Window Grill Singapore – Complete Guide: All You Need to Know (2026)
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- 16 min read
Choosing the right window grill in Singapore is not just about finding a design that looks good.
A good window grille should improve safety and security while still allowing natural light and ventilation into your home. You also need to consider durability, maintenance, window cleaning, price and how the material performs in Singapore’s hot and humid weather.
At Ho Ho Engineering & Renovation Works, we have manufactured and installed windows and window grill in Singapore since 1976.
With 50 years of experience, we have seen window grille designs and materials change significantly over the years.
Today, homeowners can choose from traditional aluminium grilles, modern slim mild steel grilles, wrought iron designs and cat-proof grilles.
But which one should you choose?
This complete 2026 guide covers window grille types, designs, prices, materials, HDB requirements, child and pet safety, installation, maintenance and frequently asked questions—everything you should know before installing a window grill in Singapore.
What Is a Window Grill?
A window grill, also commonly spelt window grille, is a protective barrier installed at a window opening.
In Singapore, window grilles are commonly installed for three main reasons:
Safety for children and family members
Protection for cats and pets
Additional home security
They are particularly common in HDB flats because many Singaporeans live in high-rise buildings.
The right window grille allows homeowners to open their windows for natural ventilation while maintaining an additional physical barrier at the window opening.
Types of Window Grill in Singapore
There are many window grill designs in the market, but choosing the material is one of the most important decisions.
At Ho Ho, we offer four main window grille options:
Aluminium Window Grill – From $8 psf
Affordable, rust-resistant and low maintenance. This remains one of the most practical choices for HDB homeowners.
Cat-Proof Window Grill – From $12 psf
Designed with closer bar spacing to reduce the possibility of cats squeezing through the grille.
Mild Steel Slim Window Grill – From $28 psf
Features an ultra-slim 6mm front-facing profile for homeowners who prefer a cleaner and more minimalist appearance.
Wrought Iron Window Grill – From $30 psf
A heavier-duty option suitable for homeowners who prioritise security or prefer decorative grille designs.
Window Grille Type | Starting Price | Main Advantage | Best For |
Aluminium Window Grille | From $8 psf | Does not rust & affordable | Most HDB homes |
Cat-Proof Window Grille | From $12 psf | Closer spacing | Cat & pet owners |
Mild Steel Slim Grille | From $28 psf | Slim 6mm appearance | Modern homes |
Wrought Iron Grille | From $30 psf | Heavy-duty construction | Security & decorative designs |
Prices are indicative and depend on quantity, measurements, design, colour and site conditions.
1. Aluminium Window Grill
The aluminium window grille remains one of the most popular window grille choices in Singapore.
There is a simple reason.
It is affordable, practical and does not rust.
For homeowners who want something that requires very little maintenance, aluminium is usually our first recommendation.
Our boss has a simple saying for aluminium grilles:
“Buy one time, use lifetime.”
Of course, no building product is literally maintenance-free forever. Rollers, locks and other moving components may eventually require servicing.
However, aluminium itself does not rust like mild steel or wrought iron, making it particularly suitable for Singapore’s humid environment.
Advantages of Aluminium Window Grilles
Most affordable option, starting from approximately $8 psf
Aluminium does not rust
Low maintenance
Lightweight
Suitable for sliding grille systems
Sliding panels make window cleaning easier
Does not take up additional space when slide open
Available in several colours
Suitable for most HDB homes
Because aluminium is lightweight, it is particularly suitable for sliding window grilles.
The lighter weight also reduces the load placed on the rollers compared with heavier steel grille systems.
What Is the Disadvantage of Aluminium Window Grilles?
The biggest difference is appearance.
A typical aluminium grille has an approximately 20mm front-facing profile.
Our mild steel slim grille, by comparison, has an approximately 6mm front-facing profile.
This means aluminium bars are more noticeable when looking through the window.
Aluminium is also not our first recommendation if maximum security is your main priority.
For ground-floor, corridor-facing or easily accessible windows where security is particularly important, consider mild steel or wrought iron instead.
