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How to build shed doors that won’t sag: measure the finished opening, subtract small gaps, build each door on a flat surface with a frame and diagonal braces that run from the bottom hinge corner up to the top latch corner, then hang it on three hinges set over solid frame boards.

The cut sizes below come from the door openings in our 3DSHEDPLANS plans.

How to build shed doors: parts and materials

A wood shed door has three layers. The skin is the face you see, usually 5/8 in T1-11 siding to match the walls, or exterior plywood. The frame is boards glued and screwed to the back of the skin. The braces are diagonals inside the frame that stop the door from racking into a parallelogram.

Common builds:

  • Z-brace door. Skin, a top and bottom rail and one diagonal. Light and cheap, fine for a small single door up to about 30 in wide.
  • Framed door. Two stiles (the long sides), a top, middle and bottom rail, and a diagonal in each bay. The rails give every hinge solid wood behind it. This is the build in the steps below.
  • Board and batten. 1×6 tongue and groove boards held by rails and braces instead of a sheet.

Use 1×4 frames for doors up to 30 in wide. Wider or taller than that, frame with 2×4 laid flat (a common build for big shed doors) or 1×6 rails, and use 8 in hinges. A door around 38 x 80 in takes two people to hang.

Heavy T-hinges are the usual pick: the long strap spreads the load across the door. Small butt hinges are not made for a heavy shed door.

Materials for the double door in our 10×12 gable plan, two doors at 29 x 75 1/8 in each:

Part Material Quantity
Skins T1-11 cut from the wall opening, or 5/8 in T1-11 2 pieces
Stiles, rails, braces 1×4 x 8 ft (includes 2 spares) 10 boards
Jambs 1×6 x 8 ft, ripped to width 3 boards
Stops and center strip 1×2 x 8 ft and 1×3 x 8 ft 3 and 1
Hinges 6 in heavy T-hinges, exterior-rated 6
Hardware 2 cane or slide bolts, hasp, handle, 10 carriage bolts with nuts, drip cap, door sweep 1 set
Fasteners about 100 x 1 1/4 in and 30 x 2 1/2 in exterior screws, exterior glue as listed
Finish exterior primer and paint all faces and edges

A rough estimate is $100 to $250 for the pair with hardware. It varies by region and lumber prices; reusing the wall cutout saves most of the siding cost.

Tools: circular saw, straightedge, drill driver, tape, speed square, level, clamps and a block plane.

How big should each shed door be?

Start from the finished opening, not the rough opening. The rough opening is the hole in the framing, between the jack studs and under the header. Line it with jambs 3/4 in thick and the finished opening is 1 1/2 in narrower and 3/4 in shorter.

Then subtract the gaps. A common target is 1/8 in at the top and each side, 1/4 in between two doors and 1/2 in at the bottom. Wood swells across the grain as it takes on moisture, as the USDA Wood Handbook explains, so a door cut tight in dry weather binds in a wet season.

Cut sizes for five of our plans, with 3/4 in jambs and those gaps:

Plan Door type Rough opening (W x H) Finished opening Each door (W x H)
8×8 gable Single 27 x 68 in 25 1/2 x 67 1/4 in 25 1/4 x 66 5/8 in
10×10 gable Single 39 x 76 1/2 in 37 1/2 x 75 3/4 in 37 1/4 x 75 1/8 in
10×12 gable Double 60 x 76 1/2 in 58 1/2 x 75 3/4 in 29 x 75 1/8 in
8×16 lean-to Double 60 x 72 in 58 1/2 x 71 1/4 in 29 x 70 5/8 in
12×16 gable Double 78 x 82 in 76 1/2 x 81 1/4 in 38 x 80 5/8 in

Frame the 10×10 and 12×16 doors (over 30 in wide) with 2×4 laid flat or 1×6 rails. Measure your own framed opening at the top, middle and bottom and use the smallest number.

How to build a shed door step by step

  1. Prime first. Prime the back of the skin and all frame boards before assembly.
  2. Cut the skin and check it. Cut the T1-11 with the saw and a straightedge, then measure both diagonals. They should match within 1/8 in. On a double door, line the grooves up with the walls.
  3. Lay the frame on the back. Put the skin face down on a flat surface. Set the stiles full length on both long edges, then fit the top, bottom and middle rails between them. Put the middle rail at handle height, about 36 in up, so the hasp lands on wood.
  4. Glue and screw from the back. Drive 1 1/4 in screws through the frame into the skin every 6 to 8 in (2 in screws through a 2×4 frame), so no heads show on the face. Pre-drill board ends.
  5. Fit the braces. In each bay, run a 1×4 from the bottom corner on the hinge side to the top corner on the latch side, seated tight into the rail and stile corners. Glue and screw.
  6. Paint. Finish the front and all four edges, then hang.

Face down, the hinge side is on the opposite hand from how you will see it in the wall. Mark “HINGE” on that stile before you cut a brace. On a double door, the two doors’ braces mirror each other.

Which way does the brace go?

The diagonal runs from the bottom corner on the hinge side up to the top corner on the latch side. The latch side of a hung door wants to drop. A brace in that direction pushes the latch corner up, so the wood works in compression.

