How to Fit French Doors.

how to fit french doors

If you’ve been looking to insert some French doors into your home but haven’t known where to start, we have a perfect guide to fitting your own doors. Don’t be afraid to experiment with some of your own DIY in the home to create an open and welcoming atmosphere.

French doors have been traced back to 17th Century France in the midst of the Renaissance when the use of glass in architecture became highly popular as well as allowing more light into the home. The French doors began on the wealthy’s balconies so that they could open their windows and step out to a view. Over time, these ‘windows’ became well thought of as doors. They soon became popular overseas, like England, and were used on lower level properties as well as balconies.

Before you start, make sure that you have all the tools that you need for the job so that you can complete the job efficiently and quickly.


Step 1 

Measure your space with a tape measure to see how much room you have to play within your opening. You must measure the width of the opening at the top, middle and bottom taking the shortest measurement if they differ slightly. Also, measure the height from the top to the underside of the door trim up to the top of the sill. To be extra sure, why not double-check your measurements against the sizing of your door so you aren’t caught short. 

Step 2 

If you are replacing your pre-existing French doors for new doors, then you must first remove your pre-existing door frame whilst being cautious not to damage the trim as you will need that for the installation of your new French door. 

Step 3 

If you have measured correctly, your opening should be the perfect size to fit your french doors and you should ensure they are square and level. If your opening is slightly lop-sided then you may want to use sandpaper to adjust it to ensure it’s straight. 

Step 4 

You must consult your individual instructions to ensure that you are accurately fitting your French doors. With your instructions in mind,  use shims to hold your frame in place.

Step 5

Double-check that your doors fit into the frame by picking them up and placing them in– if they do then it’s time to start screwing your doors into the frame. 

Step 6 

Drill your screws into the frame and hang your doors according to the specific instructions given. This will be a two-person job, support the doors and guide them into place, be careful not to be too rough to damage the frame or glass.

Step 7

Exterior doors will need a few more extras than interior French doors,  you must ensure that your sealant is executed accurately and distributed well. Weatherstripping will be necessary to conceal any gaps to ensure there aren’t any draughts getting in. 

If at any point in the process you run into difficulty or are struggling, remember to consult a professional to ensure that the doors are structurally safe and sturdy. Consult your instruction sheet to be sure that you have completed all said details.

Alternatively, if you’re replacing a window for a French door then this entails something a little different. 

Step 1 

Size up the area that the new doors will be located, and begin to take the sealing and screws out of your window frame. Following this, scrape away the silicone from underneath the window and remove the trims.

Step 2

Remove the existing windows by undoing the brackets, this should be a two-person job. Proceed to mark out where you want your French doors to be, measuring to make sure that they will fit. 

Step 3

Take a disc cutter, make sure you have protection over your face for any potential debris. Do not cut all the way through the wall but instead use it as an indicator and repeat the same process on the inside of the house.

Step 4  

Take a club hammer and begin to chip away at the wall you will be removing and replacing for your French doors. You should then fit your sill to make way for the fitting of the doors.

Step 5  

You must sit the doors on the raised sill lip to ensure they’re sat properly within the frame. If there are gaps, ensure you fill them with weatherstripping sealant to ensure there aren’t any draughts.

Step 6

Once the frames are securely in place, you can continue to fit the glass.


If you face any difficulties in the process, be sure to consult a professional and refer to your individual fitting instructions.

Here at ATT Fabrications, we stock a stunning range of, both, UPVC bi-folding doors and aluminium French doors so that you can find exactly what you’ve been looking to incorporate into your home.

Design your own UPVC French door as well as your own aluminium French doors so that you can create something that little bit more personal to fit in with your home interior. 

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