Aluminium Window Grille Colours: Anodized vs Powder-Coated
The colour and finishing of your window grille can make a surprisingly big difference to the overall appearance of your home.
Our standard aluminium window grille colours include:
Silver | Bronze | White | Black
Other customised colours may be available upon request, although specialised colours generally cost significantly more.
Silver & Bronze Aluminium Window Grill – Anodized Aluminium
Silver and bronze aluminium window grilles generally use an anodized finish.
Anodization creates a durable finish that is integrated with the aluminium surface.
Advantages include:
Good resistance to normal wear
Durable metallic appearance
Low maintenance
More economical than customised colours
Silver and bronze remain practical choices for homeowners who prioritise durability and value.
White & Black Aluminium Window Grill– Powder-Coated Aluminium
White and black aluminium window grilles use a powder-coated finish.
Powder coating provides:
Smooth and consistent colour
Modern appearance
Good resistance to normal chipping and peeling
Easy matching with contemporary window frames
White and black are particularly popular with modern renovation styles.
Our powder-coated white or black aluminium finish costs approximately $2 psf more than our standard anodized finish.
2. Cat-Proof Window Grille
If you have cats at home, a normal window grille may not be sufficient.
Cats can squeeze through surprisingly small openings, especially younger or smaller cats.
A cat-proof window grill uses closer bar spacing to reduce the possibility of a cat squeezing through or falling from an open window.
At Ho Ho, our cat-proof aluminium window grilles start from approximately $12 psf.
What Is the Recommended Gap for a Cat-Proof Window Grille?
For cat-proof applications, we generally recommend grille gaps of less than 2 inches.
However, the appropriate spacing should also take into consideration:
Size of your cat
Age of your cat
Window configuration
Grille opening style
Ventilation requirements
Access required for window cleaning
Tell us that you have cats when requesting your quotation so that we can recommend a suitable configuration.
3. Mild Steel Slim Window Grille
For homeowners looking for a modern window grill design, mild steel slim grilles have become increasingly popular.
The biggest attraction is the appearance.
Our mild steel slim window grill has an approximately:
6mm front-facing profile
Compared with approximately:
20mm for a typical aluminium grille
This creates a much cleaner and less obstructed view.
We sometimes describe it as:
“There, but not there.”
Advantages of Mild Steel Slim Window Grilles
Ultra-slim 6mm front profile
Minimal visual obstruction
Modern and minimalist appearance
Strong material
Better suited to security-conscious homeowners
Less expensive than many wrought iron options
Starting from approximately $28 psf
For homeowners who like the minimal appearance of an invisible grille but prefer a rigid metal grille, a mild steel slim window grille is worth considering.
Does Mild Steel Window Grille Rust?
This is the most important disadvantage you should understand before buying.
Yes. Mild steel can eventually rust.
Our mild steel grilles are powder-coated to improve corrosion resistance, but Singapore has a very humid climate.
Based on our experience, corrosion may eventually appear after approximately 8–10 years, although the actual lifespan varies significantly depending on the environment, exposure and maintenance.
Rust may develop faster when:
The grille is directly exposed to rain
The property is near the sea
The powder coating becomes chipped or damaged
Wet clothes or towels are regularly hung directly on the grille
If you frequently hang wet laundry or towels on your window grille, we would generally recommend:
Choose aluminium.
Aluminium does not rust and is much more forgiving in these conditions.
Why We Prefer Casement for Mild Steel Slim Grill
Mild steel is considerably heavier than aluminium.
Because of this additional weight, Ho Ho uses a casement opening system for our mild steel slim grilles rather than a sliding system.
A heavy sliding grille places more stress on the rollers and moving components over time.
For homeowners who specifically want a sliding window grille, aluminium is generally the more practical long-term choice.
4. Wrought Iron Window Grill
A wrought iron window grill is suitable for homeowners who want stronger security together with a more traditional or decorative appearance.