Run it the other way and the brace works in tension, held only by its screws. Those loosen, and the latch corner drops onto the floor. A steel cable is the reverse: it goes from the top hinge corner to the bottom latch corner, because a cable can only pull.

How to hang a shed door

Set up the opening. Rip the jambs from 1×6 so their outside edges finish flush with the face of the trim around the door (about 4 7/8 in on a 2×4 wall with 5/8 in siding and 3/4 in trim). The T-hinge leaf then lands flat on the trim.

Place the hinges. Use three per door, each strap centered on a rail: top, middle and bottom. Screw them to the frame, and swap one screw per strap for a carriage bolt through the door so the hinge cannot be unscrewed from outside.

Fasten into framing. On the wall side, drive 2 1/2 in exterior screws through the trim and siding into the jack stud. Where a screw or bolt touches pressure-treated wood, use hot-dip galvanized or stainless. The American Galvanizers Association explains why those two are the usual choice in treated lumber and why you should not mix them.

Hang and stop it. Set the door on 1/2 in shims with 1/8 in spacers at the top and sides, screw the hinges, then pull the shims and test the swing. Nail 1×2 stops to the jambs and head, set back from the jamb edge by the door thickness plus 1/16 in (1 3/8 in for a door with a 1×4 frame). Add a door sweep if mice or blowing rain are a problem.

Double doors: bolts, center strip and lock

On a pair, one door stays shut and closes first. Hold it with a cane bolt or slide bolt at the bottom into a hole in the floor or sill, and another at the top into the header.

Screw a 1×3 strip to the outside face of the active door, along its meeting edge, so it overlaps the shut door by about 3/4 in when closed. Mount the hasp across that strip on the middle rails and through-bolt it with carriage bolts. A single door gets the same hasp, latching to the trim.

Keeping water out at the top and bottom

Over the head trim, tuck a metal drip cap or Z-flashing under the siding above so water steps out past the trim. APA’s Z-flashing detail for APA Rated siding shows the same lapped flashing at a siding joint.

The bottom edge is where shed doors rot. Panel edges soak up water much faster than the faces, so paint that edge twice and keep the 1/2 in gap so it never sits in a puddle.

Should a shed door swing in or out?

Out, in most cases: it keeps the floor clear and rain on the face runs outside. Add a hook so wind cannot slam an open door into the wall, and swing it in only where snow drifts block that wall. Short on swing room? A sliding barn-style door on a top track needs clear wall beside the opening as wide as the door, and solid blocking behind the track.

Mistakes, and fixing a door that sags or sticks

  • Brace pointing the wrong way. A common cause of a sagging shed door.
  • No stops. The door swings past the jamb and the gap lets weather in.
  • Hinges on bare skin. Screws in 5/8 in siding alone work loose within a season.
  • Unpainted bottom edge. The skin swells and the plies separate.

To fix a sagging door, first replace each hinge screw with a longer one that reaches framing. If the door itself has racked, fit an anti-sag kit, sold at hardware stores: a cable and turnbuckle from the top hinge corner to the bottom latch corner. Tighten until the door clears the floor. It is a repair, not a substitute for a correct brace.

A door that sticks only in wet weather has swelled. Wait for a dry spell, plane the rubbing edge with a block plane, and paint the bare wood the same day.

What we checked: wood movement and edge absorption from the USDA Wood Handbook, fastener metals from the American Galvanizers Association, flashing from APA. Door openings come from our plan pages; the gaps are common builder practice, not a standard.

Plans that fit

Each 3DSHEDPLANS plan PDF has 3D framing views of the walls, door opening and header included, plus a full material list. To see one before you buy, download the free 10×12 gable preview PDF.

See what size shed you need, the shed material list guide and how to winterize a shed, or browse all gable shed plans, lean-to shed plans and the full set of 3DSHEDPLANS shed plans.

Frequently asked questions

How do you build an inexpensive shed door?

Use the T1-11 panel you cut out of the wall for the door opening as the door skin, so the grooves line up with the wall. Glue and screw a 1×4 frame and diagonal braces to the back, then hang it on three exterior-rated T-hinges.

Should a shed door swing in or out?

Most shed doors swing out. That keeps the floor inside clear and lets rain run off the door face to the outside. Swing it in only where snow drifts block that wall each winter, and leave the floor space the door sweeps empty.

What wood is best for a shed door?

Match the walls: 5/8 in T1-11 siding or exterior plywood for the skin, with a frame of straight, dry 1×4 boards, or 2×4 laid flat for wide doors. Board and batten doors use 1×6 tongue and groove boards instead of a sheet. Prime and paint every face, including the edges.

How thick should a shed door be?

A framed T1-11 door with a 1×4 frame on the back is about 1 3/8 in thick. Add 1×4 trim on the front as well and it reaches about 2 1/8 in. Size your hinge screws and the door stops to that thickness.

How do you fix a sagging shed door?

Replace loose hinge screws with longer ones that reach the frame and the trimmer stud. If the door has racked, add an anti-sag kit: a steel cable and turnbuckle from the top hinge corner to the bottom latch corner. Tighten until the door clears the floor.

Shed building guides