HDB Renovation Cost in Singapore: A Realistic Budget Guide for BTO and Resale Flats

“How much will my renovation cost?” is the first question every new flat owner asks, and the honest answer is: it depends far more on your choices than on your flat size. Two 4-room flats in the same block can easily differ by S$40,000 because of carpentry, hacking and finishes.

This guide gives realistic ranges for planning, explains where the money goes, and shows where you can save without compromising quality.

Quick answer: as a rough planning guide, many owners spend about S$30,000 to S$60,000 renovating a 4-room BTO flat and about S$50,000 to S$100,000 for a 4-room resale flat. Resale flats cost more because they usually need hacking, rewiring and replumbing. These are indicative ranges only; your quotations are what count.

Indicative HDB renovation costs

These figures assume a full renovation by a contractor or interior design firm and exclude furniture, appliances and soft furnishings. Minimalist renovations can come in well below the low end; premium finishes and extensive carpentry can exceed the top end.

Why resale flats cost more

A BTO flat is a blank canvas in good condition. A resale flat usually comes with years of wear and someone else’s design choices. Typical additional costs include:

• Hacking and disposal of existing tiles, carpentry and fixtures
• Rewiring, especially for older flats where wiring is decades old
• Replumbing and replacing old pipes and water heaters
• Replacing windows, which must be done by a BCA Approved Window Contractor
• Waterproofing bathrooms after hacking

Where the money goes

Every project is different, but carpentry and wet works usually take the largest share.

Five decisions that swing your budget the most

1. How much carpentry you build

Custom carpentry is priced largely by foot run. A full-height wardrobe wall, a feature TV console and a full-length kitchen with tall units add up quickly. Consider loose furniture for some storage, which you can take with you when you move. See our guide to carpentry specialists for quality markers.

2. Hacking vs overlaying

Overlaying new vinyl flooring or tiles over existing ones avoids hacking and disposal costs. It isn’t always possible, but when floors are level and well bonded, it can save thousands.

3. Your finishes

Materials drive cost at every step: compact laminate vs standard laminate, quartz vs solid surface countertops, large-format porcelain tiles vs standard sizes. Pick one or two places to splurge, such as the kitchen countertop, and keep the rest sensible.

4. Contractor vs interior designer

An interior designer adds design and project-management value, which is reflected in the price. A contractor can be more economical if you are confident making design decisions yourself. Our renovation contractor guide explains the trade-offs.

5. Variation orders

Changes made mid-project are the most common reason renovations go over budget. Finalise your design before work starts and keep a contingency of 10 to 15% for genuine surprises, such as hidden pipe damage in resale flats.

Costs people forget to budget for

• Furniture and appliances, which can add 30 to 50% to the renovation spend
• Lighting fixtures (often excluded from renovation quotes)
• Curtains and blinds
• Post-renovation cleaning
• Aircon installation, if not already in place
• Moving costs and temporary storage
• Renovation loan interest, if you are borrowing

How to keep your HDB renovation on budget

1. Set a ceiling and share it. Tell every contractor the same budget and ask them to design within it.
2. Get three itemised quotes. Compare them line by line, not just by total.
3. Finalise designs before signing. Every change afterwards is a variation order.
4. Pay by milestone. Keep deposits small and tie payments to completed work.
5. Prioritise what is hard to change later. Wiring, plumbing and waterproofing are expensive to redo. Decorative items can be upgraded over time.

Financing your renovation

Many banks in Singapore offer renovation loans with lower interest rates than personal loans, typically capped at a multiple of your monthly income and paid directly to the contractor. Compare effective interest rates and fees across banks before committing.

The bottom line

The best way to arrive at a realistic HDB renovation budget is to start with these ranges, decide where you want to spend and where you want to save, then collect itemised quotations from three reputable firms. Your real number will become clear quickly.

Ready to compare firms? See our shortlist of the best HDB renovation contractors in Singapore and best interior designers.