Casatino is our top pick for the best window suppliers in Singapore because it fabricates aluminium window systems locally and covers the HDB casement and condo slim frame jobs most homeowners ask for. Wintech Building Products is the runner up for whole flat supply and installation without splitting vendors. Fenestra suits condo owners chasing larger glass panes and a cleaner modern profile. Expect to pay a mid range price for standard HDB windows and a higher price for custom frames or performance glass. All HDB window work must use an HDB approved window contractor.
Why HDB Window Rules Change the Search
Many Singapore homeowners assume any renovation contractor can replace HDB windows. That is wrong. HDB flats have strict rules, and only an HDB approved window contractor can install windows in most flats. I started looking after my cousin bought a 30-year-old resale flat in Tampines. The casement windows in the master bedroom were stiff, the rubber seals had hardened, and road noise from the expressway crept in every evening. She needed a window supplier who could measure, fabricate and install before her renovation deadline. I spent two weekends calling showrooms and checking which companies actually understood HDB requirements. This 2026 review came out of that search. It covers ten window suppliers in Singapore, from local fabricators like Casatino to glass specialists like AGC Glass Asia Pacific. Some sell direct, others work through renovation contractors. The cost differences are real, but the safety requirements are not optional. If you are new to the rules, read the HDB renovation guides first before comparing quotes.
Quick Picks: Top Window Suppliers Singapore Homeowners Ask About
Choose Casatino if you want a local fabricator that covers both HDB casement replacements and condo sound insulation frames. Choose Wintech Building Products on a tighter budget for whole flat supply and installation without splitting vendors. Choose Fenestra for large fixed or glass heavy windows in a condo where natural light matters more than a standard HDB profile. Choose AGC Glass Asia Pacific if you already have a contractor and only need high performance glass specified. Choose Breezway for louvre windows on a patio or facade, not a typical HDB flat.
Best Window Suppliers Singapore: Comparison Table
This table covers the best window suppliers Singapore homeowners ask about. Prices are split into three bands from lower to higher for a standard three room HDB job. If you are replacing windows as part of a wider project, the guide to renovating an HDB resale flat covers the sequence.
| Business | Best for | Price band | Area |
|---|---|---|---|
| Casatino | Homeowners replacing ageing HDB casement windows and condo residents who want slim frames with better sound insulation | $$ | Not stated |
| Wintech Building Products | Homeowners who want a single vendor to handle window supply and installation for a whole flat | $$ | Not stated |
| Brighten Architectural | Renovation teams looking for a workshop that can handle windows plus glass balustrades and partition walls | $$$ | Not stated |
| United Glass & Aluminium | Simple HDB window replacement and glass repair jobs where the scope is clear and no structural change is needed | $$ | Not stated |
| AVA Industries | Homeowners bundling window replacement with window grilles and gate maintenance in the same job | $$ | Not stated |
| Aluwin | HDB homeowners with unusual windows or bay windows where stock sizes do not fit | $$$ | Not stated |
| Alumax | Buyers who want one source for bedroom windows and bathroom glass screens | $$ | Not stated |
| Fenestra | Condo owners who want larger panes and a cleaner, modern look rather than the standard HDB window profile | $$$ | Not stated |
| AGC Glass Asia Pacific | Homeowners who want specific performance glass such as low emissivity or sound rated glass specified by their window contractor | $$$ | Not stated |
| Breezway | Homeowners designing a new facade or patio room with louvre windows instead of traditional casement or sliding windows | $$$ | Not stated |
10 Window Suppliers in Singapore Worth Calling
1. Casatino
This local manufacturer fabricates aluminium window and door systems in house, which helps with replacement windows for resale HDB flats. The range includes casement, sliding, folding and tilt and turn designs, so most HDB and condo layouts are covered. Renovation contractors often use Casatino for older flats because the frames can match existing openings without too much hacking. Condo owners looking for slim frames with better sound insulation also place this supplier on the shortlist. You can walk through profile samples and check corner joints before committing.
