A crack appears.
A ceiling stains.
A corridor light fails.
A lift stops.
A window loosens.
Residents often describe all of these as “HDB defects.”
Operationally, they do not belong to one responsibility bucket.
The first question is not simply what is wrong?
It is:
WHICH PART OF THE BUILDING SYSTEM DOES THE PROBLEM COME FROM?
For the broad maintenance split, see How HDB, Town Councils and Homeowners Divide Maintenance. For new-flat handover defects, see How the HDB Defects Liability Period Works. For the whole public-housing system, return to How HDB Works in Singapore.
This article reflects HDB guidance available on 4 September 2026.
Quick Answer
The practical routing rule is:
INSIDE A NEWLY COMPLETED FLAT, DURING THE DLP → HDB / BUILDING SERVICE CENTRE FOR QUALIFYING HANDOVER DEFECTS
INSIDE YOUR FLAT AFTER THE DLP → USUALLY HOMEOWNER MAINTENANCE
COMMON PROPERTY → TOWN COUNCIL
HDB states that Town Councils manage and maintain common property such as corridors, void decks, lifts, water tanks, public lighting and open spaces.
Official HDB guidance: Function of HDB Branches and Town Councils.
But the visible location of the damage can mislead you.
A stain inside your flat can come from common property.
A leak in your neighbour’s ceiling can come from your bathroom floor.
So responsibility follows the source, not merely the surface where the symptom appears.
Wait, What? “Inside My Flat” Does Not Always Mean “My Fault”
Suppose water appears on the ceiling of a top-floor unit.
The stain is inside the private home.
But if the source is the common roof, the Town Council is responsible for the common property repair.
Now take an inter-floor ceiling leak between two flats.
The stain is inside the lower flat.
The source may be deterioration in the upper flat’s wet-area waterproofing system.
Same visible symptom.
Different source.
Different responsibility.
Three Layers Sit Around Every HDB Defect
Layer 1 — The Private Flat
The homeowner is responsible for the upkeep and maintenance of the flat interior and its fittings and fixtures once ordinary ownership responsibility applies.
Layer 2 — Common Property
The Town Council manages the shared estate systems and spaces serving multiple households.
Layer 3 — New-Flat Handover
During the one-year DLP for a newly completed flat, qualifying construction defects inside the unit can enter HDB’s rectification process.
The same physical item can therefore move between responsibility layers as time passes.
New-Flat Defects Have a Temporary HDB Route
For newly completed flats, HDB provides a one-year DLP from key collection.
During that time, homeowners can report items for verification and rectification through the Building Service Centre or online process.
HDB advises reporting within the first month and before renovation starts.
That temporary handover layer is specific.
It should not be confused with permanent Town Council responsibility for common property or permanent homeowner responsibility for the interior after the DLP.
After the DLP, the Flat Interior Becomes an Ordinary Maintenance Responsibility
After the one-year DLP, HDB states that homeowners can engage their own contractor to rectify issues and approach the HDB Branch if further assistance is required.
Under the Agreement for Lease, homeowners are responsible for keeping their fittings and fixtures in good condition.
The flat has moved fully into the long-term ownership state.
Common Corridors Belong to the Town Council Layer
The corridor outside your flat is not part of your private repair budget.
It is common property.
Town Councils are responsible for its maintenance and management.
This includes the ordinary repair and upkeep of the corridor environment, subject to the exact defect and applicable estate works.
Lifts Are a Clear Common-Property Example
A lift may stop outside your floor.
The inconvenience feels personal.
The asset is shared.
The Town Council owns the estate-maintenance path, while BCA regulates lift safety and operating requirements.
Existing owner: How HDB Lift Maintenance Works.
Roofs and External Walls Can Turn an Indoor Symptom Into a Common-Property Case
HDB’s ceiling-leak guidance states that for leaks coming from common property such as an external wall or rooftop, the Town Council bears the repair responsibility for that common source.
Official HDB guidance: Preventing and Fixing Ceiling Leaks in HDB Flats.
Again, the location of the stain is not enough.
You need the source path.
Windows Are a Boundary Case
A window sits on the façade and looks like part of the building exterior.
But HDB and BCA place ongoing window maintenance responsibility on the flat owner.
This shows why “outside-looking” does not automatically mean Town Council.
Existing owner: How HDB Windows, Grilles and Air-Conditioners Stay Safe on the Façade.
