Secondary glazing is a second frame fitted on the room side of a window you already have. The designs here are slim aluminium frames set inside the reveal of a sash window, with their own meeting rail and glazing bars lined up with the original sashes.
The existing window stays in place. The aluminium frame sits just inside it, so the outside of the house is unchanged and the room gains a sealed inner pane. That is the usual way to improve an older sash without replacing it.
Why choose aluminium secondary glazing
A slim aluminium frame can follow the sash bars closely, so the inner window does not look like a second, heavier frame.
The original window stays
The outer sash is left where it is. The new frame is fixed inside the reveal, in front of the existing glass.
Bars that line up
The secondary frame repeats the meeting rail and the vertical bar, so the two windows read as one from inside.
What is included
The secondary unit is made to the inside of the opening, not to a new outer frame.
An inner aluminium frame
A slim frame with its own glass, fixed to the reveal so it can be opened for cleaning and ventilation.
Set to the existing sash
The rail and bars are positioned to sit over the lines of the window behind.
- Fitted inside the existing window
- Slim aluminium sections
- Used on sash windows that are staying in place
Secondary glazing layouts
The photographs in this range show the inner frame against a sash.
Inner frame in the reveal
A matching meeting rail
Vertical glazing bars
We measure the inside of the reveal, including any architrave, so the frame sits square even if the old sash is not.
Secondary glazing designs
These are designs from our secondary glazing (aluminium) range. Open any image to view it larger.
Frequently asked questions
No. It is a second frame on the inside. The existing window stays.
Yes. These designs are made to sit in a sash reveal, with a meeting rail and bars that follow the original window.
Yes. It needs to open so you can vent the room and clean the glass on the original window.
No. The aluminium frame is on the room side, so the outside elevation stays as it is.