The 3 Best HDB Window Choices for Singapore Flats

When it comes to HDB windows, Singapore’s flourishing contractor industry presents homeowners with a plethora of options. Whether it’s the material or the type of opening, the list of choices is long and can often be overwhelming. However, the hot and humid climate in Lion City requires careful consideration, especially for those just starting their renovation. With the varying prices, features, and models, selecting the right HDB window for your home can be overwhelming.

Luckily, Singapore residents have clear preferences, with awnings, casements, and sliding windows being the best HDB windows. While each type has pros and cons, you should consider every detail before deciding what suits your flat best. Here’s what professional HDB window contractors will tell you about the top 3 most preferred window choices in Singapore:

Overview of the HDB Windows Market

Replacing an HDB window in Singapore is relatively straightforward if you follow simple rules. First, you must hire a professional HDB window contractor with the necessary licensing from the BCA and the HDB’s Directory of Renovation Contractors.


Ensuring you hire a licensed contractor is absolutely mandatory, as failing to install and maintain your units properly may result in incidents, fines of up to $10,000, and even jail. In this regard, you must choose the right replacement HDB windows to fit the criteria of balancing cost, appearance, durability, and safety.


Replacing HDB windows can cost around $300 to $900 per window and up to a few thousand for an entire flat. For example, a 2×4 window can cost $280, while a 4×9 unit can cost $380. Whatever the case, you should also consider the material and labour costs. In most cases, homeowners lean towards aluminium windows due to their popularity, affordability, and durability.

Safety Concerns

In 2023, authorities reported 35 cases of fallen windows, highlighting the urgent need for HDB window design improvements. The HDB and town councils have increased safety inspections and are advising flat owners to replace old windows. The three best materials for new HDB windows are:

Aluminum Windows

Double-glazed aluminium window

Perhaps aluminium windows are the most popular window material for HDB flats. They are affordable, durable, and secure, and they can last from 15 to 25 years with minimal maintenance. Best of all, they come in a wide range of minimalist styles that suit most facades.

UPVC Windows

UPVC windows are another affordable and low-maintenance option that can last for decades. The durable plastic lasts 20-30 years and is available in various styles. However, UPVC windows may not suit flats in conservation areas or with a traditional facade.

Wooden Windows

Wooden windows are an attractive and eco-friendly choice that lasts 10 to 15 years. The material can give any home an authentic and traditional look, hence its expensive price. Still, it requires strict maintenance due to its proneness to rotting and warping in Singapore’s hot and humid climate.

Read here on why we recommend aluminium windows as compared to PVC or wooden windows.

HDB Casement Windows: A Popular and Versatile Choice

Casement Aluminium windows

Casement windows are the standard option for most regular HDB homes. Homeowners choose them not only because they are affordable but also because of their ventilation properties and unobstructed views.

Maximum Ventilation and View

Casement windows offer unbeatable comfort and sunlight penetration when it comes to providing airflow. They can open fully, giving their owner an unobstructed view of the outdoors. Besides, you can still position a few plant boxes on the window sill.

Durable and Low-maintenance

HDB casement windows are made of aluminium, making them durable and weather-resistant. The frames do not corrode or rust over time, requiring little maintenance. The multi-point locking mechanisms also provide enhanced security.

Complement Modern Architecture

Casement windows have a sleek, minimal design that pairs well with contemporary building styles. Their clean lines help create an uncluttered look that many homeowners desire. The variety of colour options for the aluminium frames also makes it easy to find a shade that matches your home’s exterior.

Space-Efficient Solution

Casement windows are hinged on one side, so they do not require additional space for sliding panels. This makes them ideal for small rooms or in layouts where space is limited. When open, the window panels fold neatly to the side, minimising their footprint.

Sliding Windows for HDB Flats: Sleek and Space-Saving

Sliding aluminium window

Arguably, sliding HDB windows are a hit in HDB flats. They offer a space-efficient design that eliminates the need for swing clearance. When it comes to limited spaces, anything that allows maximising the opening area is welcome.

Maximise Ventilation and Natural Light

Sliding windows can provide ample ventilation and natural light for HDB flats. Their large glass panels and full-width opening allow for an open, airy feel and panoramic views. For the best results, opt for sliding windows along the entire wall to create an open-plan layout.

Low-Maintenance and Durable

One thing about sliding windows is their sliding mechanism. Since it has only a few moving parts, it’s easy to open and less prone to breakdowns. These windows are also weather-resistant, helping to protect against wind, rain, and pollution. If you’re looking for a combination of durability and low maintenance, aluminium sliding windows with tempered glass for the panes will surely last you a lifetime.