It is particularly suitable for:
Landed properties
Ground-floor homes
Corridor-facing windows
Security-sensitive areas
Homeowners who prefer decorative grille patterns
Advantages of Wrought Iron Window Grill
Heavy-duty construction
Strong physical security barrier
Classic appearance
Decorative design possibilities
Suitable for customised patterns
Our wrought iron window grill starts from approximately $30 psf, depending on the design and specifications.
Like mild steel, iron-based grilles require proper protective finishing and maintenance because corrosion can eventually occur.
Aluminium vs Mild Steel vs Wrought Iron Window Grill Comparision
Which is best?
It depends on what matters most to you.
Feature | Aluminium | Mild Steel Slim | Wrought Iron |
Starting Price | From $8 psf | From $28 psf | From $30 psf |
Rust Resistance | Excellent | Can eventually rust | Can eventually rust |
Front Appearance | Approx. 20mm | Approx. 6mm | Depends on design |
Security | Basic | Strong | Heavy-duty |
Maintenance | Very low | Moderate | Moderate |
Mechanism | Fix, Sliding | Fix, Casement | Fix, Casement |
Choose Aluminium Window Grill If:
You want something affordable, rust-resistant, low maintenance and practical for everyday HDB living.
Choose Mild Steel Slim Window Grill If:
You want very slim bars, a modern minimalist appearance and stronger security.
Choose Wrought Iron Window Grill If:
Security is a major priority or you prefer decorative grille designs.
The important point is that there is no single best window grill for everyone.
Choose according to how you actually use your home.
What About Invisible Window Grilles?
Invisible grilles have become popular because of their minimalist appearance.
They typically use thin tensioned cables instead of conventional rigid aluminium or steel bars.
When installed as a fixed invisible grille, they can provide a very clean and unobstructed appearance.
However:
Ho Ho does not sell invisible window grilles.
This is a deliberate decision based on the type of long-term window grille solutions we prefer to offer our customers.
There are several practical considerations homeowners should understand before choosing an invisible grille.
1. Sliding or Casement Invisible Grilles Require a Bulky Frame
The main attraction of an invisible grille is that it looks almost invisible.
This works particularly well when the grille is fixed.
However, if you want a sliding or casement invisible grille so that it can be opened for cleaning and window access, additional framing and opening mechanisms are required.
The overall frame can therefore become much bulkier.
In our opinion, this reduces some of the clean, minimal appearance that makes invisible grilles attractive in the first place.
2. Invisible Grille Cables Can Be Subjected to Movement and Pressure
Unlike rigid aluminium or steel bars, invisible grilles rely on tensioned cables.
If children repeatedly pull or push against them, or cats climb and play with them, the cables may be subjected to repeated pressure and may lose their original neat appearance over time.
For households with young children or active pets, we prefer a properly designed rigid window grille system.
3. Consider Long-Term Exposure to Singapore Weather
Invisible grille cables need a protective outer coatings that will deteriorate under:
Strong sunlight
Heat
UV exposure
Humidity
The condition and durability will depend on the material quality, manufacturer and installation environment.
We believe homeowners should consider how a grille will perform years later—not only how good it looks immediately after installation.
4. Fixed Invisible Grilles Can Make Window Cleaning Less Convenient
With a fixed invisible grille, the cables remain permanently across the window opening.
You therefore have to clean the windows through the gaps between the cables.
An openable invisible grille can improve access, but it requires the additional sliding or casement frame mentioned earlier.
By comparison, a sliding aluminium window grille can simply be unlocked and slid aside, providing easier access to the windows for cleaning.
Invisible Grille vs Aluminium Window Grille
Feature | Invisible Grille | Aluminium Window Grille |
Unobstructed View | Excellent when fixed | Bars are more visible |
Frame Appearance | Can be bulkier when openable | Conventional frame |
Window Cleaning | More difficult when fixed | Sliding panels provide easy access |
Barrier Type | Tensioned cables | Rigid aluminium bars |
Children/Pets | Cables may be subjected to pulling/climbing | Rigid construction |
Maintenance | Cable, coating and tension need consideration | Very low maintenance |
Available From Ho Ho | No | Yes – from $8 psf |
If you want a less visually obstructive conventional grille, consider our 6mm mild steel slim window grille instead.
