HDB Casement Window Regulations in Singapore: What Every Homeowner Should Know

Replacing or installing new casement windows in your HDB flat isn’t as simple as picking a design you like — it must follow strict HDB window regulations for safety and compliance. Many homeowners are unaware that improper installation can lead to fines or even legal action if windows fall off.

This guide explains the key HDB casement window rules, safety requirements, and the importance of hiring an HDB-licensed contractor to ensure your home stays safe and compliant.

1. Why HDB Regulates Casement Window Installations?

Over the years, HDB has introduced strict window installation rules after several incidents of windows dislodging and falling from high-rise flats. These accidents pose serious safety hazards to pedestrians and property below.

To prevent such risks, all HDB window installations — including casement windows must be installed by trained, HDB-licensed contractors.

2. Maximum Panel Width for HDB Casement Windows

One of the most important HDB casement window regulations is the limit on maximum panel width.

Each casement window panel must not exceed 700 mm in width. This rule ensures that the hinges can safely support the weight of the glass and reduces the risk of the window dislodging during strong winds.

In addition, a wide casement window panel increases the safety risk for users — especially when closing or cleaning the window. A larger panel requires users to reach further outside, which can be dangerous for high-floor units.

3. Approved Accessories For Casement Windows

HDB requires that all casement windows use approved materials and hardware for safety and durability.

• For example friction stay: 304 Stainless steel, 2.50 mm thickness and are at least half the width of the window panel

  
  

4. Mandatory HDB Permit for Window Replacement

If you plan to replace or modify your HDB windows, a permit from HDB is required. Your appointed contractor will handle the documentation and submit the necessary details for approval before work begins.

5. Importance of Engaging an HDB-Licensed Contractor

Only HDB-licensed contractors are allowed to carry out window installation or replacement work in HDB flats. They are trained and certified under the BCA (Building and Construction Authority) and HDB to meet safety standards.

✅ If a window falls due to lack of maintenance, homeowners can face a fine of up to $10,000 and/or jail term of up to one year or both.

6. Routine Casement Window Maintenance By Homeowners

Windows in your HDB flat face constant use, rain, and wind, so parts will wear over time. To stay compliant and keep your family and neighbours safe, you must maintain them regularly—poorly maintained windows can dislodge and cause serious injury.

Check your casement windows every 6 months:

• Open/close each panel to ensure smooth operation

• Inspect for loose screws, worn or rusty hinges/friction stays

• Ensure latches lock securely and panels are properly aligned

7. When to Replace Your Existing Casement Windows

You should consider replacing your casement windows if you notice:

• Loose or damaged hinges

• Difficulty opening or closing

• Cracked glass or damaged frame

• Windows that are more than 20 years old

Final Thoughts On HDB Casement Window Regulations in Singapore

Staying compliant with HDB casement window regulations protects your family, your neighbours, and you as a homeowner. Keep panels ≤ 700 mm, use approved accessories (e.g., 304 stainless-steel friction stays), obtain the HDB permit for any replacement, and always engage an HDB-licensed contractor.

Pair that with a simple 6-monthly maintenance check and timely replacement of worn parts, and your windows will remain safe, quiet, and reliable for years.

At Ho Ho, we handle everything end-to-end — site measurement, documentation, HDB permit application, fabrication, and installation — using HDB-approved windows and trained installers. If you’re planning a replacement or need an inspection:

• Explore our Casement Windows