Buying a resale HDB flat is one of the biggest financial decisions most Singaporeans will ever make. But the purchase price is rarely the end of the story. Once you collect the keys, the next big questions are: how much will it cost to make the place liveable, and how much should I expect to spend?
Unlike a new BTO flat, where you are working with a blank canvas, a resale flat comes with a history. The previous owners may have done things you want to undo. Tiles, cabinetry, plumbing, and electrical systems will inevitably all be older. That means more groundwork before the actual design work can even begin. The result? Resale flat renovations almost always cost more and take longer than people initially expect.
The Numbers You Can Expect To Pay
Based on 2025 data from Qanvast, an interior design and home renovation database that tracks hundreds of real renovation projects in Singapore, here is what resale flat owners are looking at on average:
- 3-room resale flat: $51,000 to $61,800
- 4-room resale flat: $64,300 to $80,300
- 5-room resale flat: $80,900 to $95,600
Compare that to BTO renovation costs for 2025, which Qanvast puts at $36,100 to $43,700 for a 3-room flat, $51,000 to $61,800 for a 4-room, and $67,000 to $82,400 for a 5-room. The resale premium is a real phenomenon, and it is a significant factor to contend with.
Interestingly, 3-room resale flats tend to cost more per square foot to renovate than larger units. The main reason is that smaller spaces require far more design ingenuity to feel functional. Think of it as a game of interior design “Tetris” as you try to fit your furniture into a limited space. You are essentially paying more for clever storage solutions, space-maximising carpentry, and layout work to make the place feel bigger than it is.
Read Also: Should You Sell Your HDB & Rent While Waiting For A New Condo To TOP Or Buy A Resale Condo?
Why Resale Renovations Cost More
The price difference comes down to one word: demolition. Before you can put in new flooring or a fresh kitchen, you often have to tear out what is already there (assuming it needs to be replaced). Hacking old tiles, removing existing cabinetry, and stripping out ancient fittings all add to the cost and time taken. On top of that, resale flats frequently have underlying infrastructure issues that only surface once renovation work begins.
Common culprits include:
Electrical rewiring – Older wiring systems are often unable to safely support the modern appliances that we’re purchasing in 2026. Full rewiring such as this can typically cost between $2,000 and $5,000 and is not optional in flats with ageing circuits. All electrical work must be carried out by an EMA-licensed electrical worker.
Plumbing – Old iron or galvanised pipes often need replacing with copper or PVC alternatives. Budget $2,500 to $5,000 for a full plumbing overhaul.
Waterproofing – Bathroom waterproofing membranes degrade over time. Failed waterproofing in an older flat can cause leaks into the unit below, which creates much bigger problems down the line.
These are not optional extras. They are baseline requirements for making an older flat safe, compliant, and liveable. And because they are often invisible until work is underway, they are also one of the most common reasons renovation budgets get blown out.
Where The Money Actually Goes
It helps to understand how a renovation budget typically breaks down. According to Qanvast, hacking and masonry work, which covers demolition of old tiles, wall removal, and re-tiling bathrooms and kitchens, usually comes in at $8,000 to $15,000. Electrical works, including full rewiring and distribution board upgrades, run from $4,000 to $8,000. Meanwhile, plumbing sits at around $2,500 to $5,000 for pipe replacements and new fixtures.
Carpentry, however, is almost always the biggest single line item, typically ranging from $12,000 to $25,000. This typically covers kitchen cabinets, bedroom wardrobes, TV consoles, and study desks. Custom built-ins look great but cost significantly more than off-the-shelf alternatives, and this is usually the category with the most room to adjust if you need to bring costs down. Relaminating existing cabinetry instead of replacing it wholesale, or using IKEA fittings for secondary bedrooms, can save a decent chunk without compromising the overall look of the space.
For most families renovating a 4- to 5-room resale flat, the realistic sweet spot in 2025 is somewhere between $65,000 and $85,000 for a result that is both stylish and functional. Budget-conscious homeowners can come in lower by being selective about where they spend, and those going for premium finishes or full-scale transformations may go beyond that range (the sky is the limit).
Read Also: 7 Little-Known HDB Renovation Guidelines That Singaporean Homeowners Should Know About
What HDB Rules Do You Need To Know?
It’s worth noting that HDB has strict rules governing what you can and cannot do to your flat, and that’s especially true for resale units. Given this, it’s worth your time to fully understand what’s permitted before you start planning.
First off, you must use a contractor listed in HDB’s Directory of Renovation Contractors (DRC). Using an unlicensed contractor is not just unnecessary risk from a workmanship standpoint, but it’s just illegal. As a result, HDB can require you to reinstate your flat at your own expense if unauthorised works are carried out.
Second, certain types of renovation work require a permit to be submitted through HDB’s APEX system. This includes hacking of walls, floor modifications, plumbing changes, electrical rewiring, and window replacements. Your contractor applies for this on your behalf, and most standard permits are approved within a few days. Renovation works are only permitted between 9am and 6pm on weekdays and Saturdays. Unsurprisingly, no noisy work is allowed on Sundays and public holidays.
Making It Work Within Your Budget
If paying some of these higher-end prices, such as $61,800 to $95,600, feels out of reach, there are ways to bring costs down without compromising the fundamentals. Prioritise structural and infrastructure work. Electrical, plumbing, and waterproofing are “non-negotiables” for an older flat, since they directly impact your day-to-day life. Then be strategic about carpentry and decide where you can cut costs, as this area accounts for a large share of the renovation budget.
Finally, don’t underestimate the value of getting multiple quotes. The range between contractors for identical scopes of work can be surprisingly wide, and getting three to five quotes gives you a clearer sense of market rates and helps you spot value.
Ultimately, renovating a resale flat is a significant financial commitment on top of an already large property purchase. Factor that into your overall budget if you’re in the process of buying and planning to carry out a “reno”. And remember that the cost of doing the renovation right the first time will always be lower than the cost of having to redo it.
Read Also: Guide To The Cost Of Renovating An HDB Flat In Singapore
