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Windows
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Windows
French Doors
Patio Doors
Front Doors
Roller Shutters
Window Sills
A door frame extension, also known as door jamb extension, is a small add-on profile used to increase the width or height of the door or window frame of one or our purchased profiles.
An extension jamb is commonly used in the following instances:
To create a level surface for installation if walls are uneven
To hide an unattractive architectural feature
As a solution to stairs or furniture obstructing the door opening
To line walls for successful roller shutter guide rail installation
Installed at the top of the frame to support a roller shutter box
Because the frame extension commonly plays such an important role in terms of supporting roller shutter boxes and for the successful guide rail installation, they should always be selected when purchasing our door or window roller shutters unless there is good structural reason not to.
At windows24.com, door or window jamb extensions are available in the same range of materials as our profiles are – aluminium, wood, uPVC, wood-alu, and uPVC-alu. This means that they blend beautifully with the rest of the product and will come in the same colour to match.
In terms of the materials there are a few extra options to mention. For customers requiring relatively small wood door extensions of 30 mm of less, these will not come as their own attachable extension profile. Rather, the frame is manufactured in a larger spoke size to include the dimension. Another point to mention is that for uPVC frame extensions that are large enough, there is the possibility to select a built-in steel reinforcement for increased strength and impact resistance.
Correct and accurate measuring is important to ensure that new doors fit the opening.
The dimensions submitted in the first page of the configurator should be the total required dimensions for the door, including the extension profile.
The exact dimensions for the extension profile can then be added in the relevant section on the second page.
For further guidance here, please refer to our user-friendly measuring guide on how to measure for doors or feel free to contact the team.
If you require an extension jamb with particularly large dimensions, two can be ordered and easily attached to one another (a 30 mm jamb and a 50 mm jamb for an 80 mm extension requirement, for example).
Except for small wooden frame extensions mentioned above, extension jambs are delivered as separate pieces along with the door.
Installation is made easy as frame extensions can be easily secured to the main door profile with a single click.
Snug installation with no rooms for cold draughts or water entry is therefore ensured.
