How to Measure Windows for Motorized Screens

Check one: the opening is square enough. Compare your three widths. If top, middle, and bottom agree within a quarter inch, the opening is a normal rectangle and any standard mounting works. If they spread wider than that, the opening is racked - common in older homes where the framing has settled - and the mounting plan has to accommodate it, usually with wider tracks or a furred mounting surface. This is not a problem; it is just information. But it is information that has to reach the person building the screen, which is why we re-measure every opening ourselves on the estimate visit.

Check two: the mounting surface is real. The housing - the cassette the screen rolls into - needs a flat, solid surface across the full width of the opening, and the side tracks need a flat run down both sides. Walk each window and look for what breaks the plane: decorative corbels, protruding keystones, heavily textured stucco, or trim that steps in and out. A couple of inches of flat surface on each side is usually plenty; interrupted surfaces are what need planning. Note the material too - wood trim, stucco, brick, and fiber cement each take different fasteners, and the installer brings the right ones when they know in advance.

Check three: the obstruction sweep. Stand at each window and ask what the dropping screen would hit. Crank-out casement handles are the classic collision - they protrude right into the screen’s path. Then check: window locks, tilt latches, security bars, exterior outlets and light fixtures beside the opening, hose bibs below it, and landscaping that has grown into the drop zone. None of these are deal breakers. Handles get swapped for folding low-profile versions, tracks get surface-mounted proud of the obstruction, and screens get grouped to cover window pairs as one unit. But every one of them changes the plan, so the sweep has to happen before ordering, not after.

Check four: inside mount vs. outside mount. For heat control, outside mount wins - the screen stops the sun before it reaches the glass, which is the entire physics advantage of exterior shading. Inside mount only earns its place when the exterior cannot be touched: deep-set windows with no surrounding wall to mount to, historic facades, or HOA rules that forbid exterior changes. If both are physically possible, we recommend outside mount. If you are unsure which your windows allow, that is a two-minute question on the estimate visit - our buying guide covers the rest of the product decisions.

Bonus check: group windows that share a wall. A run of three or four windows on the same wall plane can often be covered by one wide screen instead of three or four narrow ones - one housing, one motor, one remote channel, and a cleaner look. Note these groupings in your measurements: which windows sit on the same flat wall with nothing structural between them. Wide single units have span limits, and very wide runs may need a coupled pair with a center support, but the grouping question is free money when it works. Flag the candidates and let the estimator confirm which runs qualify.

Here is the honest line: your measurements get the conversation started, and our measurements finish it. Take the rough widths, heights, and photos - that is genuinely useful, and it lets us give you a realistic budget range before anyone drives out. But the final numbers, the ones the screens are manufactured from, come from the installer who is responsible for the fit. We re-measure every opening on the estimate visit, confirm every mounting surface and obstruction in person, and own the result. There is no version of this where you are on the hook for a mis-measured unit.

Stop and call us in when any of these show up: openings wider than a standard single unit (large multi-window runs need coupled or divided screens), second-story windows you cannot safely reach with a ladder, arched or angled tops, and any opening where the mounting surface is questionable - crumbling stucco, rotted trim, or stone veneer. These are all solvable; they are just not DIY-measuring territory. Our estimate-visit guide shows exactly what happens when we come out, so there are no surprises.

We install motorized screens across San Diego, Los Angeles, Orange, Riverside, and San Bernardino counties. Send your rough measurements and photos to (909) 325-3110, and the estimate visit confirms every number on site - free, with a written quote and the full mounting plan. Browse all our shade guides while you are at it.

The number one measuring trap is the opening that is not square. Older stucco homes settle, wood framing moves with the seasons, and an opening that looks like a clean rectangle can be a quarter inch wider at the top than the bottom. The rule is simple: measure width in three places (top, middle, bottom) and height in three places (left, center, right), and treat the smallest width and the smallest height as your numbers. A screen built to the largest measurement will not fit the smallest part of the opening, and there is no stretching a finished screen.

The second trap is measuring the opening instead of the mounting surface. The screen does not mount to the hole; it mounts to the flat, solid surface around the hole, and that surface needs enough depth and continuity for the tracks and the headbox. Decorative trim, protruding sills, conduit, and hose bibs all eat into that surface. Measure the clear, flat, unobstructed mounting area, not the glass, and note anything that sticks out more than half an inch. Photos of each side of the opening, taken straight on, tell us more than a fourth decimal place ever will.

When in doubt, stop measuring and start texting. Rough numbers plus straight-on photos to (909) 325-3110 get you further than perfect numbers on a guess about the mounting surface, and every measurement gets confirmed on site during your free estimate before anything is built. The tape measure gets the conversation started; our laser gets the final word.