What’s good
- Local manufacturer with in-house fabrication
- Wide range of window styles and finishes
- Commonly used by renovation contractors for resale HDB flats
- Covers both HDB casement and condo sound insulation needs
What to watch
- Confirm whether the quoted installation team is HDB approved
- Lead time can stretch during peak renovation season
Who it suits Homeowners replacing ageing HDB casement windows and condo residents who want slim frames with better sound insulation. Buyers who only need a small glass repair should look at United Glass & Aluminium instead.
Price $$
Details Casatino
2. Wintech Building Products
This single vendor for supply and installation works across private and public housing projects, so it understands both HDB window replacement and condo management requirements. The team can coordinate with your renovation contractor on window sizes, frame matching and submission details. If you are still choosing one, compare this list of renovation contractors in Singapore. This reduces the back and forth when a whole flat needs windows replaced at once. Ask for the quotation to state the aluminium profile, glass specification and the installation timeline separately.
What’s good
- Established name in the aluminium construction trade
- Handles both supply and on site installation
- Can coordinate with contractors on condo window replacement rules
What to watch
- Search for the company’s current approved worker list before signing
- Quotes may exclude hacking or plastering around the old frame
Who it suits Homeowners who want a single vendor to handle window supply and installation for a whole flat. Those who only need one small casement window may find the minimum job charge too high.
Price $$
Details Wintech Building Products
3. Brighten Architectural
This aluminium and glass subcontractor handles windows, doors, curtain wall and facade works. Because the scope goes beyond windows, it is a common pick for renovation teams that need glass balustrades or partition walls in the same project. Landed property owners with non standard openings can use the workshop to fabricate frames that stock suppliers will not touch. Small commercial jobs are also inside its range. For a standard HDB flat, though, the price band reflects facade grade work more than simple casement replacement.
What’s good
- Range beyond windows into glass and facade work
- Likely to handle non standard dimensions for landed properties
- Can service both residential and small commercial jobs
What to watch
- Check if they sell direct to homeowners or only work through contractors
- Facade companies often quote higher for small HDB jobs
Who it suits Renovation teams and landed property owners who need windows plus glass balustrades or partition walls. A simple HDB replacement buyer should compare with Casatino or Wintech first.
Price $$$
Details Brighten Architectural
4. United Glass & Aluminium
The ability to handle glass and frame together sets this supplier apart for small jobs. United Glass & Aluminium fabricates window frames, glass panels, shopfronts and doors, so there is no gap between the glazier and the frame maker. The company also takes repair work, not just full window replacement. Short notice jobs are often possible, which helps when a cracked pane appears before a lease ends. The scope should be clear though, because this is not the place for redesigning wall openings or adding fixed glass panels.
What’s good
- Handles glass and frame together, reducing coordination issues
- Offers repair work, not only full replacements
- Short notice jobs are often possible
What to watch
- Repair quality varies with the crew assigned
- Ask if the price includes new rubber gaskets and hardware, not just glass
Who it suits Simple HDB window replacement and glass repair jobs where the scope is clear and no structural change is needed. Homeowners planning to alter window openings should look at Aluwin or Fenestra.
Price $$
Details United Glass & Aluminium
5. AVA Industries
A bundled metalwork package is the reason many older flat owners call this workshop. AVA Industries works on windows, grilles, gates and general metal works, which suits HDB homeowners who want window replacement and grille installation in the same job. The field installers come from a workshop based operation, and the item covers matching metalwork in older flats. If your gate is rusty or the grille is bent, bundling can reduce coordination. Still, you want a clear item breakdown to see what is frame, glass, powder coating and installation.
What’s good
- Can quote a package for windows, grilles and gates
- Workshop based business with field installers
- Useful for older HDB flats that need matching metalwork
What to watch
- Not every package includes powder coating and corrosion protection
- Request a breakdown by item, because bundled quotes can hide small markups
Who it suits Homeowners bundling window replacement with window grilles and gate maintenance in the same job. If you only need window frames, a specialist fabricator like Casatino may give a cleaner quote.
Price $$
Details AVA Industries
6. Aluwin
Custom sized frames are the core of this aluminium specialist’s work. Aluwin makes aluminium windows and doors for non standard openings, which matters when stock sizes do not fit. HDB homeowners with bay windows or altered openings often end up here after other suppliers refuse to fabricate odd dimensions. The frames are lighter than steel options and can be made to match a resale flat’s existing lines. Precise site measurement is the first step. Because custom colours and finishes change the cost, the quote should state the exact frame finish before production begins.
