To install French doors, prep and seal the opening, set the prehung unit level and plumb, then secure it and add the hardware.
French doors bring light and a wide, open feel to any back wall or patio. A handy homeowner can take on this job, but it asks for care. Hinged doors must hang dead plumb, or they swing open or stick on their own. In Tampa, impact-rated French doors add weight and a few code rules too. This guide covers how to install french doors the right way, step by step. You’ll also learn when a pro saves you money and stress.
Key Takeaways
- Prehung French doors are an intermediate to advanced job.
- Plan on two people and most of the day.
- A level sill pan keeps water out of your home.
- The hinge side must sit perfectly plumb.
- Florida often requires a permit and an impact-rated door.
Can You Install French Doors Yourself?
Yes, but it’s an intermediate to advanced job that needs two people and most of the day.
Prehung units come with the jambs, hinges, and threshold built in. The doors are heavy, so you need a helper to lift and hold them. You also need steady hands for precise leveling. A simple interior swap is doable for many homeowners. An exterior impact set in Tampa is a tougher french door installation. Know your comfort with tools before you start.
| Detail | What to expect |
| Skill level | Intermediate to advanced |
| Time | 5 to 8 hours |
| Crew | Two people |
| Typical pro cost | $1,500 to $5,000+ |
What Tools and Materials Do You Need?
You need a level, drill, shims, pry bar, caulk gun, sill pan, and basic carpentry tools.
Set these out before you touch the old door:
- 4 to 6 foot level
- Shims
- Drill and driver
- Pry bar and utility knife
- Caulk gun and tape measure
- Finishing nails and long screws
For materials, grab a sill pan, flashing tape, exterior caulk, low-expansion foam, and trim. The sill pan matters most in Tampa, where heavy rain tests every seal. Skip it, and water sneaks under the threshold.
How Do You Measure for French Doors?
Measure the rough opening width and height at three points each, then order to the smallest reading.
Pull the inside trim off first so you can see the studs. Then take your numbers:
- Width: across the top, middle, and bottom
- Height: on the left, right, and center
- Order size: use the smallest reading from each set
Walls shift over time, so that smallest number keeps the fit safe. A clean french door installation starts with the right size. Order too wide, and you’ll be cutting framing on install day.
What Are the Steps to Install French Doors?
The job runs in seven stages, from pulling the old door to setting the lock and hardware. Follow these steps to learn how to install french doors without leaks or sticking.
Remove the Old Door
Take off the trim, then unscrew the old frame from the studs. Score the caulk so the wall and stucco stay clean. Lift the old unit out with your helper.
Prep the Opening and Set a Sill Pan
Check the studs and sill for rot or stucco cracks. Fix any damage first. Then lay a sill pan across the threshold, since it sends stray water back outside.
Set the Prehung Unit in Place
Run a thick bead of caulk on the sill. Center the unit and tilt it into the opening, bottom first. Rest the hinge side against the frame.
Shim and Plumb the Hinge Side
Slide shims behind each hinge point on the jamb. Check plumb with your level, top to bottom. Tack the shims with finishing nails as you go.
Plumb the Latch Side and Secure
Move to the latch jamb and shim it the same way. Check that the gap between both doors stays even. Drive long screws through the hinges into the studs.
Install the Astragal Bolts, Lock, and Hardware
Set the flush bolts on the inactive door’s astragal. Add the strike plates, lock, and handle. Test that each bolt slides in smoothly.
Seal, Insulate, and Trim
Fill the gaps with low-expansion foam only, since regular foam bows the frame. Caulk the outside edges. Add inside and outside trim for a clean look.
What’s Different About Exterior vs Interior French Doors?
Exterior French doors add weatherproofing like a sill pan and flashing that interior doors skip.
Interior French doors mostly need a plumb frame and a smooth swing. Exterior doors face rain, wind, and Tampa humidity every day. That’s why the sill pan and flashing tape matter so much outside. Swing direction counts too, since many Florida homes use in-swing impact doors.
| Feature | Interior | Exterior |
| Sill pan | Not needed | Required |
| Flashing tape | No | Yes |
| Impact glass | No | Common in Tampa |
| Permit | Rare | Usually yes |
What Mistakes Should You Avoid?
Most French door problems come from a frame that’s out of plumb or a missing sill pan.
Watch for these slip-ups that cause headaches later:
- Skipping the sill pan, so water gets under the threshold
- Setting the hinge side out of plumb, so doors swing on their own
- Letting the gap between the two doors run uneven
- Packing in too much foam, which bows the jamb
- Forgetting to seal the outside edges against rain
Get the hinge side plumb and the sill sealed, and the rest goes smoothly.
What Does Florida Code Require for French Doors?
Florida requires a permit and an impact-rated, code-approved door for most French door replacements.
A code-ready french door installation in Tampa means meeting a few rules. Here’s the short list:
- A full replacement needs a permit; small repairs often don’t.
- The door must carry Florida Product Approval or a Miami-Dade NOA.
- It has to meet the 130 mph wind rating.
- Jobs over $2,500 need a notice of commencement.
- An inspector checks the model number, screws, sealant, and flashing.
You can read the rules on the official Florida Building Code site. All four Tampa Bay counties follow them.
See how a licensed crew runs a full door installation, from the first measure to the final inspection.
Should You Install French Doors Yourself or Hire a Tampa Pro?
Do it yourself for a simple interior swap, but hire a pro for exterior impact doors, permits, or framing work. A light interior set is fine for a handy homeowner. Heavy impact glass is where most people want backup.
To be honest, the install gets harder the moment the weather and code rules come into play. Tampa sits in a high-wind zone, so exterior doors need impact glass and a permit. That is a lot to juggle on a weekend.
Call a Tampa pro when the job involves any of these:
- Impact glass doors: they are heavy and tough to lift and set straight.
- Permits and inspections: a pro handles these steps every day.
- Rot or stucco damage: a bad opening needs repair before the door goes in.
- New framing: widening the opening calls for the right tools and skill.
- Warranty rules: a pro install keeps your manufacturer warranty in one piece.
Conclusion
A solid french door installation keeps your home bright, sealed, and storm-ready for years. Want it done right the first time? The team at The Window Source of Tampa gives you a free in-home visit, its own crews, and full permit handling. Every job carries a lifetime limited warranty.
FAQ
How long does it take to install French doors?
A trained crew often finishes exterior French doors in a single day. A DIY job runs 5 to 8 hours with a helper and careful prep.
Do I need a permit for French doors in Tampa?
Yes, for a full replacement. The city wants a permit, an approved door, and a final inspection before you use it.
Can one person install French doors alone?
Not safely. The prehung unit is heavy and hard to balance. You need a second person to lift, center, and steady it.