1. Why Interior French Doors Are a Stylish, Smart Upgrade
Installing interior French doors is one of the easiest ways to make your home feel brighter, more open, and more elegant. These doors have glass panes that let in natural light, even when closed. They’re perfect for rooms like home offices, dining areas, or bedrooms where you want some privacy but still want to feel connected to the rest of the house. They also add a touch of style that fits many home designs, from traditional to modern. Interior French doors aren’t just beautiful—they’re useful too. This guide will show you how to install them the right way.
2. Planning Before Installing Interior French Doors
Before starting, take some time to plan. First, choose where you want the French doors to go. Are you replacing an old door or adding one to a blank wall? Next, measure the opening. Accurate measurements are key. If you’re working with an existing opening, you’ll want to know its width and height. Also, decide if you want prehung French doors or slabs. Prehung doors come with a frame and are easier to install. Slab doors are just the doors—you’ll need to fit them into an existing frame. Get your tools ready, like a drill, screws, level, and shims.
3. Installing Interior French Doors: Step-by-Step Basics
Step 1: Check that your floor is level and the opening is square.
Step 2: If you’re using a prehung set, place the door frame into the opening.
Step 3: Use shims to level the frame and hold it in place.
Step 4: Drill through the frame and secure it to the wall studs with screws.
Step 5: Hang the doors on the hinges and check their swing.
Step 6: Make sure both doors meet evenly in the middle.
Step 7: If using slab doors, install hinges on the frame and door panels first.
Step 8: Check that doors open and close smoothly.
Step 9: Add interior trim and caulk the edges for a clean finish.

4. How to Frame French Doors Inside an Existing Opening
If you’re putting French doors into a wall that already has an opening, framing is very important. Remove the old door and trim first. Then, measure the rough opening. You may need to add or remove framing boards to fit your new doors. Use a level to keep everything straight. Make sure the sides are even and plumb. The opening should be slightly larger than the door frame to allow for shimming. Secure the framing with nails or screws. This is also a good time to install a new header if you’re widening the opening. Proper framing keeps the doors strong and secure.
5. Installing French Doors in an Existing Opening
When working with an existing space, it’s all about precision. You’ll want to clean the area and check the floor level. Slide the door frame into place and use shims to adjust it. Double-check that the doors are centered and level. If you’re installing interior double glass French doors, align the panels so they meet properly in the middle. Secure the frame with screws, and test the swing of both doors. If there’s rubbing or uneven gaps, adjust the hinges or add more shimming. Recheck the top and side clearances before finishing. A solid fit prevents future issues like drafts or sticking.

6. Choosing Between Prehung and Slab French Doors
Prehung doors come ready to install with the frame and hinges attached. They’re great for beginners or when building a new doorway. They save time and reduce mistakes. On the other hand, slab doors are just the door panels without a frame. They’re cheaper, but take more work to install. You’ll need to cut hinge slots and line them up yourself. If you’re replacing an existing door but keeping the frame, a slab might work fine. For most people installing interior French doors, prehung is easier and more reliable. It gives a clean, square fit with less stress.
7. How to Install a French Door Interior with Glass Panels
French doors with glass panels add light and style to your space. Start by handling the doors carefully so you don’t damage the glass. If they’re prehung, slide the frame into the opening and secure it with shims. Drill screws through the sides into the wall. Make sure the doors are level and swing without scraping. For slab glass doors, attach hinges to the door and frame, then hang them evenly. Use soft pads or bumpers so the doors don’t slam shut. Always wear gloves when handling glass. Glass French doors look great in offices, dens, or bedrooms where you want light and quiet.
8. Installing Prehung Interior French Doors Correctly
Prehung French doors make things easier, but you still need to be careful. First, measure the rough opening. It should be about 1/2 to 1 inch larger than the door frame on all sides. Place the unit into the opening and use a level to make sure it’s straight. Add shims between the frame and the wall to keep it steady. Screw through the frame into the studs. Check that both doors open, close, and line up properly in the middle. Adjust if needed. Once everything looks right, secure the trim and fill any gaps with caulk for a finished look.

9. What You Need to Know About Costs and Time
- Cost of Doors: Expect to pay between $200 and $600, depending on style and size.
- Prehung vs Slab: Prehung doors cost more but are quicker to install. Slab doors are cheaper but take more effort.
- Labor Costs: Hiring a professional can add $150–$300 per doo,r depending on complexity.
- Extra Materials: Don’t forget to include costs for trim, handles, hinges, and caulk.
- Time to Install: Prehung doors usually take 2–4 hours. Slab doors may take longer due to fitting work.
- Hidden Costs: Older frames or uneven walls may require extra framing or shimming.
- DIY Tools: If you’re doing it yourself, factor in tools you might need like a drill, level, and saw.
- Finishing Touches: Painting or staining the doors and touch-up work can add to both time and cost.
- Value Added: Well-installed French doors can increase the beauty and value of your home.
- Budgeting Tip: Always allow for 10–15% extra in your budget for unexpected issues.
10. Should You DIY or Call a Pro for French Door Installation?
Installing French doors is a project many homeowners can do, but it’s not for everyone. If you’re handy and have the right tools, it’s a good DIY project. You can save money and learn a new skill. But it does take patience, especially if you’re working with an old frame or uneven walls. If you’re unsure how to install French doors inside your home or want a perfect fit, hiring a pro is a smart choice. Caffey Construction can make sure your doors are level, sealed, and secure without the hassle. Mistakes can be costly, so consider your comfort level first.
11. Expert French Door Installation in Amarillo, TX
If you’re planning to upgrade your home with beautiful French doors, Caffey Construction can help. We install interior double glass French doors, prehung units, and more. Whether you’re working with an old frame or need a new one built, we bring the tools and experience to get it done right. We’re proud to serve Window Replacement Amarillo, TX, with reliable service and great results. From framing to finishing touches, we make sure everything fits, swings, and seals the way it should. If you want your French doors to look and work perfectly, we’re here for you.
Conclusion
Interior French doors are a great way to add light, style, and functionality to your home. Whether you’re opening up your office, dividing two rooms, or updating a bedroom entry, they can completely change the feel of a space. Installing interior French doors takes planning, patience, and the right tools. From framing the opening to hanging the doors and sealing the trim, every step matters. Whether you use a prehung kit or go the slab route, the final result is worth the effort.
Caffey Construction is ready to help you install your interior French doors with care and precision. Call us today to start your home improvement project with confidence and ease.