Sliding window invisible grilles are designed for Singapore’s most common window type, with cables installed within the frame so sliding panels move freely. Suitable for all HDB and condo sliding windows, they provide unobstructed views with maximum safety. Endo Grilles installs sliding window invisible grilles from $300 per panel.
A sliding invisible grille is a custom-fitted safety grille that glides on a track alongside a sliding window or balcony door, so the window keeps its full opening width while stainless steel cables prevent falls. It’s part of Endo’s Openable Invisible Grille range — full pricing is on our Invisible Grilles Pricing Guide, starting from $400 for a standard HDB sliding window.
Why choose an openable grille for this window
| Reason | Why it Matters | Compulsory? |
| Access-required windows | A must for any window you need to physically go out through — reaching an aircon compressor for servicing, or accessing an outdoor laundry rack | Yes |
| Pet-safe by design | The 1.5-inch gap between cables makes it difficult to reach and open the window handle, adding a layer of protection if you have cats or other pets that might otherwise nudge a window open | Yes |
| Easier window cleaning | Not essential, but a real convenience if you clean your windows often | No |
| Required for insect mesh | If you’re planning to install insect mesh on this window, an openable grille is a must | Yes |
Why sliding windows need a specific fitting
Sliding windows and balcony doors run on a track — the grille has to be fitted to glide alongside that track without narrowing the usable opening
Very common on condo balcony access points and HDB service yards
Poor track alignment is the most common installation issue with sliding grilles specifically — needs accurate measurement of your existing track
How it works
Arrange for a site visit — we measure your sliding window or balcony door track
Custom sliding frame fitted to run alongside your existing track
Test glide and lock function together with our installer
Where this is most requested
Condo balcony sliding doors (very common request from condo owners)
HDB service yard and kitchen sliding windows
Landed property sliding doors leading to gardens or patios
No — it’s designed to run alongside your existing track without reducing the usable opening width.
Yes, this is one of the most common uses for sliding invisible grilles, especially in condos.
“Openable” is the general pricing category covering swing casement, sliding, and bifold types. Sliding specifically glides horizontally along a track, rather than hinging open like casement or bifold types.
The 1.5-inch gap between cables makes it difficult to reach and open the window handle, which adds a layer of protection against pets nudging a window open. It’s not a lock replacement, but it does make accidental opening much harder.
Sliding grilles fall under Endo’s Openable Invisible Grille pricing, from $400 for a standard HDB window. See our full pricing guide for size-based and apartment-type pricing.
Explore Our Invisible Grille Range
Have casement windows instead? See our casement window invisible grilles. Choose from All Weather Cables™, nylon-coated cables, or Swiss Diamond Rods for your sliding windows. Cat owners can explore our cat-proof invisible grilles. View pricing details or request a free quote.
Related Guides
- The Complete Guide to Window Grilles in Singapore (2026)
- Invisible Grilles vs Mesh Grilles: Which Is Better?
Frequently Asked Questions About Sliding Window Invisible Grilles
How are invisible grilles installed on sliding windows?
Invisible grille cables are mounted within the window frame using top and bottom anchor points, positioned so they do not obstruct the sliding panels. The cables sit in front of or behind the sliding track, allowing the windows to slide freely.
Can I still open my sliding windows with invisible grilles?
Yes. The installation is designed so that sliding panels move freely without catching on the cables. You can open and close your sliding windows normally for ventilation.
How much do sliding window invisible grilles cost?
Sliding window invisible grilles start from $300 per panel at Endo Grilles. The price depends on the window width, height, and number of panels. We offer free on-site measurement for accurate quotations.
Are sliding window invisible grilles HDB-approved?
Invisible grilles are widely installed in HDB flats across Singapore. While HDB does not formally certify grille brands, invisible grilles meet the safety intent of BCA guidelines for high-rise window protection. No HDB approval application is needed for installation.
How long does sliding window invisible grille installation take?
Most sliding window installations are completed in 2 to 3 hours for a typical 3-room or 4-room HDB flat. Larger homes with more windows may take half a day.