Modern Window Grill Design Ideas
Window grilles do not have to make your home look old-fashioned.
Modern window grill designs generally focus on clean lines, simple colours and less visual obstruction.
Simple Horizontal or Vertical Grilles
Straight-line designs create a clean appearance and are easy to match with most renovation styles.
They are also generally more affordable than complicated decorative patterns.
Black Window Grilles
Black has become a popular choice for modern homes.
A black grille works particularly well with:
Black aluminium window frames
Industrial interiors
Minimalist homes
Dark-framed glass windows
White Window Grilles
White window grilles create a lighter appearance and can blend naturally with white window frames and bright interiors.
Slim Window Grille Designs
If maintaining the view is important, consider the thickness of the grille from the front view, not only the overall dimensions.
Our mild steel slim grille has an approximately 6mm front-facing profile, making it significantly less visually obstructive than a conventional aluminium grille.
Why Window Grilles Are Important for Child Safety
Open windows can pose a serious fall risk, particularly in high-rise homes.
For families with young children, a properly designed window grille creates an additional physical barrier between the child and an open window.
We generally recommend grille spacing of less than 5 inches for child safety.
However, a window grille should never replace proper supervision.
Parents should also avoid placing:
Beds
Chairs
Tables
Cabinets
Climbable furniture
directly beside open windows.
Window Grilles and Safe Window Cleaning
Window grilles are also important when windows need to be cleaned in high-rise homes.
Singapore’s Ministry of Manpower has highlighted the dangers associated with exterior window cleaning, particularly for Foreign Domestic Workers.
Where applicable under MOM's safety requirements, exterior window cleaning should be carried out with appropriate adult supervision, and window grilles must be installed and locked during cleaning.
This is another reason homeowners should think about the opening and locking mechanism of their window grille—not just its appearance.
A sliding aluminium grille, for example, provides easy access when appropriate for cleaning and can then be closed and securely locked.
Always follow the latest applicable MOM requirements for safe exterior window cleaning.
HDB Window Grill: Do You Need Approval?
This is an area where homeowners sometimes become confused.
Not every situation involving an existing HDB window grille should be treated exactly the same.
According to HDB renovation requirements, the installation or replacement of grilles at the service yard or balcony parapet is subject to renovation requirements.
For flats handed over from 1 July 2007 onwards, grilles installed at these locations must be of HDB-approved designs.
Homeowners should refer to the renovation factsheet provided during the booking or collection of keys and can check the specific renovation guidelines and approved grille designs applicable to their flat.
This is particularly important for BTO service yard grilles.
Do not simply choose any grille design based on appearance and fabricate it first.
Check the applicable requirements before ordering.
As an HDB-licensed contractor, Ho Ho can advise homeowners on the applicable requirements and assist with the necessary process where required.
Can I Remove My HDB Window Grill?
In many situations, an existing HDB window grille can be removed if it is not part of the structural barrier.
If you are removing an old grille because you intend to install a new one, it is usually more practical to coordinate the removal and replacement together.
You should also carefully consider safety before permanently removing a grille, especially if your household includes:
Young children
Elderly family members
Cats or other pets
If you are unsure whether your existing HDB grille can be removed or replaced, check with HDB before proceeding.
How Much Does a Window Grill Cost in Singapore in 2026?
Our starting prices are:
Aluminium Window Grille
From $8 psf
Cat-Proof Window Grille
From $12 psf
Mild Steel Slim Window Grille
From $28 psf
Wrought Iron Window Grille
From $30 psf
These are starting prices and should not be interpreted as a fixed whole-house package price.
The final quotation depends on several factors.
What Affects Window Grill Price?
1. Window Size
Larger windows require more materials.
Window grilles are commonly calculated according to the total square footage.
2. Total Quantity
Installing one small grille and installing grilles throughout an entire HDB flat will have different pricing considerations.
3. Material
Aluminium is significantly more affordable than mild steel slim or wrought iron.
4. Window Grill Design
Simple standard designs are generally more affordable than complicated decorative patterns.
