TYPE 01
Casement windows
Check how far the sash and handle swing into the room, and confirm there's a clear recess with enough depth in front of the handle.
Window compatibility
WINDOW STYLE IS ONLY THE FIRST CHECK
Recess depth, handles, hinges and opening direction decide whether a blackout frame can sit safely in the opening — so the checks below matter more than the label on your window.
If anything here is unclear, send us photographs before you order and we'll go through the opening with you.
Window schedule — six common styles
MATCH YOUR WINDOW, THEN CHECK THE DETAILS.
Every recess is different, so treat these as a starting point — the checks in each entry matter more than the category.
TYPE 02
Tilt & turn windows
The sash can tilt or swing inward, so clearance needs a closer look. Measure the usable recess depth and confirm the frame won't obstruct the handle or its opening path.
TYPE 03
Sash windows
Check your mounting position won't interfere with the moving sash, and that the recess is sufficiently square.
TYPE 04
Fixed windows
Usually the most straightforward, since there's no moving sash — but recess depth and trim shape still matter.
TYPE 05
Bay windows
Treat each opening separately. Check the side angles and whether adjacent frames would clash.
TYPE 06
Not currently offered
Skylights, roof & angled glazing
We don't recommend BLOCKER for overhead or angled installations, whatever a reference photo might suggest.
Uncommon opening?
SEND PHOTOGRAPHS FIRST
Contact us before ordering if any of the following apply — a quick photograph is faster to resolve than a returned order.
Send photographs before ordering if you have
- Arched or shaped openings
- Unusually deep handles
- Shutters inside the recess
- Vents in the proposed fitting area
- An opening visibly out of square
- Sliding doors or very large glazed openings