Cracks in HDB Walls: Which Are Normal, Which Aren’t, and How to Repair Them
Fine hairline cracks in plaster and paint are common in HDB flats and usually cosmetic. They’re fixed with flexible filler and a repaint. Wide, widening, diagonal or stepped cracks, cracks near beams or columns, or cracks with water seepage should be reported to HDB or checked by a professional before you repaint.
Types of cracks and what they usually mean
| Crack | Usually | What to do |
|---|---|---|
| Fine hairline cracks in paint or plaster | Shrinkage or temperature movement, cosmetic | Fill and repaint |
| Cracks along wall-ceiling joints | Movement between materials | Flexible sealant, then paint |
| Cracks around door and window frames | Often minor movement | Monitor, seal and repaint |
| Wide, widening, diagonal or stepped cracks | Possible structural movement | Report to HDB, don’t just paint over |
| Cracks with rust stains or bulging | Possible spalling concrete | Report to HDB |
| Cracks with damp or water stains | Leak or seepage | Fix the water source first |
When to involve HDB
- New flats within the defects liability period: report defects to HDB
- Any crack that is widening, wide, or near structural elements
- Spalling concrete, especially on ceilings
- Cracks in common areas: contact your Town Council
Check HDB’s website for the current process and contacts.
How cosmetic cracks are repaired
- Rake out loose material along the crack
- Fill with a flexible or acrylic filler. Movement joints need a paintable sealant
- Sand smooth once dry
- Spot-seal the repair
- Repaint the whole wall so the patch doesn’t show
Repairing a few cracks with a repaint usually costs $150 to $350. Larger skim-coat repairs cost more. See wall and ceiling repair.
Why cracks come back
- Rigid filler used where the wall moves
- Painting over damp areas
- No sealer on the repair
Cracks and repainting in one job? Our painters handle crack filling, sealing and repainting. Get up to 3 quotes.
FAQ
Are hairline cracks in HDB walls normal?
Fine hairline cracks are common and usually cosmetic. Monitor them and repair during your next repaint.
Who repairs cracks in HDB flats?
Cosmetic cracks inside your flat are usually your responsibility. Report structural concerns or spalling concrete to HDB.
Can I paint over cracks?
Not without filling them first. Paint alone won’t hide cracks, and they’ll reappear.
