Outside mount blinds are installed on the wall or molding above the window frame to provide maximum light coverage and minimize light gaps. This mounting style extends the blind beyond the window opening on all sides for complete coverage.
When Outside Mount Is Required
Outside mount becomes necessary when the window frame lacks sufficient depth for inside mount hardware. Most blinds require at least 2 inches of flat surface inside the frame. Windows with shallow frames, irregular shapes, or no frame at all require outside mount. This method also works when windows have unusual obstructions such as cranks, handles, or locks that would interfere with inside mount operation.
Light Blocking Advantage
Outside mount blinds provide superior light blocking because the blind extends past the window frame. Light cannot enter around the edges as it can with inside mount. For maximum light blockage, extend the blind 2 to 4 inches beyond the frame on all sides. Adding side channels or fascia boards further eliminates light leakage and creates a sealed appearance.
Visual Impact
Outside mount blinds make windows appear larger because the blind covers more wall area. This creates a broader visual rectangle that draws attention to the window as a feature. The extended coverage can balance asymmetrical windows or make small windows feel more substantial. Outside mount also allows for creative placement, such as mounting near the ceiling to create the illusion of height.
Measurement Guide
Width Measurement: Measure the width of the window opening. Add 2 to 4 inches on each side for standard light coverage. Add more for maximum light blockage or to achieve a specific visual proportion.
Height Measurement: Measure from the desired mounting point to where the blind should end. Mounting 2 to 4 inches above the frame is standard. For ceiling mount, measure from ceiling to sill or floor.
Frequently Asked Questions
Do outside mount blinds look good?
Yes, outside mount blinds look intentional and custom when properly sized with adequate overlap and professional installation.
How much overlap is needed for outside mount?
Minimum 1.5 inches on each side for light control. Two to four inches provides optimal coverage and visual balance.
Can outside mount blinds be installed on any window?
Yes, outside mount works on any window because it mounts to the wall or ceiling rather than requiring specific frame conditions