Measuring Windows Correctly for Blackout Roller Blinds

Achieving a flawless blackout roller blind fit starts with careful measurement. Follow these pro tips when sizing your windows for custom shades that block light perfectly.

We'll cover key dimensions, accounting for obstructions, inside vs. outside mounts, ordering the right size and potential adjustments.

Where to Measure

To customize blackout roller blinds, crucial window measurements include:

Inside Mounts

Width - Precisely measure across the top, middle and bottom of the window frame opening. Use the smallest dimension.

Height - Gauge from top to bottom of frame opening on left, center and right sides. Use the tallest height.

Outside Mounts

Width – Measure the exact area the blinds will span, wall-to-wall.

Height – Mark desired height of shade coverage from top to bottom.

Measure identically on all windows receiving shades for uniformity.

Mind the Obstructions

Account for window elements impeding blind operation or fit:

Deduct screen frame widths from opening size.

Adjust for thick moldings, curved frames or sills.

Note cranks or handles reducing clear width/height.

Measure around obstructions for accurate sizing.

Choose Inside or Outside

Mounting position affects your strategy:

Inside - Blinds install within frames for a built-in look. Requires ultra precise measurements.

Outside - Mounted externally, overlapping the frame. More margin for error but potentially wider light gaps.

Consider room aesthetics, window functionality and blackout needs when deciding.

Order Precise Dimensions

Provide the factory exact measurements for each window's blinds rather than just the maximum.

Slight size discrepancies between windows? No problem - order different custom dimensions versus one standard size.

This guarantees a tailored fit. Trimming wider blinds is easier than adding material.

Now enjoy perfectly sized blackout blinds merging both form and full-on function!