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How to Measure for Patio Door Verticals

Vertical blinds work well to control the amount of light entering a room. Their ability to rotate and draw like draperies make them a versatile option for sliding glass patio doors. Easily operated, they offer a degree of privacy and insulation from outside elements. Verticals can be made from vinyl, aluminum, cloth, composite and even wood, and can be customized to blend in with any decor scheme. Accurate measurements will ensure vertical blinds cover your patio doors perfectly and minimize any light gaps or operational problems.

  1. For outside mount: Measure patio door opening from left to right. Include any window trim or moulding. Round to the nearest 1/8 inch.

  2. Add 4 inches to this measurement. This will allow vanes to cover window trim and eliminate any light gaps that may occur at the sides. If space does not allow for a 4-inch overlap, reduce this number by half. Write down the measurement. This is your patio-door width.

  3. Measure patio-door opening from top to bottom. Include any window trim or moulding. Round to the nearest 1/8 inch.

  4. Add 3 inches to this measurement. This will allow for space needed above the patio door for mounting brackets. If vertical blinds are to reach to the floor, deduct 1/2 inch for clearance. This will ensure blinds operate correctly and do not drag at the bottom. Write down the measurement. This is your patio-door height.

  5. For inside mount: Window openings are sometimes uneven. To find the most accurate measurement, measure left to right inside the patio-door frame at the top, middle and bottom of the opening. Select the smallest measurement. This is your patio door width.

  6. Measure top to bottom inside the patio door frame at the right side, in the middle and at the left side of the opening. Select the smallest measurement. Deduct 1/2 inch from this number for clearance. This is your patio door height.

About the Author

Tanya Soraya Ruys is a published author who writes about home improvement, interior design, alternative medicine, culture, film and social media. She is currently working on her master's thesis in film and creative writing at Sonoma State University in Rohnert Park, Calif.