Invisible grilles are a type of grille that are set up to provide safety yet not blocking overall view of a window or balcony.

Have a look at our Buyer's Guide to help you make a more informed choice.

Introduction

Invisible Grille uses stainless steel cables to enclose an opening (e.g. balconies) to protect people from falling through them. Unlike traditional grilles that can be bulky and overbearing, invisible grilles are hardly noticeable from afar. They do not block wind nor the view and  do not interfere with the interior design.

Types

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TypeDescriptionProsConsCost(Avg)Idea For
Fixed Invisible Grille Fixed Panel

Is fixed into position once installed, these are the most common type of install for invisible grilles. 

Other than balconies, this type of install is also possible for staircase, railings or windows.

  • Unblocked view
  • Fixed, once installed.
  • Must install from ceiling to floor
  • Nylon - $5.5 psf
  • Teflon / PTFE -  $7.5 psf
  • Solid steel wire - $10 psf
Quick Estimate
  • Balcony
  • Bedrooms
Fixed frame

This comes with a fixed frame where the invisible grilles will be housed. They are mounted on top of existing window frame and hence will be protruding out (around 5cm).

It comes with two ways to layout the grilles:

  • Horizontal layout – Invisible Grilles are secured left to right
  • Vertical layout – Invisible Grilles are secured top to bottom
  • Unblocked view
  • Encased in a frame, hence no need for install from ceiling to floor
  • Casement will require space which would be protruding out of the window ledge
  • Fixed, Once installed. This frame is fixed and can’t be open.
  • Frame with Nylon - $10 psf
Quick Estimate
  • Bedrooms
Openable Grille

This design is built in such a way that allows your window to be opened Left or Right, just like your usual windows without any restrictions.

It comes with two ways to layout the grilles:

  • Horizontal layout – Invisible Grilles are secured left to right
  • Vertical layout – Invisible Grilles are secured top to bottom.
  • Encased in a frame, hence don’t need to install from ceiling to floor
  • Can open up to have access to the windows for cleaning
  • Casement will require space which would be protruding out of the window ledge
  • Requires space for the casement to be opened fully.
  • Casement with Nylon - $28 psf
Quick Estimate
  • Kitchen
  • Yard
  • Bedrooms
Sliding Invisible Grille

Instead of opening left or right, this design allows the casement to be slide to the left or right.

With the sliding track, there some protruding out from the wall (around 15cm).

  • Can open up to have access to the windows for cleaning.
  • Don’t  require space for the casement to be opened fully.
  • One side of the casement will always be used for pushing the grille open.
  • Requirement cleaning of the bottom track as it can pick up dust easily and prevents it from sliding freely.
  • Casement with Nylon - $28 psf
Quick Estimate
  • Kitchen
  • Yard
  • Bedrooms
Bi-Fold Invisible Grille

Fashioned using a bi-fold approach, the casement is designed to be folded twice. This can be folded to the slide allowing more access to the window.

They are mounted on top of existing window frame and hence will be protruding out (around 15cm).

  • Can open up to have access to the windows for cleaning.
  • Casement will require space which would be protruding out of the window ledge
  • Casement with Nylon - $28 psf
Quick Estimate
  • Kitchen
  • Yard
  • Bedrooms

Buying Considerations

  • Country of Origin  - There are some that are particular about where the grille is been manufactured. And this does play a part in the costing. So do clarify on that and agree on one that you’re comfortable with.
  • Cable - This is the core of an invisible grille setup and provides safety for people using it. An invisible grille uses a continuous loop of stainless steel cable passing through a series of knobs (that looks like a pulley system) located at the top and bottom of a window or balcony. The following attributes of the cable would result in the different safety and maintenance aspect of a grill setup.
    • Type and Grade - Invisible grille cables are using stainless steel which are highly resistant to rust but rust will ultimately happen, but speed of that happening will depend on the grade of the stainless steel. Typically used are the 316 stainless steel, which are considered marine grade. Anything below that and risk of getting rust is alot higher and faster.
    • Cable Braid Type - the stainless steel cables are braided to provide flexibility  and mechanical strength for the cable. Typically they’re braided in a 7x7 fashion. This means 7 strands of stainless steel wire is braided into a single thicker wire. Then 7 of these thicker wire are braided again to form the final product. The higher the numbers will provide more durability but will be having less flexibility.
    • Thickness - The cables come in different thickness. There are 2mm, 2.3mm and even 2.6mm. In general, the thicker the better but do make sure the braid type is also sufficient of your usage.
  • Membrane Material - Cable's membrane is to protect the cable against all weather elements. They are all made out of some plastic variants and will weaken over time (due to Sun’s UV exposure). Hence it is recommended to get a good membrane if the balcony/window is constantly exposed to strong sun.  Currently in the market are 2 types of material used for the membrane. Nylon, Teflon:
    • Nylon: While this is the most common membrane used in Singapore, please note that there’re many grades of Nylon available (e.g. Nylon 6 , Nylon 11, Nylon 12, etc..).  A better graded Nylon would be more durable but costlier as well. If possible, get the grade of nylon used from each vendor to compare.
    • Teflon/PTFE: Teflon coating has been claimed to be superior than Nylon and has been touted to have heat tolerance compared to Nylon. And hence would ideally last longer out in the sun. Cost of Telfon is also higher than Nylon and not all vendors in Singapore carry such offerings.
  • Warranty Type & Period - Warranty ideally should cover on the cable against rust and workmanship related issues (e.g. loosening of the cables). This is typically around 5 years. The other warranty should be with the cable’s membrane against peeling or wear and tear that deems abnormal (typically membrane should last around 3 years). This warranty is provided for around 3 years.

FAQ

Technical Terms

  • Membrane - A layer of plastic coating that is wrapped around the grille's wire. Typical materials are Nylon, Telfon.