Measure the rough opening, pull the old door and frame, square the opening, dry fit the new frame, shim and screw the hinge side, then the latch side and header, test the swing, and finish the trim.
A door that sticks in July and rattles in January usually has a bad jamb behind it. This guide shows you how to install a door frame the way our crew does it in Brownfield homes. Real numbers, no guessing.
TL/DR
- Measure and square first. Your rough opening needs 2 extra inches in both directions, and matching corner-to-corner numbers mean it sits square.
- Screw the hinge side before anything else, using 3-inch screws that reach the stud. Short box screws let the door sag inside a year.
- Hold a 1/8 inch gap around the top and sides, then seal with low-expansion foam only. Regular foam bows the jamb inward.
- Call a pro for load-bearing headers, rotted studs, or brick and stucco openings. DIY runs 4 to 6 hours inside, 8 to 12 outside.
What a Door Frame Is and What Holds It Together
A door frame is the wood box that holds your door and lets it swing. Three parts do the work. Two side jambs run up each side of the door. One header caps the top. A thin strip called the stop keeps the door from swinging past shut.
Frames on exterior doors add two more pieces. A sill sits at the bottom, and brickmould wraps the outside edge.
Tools and Materials You Need Before You Start
You need a tape measure, a 6-foot level, a drill, a hammer, a utility knife, a pry bar, shims, 3-inch screws, and low-expansion foam.
Lay everything out before you touch the old door:
- Tape measure and a 6-foot level
- Drill, screwdriver, and hammer
- Utility knife, chisel, and flat pry bar
- Circular saw or reciprocating saw
- Cedar shims, 3-inch screws, finish nails
- Low-expansion foam and caulk
How to Install a Door Frame Step by Step
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 your door works or sticks. Rush the measuring and you drive to Lubbock twice.
Step 1: Measure the Rough 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 the left, center, and right. Use the smallest number you get.
Step 2: Check If the Opening Is Square, Level, and Plumb
Measure corner to corner both ways, and matching numbers mean the opening sits square. Set your level on the floor of the doorway, then hold it against both studs. Older Brownfield homes shift as the clay soil dries out, so a lot of these openings sit off square. Fix it now. You cannot fix it later.
Step 3: Remove the Existing Door and Trim
Take the door off before you touch anything else. Pull the hinge pins with a screwdriver and a tap from your hammer. Score the paint line with a utility knife, then pry the trim off slowly from the bottom up. Going slow saves you from patching drywall all weekend.
Step 4: Dry-fit the New Frame
Place the frame in the opening with no screws in it yet. Center it side to side, then check that the jamb sits flush with the wall face. Pull it back out and mark whatever needs trimming.
Step 5: Shim and Fasten the Hinge Side First
Start on the hinge side every time, because that side sets how the door and frame work together.
Use shims in pairs behind each hinge spot. Check plumb with your level, then drive 3-inch screws through the shims into the stud. Use longer screws than the box gives you. Short ones grab trim wood only, and the door sags within a year.
| Hinge | Position |
| Top | About 7 inches down from the header |
| Middle | Centred between the other two |
| Bottom | About 11 inches up from the floor |
Step 6: Shim and Fasten 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 side jambs. A coin works well for checking the space between the door and jamb as you attach each screw. Do the latch side first, then the header.
Step 7: Test the Swing
Push the door halfway open and let go. A good frame holds it still.
- Swings open on its own, and your hinge side leans out
- Swings shut, and it leans in
Either way, loosen the screws, move the shims, and confirm the swing before you tighten down.
Step 8: Seal the Gaps and Finish the Trim
Cut the excess shim flush with a knife. Fill the gaps with low-expansion foam only. Regular foam pushes the jamb inward and bows it. Let it cure, trim it, then assemble the casing and nail it on. Fill the nail holes, sand, and paint.
Mistakes That Ruin a Door Frame Install
The five that cost people the most: an out-of-square opening, short screws, too many shims, high-expansion foam, and no sill pan.
Each one shows up months later, not on install day:
- Out-of-square opening: the door binds no matter how you shim it
- Short screws: the hinge side pulls loose, and the door drops
- Too many shims: the jamb bows and the gap goes uneven
- High-expansion foam: the jamb squeezes inward, and the latch misses
- No sill pan: water rots the subfloor under the threshold
You can watch a YouTube video for step-by-step instructions, but no video checks your opening. Measure yourself accurately.
When to Call a Pro Instead
Call a pro when the header carries weight, the studs rot, or the opening sits in brick or stucco. Cutting a load-bearing header wrong puts your roof at risk. Replace rotted framing before the new frame goes in.
Stop and pick up the phone if you find any of these:
- Soft or crumbling studs beside the jamb
- A header holding up a second floor or roof load
- Brick, stone, or stucco around the opening
- An opening that needs widening for a bigger door
- Daylight or water stains under the old threshold
- Any exterior door where you cannot lap the flashing right
How Long a Door Frame Install Takes
A DIY interior job runs 4 to 6 hours, and a pro finishes in about 2, while exterior work takes two to three times longer.
| Job Type | DIY Time | Pro Time |
| Interior door frame | 4 to 6 hours | 1.5 to 2 hours |
| Exterior door frame | 8 to 12 hours | 3 to 4 hours |
| Frame repair only | 2 to 3 hours | 1 hour |
Most of the door frame installation hours go into shimming, not lifting.
Get Your Door Frame Installed Right
Bad frames leak air, stick in the heat, and let dust through. Our Brownfield crew measures, sets, seals, and finishes the whole job in one visit. The Window Source of the South Plains backs every door frame installation with a lifetime warranty and a free in-home estimate. You just learned how to install a door frame. Skip the weekend work.
FAQs
Can I replace a door frame without removing the trim?
No. The trim hides the nails and shims holding the jamb. It comes off on every job. Score the paint line first with a utility knife. Careful prying lets you reuse the same casing.
How much space should sit between the door and frame?
Leave 1/8 inch on the top and both sides. Give the bottom about 1/2 inch for carpet clearance. A quarter makes a good spacer. Too tight and the door binds in July.
What screws hold a door frame best?
Anything that reaches the stud behind the jamb. Box screws only grab trim wood. Swap two per hinge for 3-inch versions. That one change stops most sagging doors we see in Brownfield.
Can one person install a door frame alone?
Yes for interior doors. Exterior doors weigh too much, so grab a helper. A steel or fibreglass entry unit can pass 150 pounds. Dropping one cracks the sill and the tile.
Why does my door stick only in summer?
Summer heat expands the door and the frame. A jamb set out of plumb makes that worse. Sticking at the top corner points to a sagging hinge side. A moved shim binds the latch edge.
Does installing a door frame need a permit?
Not for a simple swap in the same opening. Widening the opening or cutting a header does. Rules shift between Brownfield, Lubbock, and county land. One call to your building office settles it.