How Much to Renovate a 4-Room HDB? Cost Guide
The typical 4 room HDB renovation cost in Singapore sits between roughly SGD 35,000 and SGD 75,000 (indicative), depending on whether you are doing a light refresh or a full overhaul. A new BTO usually lands near the lower-to-middle of that band, while a resale flat that needs hacking, rewiring and new flooring pushes towards the upper end. Below we break the figure down by scope and component so you can see exactly where the money goes.
What is the average 4-room HDB renovation cost?
A 4-room flat is around 90 square metres, so it is the most common HDB size and the one most renovation quotes are benchmarked against. As a working guide for 2026, expect these indicative ranges depending on how much you change.
| Scope | What it covers | Indicative cost (SGD) |
|---|---|---|
| Light refresh | Painting, partial carpentry, minor electrical, light fittings | 20,000 – 35,000 |
| Mid-range reno | Full carpentry, kitchen and one toilet, flooring, basic false ceiling | 40,000 – 60,000 |
| Full overhaul | Hacking, two toilets, full rewiring, premium finishes, built-ins throughout | 60,000 – 90,000+ |
These are indicative figures only. Your final quote depends on material grade, the number of carpentry runs, and the condition of the flat when you collect keys.
Cost breakdown by component
It helps to see where each dollar goes. The table below shows a typical mid-range split for a 4-room flat. Carpentry is almost always the single largest line item.
| Component | Indicative cost (SGD) |
|---|---|
| Carpentry (wardrobes, kitchen cabinets, TV feature, storage) | 15,000 – 28,000 |
| Flooring (vinyl, tiles or overlay) | 4,000 – 12,000 |
| Masonry and hacking | 3,000 – 9,000 |
| Electrical and lighting | 3,000 – 7,000 |
| Plumbing and sanitary ware | 2,500 – 6,000 |
| Painting | 2,000 – 4,000 |
| False ceiling and partitions | 2,500 – 6,000 |
| Toilets (two, full reno) | 8,000 – 16,000 |
What makes a 4-room reno cost more?
- Resale versus BTO. Resale flats often need hacking of old tiles, fresh wiring and pipe replacement, which a new BTO does not.
- Carpentry volume. Floor-to-ceiling wardrobes, full-height kitchen cabinetry and built-in storage add up quickly.
- Material grade. Sintered stone countertops, spray-paint finishes and solid timber cost more than laminate equivalents.
- Wet works. Two full toilet renovations, kitchen waterproofing and feature walls raise both labour and tiling costs.
- Designer versus contractor. A design-led firm charges for space planning and project management, which buys you a coherent outcome.
How to budget your 4-room renovation
- Set a total figure and ring-fence a 10 to 15 per cent contingency for surprises behind walls.
- Decide your non-negotiables (kitchen, master wardrobe) before discretionary feature work.
- Get itemised quotes so you can compare like for like, not just bottom-line numbers.
- Phase the work if needed; some homeowners delay a second toilet or study built-ins.
- Confirm what is included, such as haulage, protection works and HDB permits.
For a sense of how rooms come together, our full-home design service handles space planning and carpentry as one package, and our HDB portfolio shows completed 4-room flats. If you are comparing flat types, see our guides on 5-room HDB renovation cost and resale flat renovation cost.
Where to spend and where to save
Not every line item deserves the same investment. A 4-room flat lives better when money goes to the things you touch daily and the works you cannot easily redo later. The guidance below reflects how we advise homeowners on a typical budget.
| Spend on | Why |
|---|---|
| Kitchen worktop and cabinet hardware | Used constantly; cheap hinges and runners fail first |
| Master wardrobe interior fittings | Good organisation makes a compact room work for years |
| Electrical and waterproofing | Hidden works that are disruptive and costly to redo |
| Layered, dimmable lighting | Shapes how the whole flat feels for a modest sum |
Sensible places to economise include spray paint on less-visible cabinetry, where laminate performs just as well, feature walls limited to one focal point rather than several, and overlay flooring instead of full tile hacking where the existing screed is sound. Trimming here rarely shows, while it frees budget for the items above.
Common hidden costs in a 4-room renovation
The figures that push a budget over usually are not the obvious carpentry lines. They are the works that only reveal themselves once the flat is opened up. Plan for these so they do not derail your project.
- Levelling old or uneven screed before new flooring can be laid, more common in resale flats.
- Upgrading the electrical distribution box to support modern appliances and aircon loads.
- Re-waterproofing wet areas if the existing membrane has aged or shows signs of failure.
- Haulage and disposal of debris and old built-ins, which is sometimes quoted separately.
- Protection works for lifts, corridors and existing finishes during the build.
- Variation orders if you change your mind on layout or finishes after works begin.
Listing these against your quote upfront keeps surprises to a minimum, and it is one reason an itemised quotation is worth insisting on.
How payment is usually staged
Most renovations in Singapore are paid in instalments tied to progress rather than as a single sum. A typical structure takes a deposit on confirmation, followed by payments at the start of works, on completion of carpentry and major works, and a final sum at handover after defect checks. This protects you because each payment follows delivered work rather than a promise. Agree the schedule in writing before you sign, and confirm what milestone each payment is tied to. For more on vetting a firm and its contract, see our guide on how to choose a renovation contractor.
Does a designer or contractor cost more for a 4-room flat?
The honest answer is that a design-led firm usually costs more upfront than a contractor working to your own drawings, because the fee covers space planning, material sourcing, drawings and site coordination, not just the building work. For a 4-room flat, that difference is often offset by fewer costly changes mid-project, a layout that is right the first time, and a single point of accountability if something goes wrong. If you have a clear plan, time to manage trades and confidence in your own choices, a contractor can be the leaner route. If you want the flat resolved as one coherent scheme, the design fee tends to pay for itself in avoided mistakes.
Whichever route you choose, insist on an itemised quotation so you are comparing the same scope. A headline figure that looks cheaper often excludes haulage, protection, permits or a second toilet, which then reappear as variations. Our services overview explains how a design-and-build approach works for HDB flats, and the principles for vetting any firm are covered in our guide on how to choose a renovation contractor.
FAQ
Is SGD 50,000 enough to renovate a 4-room HDB?
For a BTO or a resale flat in decent condition, SGD 50,000 covers a comfortable mid-range renovation with full carpentry, new flooring and one refreshed toilet. If the flat needs heavy hacking and two full toilets, you may need to trim finishes or extend the budget.
Why is carpentry so expensive in a 4-room flat?
Carpentry is custom-made, labour-intensive and uses materials such as plywood carcasses, laminates and hardware. A 4-room flat usually needs wardrobes, a full kitchen, a TV console and storage, so the cumulative cost is significant.
How much do BTO and resale costs differ?
A resale 4-room flat typically costs SGD 8,000 to SGD 20,000 more than an equivalent BTO because of hacking, rewiring and pipe works that a brand-new flat does not require.
Should I include a contingency in my budget?
Yes. Set aside 10 to 15 per cent. Hidden issues such as uneven screed, old wiring or waterproofing failures only appear once works begin, and a buffer keeps the project on track.
Does using an interior designer cost more than a contractor?
A designer typically costs more upfront because the fee covers space planning, sourcing and project coordination. The trade-off is a more cohesive result and fewer costly changes mid-project.
Planning a 4-room HDB renovation and want a realistic, itemised quote for your flat? Book a consultation with Elements and we will help you set a budget that matches how you actually live.