Best Reviewed Window Contractors in Singapore
Selecting the best window contractor in Singapore is more than comparing quotations. There are various considerations such as the quality of the windows, installation process, materials used, warranties offered, after-sales services, and even customer experience that can influence the value and functionality of your investment, especially when replacing HDB windows, installing window grilles or installing windows to improve your property.
Many contractors in Singapore provide aluminium windows, grilles, doors, and installation services. However, each contractor may offer a different range of products, prices, and customer experience you should consider before requesting a quotation. In this article, we compare some of the best window contractors in Singapore.
Best Window Contractors in Singapore at a Glance
The following contractors are worth considering for comparing window installation and aluminium services in Singapore.
Ratings and number of reviews should be treated as a snapshot since they can change over time. 9 Power has been approved by the Singapore Building and Construction Authority as a window contractor under RW01, and others listed below have similar services.
| Contractor | Main offerings | Google rating* | Pricing |
| 9 Power Aluminium & Glass Pte. Ltd. | Aluminium windows, window grilles, gates, awnings | Check current profile | Quote-based |
| WSS Windows & Doors Pte Ltd | Aluminium windows, doors, grilles and related products | 4.3/5 (80 reviews) | Online estimate available |
| M Aluminium & Glass Pte Ltd | Aluminium windows, grilles and glass solutions | 4.8/5 (917 reviews) | Published package prices available |
| AT Aluminium | Aluminium windows, grilles, doors and gates | Verify before publication | Published price guides available |
| Top 1 Singapore Safety Window | Aluminium windows, grilles, invisible grilles, doors and gates | 5.0/5 (22 reviews) | Published grille prices available |
*Google ratings and review counts should be checked again on the final date of writing and supported with screenshots.
1. 9 Power Aluminium & Glass Pte. Ltd.
9 Power Aluminium & Glass Pte. Ltd. is a window contractor in Singapore that provides customised aluminium windows, window grilles, gates, and awnings. The Building and Construction Authority of Singapore registered the company under RW01 – Window Contractors, and it serves residential projects such as HDB projects. It has completed over 500 projects and offers a 10-year warranty on its products.
The window offerings include casement, sliding, hung, HDB, and soundproof windows, while the grilles offered by this company are aluminium and cat-proof grilles. 9 Power also provides aluminium gates, mild steel gates, slide and swing doors, and awnings.
Pricing
9 Power does not present one fixed price for each window installation provided because prices vary depending on elements such as size, window layout, material used, type of glass, and installation needs. Homeowners should therefore request a project-specific quotation rather than comparing a single advertised figure.
Why consider 9 Power? Its combination of custom aluminium windows, grilles, gates and awnings, along with its stated BCA registration and 10-year structural warranty, makes it a strong starting point for homeowners comparing window contractors in Singapore.
2. WSS Windows & Doors Pte Ltd
WSS Windows & Doors Pte Ltd is a Singapore-based company that manufactures and installs aluminium and stainless steel windows, doors, invisible grilles, and other home products. Founded in 1981, WSS has its own manufacturing plant in Singapore and its own installation team. WSS produces aluminium casement, sliding, louvre, and flexi windows.
Pricing
WSS has an estimated pricing calculator where customers can select their desired products, sizes, and quantities to view a possible price range. However, the final quotation is determined by the project specifications.
Why consider WSS? With its extensive experience, in-house production, product range, and factory-direct model, WSS offers a strong comparison against well-established companies in Singapore.
3. M Aluminium & Glass Pte Ltd
M Aluminium & Glass Pte Ltd provides aluminium and glass solutions for housing, comprising windows, window grilles, glass doors, shower screens, and kitchen back panes.
Pricing
The price range for selected window grille systems from M Aluminium & Glass includes:
- Their half-height aluminium window grille starts at S$600 for 3-room, S$700 for 4-room, and S$800 for 5-room HDB units.
- Their full-height window grilles have a starting price of S$750, S$850, and S$950, respectively.
M Aluminium & Glass provides a complete suite of services from aluminium fabrication and glass products to window grilles, making it a good choice for homeowners who want several related works handled by one contractor.
4. AT Aluminium
AT Aluminium supplies aluminium windows and grilles for homes and offices in Singapore. Its range includes sliding, casement, top-hung, and louvre windows. Other products include aluminium doors, grilles and gates. The company also offers on-site measurement and installation services.
Pricing
AT Aluminium publishes indicative 2026 prices, with standard installed sliding windows priced at approximately S$280-S$500 per window, and standard casement windows at S$400-S$700. A full replacement of 4-room HDB windows is priced at approximately S$3,000-S$8,000.
The company also offers a 10-year warranty on its windows, doors and gates.
Why consider AT Aluminium? Its wide price range makes it easier to create an initial budget. At the same time, its range of windows and aluminium products offers options for residential projects.
5. Top 1 Singapore Safety Window
Another choice when comparing window and grille contractors is Top 1 Singapore Safety Window. The company specialises in aluminium and invisible window grilles.
