Water Seeping Through Windows When Raining in Singapore?
Water seeping through windows when raining in Singapore refers to the unwelcome entry of rainwater into your home via gaps, cracks, or compromised seals around window frames, glass panes, or even through adjacent walls. This common issue, often worsened by Singapore’s heavy rainfall and humid climate, can stem from worn-out weather stripping, faulty window installations, or cracks in the external building façade. Addressing this promptly with professional window and wall waterproofing is crucial to prevent structural damage, mould growth, and maintain a healthy indoor environment. Atlasworks specialises in diagnosing and resolving these exact problems for all types of residential properties across Singapore.
The sound of rain in Singapore is usually comforting, but for many homeowners, it can bring a wave of anxiety. A tell-tale sign of trouble is when you spot damp patches around your windows, peeling paint on your window frames, or even puddles on your floor after a downpour. This issue, known as water seepage, is more than just a minor inconvenience; it’s a clear indicator that your home’s defences against the elements are failing.
At Atlasworks, we understand the specific challenges Singaporean homes face with heavy monsoon seasons and persistent humidity. We are dedicated to providing expert window and wall waterproofing services, ensuring your home remains a dry, comfortable sanctuary, even during the heaviest storms.
Why Does Water Seep Through Your Windows in Singapore?
Water seeping through windows in Singapore can be a puzzling problem, as the source isn’t always obvious. However, it typically stems from a few common culprits, often worsened by local conditions and certain installation practices.
1. Worn-Out Seals and Gaps in Window Frames
Over time, the sealant (often silicone or rubber) around your window frames degrades due to constant exposure to sun, rain, and humidity. These materials can crack, shrink, or detach, creating tiny pathways for water to sneak through. This is a very common issue in older HDB flats and condominiums where original seals may have aged significantly.

2. Faulty Window or Grille Installations
This is a significant pain point for many homeowners, especially those in BTOs and other new residential developments who have recently installed windows or window grilles.
- Improper Sealing: Sometimes, during the initial installation of new windows or the retrofitting of window grilles (which often requires minor drilling into the window frame or wall), the waterproofing seal isn’t applied correctly or thoroughly. This leaves minute gaps that aren’t immediately visible but become entry points for water during heavy rain.
- Drilling Issues: When window grilles are installed, new holes are drilled into the existing window frame or wall. If these drill points are not properly sealed afterwards, water can penetrate through them, leading to internal seepage.
- Poor Workmanship: Sadly, shortcuts or a lack of attention to detail during installation can leave critical areas vulnerable. Even a seemingly minor error can lead to significant water ingress during heavy downpours. We’ve seen numerous cases where homeowners experience water seepage shortly after new windows or grilles are fitted, pointing directly to these installation-related issues.
3. Cracks in External Walls or Facade
Water seepage isn’t always just about the window itself. Rainwater can also find its way into your home through hairline cracks or larger fissures in the external walls adjacent to your windows. This is particularly relevant for landed properties but can also affect HDBs and condominiums with ageing external finishes. Once water gets behind the wall surface, it can travel along the structure and emerge around the window frame, making it appear as if the window is the primary leak source.

