How To Install Interior French Doors In Existing Opening

Do you want to add more space and light to your home, but can’t expand your home because of a narrow side yard or other restrictions? Installing French doors as an interior addition is a great option. With the right measurements and a few key tips, installing interior French doors is fairly simple. If you want to install new French doors inside your existing home, you’ll need to measure carefully and pay attention to details like door swing, threshold height and lighting. Read on for all the insider information on how to install interior French doors in an existing opening.

Measure the Opening and Determine Your Door Type

Before you even think about buying or installing a new door, you’ll need to make sure you actually have an opening for a door. Measure the width and height of the opening for the interior door. The best way to find out about the type of door you have and how to install it is to ask a contractor who specializes in doors. They can also help you measure and find the best French door for your opening. If you have an existing standard 36-inch interior door, installing a French door will be a simple project that can be done by a DIYer. If you have a standard 36-inch exterior door, installing a French door will require a lot more work and should be done by a contractor.

Choose Your Hardware and Order Your Doors

Now that you’ve measured your opening and know what type of door you want to install, you can start ordering your door. Be sure to order your door far enough in advance so that you can work with a contractor who specializes in doors. When you order your door, be sure to ask about the threshold height. The threshold should be a little lower than the exterior ground level. This will ensure water and debris doesn’t get in your house.

Install the Track and Shims

The first step in installing interior French doors is to install the track. The track is the horizontal bar where the doors will slide back and forth on. If the opening is less than 76 inches, you’ll need to install shim rails to get your doors to slide smoothly. To install the tracks, follow these instructions: – Measure the width and height of the opening, and buy shim rails that extend the length of the opening. – With a level, mark the length and height of the opening on each shim rail. – Hammer the shim rails into the studs on each of the walls where you have an opening. – Place the rail against the wall and drill pilot holes into the ends of the rails. – Place screws through the rails and into the wall studs.

Install the Interior Doors

Now it’s time to install the gorgeous new doors you’ve been waiting for! – Double-check that the tracking is properly installed. – Put the doors on the track and make sure they slide smoothly. – If the doors don’t slide smoothly, additional shims may be needed to level out the track. – With a level, check that the doors are level from top to bottom. – Make sure the doors are flush on the top and both sides. – Check that there isn’t any light coming through the doors. – Put an exterior door seal on the bottom of the door.


Installing interior French doors is a great way to add light and space to any room. Before you start the project, make sure that you have the right size opening and measurements for the doors. With careful planning and attention to detail, you can install French doors in an existing opening in a couple of days. With new doors, you’ll instantly see an improvement in the space. You’ll get more light, and your home will seem more open and spacious. And best of all, installing French doors is a relatively easy DIY project that anyone can do!

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