What’s good
- Custom fabrication for odd dimensions
- Aluminium frames are lighter than steel options
- Good for resale flats with altered window openings
What to watch
- Custom sizes need precise site measurement before production
- Ask about the frame finish because custom colours affect price
Who it suits HDB homeowners with unusual windows or bay windows where stock sizes do not fit. Buyers with standard openings may find a stock fabricator cheaper.
Price $$$
Details Aluwin
7. Alumax
A single source for bedroom windows and bathroom glass screens keeps this supplier on the shortlist. Alumax supplies aluminium windows, doors and shower screens for homes and offices, so one order can cover the wet areas and the dry rooms. Frames come in a selection of standard colours, which helps when you want a consistent look across the flat. The company works with both homeowners and contractors, so you can compare a direct quote against your renovation team’s price. Confirm which crew does each part of the job before work starts.
What’s good
- Covers windows plus interior glass products
- Frames available in a selection of standard colours
- Works with both homeowners and contractors
What to watch
- Check whether the shower screen team is the same crew doing window installation
- Warranty terms differ by product type, so confirm it in writing
Who it suits Buyers who want one source for bedroom windows and bathroom glass screens. Homeowners who need performance facade glass should specify glass type through AGC Glass Asia Pacific or a contractor.
Price $$
Details Alumax
8. Fenestra
Glass heavy modern designs define this supplier’s range more than standard HDB profiles. Fenestra focuses on modern glass windows, partitions and entrance doors for condos and landed homes. The slim frame options give more natural light, which is attractive in a condo living room with a full height opening. The company can coordinate with condo management requirements, but this does not remove the need for the owner to check by-laws. Large fixed panes look clean, yet they cost more to replace if cracked. For standard HDB casement windows, this is likely over specification.
What’s good
- Glass heavy designs suit contemporary interiors
- Slim frame options give more natural light
- Can coordinate with condo management requirements
What to watch
- Large fixed panes can be costly to replace if broken
- Condo barriers may require the use of approved common property contractors
Who it suits Condo owners who want larger panes and a cleaner, modern look rather than the standard HDB window profile. HDB flat owners replacing standard casement windows should look at Casatino or Wintech first.
Price $$$
Details Fenestra
9. AGC Glass Asia Pacific
This is a glass brand rather than a window installation company. AGC Glass Asia Pacific supplies architectural glass for windows, facades and interior glazing through fabricators and installers. Homeowners usually encounter the brand when their window contractor specifies low emissivity or sound rated glass for a noisy condo unit. The technical support is useful when comparing glass thickness and acoustic performance. Minimum order quantities may apply, so a small HDB repair is not a direct fit. You buy the glass through a qualified fabricator, not from a showroom counter.
What’s good
- Global glass manufacturer with strong technical support
- Can supply high performance glass for noisy condo units
- Useful resource for contractors who need specification help
What to watch
- Not a window installation company
- Minimum order quantities may apply
- Most homeowners will interact with this brand through a fabricator
Who it suits Homeowners who want specific performance glass such as low emissivity or sound rated glass specified by their window contractor. Those who want a supply and install package should call Wintech or Casatino instead.
Price $$$
Details AGC Glass Asia Pacific
10. Breezway
Louvre windows are this manufacturer’s focus, not standard casement or sliding units. Breezway makes louvre window and blade systems that allow natural ventilation while keeping rain out. That matters when you are designing a patio room or a new facade where cross ventilation is the priority. Custom length blades reduce the need for vertical mullions and keep sightlines clean. The products are sold through architects and selected suppliers, so you need a local dealer or installer. HDB approval is not automatic for louvre stacks in certain openings, so check before you commit.
What’s good
- Good for cross ventilation in tropical weather
- Custom length blades reduce the need for vertical mullions
- Can be specified for aluminium and glass blades
What to watch
- Louvre stacks may not meet HDB requirements for certain openings
- Need a local dealer or installer, so confirm who does the actual installation
Who it suits Homeowners designing a new facade or patio room with louvre windows instead of traditional casement or sliding windows. Standard HDB flat owners should not force louvres where HDB rules do not allow them.