5. Bar Spacing
Closer spacing requires additional materials.
This is why a cat-proof window grille may cost more than a standard aluminium grille.
6. Colour & Finishing
Standard anodized silver and bronze aluminium finishes are generally more economical.
Powder-coated black and white cost approximately $2 psf more for our aluminium grilles.
Customised colours can cost considerably more.
4-Room HDB Window Grill Price
One common question homeowners ask is:
“How much is the window grill for a 4-room HDB?”
There is no single accurate price for every 4-room flat.
This is because different HDB developments can have different:
Window sizes
Number of windows
Service yard configurations
Existing grille conditions
Grille designs
Material requirements
However, a good estimate will for 4 room HDB window grille - Approximately $900 for HDB BTO. $1500 for HDB resale flat.
The easiest way to get an accurate 4-room HDB window grill price is to send us your floor plan, window measurements or photos.
We can then calculate based on your actual requirements instead of giving you an unrealistic package price that may change later.
Window Grill Installation Process
At Ho Ho, the typical process is straightforward.
Step 1 – Send Us Your Requirements
Send us:
Your floor plan
Approximate window measurements, or
Photos of your existing windows
Tell us which type of grille you are interested in.
If you are unsure, we can advise.
Step 2 – Choose Your Window Grille
Choose between:
Aluminium
Cat-proof aluminium
Mild steel slim
Wrought iron
Then select your preferred colour and design.
Step 3 – On-Site Measurement
Our team will take the actual measurements before fabrication.
Step 4 – Fabrication
Standard window grilles generally require approximately 1–2 weeks for fabrication, depending on the project and design.
Step 5 – Installation
Most standard HDB window grille installations can be completed within a few hours, depending on the quantity and complexity of the work.
Can I Replace My Window Grille Without Replacing My Windows?
Yes.
If your existing windows are still in good working condition, you may be able to replace only the window grilles.
You do not necessarily have to replace the entire window system.
Similarly, if you are already planning to replace your windows, you may consider replacing the windows and grilles together so that:
Colours match
Designs coordinate
Measurement is easier
The finished appearance is more consistent
How to Clean Window Grills
The best cleaning method depends on the material.
How to Clean Aluminium Window Grilles
Aluminium grilles are relatively easy to maintain.
Use:
A soft cloth
Water
Mild household detergent
For narrow gaps, use a small brush or microfiber duster.
Avoid highly abrasive cleaning products that may scratch or damage the surface finish.
How to Clean Mild Steel or Wrought Iron Grilles
Use a damp cloth with mild detergent and dry the grille properly after cleaning.
Pay particular attention to areas where the powder coating has been scratched or chipped.
If the protective coating is damaged, the exposed metal may become more susceptible to corrosion. Hence, it is adisable for owner to touch up the paint work if you find the coating is damaged.
How to Clean Windows With an Invisible Grille
With a fixed invisible grille, the cables remain permanently across the window opening.
This means you generally have to clean the glass through the spaces between the cables.
This can make certain areas more difficult to reach.
You should never lean your body outside a high-rise window or attempt to reach difficult exterior areas unsafely.
If easy window-cleaning access is important to you, think about this before choosing your grille system.
A sliding aluminium grille can be opened to provide easier access, whereas a fixed invisible grille remains across the opening.
Which Window Grill Lasts the Longest in Singapore?
If by “lasting” you mean requiring the least maintenance, aluminium has a major advantage:
Aluminium window grill does not rust.
Mild steel and wrought iron window grill can also last many years when properly finished and maintained, but they are more vulnerable to corrosion.
The installation environment makes a big difference.
A window grill inside a sheltered bedroom experiences very different conditions from one exposed to:
Direct rain
Strong sunlight
Sea air
Constant humidity
Wet clothes and towels
This is why you should not choose a window grille based purely on appearance.
Think about where it will actually be installed and how you will use it for the next 10–20 years.
Frequently Asked Questions About Window Grilles in Singapore
Which Window Grill Is Best for HDB?
For most HDB homeowners looking for an affordable and low-maintenance solution, aluminium window grilles are usually the most practical choice.
