2026 HDB Renovation Rules & Regulations: Complete Homeowner Guide
Everything you need to know before starting your HDB renovation. Permits, restricted hours, structural rules, contractor requirements, and how to avoid costly penalties.
Quick Summary: Key HDB Renovation Rules
Must Do
- Get renovation permit before work starts
- Use HDB-registered contractor
- Work only Mon-Sat, 9 AM - 6 PM
- Complete within 3-month permit period
- Waterproof wet areas with ponding test
Must NOT Do
- Hack structural walls, beams, or columns
- Work on Sundays or public holidays
- Modify common areas or corridors
- Do electrical work without LEW
- Exceed 1.5 tonnes floor load limit
In This Guide
1. Renovation Permit Requirements
Before any renovation work begins in your HDB flat, your contractor must apply for a renovation permit through the HDB e-service portal. This is not optional — starting work without a valid permit can result in fines and a stop-work order.
Works Requiring a Permit
- Hacking works — Removing or modifying walls, floors, or ceilings
- Electrical rewiring — Changing circuit layout, adding new circuits, DB box modification
- Plumbing changes — Relocating pipes, adding new water points, drain modifications
- New structures — Platform beds, raised floors, partition walls, built-in cabinets
- Floor overlay — Installing new flooring over existing (tiles, vinyl, laminate)
- Ceiling work — False ceiling installation or modification
Works NOT Requiring a Permit
- Painting walls and ceilings (same colour or different)
- Replacing light fixtures, fans, or power sockets (like-for-like)
- Installing curtains, blinds, or roller shades
- Replacing kitchen sink, tap, or toilet bowl (same location)
- Installing freestanding furniture and shelving
- Replacing door hardware (handles, locks)
Permit Application Process
| Step | Action | Timeline |
|---|---|---|
| 1 | Engage HDB-registered contractor | Before application |
| 2 | Contractor submits application via HDB e-service | Day 1 |
| 3 | HDB reviews and processes application | 3-5 working days |
| 4 | Permit approved — contractor notified | Day 5-7 |
| 5 | Display permit notice at flat entrance | Before work starts |
| 6 | Renovation work begins | After permit approval |
Tip: Your contractor handles the permit application, but you should confirm it has been approved before they start work. Ask for the permit reference number and verify it on the HDB portal.
2. Permitted Renovation Hours
HDB enforces strict renovation hours to minimise disruption to neighbours. These apply to all renovation work, including deliveries and debris removal.
| Type of Work | Monday - Friday | Saturday | Sunday / PH |
|---|---|---|---|
| Noisy works (hacking, drilling, cutting) | 9 AM - 5 PM | Not allowed | Not allowed |
| Quiet works (painting, carpentry, cleaning) | 9 AM - 6 PM | 9 AM - 6 PM | Not allowed |
| Material delivery & debris removal | 9 AM - 6 PM | 9 AM - 6 PM | Not allowed |
Important: “Noisy works” includes any use of power tools, hammering, hacking, drilling, grinding, or cutting. Even installing screws with an electric drill is considered noisy work and cannot be done on Saturdays.
Neighbour Notification
While not legally required, it is strongly recommended to notify your immediate neighbours (above, below, and beside) before renovation starts. Many contractors provide a standard notification letter. This builds goodwill and reduces complaints.
Penalty: Violating renovation hours can result in a fine of up to $5,000 and suspension of the renovation permit. Repeated violations can lead to the contractor being deregistered from HDB.
3. Structural Rules: What You Can & Cannot Change
Understanding structural vs non-structural elements is critical. Modifying structural elements compromises building safety and is a serious offence.
