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Measuring for Larson a Storm Door

Don’t get intimidated when it comes to preparing for your new storm door. We’ll take you step-by-step through the measurements you’ll need to ensure a perfect fit.


Measure the opening width (horizontally) in three places: one across the top, one across the middle and one across the bottom of the door (A, B, C). Record the narrowest dimension. Measure the opening height (vertically). Record the dimension.


Door Opening Size Guide

A 1-in. wide x 1-in. deep mounting surface is required. Hinge-side shimming may be required to fit existing opening. Use an appropriate shim thickness to reduce the opening to size noted. Shims are not included – household shim materials may include paint stir sticks or wooden yardsticks. Most standard storm door sizes are 32″ and 36″ wide, some models are also available in 30″ and 34″. Custom storm doors are available in many models, up to 8′ high.


Door Sizes Opening Width
(no shim required)
Opening Width
(shim required)
Min. – Max. Height
30” x 81” 29-7/8” – 30″ 30-1/16″ – 30-3/8” 80” – 81”
32” x 81” 31-7/8” – 32″ 32-1/16″ – 32-3/8” 80” – 81”
34” x 81” 33-7/8” – 34″ 34-1/16″ – 34-3/8” 80” – 81”
36” x 81” 35-7/8” – 36″ 36-1/16″ – 36-3/8” 80” – 81”

Updated on May 15, 2021

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