Cost-Effective Solution

Sliding windows are an affordable option for HDB flats. Basic sliding windows with clear glass panes can cost between $200 and $500 per square meter. For enhanced security, consider sliding windows with tinted or laminated glass, which provides insulation and noise reduction. Promotion packages for sliding windows and window grilles in HDB resale flats often start around $1,888, making replacement or upgrades budget-friendly.

Awning Windows for Natural Ventilation

Awning Mild Steel Windows

Awning windows are less popular but are increasingly trending as alternatives to casement and sliding windows. They are hinged at the top and open outward from the bottom, making them perfect for increased natural ventilation and airflow. Best of all, homeowners often install them for a mix of decent air circulation and security.

Increased Airflow

When open, awning windows direct airflow up and out, pulling hot air up and out of the room. The outward-opening design allows maximum airflow for the window size. Unlike inward-opening windows, You can open wide awning windows without the sash protruding into the room.

Flexible Ventilation

Awning windows can be opened at multiple widths to suit your needs. Open them slightly for fresh air, moderately for good ventilation on a warm day, or fully open them on opposite walls to create a breeze and maximise cross-ventilation. Their multi-positional design gives you full control over the amount of airflow and natural ventilation in your home.

Weather Resistance

Awning windows are designed to prevent water ingress when partially open. Their outward-opening sash directs water away from the opening, keeping interiors dry. You can leave awning windows open during light rain without worrying about water damage or puddling on sills. Screens and weatherstripping provide further protection from the elements when the window is open.

Easy Operation

Awning windows are straightforward to operate due to their simple hinge mechanism. They open smoothly and lock securely at your desired position using window hardware like crank handles, locks, or pole operators. This makes them suitable for hard-to-reach areas where sliding or double-hung windows would be difficult to open and close.

HDB Window Maintenance Tips

As mentioned, Singapore’s HDB and BCA authorities urge homeowners to always maintain their HDB windows. For this reason, it’s important to call a contractor to inspect your casements to ensure smooth operation. Moreover, you can perform a few other actions to help keep your units in check.

Regular Inspection and Cleaning

Undoubtedly, having an expert check your HDB windows regularly will ensure peace of mind. A licensed window contractor will inspect the tracks for dirt buildup and debris and apply a lubricant to stuck windows. They will also replace any broken parts like stainless steel rivets, screws or hinges to prevent further damage. You can clean your windows with a glass cleaner to remove any grime and stains and keep your units in optimal condition.

Use Window Locks

Windows locks and safety latches are a common feature of most modern models. Typically, they prevent young children from opening the windows and falling from high-rise flats. While many owners overlook these small additions, they prevent falls by limiting how far the window can open. Alternatively, they provide extra security against intruders.

Apply Weatherstripping

Weatherstripping tape or seals are often an added feature to most window frames. They usually block drafts and improve insulation. However, they may wear down over time and rip or burn from the heat. Luckily, you can easily replace your old weatherstripping tape with one made of vinyl, rubber, or foam. Ultimately, you’ll lower your energy bills and make your home more comfortable.

Check for Condensation

Singapore’s humid weather creates the perfect conditions for condensation and mould growth on windows. You can fight this by improving ventilation and wiping away water spots with a dry cloth. For example, you can run an exhaust fan, especially when cooking or showering. For persistent condensation, you may need professional help to check for any air leaks or insulation issues.

Repair or Replace When Needed

If your HDB windows show signs of damage, such as cracks, rot, or corrosion, that cannot be repaired, it is best to replace them. Replacement windows must meet HDB requirements for safety, ventilation, and design. Check with your town council on the proper procedures for window replacement to avoid penalties.


In conclusion, replacing your HDB windows is about making an informed choice. While the material and budget requirements are crucial, what’s essential is the type of opening. After all, you wouldn’t want to have windows you don’t use effectively.

Of course, you should consider other factors, like getting windows with Low-E glass to reduce heat gain. Also, check for SLS certification and warranty terms to ensure you’re hiring licensed professionals.

With the right window choice, you can enjoy improved natural light, ventilation, views, and curb appeal. Your home will feel cooler, look brighter, and gain value over time. So take your time and choose carefully when upgrading the windows in your HDB flat.

AT Aluminium is one of the best suppliers of aluminium windows in Singapore. Apart from that, we also offer mild steel gates to enhance your home security further. Talk to us today!