Pricing
Top 1’s 2026 price list includes aluminium window grille promotions starting from S$599 for 3-room HDB flats, S$899 for 4-room flats, and S$1,299 for 5-room flats. The company adds that grille prices depend on factors like grille type, flat size, measurements, and installation needs.
Why Choose Top 1 Singapore Safety Window? The company offers premium window and grille installation services and is a BCA-approved window contractor.
How Much Does a Window Contractor Cost in Singapore?
Hiring window contractors in Singapore doesn’t have a single price tag. Prices depend on the window type, size, frame materials, glass quality, number of panels, the building type, and any extra work like grilles.
The current 2026 market data offers a good reference point for homeowners. You can expect aluminium sliding window replacements to cost around S$200 to S$900, and casement windows around S$400 to S$700. The actual prices depend on the project scope.
What Affects Window Installation Cost?
Several factors can change the final quotation:
- Window type: Sliding, casement, top-hung and fixed windows require different hardware and configurations.
- Size and number of panels: Larger openings and additional panels generally require more materials and labour.
- Glass specification: Clear glass is usually more economical than laminated, tinted, acoustic or double-glazed options.
- Frame finish: Standard powder-coated finishes may cost less than customised finishes.
- Window grilles: Adding aluminium or invisible grilles increases the total project cost.
- Installation conditions: Access, removal of existing windows and other site requirements can affect labour charges.
For this reason, a professional site measurement is more useful than relying on a generic online price.
How to Choose the Best Window Contractor in Singapore
The best window contractor depends on your property, budget, and requirements. Before selecting a contractor, compare more than the headline quotation.
First, ensure that the contractor is properly licensed for the job, especially for HDB window replacement. A licensed window contractor must carry out HDB window replacement and follow the correct renovation procedure.
Second, compare the actual specifications included in each quotation. Compare the aluminium profile, glass type, opening mechanism, hardware, grille design, and the installation and removal process. You can’t compare two quotations with different specifications based only on their prices.
Finally, review current customer feedback and warranty terms. A high Google rating can be useful, but the number of reviews and the substance of recent feedback also matter.
What Should You Ask a Window Contractor Before Hiring?
Before confirming an order, ask:
- What window and glass specifications are included in the quotation?
- Does the price include measurement, installation and removal of existing windows?
- Is the contractor licensed for the type of HDB window work required?
- What warranty applies to the frame, glass, hardware and workmanship?
- How long will fabrication and installation take?
- Are there additional charges for customised colours, glass or grille designs?
Getting these details in writing makes it easier to compare quotations and reduces the risk of unexpected costs later.
Aluminium Windows vs Window Grilles: What Do You Need?
Windows and grilles have different functions in a building; therefore, homeowners should not treat them as interchangeable products. Windows offer ventilation, glazing, and weather protection, while grilles provide safety and security.
Aluminium windows, for instance, may be designed to slide, casement, or top-hung, depending on the space available and its location. Grilles can then be added as sliding, fixed, or swinging, where applicable.
If safety, children, and pets are a concern, consult your contractor about grille spacing and the opening system. However, if ventilation and sound control are a concern, focus more on the window opening system and glazing.
Frequently Asked Questions
How much does a window contractor cost in Singapore?
It depends on the window type, size, glass material, specifications, and installation needs. You can expect the cost of window replacement and installation to range between S$400 and S$1,200.
How much do window grilles cost in Singapore?
The costs of window grilles depend on the materials used, size, design, and type of house. For example, window grilles for one room can range from S$120 to S$400, whereas a full-flat window replacement can cost anywhere between S$400 and S$2,200.
How do I find the best window contractor in Singapore?
Choose a window installation company based on its license, product specifications, installation process, cost, warranty, and customer reviews. For HDB window replacements, the company must comply with all HDB and BCA regulations.
Should I choose a contractor based only on Google reviews?
No. Google reviews provide useful insight into customer experiences, but consider them alongside the number of reviews, product specifications, price, warranty, installation standards, and the contractor’s suitability for your project.
Are aluminium windows suitable for Singapore’s climate?
Yes, aluminium windows are commonly used in Singapore because of their light weight and corrosion resistance. However, factors like profile quality, coating, glazing material, sealing, and installation matter even more, especially in Singapore’s humid, rainy weather.
How should I compare window contractor quotations?
Ask each contractor to provide a quotation based on the same criteria, such as window type, size, glass, frame coating, hardware, grilles, and installation.
Final Thoughts
Finding the right window contractor in Singapore isn’t as simple as choosing the cheapest quote or the one with the highest Google rating. Instead, the process involves analysing the package, such as product quality, installation needs, costs, licenses, warranty, and customer experience.
9 Power Aluminium & Glass Pte. Ltd. offers a wide variety of aluminium products, such as windows, grilles, gates, and awnings. In contrast, the other contractors featured in this article offer a different range of windows, grilles, doors, and associated services. Comparing specifications and quotations will help you choose the option that best suits your needs.
Before making a final decision, confirm the contractor’s current license, check any recent customer reviews, and get a clear explanation of what your quotation includes.