How to measure your Security Screen French Door

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A French security door is two doors that meet in the middle. Measuring is the same idea as a single — opening width, opening height, knob centers — with one extra step: lining up the openable side of your security doors with the openable side of your existing house doors. Final measurements are confirmed on site before fabrication begins.

What you need

Tape measure, Short ladder.

Step 1 Confirm how your house doors open

Make sure your French house doors open inward into the house, and decide which leaf is the active (openable) one. We line up the openable side of your security doors with the openable side of your house doors so they work together.

Step 2 Measure the structural opening

Most French openings are a 6×7 (about 72" wide × 80" tall) or a 6×8 (about 72" wide × 96" tall). Measure your width in inches in three places — top, middle, and bottom — and write down the smallest of the three. We finish the pair at about 72½" overall so the doors sit inside the opening with a clean ¼" of clearance on each side.

Step 3 Measure the height from the threshold to the top notch

Run the tape from the threshold to the top notch on the wood trim. For a 6×7 opening that is 80". For a 6×8 opening that is 96".

Step 4 Note your knob and deadbolt centers

From the top notch downward, measure to the center of your existing knob and deadbolt. Standard centers are 41" for a 6×7 and 57" for a 6×8. Write down what you have and we will match it.

Things to watch for

  • Wood trim that is uneven across the three width measurements? Note it. Trim adjustments may be needed at install so the doors fit flush.
  • Knob sticking past the trim? A lower-profile knob may be needed.
  • Threshold lower than the wood-trim groove? A flat-bar transition may need to be added so the doors close flush.

Reference photos

Existing dual-door opening on stucco
Existing dual-door opening on stucco
Existing French entry — typical 6×7
Existing French entry — typical 6×7
Olson French security doors installed
Olson French security doors installed

What to send us

Width (top/middle/bottom), height, knob/deadbolt centers, and a couple of phone photos of the opening from outside.

Ready to start? Open the Security Doors builder →

Final measurements are confirmed on site before fabrication begins. No payment is collected during the online builder.

Measuring something else? See the single Olson Security Door guide · Olson Security Slider guide.

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