The Floor Slab Is Another Boundary Case
Your bathroom floor and your downstairs neighbour’s ceiling are opposite faces of the same physical slab.
That makes inter-floor seepage a shared-responsibility problem between private homes rather than an automatic Town Council case.
The next article owns that investigation path.
Diagnosis Comes Before Routing
When the source is uncertain, the best first step is not arguing over who should pay.
It is establishing what failed.
Useful questions include:
- Does the problem occur only during rain?
- Does it appear after the upstairs bathroom is used?
- Is the affected component shared by many units?
- Did the defect exist before renovation?
- Did a contractor alter the area recently?
- Is the source the roof, façade, corridor, shared pipe or private fitting?
Responsibility becomes clearer after the failure path becomes clearer.
Timing Can Change the Correct Route
A defective fitting discovered two weeks after key collection may belong inside the DLP process.
The same type of fitting failing eight years later may be ordinary homeowner maintenance.
A wall damaged by the owner’s renovation is different again.
Location alone does not decide responsibility.
Cause and time matter too.
Renovation Can Move the Boundary
HDB specifically advises new homeowners to report defects before renovation because renovation can create ambiguity over whether the problem was inherent or caused by private works.
A waterproofing leak after bathroom hacking.
A cracked wall after demolition.
A loose window after replacement.
These cases require a causal investigation rather than a simple “it is still within one year” argument.
Common Property Is Defined by Shared Function
HDB’s current guidance gives practical examples:
- corridors;
- void decks;
- lifts;
- water tanks;
- public lighting;
- open spaces.
The common thread is not simply that these things are outdoors.
They serve the estate collectively.
A shared system needs a shared maintenance owner.
Private Property Is Defined by Household Control and Use
Inside the flat, the household controls most fittings, finishes and ordinary repair decisions.
That control comes with maintenance responsibility.
Ownership is therefore not only the right to use and renovate.
It is also the obligation to maintain the private layer.
Failure Mode: Calling HDB for Every Common-Property Problem
Residents often use “HDB” as shorthand for the whole estate.
That can route a maintenance issue to the wrong operational owner.
For common-property defects, the relevant Town Council is usually the practical first route.
Failure Mode: Paying Privately for a Common-Property Defect
A resident sees a leak or damaged component near the flat and immediately hires a contractor.
If the source is shared common property, private intervention can create access, liability and coordination problems.
Identify the owner of the system before altering it.
Failure Mode: Assuming the Town Council Owns Every External-Looking Fixture
Windows and some private façade fixtures remain owner responsibilities.
The better test is not appearance.
It is function, ownership and the applicable HDB or BCA rule.
The Five-Question Routing Test
- Where is the symptom?
- Where is the likely source?
- Does the failed component serve one household or multiple households?
- Is the flat still inside its one-year DLP?
- Has renovation or owner alteration changed the original condition?
Those questions will route most ordinary defect cases more accurately than the phrase “HDB defect.”
Forward Play: Follow One Ceiling Stain
A ceiling stain appears.
The resident does not assume responsibility from location alone.
The source is investigated.
If the source is the upper flat’s wet area, the private-flat responsibility route applies.
If the source is a common roof or external wall, the Town Council route applies.
One symptom has become two possible systems.
Reverse Play: Start From the Correct Repair Party
Why did the Town Council repair this issue?
Because the failed source was common property.
Why did the homeowner pay for that other issue?
Because the failed component belonged to the private flat after the DLP.
Why did HDB rectify the third issue?
Because it was a qualifying new-flat defect inside the one-year handover period.
Correct routing begins with correct classification.
The Deeper Housing Principle
High-rise housing is physically continuous but legally layered.
One building contains private homes, common property, public-housing obligations and time-limited handover responsibilities.
A defect exposes the boundary between those layers.
The Deepest Answer
Unit defect versus common-property defect is not really a question about where you can see the damage.
It is a question about which system failed.
The private flat.
The shared estate.
Or the temporary new-flat handover process.
Find the source.
Find the time state.
Find the system owner.
Then the repair path becomes much clearer.
Continue Through the HDB System
Return to How HDB Works in Singapore.
Previous: How the HDB Defects Liability Period Works.
Next: How Inter-Floor Water Seepage Is Investigated in HDB Flats | Following the Leak Back to Its Source.