The Ultimate Guide to HDB Toilet Windows in Singapore (2026)

Toilet windows play a crucial role in ventilation, safety, privacy, and moisture control—especially in Singapore’s hot and humid climate. Yet, many homeowners only think about their toilet window when problems such as leaks, rust, or mould start appearing.

This ultimate guide explains everything HDB homeowners need to know about toilet windows in Singapore, including types, sizes, prices, HDB permit requirements, exhaust fan options, and the best time to replace them.

Types of Toilet Windows Used in HDB Flats

Most HDB flats use one of the following toilet window configurations. Choosing the right type depends on your ventilation needs, budget, and maintenance preference.

Top Hung Toilet Window

A top hung toilet window opens outward from the top. It is increasingly popular in newer HDB flats and renovations.

Benefits Of Top Hung Toilet Window

• Better rain protection

• Sleeker, more modern appearance

• Easier to clean

• Fewer gaps, better sealing

This is the preferred choice for homeowners looking for a low-maintenance and modern toilet window solution.

Adjustable Louvre Toilet Window

Adjustable louvre windows use angled glass panels that can be tilted to control airflow.

Benefits Of Adjustable Louvre Toilet Window

• Adjustable ventilation

• More airflow

Considerations Of Adjustable Louvre Toilet Window

• More joints to clean

• Less effective rain protection

• Traditional appearance

Toilet Window with Exhaust Fan

A toilet window can also be combined with an exhaust fan for improved airflow.

This setup is highly recommended for:

• Toilets prone to dampness

• Toilets with weak natural airflow

• Homes facing frequent mould issues

In Singapore’s humid environment, an exhaust fan helps remove moisture, odours, and stale air more effectively.

Top Hung Window vs Adjustable Louvre Toilet Window

Both options are HDB-approved, but they serve different homeowner needs.

If you prioritise ease of maintenance and durability, top hung windows are usually the better choice. If you prioritise better ventilation, adjustable louvre toilet windows are usually the better choice

HDB Toilet Window Replacement – What Homeowners Must Know

All HDB toilet window replacement works require an HDB permit.

Homeowners should engage an HDB-licensed contractor who will apply for the permit on their behalf. This ensures the installation complies fully with HDB regulations.

Exhaust Fan Installation Requires a Different Types of HDB Permit

If you plan to install an exhaust fan:

• You must inform the contractor in advance

• The glass panel needs to be cut

• A different HDB permit is required

• Additional charges apply for glass cutting and installation

KDK Exhaust Fan for Toilet Windows in Singapore

When it comes to toilet ventilation in Singapore, KDK exhaust fans are one of the most trusted and commonly used options for HDB homes. Known for their reliability, quiet operation, and long lifespan, KDK fans are well-suited for Singapore’s hot and humid climate.

Why Many Homeowners Choose KDK Exhaust Fans

• Quiet operation: Suitable for daily use without excessive noise.

• Effective moisture removal: Helps reduce condensation and dampness, lowering the risk of mould and mildew.

• Reliable performance: Built for long-term use with stable airflow.

  
  

Popular KDK Exhaust Fan Models for Toilet Windows

Commonly used models for toilet window installation include:

• KDK 15WUD – suitable for small to standard HDB toilets

• KDK 15WHPCT – comes with a humidity sensor that activates automatically when moisture levels rise

• KDK 20WUD – stronger airflow for larger or poorly ventilated toilets

The appropriate model depends on toilet size, ventilation condition, and usage frequency. The best place to buy KDK exhaust fan is on Shopee because you get best pricing and free delivery.

Important Things to Note Before Installing a KDK Exhaust Fan

• Installing an exhaust fan on a toilet window requires advance planning

• The window glass panel must be cut to fit the exhaust fan

• A different HDB permit is required when an exhaust fan is included

• Additional charges apply for glass cutting and installation

• Exhaust fan cost is usually not included

For better pricing and flexibility, homeowners are generally encouraged to purchase the exhaust fan themselves, while the contractor handles the window preparation and installation.

Wire Mesh Glass vs Frosted Laminated Glass for Toilet Windows

When replacing an HDB toilet window, homeowners can choose between wire mesh glass and frosted laminated glass. Both options are commonly used in Singapore and are suitable for toilet windows, but they differ in appearance, safety features, and overall finish.

Wire Mesh Glass For Toilet Window (Standard Option)

Wire mesh glass is the default glass type for HDB toilet windows. It has a metal wire embedded within the glass, creating a grid pattern.

Key characteristics of wire mesh glass toilet window

• Included by default

• Provides basic privacy

• Allows light to pass through

• Traditional appearance commonly seen in older HDB flats

Things to note of wire mesh glass toilet window

• The wire grid is clearly visible

• More utilitarian in look

• Less visually refined compared to laminated glass

Wire mesh glass remains a practical and cost-effective choice, especially for homeowners who prioritise function over aesthetics.

