4-Room HDB Renovation Cost Breakdown

Renovating a 4-room HDB flat in Singapore typically costs between S$35,000 and S$70,000 for a resale unit, and roughly S$25,000 to S$45,000 for a new BTO flat that needs less structural work. The final figure depends on the flat's condition, how much you hack and rebuild, the amount of custom carpentry, and the finishes you pick. Where your project lands inside that range is driven far more by scope and material choices than by the size of the flat itself.

A 4-room HDB flat is around 90 square metres, so it sits in the middle of the cost spectrum. New BTO flats start almost blank and mostly need flooring, painting, and carpentry, which keeps costs lower. Resale flats often carry old tiling, dated wiring, and worn fittings, so hacking and replacement push the budget higher. This breakdown walks through each major line item so you can build a realistic number for your own flat.

What is the average cost to renovate a 4-room HDB flat?

As a working reference, a light refresh (painting, some carpentry, minor tiling) can land around S$20,000 to S$35,000, a mid-range renovation sits near S$40,000 to S$60,000, and a full overhaul with extensive hacking and custom carpentry can exceed S$70,000. These are typical market ranges, not fixed quotes, and prices move with material choices and contractor demand.

BTO flats usually cost less than resale flats of the same size because there is little to demolish and the electrical and plumbing are new. Resale flats carry hidden costs: old screed, spoiled waterproofing, and wiring that no longer meets current needs.

How much does each part of the renovation cost?

The table below shows indicative ranges for the main trades in a 4-room flat. Treat them as planning figures; your contractor's site measurement and material selection will set the real numbers.

• Hacking and demolition: S$2,000 to S$6,000, higher if you remove wall tiles, floor screed, and old built-ins
• Masonry, tiling and flooring: S$6,000 to S$15,000 depending on tile grade and area covered
• Carpentry (kitchen cabinets, wardrobes, TV console, feature walls): S$10,000 to S$25,000, usually the single largest item
• Electrical works and rewiring: S$3,000 to S$8,000, more if you add many points or upgrade the distribution board
• Plumbing and sanitary works: S$2,000 to S$5,000 plus fittings
• Painting: S$1,500 to S$4,000 for the whole flat
• Ceiling, partitions and false ceiling with cove lighting: S$2,000 to S$6,000
• Glass, windows, and grilles: S$1,500 to S$5,000
• Cleaning, disposal, haulage and protection: S$800 to S$2,000

Why does carpentry cost so much?

Carpentry is almost always the biggest slice of an HDB renovation because it is custom-built to your walls and made from sheet materials, hardware, and labour that add up quickly. A run of kitchen cabinets, a few wardrobes, and a couple of feature units can easily reach S$10,000 to S$25,000 on their own.

You can control this cost by choosing laminate over solid surface, keeping cabinet runs simple, and reusing existing wardrobes where they are still sound. Soft-close hinges, tall units, and premium countertops such as quartz or sintered stone all add up, so decide early where the money is worth spending.

What extra costs do people forget?

Beyond the trades, several items regularly surprise homeowners and should sit in your budget from the start.

• HDB renovation permit and licensed contractor requirements for hacking and certain works
• Air-conditioning supply and installation, often S$2,500 to S$6,000 for a multi-split system
• Loose furniture, curtains, blinds, and lighting fixtures, which are usually not in the renovation quote
• Appliances such as hob, hood, oven, and washer
• A contingency buffer of around 10 percent for surprises found once hacking begins
• Interior design fees if you engage a designer rather than a contractor directly

How can I keep the cost down without cutting corners?

The biggest savings come from reducing hacking and keeping the existing layout, since moving walls, kitchens, and bathrooms triggers demolition, tiling, plumbing, and waterproofing all at once. Retaining serviceable flooring and repainting instead of retiling can save several thousand dollars.

Spend on the things that are hard to change later, such as waterproofing, wiring, and good hinges, and economise on finishes that are easy to swap, such as light fittings and loose furniture. Getting two or three itemised quotes for the same scope also helps you compare fairly and avoid vague lump sums.

Who should carry out the work?

For hacking, wet works, and electrical changes, the work must be done by an HDB-registered renovation contractor, and electrical work on the distribution board should be handled by a Licensed Electrical Worker. Using the right people protects your warranty and keeps the flat compliant with HDB rules.

If you want a single team to plan the layout, coordinate the trades, and handle the renovation, electrical, and plumbing together, our HDB renovation contractor service covers the full scope for 4-room flats. Working with one accountable contractor reduces the finger-pointing that happens when separate parties handle demolition, wiring, and plumbing.

Frequently asked questions

How long does a 4-room HDB renovation take? Most 4-room renovations run about 6 to 10 weeks, with resale flats needing longer because of hacking and rewiring, and BTO flats often finishing faster.

Do I need an HDB permit to renovate my 4-room flat? Yes for many works, including hacking, and your registered contractor normally applies for the HDB renovation permit on your behalf before work starts.

Is it cheaper to renovate a BTO or a resale 4-room flat? A BTO is usually cheaper because it needs little demolition and has new wiring and plumbing, while a resale flat carries hacking and replacement costs.

How much should I set aside as a buffer? Plan for around 10 percent on top of your quoted budget to cover hidden issues such as spoiled waterproofing or old wiring uncovered during hacking.