CAN Be Modified
- Non-structural partition walls — Can be hacked or relocated
- Non-structural internal walls — Between living room and bedroom (most flats)
- Kitchen wall — Can convert to open concept (if non-structural)
- Bedroom walls — Can combine rooms by removing partition
- Floor tiles — Can hack and replace
- Ceiling finishes — Can add false ceiling
CANNOT Be Modified
- Structural walls — Load-bearing walls around wet core
- Beams and columns — All beams and columns are structural
- Floor slabs — Cannot cut or core through
- Boundary walls — Shared with neighbours
- Corridor walls — External-facing walls
- Bomb shelter walls — Household shelter cannot be modified
How to Identify Structural Walls
| Method | How It Works | Reliability |
|---|---|---|
| HDB floor plan | Download from My HDBPage portal — structural walls shown in thick lines | Most reliable |
| Wall thickness test | Structural walls are typically 150mm+ thick; partition walls are 75-100mm | Moderate |
| Knock test | Structural walls sound solid; partition walls sound hollow | Unreliable |
| Professional Engineer | PE inspects and certifies — required for any wall hacking | Required |
Floor Load Limits
HDB flats have a floor load limit of 1.5 kN/m² (approximately 150 kg per square metre). This matters when installing:
- • Platform beds — Must not exceed load limit including platform weight + furniture + occupants
- • Heavy stone countertops — Natural marble or granite are significantly heavier than quartz
- • Fish tanks / water features — Water weighs 1 kg per litre; a 200L tank = 200 kg
- • Library walls — Fully loaded bookshelves can exceed floor load limits
Household Shelter (Bomb Shelter) Rules
The household shelter is a protected structure. You are not allowed to:
- Hack, drill into, or modify shelter walls, ceiling, or floor
- Remove or modify the shelter door
- Block the ventilation openings
- You CAN use it as a storeroom, study, or server room — as long as it can be cleared quickly
4. Contractor & Licensing Requirements
HDB requires specific licensing for different types of renovation work. Using unlicensed workers puts you at risk of fines and unsafe workmanship.
| Work Type | Required License | Issued By | How to Verify |
|---|---|---|---|
| General renovation | HDB-registered contractor | HDB | HDB InfoWEB / ContractorSG |
| Electrical work | Licensed Electrical Worker (LEW) | EMA | EMA website |
| Plumbing (sanitary) | Licensed Plumber | PUB | PUB website |
| Structural modifications | Professional Engineer (PE) | PEB | PEB directory |
| Gas work | Licensed Gas Service Worker | EMA | EMA website |
Contractor Deposit Rules
While not regulated by HDB, industry best practice recommends:
- • Initial deposit: No more than 10% of total contract value
- • Progress payments: Tied to milestones (e.g., after hacking, after tiling, after carpentry)
- • Final payment: Retain 5-10% until all defects are rectified
- • Never pay 100% upfront — this is the #1 red flag for renovation scams
Verify before you sign: Use our HDB Contractor Verification Checklist and License Verification Guide to protect yourself from scams.
5. Electrical & Plumbing Regulations
Electrical Rules
All electrical work must be done by an LEW
This includes adding power points, rewiring circuits, DB box changes, and installing ceiling fans
Maximum electrical load: 40A single-phase
Standard HDB supply. Upgrading to 3-phase requires SP Group application and additional cost
RCBO/RCCB protection required
All circuits must have residual current protection. DB box must meet current SS 638 standards
No concealed wiring in bomb shelter
Surface-mounted conduit is allowed; concealed wiring and drilling into shelter walls is not
Plumbing Rules
Licensed Plumber for sanitary works
Required for any work on water supply pipes, waste pipes, or soil pipes
Cannot relocate soil stack or main drains
The main soil stack position is fixed. Toilet bowls should stay near the soil stack to avoid drainage issues
Water heater installation rules
Instant heaters must have ELCB protection. Storage heaters need proper wall mounting with safety valve and drip tray
For more on electrical safety, see our HDB Electrical Emergency Guide.
6. Wet Area & Waterproofing Rules
Wet areas (bathrooms and kitchen) have additional requirements to prevent water damage to your flat and the unit below.
Waterproofing is Mandatory
When hacking bathroom or kitchen floor tiles, waterproofing membrane must be applied before re-tiling. This is non-negotiable.
48-Hour Ponding Test Required
After waterproofing, the area must be flooded with water (50mm+) for at least 48 hours. Check unit below for leaks before proceeding with tiling.
Floor Trap Must Be Maintained
All bathrooms must have a functioning floor trap. You cannot remove or block floor traps during renovation.
Gradient Toward Drain
Bathroom floor must slope toward the floor trap to ensure proper drainage. Minimum gradient of 1:100.
For the complete guide, read our HDB Waterproofing Guide covering costs, processes, and how to choose a waterproofing contractor.
7. Window, Door & Exterior Rules
Window Rules
Grilles are mandatory for windows above ground floor
All windows in flats above the ground floor must have window grilles. This is a safety requirement, especially for families with young children.
Window replacement must match specifications
Replacement windows must match HDB specifications for the flat type. Only BCA-approved window contractors should do this work.
Cannot enlarge or create new window openings
Window openings are structural. You cannot make them bigger, smaller, or create new ones.
