Check the code first, measure the door opening, square it, remove the old door, set the sill pan, dry fit the new unit, shim the hinge side, then the latch side and header, add the self-closing hinge, and finish the trim.
This guide covers the walk-through door between your garage and house, plus the exterior service door on the garage wall. Both jobs follow the same installation process. Around Brownfield and Lubbock, that door takes more heat and dust than any other door on the house. This Garage Entry Door Installation Guide walks you through it the way our crew does it.
TL/DR
- The house-side door must be solid wood, solid steel, or 20-minute fire-rated at 1-3/8 inches thick, and it has to close and latch on its own. Hollow-core doors fail every time.
- Your door opening needs about 2 inches of extra width and height, checked in three spots.
- Sill pan and flashing go in first, then shim the hinge side, hold a 1/8 inch gap, and use low-expansion foam only.
- Plan 4 to 6 hours for a house-side door, and call a pro for rotted framing, brick openings, or any widening job.
Garage Entry Door Installation Guide: The Nine Steps
Square the opening first, screw the hinge side before the latch side, and hold a 1/8 inch gap all the way around.
Those three rules decide whether the door works or sticks. Read the manufacturer sheet in the box before you start. A short video helps, but no video checks your own opening.
Step 1: Measure the Door Opening
Your rough opening needs about 2 inches of extra width and height.
| Door Size | Opening Width | Opening Height |
| 30 inch | 32 inches | 82 inches |
| 32 inch | 34 inches | 82 inches |
| 36 inch | 38 inches | 82 inches |
Measure the width at the top, middle, and bottom. Check the height on both sides and the centre. Use the smallest measurement you get.
Two numbers people forget:
- Jamb depth: A 2×4 wall takes a 4-9/16-inch jamb. A 2×6 wall takes 6-9/16 inches.
- Swing direction: Stand in the garage with the door swinging away from you. Hinges on your right mean a right-hand door.
Order the wrong hand, and the box goes back to the store.
Step 2: Check the Opening for squareness and plumbness
Measure corner to corner both ways, and matching numbers mean the opening sits square. Set your level on the floor, then hold it vertical against both studs. Garage slabs in Brownfield shift as the clay dries out. One side often runs low.
Fix what you find before the unit goes in:
| What You Find | What You Do |
| Slab low on one side | Shim the sill flat, then check again |
| Stud leaning inward | Add a shim stack behind the jamb |
| Corners off by more than 1/4 inch | Reframe the opening |
Step 3: Remove the Old Door and Trim
Take the door off before you touch the frame. Tap out the hinge pins with a screwdriver and hammer. Score the paint line, then pry the casing off from the bottom up. Going slow here helps you prevent wall damage.
Watch for two things behind the old jamb. Wiring for a light switch often runs right beside it. And a loose brick ledge under an exterior service door means the sill needs support before the new unit lands on it.
Step 4: Set the Sill Pan and flashing
Water protection goes in before the door does, and almost nobody does this part.
Work in this order:
- Clean the sill until nothing gritty is left
- Set the sill pan with the back leg tight to the framing
- Run flashing tape up both sides, then across the top
- Lap the top piece over the side pieces, never under
- Lay a full caulk bead behind the brickmould last
Water runs downhill, so every layer above has to overlap the one below. Skip this and the bottom of the jamb rots inside two or three seasons.
Step 5: Dry-fit the New Unit
Set the unit in the opening with no screws in it yet. Centre it side to side, then check that the jamb sits flush with the wall surface. Confirm the door swings clear of the slab. Open and close it a few times while somebody holds the frame steady.
Pull it back out and mark anything that needs trimming. A jamb sitting proud of the drywall by 1/4 inch will fight your casing later on.
Step 6: Shim and Fasten the Hinge Side
Start on the hinge side every time, because that side sets how the door swings. Slide shim pairs behind each hinge spot, pushed in from both directions so the pressure stays even. Check plumb, then mount 3-inch screws through the shims into the stud. Short screws grab trim wood only, and a steel door pulls loose within a year.
| Hinge | Position | Screws |
| Top | About 7 inches down from the header | Two 3-inch, one standard |
| Middle | Centered between the other two | One 3-inch |
| Bottom | About 11 inches up from the floor | Two 3-inch, one standard |
A solid steel door runs 80 pounds or more. Those long screws carry all of it.
Step 7: Shim the Latch Side and header
Hold a 1/8 inch gap all the way around the door.
Shim behind the strike plate, then at the top and bottom of the jambs. A coin works well for checking that gap. Adjust as you go, then secure the latch side and header firmly.
Check your gap in three spots before you tighten anything down:
- Top of the latch edge
- Middle, right at the strike plate
- Bottom of the latch edge
An uneven gap means a shim moved. Back the screw off and reset it.