Price $$$
Details Breezway
How to Choose a Window Supplier in Singapore
Choosing the right window supplier in Singapore means looking past the price band. A cheap quote can cost more if the frame leaks or the crew is not approved for HDB work. Window installation Singapore requires a contractor who can show a valid HDB window contractor identity card for the crew. The table below sets out the checks I make before asking for a site measurement. Site condition handling matters because HDB block facades vary, and many older flats have slight deviations from the original drawings. Installation quality and supervision separate a proper fabricator from a workshop that just cuts aluminium. Materials and glass specification should be written in the quote, not agreed over the phone. If the supplier cannot show a valid HDB window contractor identity card for the crew, stop the process there. Ask about waterproofing around the old frame before glass goes in. A written warranty with a named contact gives you somewhere to return if leaks appear months later. For openings with past seepage, a waterproofing contractor in Singapore can inspect before the window installer seals the frame.
| Criterion | What good looks like |
|---|---|
| HDB window safety and BCA approved installers | The supplier can show a valid HDB window contractor identity card for the crew. |
| Product range and frame profile | The supplier offers at least casement and sliding options, and can show cross section details for each profile. |
| Measure and site condition handling | A site visit is included, and the quote lists what happens if a frame has to be remade due to site tolerance issues. |
| Installation quality and supervision | The company has a supervisor or lead worker who checks waterproofing and frame alignment before glass is installed. |
| Materials and glass specification | The quote states the glass thickness, glass type and whether the frame uses powder coated aluminium. |
| Warranty and after sales service | The invoice includes a warranty period and a named contact for callbacks. |
| Showroom or sample quality | The supplier lets you inspect actual frame cuts, corner joints and glass samples before paying. |
Use the table as a checklist. If one criterion is missing, ask for it in writing before the first deposit. A good window supplier will not rush you through this. For a broader look at scheduling and budget, browse the home renovation guides before the window crew arrives.
Frequently Asked Questions About Window Suppliers in Singapore
Do I need HDB approval to change my windows?
Yes, most HDB flats require window replacement to be carried out by an HDB approved window contractor. HDB treats windows above certain levels as a safety item, because a falling frame can be dangerous. Changing from casement to sliding windows may also need approval if the opening or external appearance changes. You should check the latest HDB renovation guidelines for your flat type before signing any quotation. If your contractor cannot show a valid HDB window contractor identity card, do not proceed.
What is the difference between casement and sliding windows in Singapore?
Casement windows are hinged on one side and open outwards. They are common in HDB flats because they seal tightly against rain and road noise when closed. Sliding windows move along a track and do not need outward clearance, which suits high rise condo facades and certain bedrooms. Sliding frames save space but the tracks collect dust and need regular cleaning. For noise reduction in a busy area, a well sealed casement window usually performs better than a standard sliding unit.
Can a window supplier install window grilles at the same time?
Some suppliers can, but not all. AVA Industries, for example, can quote a package that covers windows, grilles and gates in one job. Many pure window fabricators only make the frame and glass, so you would need a separate metalworker. If you want both done together, confirm that the supplier handling the window part is an HDB approved window contractor. One coordination point reduces scheduling headaches, but always ask for an itemised breakdown so you can compare the grille cost separately.
How do I check if a window contractor is BCA approved for HDB work?
Ask the contractor for the HDB window contractor identity card. The card should show the company name and the worker’s details. You can also check the current list of approved window contractors through HDB’s official channels. BCA registration is a separate matter and does not automatically mean the firm is approved for HDB window installation. Never accept a verbal claim or a photocopy that looks unclear. A legitimate contractor will not hesitate to show the card before work begins.
Should I buy directly from a supplier or use my renovation contractor’s window vendor?
It depends on the project. Buying directly from a supplier often lowers the cost and gives you a clearer warranty from the fabricator. You may have to coordinate hacking, plastering and sealing around the window yourself. Using your renovation contractor’s vendor keeps one party responsible for the opening and the patchwork, which is helpful for complex jobs. For a standard HDB casement replacement, the best window suppliers in Singapore usually allow direct purchase with an approved installation crew. For large openings or full height condo glass, the renovation contractor’s vendor may be the safer route.
