Resale flat renovation cost in Singapore: the honest breakdown

The short answer

• 3-room resale: $35,000 to $55,000. 4-room: $45,000 to $70,000. 5-room and executive: $55,000 to $85,000, for a full renovation.
• Resale renovations often cost more than new-flat work because the old home has to come out first. Hacking and disposal alone run $3,000 to $8,000.
• Carpentry is always the biggest line. It is also the one thing you cannot change later, so get the layout right before you choose finishes.
• Ten to fourteen weeks on site for a 4-room, plus three to four weeks of design and selection beforehand.
• Keep about ten percent aside. Older flats reveal things once the walls open, and a buffer is cheaper than a stalled site.

Resale renovation cost by flat type

These ranges reflect full renovations we see across Singapore estates, with hacking, rewiring, both bathrooms redone and new carpentry throughout.

These are indicative market ranges for planning, not a quotation. Resale flats vary enormously in condition, so a proper site visit is the only way to price accurately. We always inspect before we quote.

Why resale costs more than renovating a new flat

A new flat usually needs less removal work. A resale flat is a finished home that must first be taken apart. Hacking, haulage and debris disposal add cost before any new work begins, and older flats sometimes reveal surprises like spalling concrete or corroded pipes once walls open up.

The upside is real too. Resale layouts are usually more spacious, the estates are established with mature trees, schools and MRT already in place, and you can see exactly what you are buying instead of trusting a floor plan. A well renovated resale often ends up more liveable than a brand new flat at the same total outlay, and you move in years earlier.

The hidden works nobody puts in brochures

Waterproofing is the one you cannot skip. If the flat is over ten years old, budget for a new membrane in both bathrooms. Skipping it to save a few hundred dollars risks leaks into the unit below, and that becomes a much bigger bill plus a strained relationship with a neighbour you will see every day.

Electrical rewiring is the other quiet essential. Flats built in the eighties and nineties were not wired for induction hobs, dryers, dishwashers and four aircon units running together. Full rewiring is invisible once done, which is exactly why it disappears from cheap quotations, and it is what makes an old flat safe for the next twenty years.

The third is pipework. Old galvanised pipes corrode from the inside and show up as weak pressure or rust coloured water. Replacing them while the walls are already open costs a fraction of doing it afterwards.

Check the rules before changing the layout

Structural walls and protected building elements cannot be altered without proper professional assessment and approval. Non-structural changes may still need consent from the relevant building or management authority.

Renovation and noisy-work hours vary by property. Planning hacking and drilling into the first weeks keeps the programme orderly and reduces disruption for neighbours.

We identify the requirements for the proposed scope during planning, explain them clearly and coordinate the relevant submissions before work begins.

Where to spend and where to save

Spend on what you touch every day: kitchen carpentry and worktop, bathroom fittings, door hardware, the hob and hood, and the flooring underfoot. These take daily abuse and cheap versions show their age within two years.

Save on what is easy to change later. Feature paint colours, loose furniture, decorative lighting and styling can all evolve as the budget recovers. Built-in carpentry cannot, so get the layout and the build quality right the first time.

The one place people regret saving is storage planning. A resale flat with a well planned hallway of concealed storage feels calmer than the same flat with an expensive feature wall and nowhere to put the vacuum.

A realistic resale timeline

Three to four weeks for design, drawings and material selection. One to two weeks for permits. Then ten to fourteen weeks on site for a typical 4-room, running hacking, wet works and waterproofing, electrical and plumbing, tiling, carpentry installation, painting and final fix in that order.

Carpentry is usually the long lead item. Once your design is confirmed, the workshop needs time, so late layout changes push the whole completion date rather than just one trade.

How we approach resale projects

Every resale project at Quad.R Design starts with a site inspection before any quotation. We check the condition of wiring, pipes, tiles and structure so the number we give you is the number you actually pay, not a low figure that grows later.

Because we design and build in-house, the same team that walks your flat on day one is the team handing you the keys at the end. For older flats especially, that continuity is what keeps surprises small and timelines honest.

Before you sign a resale renovation quotation

1. 01

   Get a site visit before any price

   A quotation given off a floor plan alone is a guess. The condition of tiles, wiring and pipes is what decides the real number.

2. 02

   Ask for line by line pricing

   Compare quotations item by item, not by the total. A cheaper bottom line usually means rewiring, waterproofing or hacking has been left out.

3. 03

   Check what is excluded

   Look specifically for waterproofing, rewiring, haulage, disposal, protective works and permit fees. These are the usual omissions.

4. 04

   Confirm who handles required approvals

   Ask which approvals apply to your scope, who will coordinate them and what documentation you will receive before work begins.

5. 05

   Agree a payment schedule tied to progress

   Payments should follow completed stages, not dates. Never pay a large sum ahead of the work it covers.

6. 06

   Keep a ten percent buffer

   Older flats reveal things. A buffer turns a discovery into a decision rather than a crisis.