4. Blocked or Damaged Window Tracks
For sliding windows, the tracks are designed to drain away any water that collects. Clogged or damaged tracks can cause water to overflow and seep into your home.
The Consequences: Why Timely Window & Wall Waterproofing is Crucial
Ignoring water seepage from your windows or walls can lead to a cascade of problems that are much more serious than a mere wet patch.
- Structural Damage: Continuous water exposure can weaken building materials like plaster, concrete, and even the steel reinforcement within walls. This can lead to spalling concrete (concrete cancer) in HDBs and condos, or compromised structural integrity in any property type over time.
- Mould and Mildew Growth: Damp, dark areas behind walls and under window frames are perfect breeding grounds for mould and mildew. These fungi are unsightly, smell musty, and can cause respiratory issues, allergies, and other health problems for your family.
- Damage to Interiors: Water seepage will inevitably ruin your interior finishes. This includes peeling paint, bubbling wallpaper, stained ceilings, warped flooring (especially parquet or laminate), and damaged furniture near the windows.
- Increased Repair Costs: What starts as a small leak can quickly escalate. Fixing the secondary damage (repainting, replacing flooring, treating mould) often costs far more than addressing the initial waterproofing issue.
- Pest Infestations: Damp environments can attract pests like cockroaches and termites, adding another layer of headache for homeowners.
- Reduced Property Value: Unrepaired water damage can significantly reduce your property’s appeal and market value, making it harder to sell or rent in the future.
Atlasworks’ Solution: Comprehensive Window & Wall Waterproofing for Singapore Homes
At Atlasworks, we offer a holistic approach to tackling water seepage through windows and walls. Our expertise guarantees lasting solutions, regardless of the problem’s complexity or property type.
Atlas Works Pte Ltd | Waterproofing & Painting Services Singapore | Residential & Commercial 141 Google reviews Daphne L2025-07-11Trustindex verifies that the original source of the review is Google. I engaged Atlasworks to carry out waterproofing and grouting works on my bathroom flooring and was pleased with the experience from start to finish. Eric was responsive during the initial consultation and provided a detailed scope of work. The worker assigned to the job was punctual, efficient, and knowledgeable. He patiently explained each step of the process and took care to keep the workspace clean. Upon completion, I received a waterproofing report with clear descriptions of the work done, accompanied by photos. The warranty provided gave me added peace of mind. Overall, I’m satisfied with the quality of work and professionalism shown by Eric and his team at Atlasworks. Gillian Kan2025-07-08Trustindex verifies that the original source of the review is Google. Contacted Atlas and subsequently liaised with Eric for waterproofing of my 2 bathrooms. They did a really good job and were very neat and the grouting was very even. Also, Eric was very helpful and patiently answered all my queries in a timely manner. Kudos to the team at Atlas! Jessica Knight2025-06-24Trustindex verifies that the original source of the review is Google. We recently got Atlas Works Pte Ltd to do some extensive waterproofing and painting work at our house encompassing significant scaffolding, waterproofing, painting and maintaining of a weathered facade. Our main contact at Atlas was Mr Eric The work that they did for us is of a very high quality. The project was delivered on time to a high standard. Eric and the workers responded on a timely basis and were always professional around how they conducted themselves and in their work The scope of work increased as we were happy with the initial interactions and the quotation process was transparent and efficient. I have full confidence if we have any trouble during the warranty period that Atlas will rectify in a timely, efficient and complete manner. We highly recommend the team at Atlas for your painting and waterproofing works. Alex Chan2025-06-23Trustindex verifies that the original source of the review is Google. Very prompt service. Workers were careful and protected my floor, staircase and work area. Very happy with their work and service. Replies promptly with your messages and any concerns you have. Teck Mo Wong2025-06-20Trustindex verifies that the original source of the review is Google. Professional, respond fast, reasonable price. The guys who can to do waterproofing was polite, knowledgeable and keep very clean after work done. Yang Di2025-06-04Trustindex verifies that the original source of the review is Google. Professional job. Friendly and competent workers. Highly recommend to everyone who needs waterproof job. Khirman Kasim2025-06-03Trustindex verifies that the original source of the review is Google. Very timely response from Eric on queries even on weekends and night...Good service from the Atlas team especially from Mahmood Chong kai Lee2025-06-02Trustindex verifies that the original source of the review is Google. Recently hired Atlas Work for painting services for my apartment, and I couldn't be happier with the results. The quality of the work was top-notch and professional. What I understand is they also provide waterproofing works. Highly recommend to everyone! Esther Tang2025-05-30Trustindex verifies that the original source of the review is Google. Altas works is so efficient. Eric is so helpful and professional in answering all my questions about ceiling leakage issues. Both my toilet ceilings are as good as new. The workers manage to complete the work within 7 hours.
1. Advanced Leak Detection: Finding the Source with Precision
The first and most critical step is accurately identifying the source of the leak. Often, the entry point of water is not where the dampness appears.
- Non-Invasive Techniques: We utilise advanced diagnostic tools such as thermal imaging cameras, moisture meters, and targeted water testing to pinpoint the exact entry points of water. This minimises unnecessary hacking or damage to your property.
- Expert Diagnosis: Our skilled technicians have extensive experience with the unique construction of HDB flats, condominiums, and landed properties in Singapore. They can accurately identify if the issue is due to a faulty window seal, poor grille installation, hairline cracks in the wall, or blocked drainage.
2. Comprehensive Window Waterproofing Solutions
Once the source is identified, Atlasworks implements targeted repairs to seal your windows against future leaks.
- Seal Replacement & Re-siliconing: For worn-out seals, we remove the old sealant and apply high-quality, weather-resistant silicone. This creates a robust, watertight barrier around the window frame and glass panes.
- Addressing Installation Flaws: If water seepage relates to prior window or grille installation, we will re-seal all drill points and ensure the frame is properly integrated and sealed against the wall. We understand the specific vulnerabilities created by post-handover installations.
- Track Clearing & Repair: For sliding windows, we thoroughly clear and repair any blocked or damaged drainage tracks, ensuring water can effectively escape.
3. Robust Wall Waterproofing Treatments
For leaks originating from or travelling through external walls, Atlasworks provides effective water seeping or wall waterproofing solutions.
- Protective Coatings and Membranes: We apply specialised waterproof coatings or liquid-applied membranes to the external wall surfaces. These materials create an impermeable barrier that prevents rainwater absorption and penetration, even through hairline cracks.
- Crack Repair: Any existing cracks in the external facade are meticulously repaired and sealed before the waterproofing treatment is applied, ensuring a complete and durable solution.
- Tailored for All Homes: Our solutions are tailored to the building materials and common issues of HDB blocks, condominium towers, and landed houses, offering effective long-term protection.

Why Choose Atlasworks for Your Window & Wall Waterproofing Needs?
Choosing Atlasworks means opting for reliability, expertise, and lasting peace of mind.
- Local Specialists: We possess deep knowledge of Singapore’s climate, building codes, and common waterproofing issues in HDB, Condo, and Landed homes, including unique scenarios like post-BTO grille installations.
- Advanced Techniques: We invest in the latest leak detection and waterproofing technologies to provide precise and non-invasive solutions.
- Experienced Team: Our technicians are highly trained, certified, and possess years of practical experience in diagnosing and resolving even the most challenging water seepage problems.
- Durable Solutions: We use only high-quality, industry-approved materials and proven methodologies to ensure our repairs are effective and stand the test of Singapore’s weather.
- Customer-Centric Service: We prioritise clear communication, transparent pricing, and efficient service delivery, aiming for your complete satisfaction.
Protect Your Home: Choose Atlasworks for Lasting Waterproofing
Don’t let water seepage from your windows or walls compromise your home’s integrity and your family’s comfort. The persistent dampness, potential for mould, and risk of structural damage demand professional attention.
If you are experiencing water seeping through your windows when it rains, or suspect wall leaks in your HDB flat, condominium, or landed property in Singapore, don’t wait for the problem to escalate. Contact Atlasworks today for a thorough inspection and reliable window and wall waterproofing solutions. Let us secure your home against the rain, ensuring a dry, healthy, and worry-free living environment.