Frosted Laminated Glass For Toilet Window (Upgrade Option)

Frosted laminated glass consists of two layers of glass bonded together with a laminated interlayer and finished with a frosted surface.

Key characteristics of frosted laminated glass toilet window

• Cleaner and more modern appearance

• Better privacy without visible wire lines

• Improved safety due to laminated construction

• Softer, more even light diffusion

Additional cost of frosted laminated glass toilet window

• Frosted laminated glass is available at an additional $80 per panel

This option is popular among homeowners who are renovating their toilets or prefer a more refined, contemporary look.

Which Glass Should You Choose For Your Toilet Window?

• Choose wire mesh glass if you want a budget-friendly, standard HDB option that gets the job done.

• Choose frosted laminated glass if you want a better-looking, safer, and more modern finish, especially during a full toilet renovation.

Both glass options provide privacy and are suitable for HDB toilet windows. The right choice depends on your budget, renovation plans, and visual preference

When Is the Best Time to Change Your HDB Toilet Window?

The best time to change your toilet window is when it no longer provides proper ventilation, safety, or privacy.

Replace your toilet window if:

• The window frame is loose or hard to operate

• Glass is cracked or damaged

• Water seeps in during heavy rain

• The window no longer meets current HDB safety standards

• You are renovating your toilet and want a modern upgrade

During Toilet Renovation Works (Best Timing)

The ideal time to replace an HDB toilet window is during a toilet renovation. This allows proper alignment with new tiles and avoids unnecessary hacking or rework later.

For Older HDB Flats (Important Note)

If you are not changing your toilet tiles, removing the existing window frame may cause tiles to crack. In such cases, we recommend installing a new window frame within the existing frame.While this results in two frames, it avoids tile damage—which often looks worse and costs more to repair.

HDB Toilet Window Size Guide

HDB toilet window pricing is not based on square footage, because most HDB flats follow standard window sizes.

Standard HDB Toilet Window Sizes

• 1 panel: up to 2 ft × 2 ft(approximately 60 cm × 60 cm)

• 2 panels: up to 4 ft (width) × 2 ft (height) (approximately 120 cm × 60 cm)

Private Properties Toilet Window Sizes

Toilet windows in private properties may be larger or customised, which results in higher pricing.

HDB Toilet Window Price Guide

HDB toilet window pricing depends on:

• Number of panels

• Glass type selected

• Whether the toilet window is replaced alone or together with other windows

Standard Glass Options For Toilet Window

• Wire mesh glass – included by default

• Frosted laminated glass – additional $80 per panel for a cleaner, more modern look

Standard HDB Toilet Window Pricing

• 1 panel + 1 panel – $390

• 1 panel + 2 panels – $490

• 2 panels + 2 panels – $590

Additional Costs

• Exhaust fan cutting: +$100

• Replacing toilet window only: +$100 (due to min sum)

• Exhaust fan price not included (homeowners are encouraged to purchase their own for better pricing)

Toilet Window with Exhaust Fan – Is It Necessary in Singapore?

Due to Singapore’s high humidity, many homeowners experience:

• Persistent dampness

• Mould growth

A toilet exhaust fan significantly improves air circulation and helps keep toilets dry and hygienic. It is especially useful for toilets with limited airflow or internal layouts.

What If My Toilet Has No Window?

Some HDB flats have internal toilets with no windows.

In such cases:

• An exhaust fan is essential

• Proper airflow planning is critical

• Moisture control becomes even more important

Installing a reliable exhaust fan helps prevent long-term mould and odour issues.

Changing Your Toilet Window Together with Other Glass Windows

Many homeowners choose to replace their toilet window together with other glass windows in the home.

Benefits include:

• Better cost efficiency

• Coordinated installation schedule

• Avoiding the additional charge for toilet-only replacement

Why Choose Ho Ho for HDB Toilet Window Replacement

Established since 1976, Ho Ho specialises in supplying and installing glass windows in Singapore at direct factory prices.

• HDB-licensed contractor (HB-02-0677D)

• BCA-registered contractor

• Over 50 years of experience

• Thousands of homeowners served

• Fully HDB-compliant installations

Our glass window solutions are designed to improve ventilation, safety, and long-term durability for Singapore homes. Click here to find out more about our toilet window offering in Singapore!

Common Questions About HDB Toilet Windows

Is wire mesh glass compulsory? Wire mesh glass is the standard option for HDB toilet windows.

Can I install an exhaust fan later? Yes, but it requires glass cutting and may not look as nice.

How long does installation take? Toilet window replacements takes 1 hours per set.

Final Tip About HDB Toilet Window Replacement In Singapore?

For the cleanest finish, best value, and least disruption, the best time to change your HDB toilet window is during a full toilet renovation or together with other glass window replacements. Call us 67479019 or whatapps us 96319288 today for more information and pricing.