan guide so the renovation sits next to your other payments, or pace it with a wedding in the Wedding + Reno + BTO guide.
Quick Check
Three statements from this guide. Tap True or False to check what you have read. Nothing is saved.
Card 1 Of 3
Resale renovations usually cost more than new BTO ones.
Why? Card 1 Of 3
At the 4-room midpoint the difference is about S$21,000.
Card 2 Of 3
A renovation loan cap of six times your monthly income or S$30,000 is an MAS rule.
Why? Card 2 Of 3
Check your own bank’s cap, rate and tenure before you plan around a loan.
Card 3 Of 3
It is safest to pay most of the renovation upfront as a deposit.
Why? Card 3 Of 3
A common pattern is about 10% on signing, 80% in stages and 10% after handover. Be wary of a deposit above half the cost.
Your Score
Estimate Your Own Renovation
Pick your home, scope and who manages the work. See a cost range, a payment schedule and the cost of a loan.
Renovation Cost Calculator →Frequently Asked Questions
Why Does A Resale Renovation Cost More Than A BTO?
A resale flat often needs hacking, rewiring and plumbing that a bare new flat does not.
At the 4-room midpoint the difference is about S$21,000.
How Much Can I Borrow For A Renovation?
Banks often cap a renovation loan at the lower of six times your monthly income or S$30,000, over one to five years.
That is bank practice, not an MAS rule, so check your bank.
How Much Should I Pay Upfront?
As little as possible.
A common pattern is about 10% on signing, 80% in stages as work is finished and 10% after handover. Avoid any deposit above half the cost.
Save Guides Free
Keep This Guide For Your Next Money Decision
Build your own reading list and pick up where you left off with a free WealthMastery account.
Free account · Tools stay free without an account.
Sources & Assumptions
- Qanvast — Expected Renovation Costs For HDB Flats In 2026 ↗
- ShopBack — HDB Renovation Cost ↗
- SmartCalculator.sg — HDB Renovation Cost Singapore 2026 ↗
- SmartCalculator.sg — Renovation Cost Singapore 2026 ↗
- CPF Board — Guide For First-Time Resale Flat Buyers ↗
Sources checked 28 October 2026. These are examples only. Check the stated assumptions and limits before you use a result.
Example only. Typical market ranges read on 28 October 2026, not quotes. The designer mark-up, scope factors and loan terms are editable assumptions, and furniture and moving are not included.