If you prioritise a slim, modern appearance, consider mild steel slim.
If maximum security or decorative designs are more important, consider wrought iron.
Does Aluminium Window Grill Rust?
No. Aluminium does not rust in the same way as iron or mild steel.
This makes aluminium particularly practical for Singapore’s humid environment.
Is Mild Steel Window Grill Better Than Aluminium?
Neither is automatically better.
It depends on your priorities.
Mild steel slim grille:
Slimmer, stronger and more minimalist.
Aluminium grille:
Cheaper, lighter, does not rust and requires less maintenance.
What Is the Difference Between a 6mm Mild Steel Grille and Aluminium Grille?
Our mild steel slim grille has an approximately 6mm front-facing profile, creating a much less obstructed appearance.
A typical aluminium grille has an approximately 20mm front-facing profile.
Aluminium is more visible, but it is significantly more affordable, lightweight and does not rust.
Is Aluminium Window Grille Strong Enough for Security?
An aluminium grille provides a physical barrier and is suitable for general household safety.
However, if security against forced entry is your main concern, we would generally recommend considering mild steel or wrought iron, which provide a stronger construction.
What Is the Best Modern Window Grill Design?
Simple straight-line designs, black grilles and slim-profile grilles are popular choices for modern Singapore homes.
For homeowners who want less visual obstruction, our 6mm mild steel slim window grille provides a minimalist conventional grille option.
Can I Install a Cat-Proof Window Grill?
Yes.
Our cat-proof aluminium window grilles start from approximately $12 psf and use closer spacing.
We generally recommend gaps of less than 2 inches, depending on the cat and window configuration.
Can I Mix Different Window Grille Types in the Same HDB Flat?
Yes.
For example, some homeowners may choose mild steel or wrought iron for corridor-facing windows where security is more important, while using aluminium grilles for bedrooms or non-corridor-facing windows to balance cost, maintenance and security.
Does Ho Ho Sell Invisible Window Grilles?
No.
We focus on:
Aluminium window grilles
Cat-proof aluminium window grilles
Mild steel slim window grilles
Wrought iron window grilles
We prefer rigid grille systems that we believe offer a practical balance between durability, safety, maintenance and everyday usability.
For homeowners who like a minimalist appearance, our 6mm mild steel slim grille is an alternative to consider.
Why HDB Homeowners Choose Ho Ho for Window Grilles
Ho Ho Engineering & Renovation Works has been serving Singapore homeowners since 1976.
That means 2026 marks our 50th year.
One important advantage of buying from us is that we do not offer only one type of window grille.
We manufacture and supply:
Aluminium Window Grilles
Cat-Proof Window Grilles
Mild Steel Slim Window Grilles
Wrought Iron Window Grilles
Because we have different materials available, we can recommend an option based on your actual requirements rather than simply selling whichever grille type we happen to carry.
Why Choose Ho Ho?
Established Since 1976
50 years serving Singapore homeowners.
HDB-Licensed Contractor
Experienced with HDB window and grille requirements.
BCA Registered
Established local contractor.
Direct Manufacturer
Direct fabrication without unnecessary middlemen.
Multiple Window Grille Options
Compare aluminium, mild steel and wrought iron before deciding.
Physical Showroom
See and compare the actual materials, thicknesses, colours and designs before placing your order.
Get a Window Grill Quote in Singapore
Still not sure whether you should choose aluminium, cat-proof aluminium, mild steel slim or wrought iron window grilles?
You do not need to measure everything perfectly before contacting us.
Simply send us:
Your floor plan, window dimensions or photos
Tell us which grille you are interested in—or ask us to recommend
We will provide a quotation based on your requirements
Ho Ho Engineering & Renovation Works
Established Since 1976 | 50 Years in Singapore
HDB Licensed | BCA Registered | Direct Manufacturer
Call: 6747 9019
WhatsApp: 9631 9288
Showroom: 194 Pandan Loop #07-07, Singapore 128383
Opening Hours: Mon–Fri 10am–4.30pm | Sat 10am–2pm
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