According to HDB’s latest figures, over 1 million HDB flats house more than 80% of Singapore’s population — and a 2024 Qanvast survey found that the average Singaporean spends between $50,000 and $75,000 renovating a 4-room flat. With renovation demand rising 18% year-on-year, choosing the right contractor and understanding the process has never been more important. Planning an HDB renovation in Singapore is one of the most exciting — and sometimes overwhelming — projects you’ll undertake as a homeowner. This complete guide covers everything you need to know before you begin.
Reference sources: HDB Official Renovation Guidelines | Qanvast Singapore Renovation Cost Guide 2024 | BCA Alterations & Additions Guidelines
What Is HDB Renovation and Why Does It Matter?
HDB flats are the backbone of Singapore’s housing landscape. A well-planned HDB renovation Singapore project does more than improve aesthetics — it maximises the use of your space, improves your quality of life, and can even increase the resale value of your flat. Studies show that renovated HDB flats command a resale premium of up to 10–15% compared to un-renovated units in the same block.
At InnerGlow Design, we’ve been transforming HDB flats across Singapore since 2000. Over the years, we’ve seen the common mistakes homeowners make and, more importantly, how to avoid them.
HDB Renovation Rules You Must Know in 2026
Before swinging a single hammer, you need to understand HDB’s renovation guidelines. Non-compliance can result in fines and mandatory reinstatement — costing you more in the long run.
- Permit required for hacking works: Any removal of walls — including non-structural ones — requires a permit from HDB. Always check before proceeding.
- Wet works timing: Noisy renovation work (hacking, drilling) is only permitted Monday to Saturday, 9am to 6pm. No work is allowed on Sundays and public holidays.
- Floor finishes: You must lay a 3mm acoustic underlay beneath all hard floor finishes in bedrooms and living areas to reduce noise transmission to your neighbours.
- Bathroom waterproofing: New waterproofing must be applied if the original is hacked. This is mandatory, not optional.
- Electrical works: All electrical work must be carried out by a licensed electrician and certified by the Energy Market Authority (EMA).
How Much Does HDB Renovation Cost in Singapore?
Renovation costs in Singapore vary widely depending on flat type, scope of works, and materials chosen. Here’s a general guide for 2026:
2-Room / 3-Room flat: Basic $20,000–$35,000 | Mid-range $35,000–$55,000 | Full luxury $55,000+
4-Room flat: Basic $30,000–$50,000 | Mid-range $50,000–$75,000 | Full luxury $75,000+
5-Room / Executive: Basic $45,000–$65,000 | Mid-range $65,000–$90,000 | Full luxury $90,000+
Step-by-Step: The HDB Renovation Process
Step 1: Set Your Budget and Brief
Before contacting any renovation company, get clear on your priorities. What matters most to you — kitchen functionality, open-concept living, or storage solutions? List your must-haves vs nice-to-haves. This brief will shape every decision that follows.
Step 2: Choose the Right Renovation Company
This is the most critical decision in your entire renovation journey. Look for a contractor who is HDB-registered, has a strong portfolio of completed HDB projects, provides a detailed itemised quotation — not a lump sum — and has verifiable reviews from past clients. InnerGlow Design is a fully HDB-registered renovation contractor with over 20 years serving Singapore homeowners. Contact us for a free consultation.
Step 3: Submit the HDB Renovation Permit
Your renovation company should handle this on your behalf. The permit application is submitted through HDB’s e-Service portal and typically takes 3–5 working days to process. Work cannot legally begin until the permit is approved.
Step 4: Renovation Works Begin
A typical HDB renovation in Singapore takes 6–12 weeks depending on scope. The general sequence is: hacking and demolition, masonry and tiling, carpentry, electrical and plumbing, painting, then final installation of lights, fixtures, and furniture.
Step 5: Handover and Snagging
Walk through the flat with your contractor and create a snagging list — a record of any defects or unfinished items. A professional contractor will rectify all snagging items before final payment is released.
Popular HDB Renovation Styles in Singapore 2026
- Modern Minimalist: Clean lines, neutral palettes, hidden storage — perfect for maximising small spaces.
- Japandi: A fusion of Japanese and Scandinavian aesthetics. Warm wood tones, natural textures, and uncluttered spaces.
- Contemporary: Bold accents, statement lighting, and a mix of materials for a fresh current feel.
- Industrial: Exposed brick, concrete finishes, dark metal accents — popular for larger flats and maisonettes.
Common HDB Renovation Mistakes to Avoid
- Over-budget on materials, under-budget on labour: Skilled workmanship is what makes a renovation last. Don’t cut corners here.
- Ignoring storage needs: Custom carpentry that maximises every square foot is worth the investment.
- No contingency budget: Always set aside 10–15% of your total budget for unexpected costs.
- Rushing the ID brief: Vague briefs lead to costly changes mid-renovation.
- Choosing the cheapest quote: Compare scope, materials, and reputation — not just price.
Ready to Start Your HDB Renovation in Singapore?
At InnerGlow Design, we combine over 20 years of renovation expertise with a genuine passion for beautiful, liveable spaces. From 3-room HDB flats in Tampines to 5-room executive maisonettes in Bishan, we have helped hundreds of Singapore families create homes they love. Submit a free enquiry today and one of our experienced design consultants will get back to you within one working day.