How Much Does an HDB Renovation Cost in Singapore? (2025 Guide)

Overview: What Does HDB Renovation Cost?

Renovating an HDB flat is one of the biggest financial decisions a Singapore homeowner will make. Costs can range from around S$30,000 for a basic 3-room refresh to well above S$100,000 for a fully customised 5-room or Executive flat.

These are market estimates only and may vary significantly based on your requirements, materials chosen, and firm engaged.

The final number depends on many factors — the age of the flat, the extent of hacking and structural changes, the quality of materials, and the interior design firm or contractor you work with. Understanding the typical cost ranges helps you set realistic expectations and avoid surprises.

Estimated Costs by Flat Type

Below are broad estimated cost ranges for full renovation packages. These are market estimates only and may vary significantly based on your requirements, materials chosen, and firm engaged.

2-Room Flexi / BTO (approx. 36–45 sqm) - Basic renovation: S$25,000 – S$40,000 - Mid-range renovation: S$40,000 – S$65,000 - High-end / fully custom: S$65,000 and above

3-Room Flat (approx. 60–75 sqm) - Basic renovation: S$30,000 – S$50,000 - Mid-range renovation: S$50,000 – S$75,000 - High-end / fully custom: S$75,000 and above

4-Room Flat (approx. 90–105 sqm) - Basic renovation: S$40,000 – S$60,000 - Mid-range renovation: S$60,000 – S$90,000 - High-end / fully custom: S$90,000 and above

5-Room Flat (approx. 110–130 sqm) - Basic renovation: S$50,000 – S$75,000 - Mid-range renovation: S$75,000 – S$110,000 - High-end / fully custom: S$110,000 and above

Executive Apartment / Maisonette (approx. 140–160+ sqm) - Basic renovation: S$65,000 – S$90,000 - Mid-range renovation: S$90,000 – S$130,000 - High-end / fully custom: S$130,000 and above

These ranges assume a full renovation. If you are doing a partial renovation — for example, only replacing flooring and repainting — costs will be substantially lower.

Typical Cost Breakdown by Trade

Understanding where the money goes helps you prioritise and control costs. Here is a typical breakdown for a mid-range 4-room HDB renovation. These are market estimates only and may vary significantly based on your requirements, materials chosen, and firm engaged.

Hacking and Demolition (S$2,000 – S$8,000) This includes removing existing walls (subject to HDB approval), tiles, and carpentry. Costs depend on the amount of existing work being demolished and disposal fees.

Carpentry and Joinery (S$15,000 – S$40,000) Custom carpentry — kitchen cabinets, wardrobe, TV feature wall, storage units — is typically the largest single cost item. The type of material (laminate, lacquer, solid timber) significantly affects pricing.

Flooring (S$5,000 – S$15,000) Vinyl, engineered timber, homogeneous tiles, and marble are common choices. Larger format tiles and premium materials cost more. Laying tiles over existing tiles (overlay) is cheaper than full hacking.

Electrical Works (S$3,000 – S$8,000) Rewiring, adding power points, feature lighting, and smart home systems. Older flats may require full electrical panel upgrades. Always use a licensed electrician.

Plumbing (S$2,000 – S$6,000) Bathroom and kitchen plumbing, including new sanitary ware, basin, shower, and water heater. Resale flats often require more extensive pipe replacement.

Painting (S$2,000 – S$5,000) Walls, ceilings, and feature walls. Premium paints (anti-mould, water-based, textured) cost more. This is often one of the areas where homeowners can save by choosing standard finishes.

Interior Design Fees (S$3,000 – S$15,000+) If you engage an ID firm rather than a renovation contractor, expect a design fee on top of the renovation cost. Some firms include this in the package; others charge separately.

Miscellaneous and Contingency Always budget 10–15% above your estimate for unforeseen works — especially in resale flats where hidden issues (water damage, old wiring) can surface during renovation.

What Affects the Final Cost?