Step 8: Install the Self-Closing Hinge and Latch
Swap one standard hinge for a spring or hydraulic self-closing hinge. Most units put it in the top spot. Pick the type that fits your house:
| Hinge Type | How It Works | Best For |
| Spring | Adjustable tension pulls it shut | Tight budgets |
| Hydraulic | Damped arm closes it slowly | Homes with small kids |
Open the door all the way and let go. It has to shut and latch every time, on its own. Test it three times, because a hinge that works once and fails twice still fails inspection.
Step 9: Seal, Insulate, and Trim
Cut the shims flush, then fill gaps with low-expansion foam only. Regular foam bows the jamb inward and ruins your gap. Let the foam cure fully before you cut it back. Add weatherstripping around the frame and a sweep along the bottom.
The sweep matters more here than most places. Fine dust off Terry County fields finds any gap under a door. Nail the casing on, fill the holes, and paint. That finishes the garage door installation on your walk-through door.
Which Garage Entry Door This Guide Covers
This guide covers the passage door into your house and the service door on the outside garage wall, not the big overhead door. Three doors share the same name, and people mix them up all the time:
| Door | Where It Sits | Covered Here? |
| Passage door to the house | Shared interior wall | Yes |
| Service door, sometimes called a man door | Outside garage wall | Yes |
| Overhead sectional door | Front of the garage | No |
Overhead garage doors run on tracks with springs under heavy load. That work is dangerous, so call a garage door professional for it.
What Code Requires for a Garage Entry Door
The door between your garage and house must be solid wood, solid or honeycomb-core steel, or 20-minute fire-rated at 1-3/8 inches thick minimum.
Fire spreads from a garage fast. Code treats this one door as a wall.
| Door Type | Minimum Thickness | Passes? |
| Solid wood | 1-3/8 inch | Yes |
| Solid or honeycomb-core steel | 1-3/8 inch | Yes |
| 20-minute fire-rated | Per label | Yes |
| Hollow-core interior | Any | No |
The Self-Closing and Self-Latching Rule
The door has to swing shut on its own and latch on its own. No push from you.
The Bedroom Rule
A garage cannot open straight into a bedroom. That rule holds no matter which material you pick.
Older Homes and Local Rules
Self-closing entry doors entered the code in 2012. Homes built before that may not have needed it. Texas cities adopt different code editions, so call your building office to verify what applies at your location.
Tools and Materials You Need
Grab a tape measure, level, drill, hammer, pry bar, shims, 3-inch screws, sill pan, flashing tape, foam, and a self-closing hinge.
Lay every tool out before you start:
- Tape measure and a 6-foot level
- Drill, screwdriver, and hammer
- Utility knife, chisel, and flat pry bar
- Reciprocating saw for old fastener heads
- Cedar or plastic shims, 3-inch screws
- Sill pan, flashing tape, low-expansion foam, caulk
- Self-closing hinge
Mistakes That Fail a Garage Door Inspection
Five errors fail almost every inspection: a hollow-core door, no closer, a bad latch, a pet door, and a floor gap.
Each one gets written up on the spot:
- Hollow-core door: fails on thickness alone
- No self-closing device: fails even with the right door
- Latch that will not catch: fails as a full assembly
- Pet door cut into it: breaks the fire separation
- Gap under the slab: lets fumes into the house
How Long a Garage Entry Door Install Takes
A house-side door runs 4 to 6 hours DIY and about 2 for a pro, while a service door takes longer.
| Job | DIY Time | Pro Time |
| House-side passage door | 4 to 6 hours | 2 hours |
| Outside service door | 6 to 10 hours | 3 hours |
| Self-closing hinge only | 30 minutes | 15 minutes |
Most of the garage entry door installation hours go into shimming, not lifting.
Let Our South Plains Crew Put In Your Garage Entry Door
Failed your home inspection? We fix that in one visit. Our Brownfield team measures, sets the door, seals the gaps, and cleans up. Every garage entry door installation from The Window Source of the South Plains comes with a lifetime warranty and a free in-home estimate.
FAQs
Can I use a regular interior door between my garage and house?
No. Hollow-core doors fail code. You need solid wood, solid steel, or a 20-minute fire-rated door at 1-3/8 inches minimum.
What is the rough opening for a 36-inch garage entry door?
About 38 inches wide and 82 inches tall. Measure your own opening in three spots before you order anything.
Does replacing a garage entry door need a permit?
Usually not for a same-size swap. Widening the opening or cutting a header does. One call to your building office settles it.
Which way should a garage entry door swing?
Into the house on most builds. That keeps the door clear of cars and gives the closer room to work correctly.