Door Rules
- Main door — Can replace with any design, but must swing inward and not obstruct the common corridor
- Gate — Can install a gate outside the main door, but it must not protrude more than 0.5m into the corridor
- Bedroom doors — Can be replaced freely or removed entirely
- Fire-rated doors — Bomb shelter door must remain; cannot be replaced with non-fire-rated door
Exterior & Common Area Rules
You are not allowed to modify any common area or exterior element:
- • No installations on the corridor or void deck
- • No external wall painting or cladding changes
- • No protruding structures from windows or balconies
- • No satellite dishes on external walls
- • Shoe racks outside the door must not obstruct the corridor
8. Renovation Timeline & Extensions
| Flat Type | BTO (Typical) | Resale (Typical) | Max Permit Period |
|---|---|---|---|
| 3-room | 4-6 weeks | 6-10 weeks | 3 months |
| 4-room | 6-8 weeks | 8-12 weeks | 3 months |
| 5-room / Executive | 8-10 weeks | 10-14 weeks | 3 months |
Permit Extensions
If your renovation cannot be completed within the 3-month permit period, your contractor must apply for an extension before the permit expires. Common reasons for delays:
- Material supply delays (especially imported items)
- Unexpected structural issues discovered during hacking
- Waterproofing test failure requiring redo
- Defect rectification during renovation
Tip: Include a completion timeline with penalty clauses in your renovation contract. A typical clause: “Contractor shall pay $X per day of delay beyond the agreed completion date, except for delays caused by force majeure or owner-requested changes.”
9. Penalties for Non-Compliance
| Violation | Penalty | Additional Consequences |
|---|---|---|
| Renovation without permit | Up to $5,000 fine | Stop-work order + mandatory reinstatement |
| Hacking structural walls | Up to $5,000 fine | Mandatory reinstatement by PE + legal action |
| Working outside permitted hours | Up to $5,000 fine | Permit suspension + contractor warning |
| Using unregistered contractor | Up to $5,000 fine | No permit = no work allowed |
| Modifying bomb shelter | Up to $5,000 fine | Mandatory reinstatement + SCDF notification |
| Exceeding permit period | Warning / fine | Must apply for extension immediately |
| Damaging common property | Repair cost + fine | Town Council may take legal action |
Impact on Resale
Unauthorised renovations can seriously impact your ability to sell your flat. Before any HDB resale transaction, HDB conducts an inspection. If unauthorised works are found:
- • The sale cannot proceed until all unauthorised works are reinstated
- • Reinstatement costs are borne entirely by the seller
- • This can delay the sale by weeks or months
- • Buyers may withdraw, causing you to lose the sale entirely
10. Complete Compliance Checklist
Use this checklist before and during your renovation to ensure full compliance with HDB rules.
Before Renovation Starts
During Renovation
After Renovation
Frequently Asked Questions
Do I need a permit to renovate my HDB flat in 2026?
Yes, you need an HDB renovation permit for most renovation works. Your contractor must submit the application through the HDB e-service portal before work begins. Minor works like painting, replacing fixtures, or installing curtains do not require a permit. However, any work involving hacking, electrical rewiring, plumbing changes, or structural modifications requires a permit. The permit is typically approved within 3-5 working days and is valid for 3 months.
What are the permitted renovation hours for HDB flats?
General renovation: Monday to Saturday, 9 AM to 6 PM. Noisy works (hacking, drilling, cutting): Monday to Friday only, 9 AM to 5 PM. No renovation work is allowed on Sundays and public holidays. Violating these hours can result in a $5,000 fine and permit suspension.
What walls can I hack in my HDB flat?
You can only hack non-structural partition walls. Structural walls, beams, columns, boundary walls, corridor walls, and bomb shelter walls must never be modified. Download your HDB floor plan from My HDBPage to identify which walls are structural (shown in thick lines). A Professional Engineer (PE) must assess and certify any wall hacking work.
What happens if I renovate without a permit?
HDB can issue a stop-work order, impose fines up to $5,000, and require you to reinstate the flat at your own cost. Unauthorised works also affect resale — HDB inspects before resale transactions, and you must reinstate any unauthorised modifications before the sale can proceed.
Can I convert my HDB kitchen to open concept?
Yes, if the wall between the kitchen and living room is a non-structural partition wall. Many newer HDB flats have non-structural kitchen walls that can be removed. However, you must verify this with the HDB floor plan and engage a PE to certify. Note that removing the kitchen wall may affect your cooking habits — without separation, cooking odours spread throughout the flat.
Do I need an HDB-registered contractor?
Yes, for any work requiring a permit. Only HDB-registered contractors can apply for renovation permits. For electrical work, you need a Licensed Electrical Worker (LEW). For plumbing involving sanitary or drainage systems, you need a Licensed Plumber. Structural modifications require a Professional Engineer (PE). Verify contractor registration on the HDB InfoWEB or use ContractorSG to find verified contractors.
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