Several key factors will push your renovation cost up or down:

Flat condition (BTO vs resale) A brand new BTO flat requires less hacking and preparation work. Resale flats, especially those 15–20+ years old, often need additional works like pipe replacement, re-waterproofing of bathrooms, and new electrical panels. Budget 15–25% more for resale renovation compared to BTO.

Scope of works Are you doing a full renovation (every room, all new carpentry, flooring, fixtures) or a selective refresh (repaint, new kitchen, one bathroom)? A full renovation will always cost significantly more.

Material choices The difference between laminate and lacquer cabinet finishes, vinyl and marble flooring, or standard and premium tiles can easily double the material cost. Be clear about where you want to spend and where you are comfortable saving.

ID firm vs renovation contractor Interior design firms typically charge higher fees but offer a more comprehensive service — space planning, 3D renderings, project coordination. Renovation contractors are usually more affordable for straightforward works. Neither is universally better; it depends on your needs.

Timeline and demand If you need works completed urgently (moving-in deadline), some firms charge a premium. Peak periods like public holiday seasons can also affect availability and pricing.

Location Firms and contractors with studios in prime areas (Orchard, CBD) sometimes charge more. This does not always correlate with quality.

HDB Rules Homeowners Must Know

HDB has specific rules governing what you can and cannot do during a renovation. Violating these rules can result in fines and mandatory reinstatement at your expense.

Renovation Permit Most structural works, hacking of walls, and plumbing changes require a HDB Renovation Permit before work begins. Your contractor or ID firm should apply on your behalf via the HDB e-Service portal. Do not allow work to start before the permit is approved.

Approved Contractors Certain works — gas, electrical, and structural — must be carried out by HDB-approved contractors or licensed professionals. Check the HDB website to verify your contractor's approvals.

Restriction on Wall Removal You cannot remove any load-bearing walls without HDB's written approval. Even non-structural walls may require notification to HDB before hacking.

Wet Works Timing HDB stipulates that renovation work involving noise (hacking, drilling) is only permitted on weekdays (Monday to Saturday) between 9am and 6pm. No renovation work is allowed on Sundays and public holidays.

No Unauthorised Extensions Adding structures (shelters, extensions) to your flat without HDB's approval is not permitted. This includes closing up balconies or bay windows.

Plumbing and Waterproofing Any bathroom or kitchen plumbing works must follow HDB's plumbing guidelines. A 24-hour ponding test (flood test) is typically required after waterproofing works.

For the most current and complete rules, always check the official HDB website or consult your ID firm.

Tips to Manage Your Renovation Budget

Renovating within budget is very achievable with the right approach. Here are practical tips from experienced homeowners:

Get at least 3 quotes Never accept the first quote you receive. Prices vary significantly between firms for identical scopes of work. Getting 3 comparable quotes gives you a market baseline and negotiating leverage.

Separate wants from needs List the works that are essential (functional bathroom, working kitchen, safe electrical) versus desirable (custom carpentry, marble countertops, smart home). Prioritise the essentials and add desirables only if budget allows.

Reuse where possible Not everything needs replacing. In resale flats, existing tiles in good condition can be retained and overlaid. Existing wiring that passes inspection can stay. Existing sanitary ware in good condition does not need replacement. Ask your contractor what can be retained.

Be specific in your brief Vague briefs lead to inaccurate quotes and scope creep. The more specific you are about materials, finishes, and scope, the more accurate your quote will be — and the less likely you are to face unexpected add-ons.

Avoid scope changes mid-renovation Changing your mind after works have started is the fastest way to blow a budget. Every scope change after contract signing typically incurs a variation order cost. Make decisions before signing, not during.

Hold a contingency Set aside 10–15% of your total budget for unforeseen works. This is especially important for resale flats. Having a contingency means surprises do not become crises.

Time your renovation strategically Some firms offer off-peak discounts or more flexibility during slower periods. If your move-in date is flexible, you may be able to negotiate better pricing.