How to Make an Exterior Wood Door (Step-by-Step + Wood Types)

An exterior wood door is built from 1-3/4 inch stock, not 2x4s: stiles and rails joined with haunched mortise-and-tenon joints, floating panels, and a finish on all six sides. Skip the waterproof glue or the panel clearance and the joints open or the stiles crack within a season. This guide covers wood choice, dimensions, joinery, clearances and finishing.

How to Make a Door: Step-by-Step Overview

Here is the nuance most short guides skip. Dimensional lumber is the wrong starting point: a nominal 2×4 or 2×6 is 1-1/2 inches thick, and an entry door is usually 1-3/4 inches thick. Start with 8/4 hardwood or cedar and mill it down.

1. Measure the opening: measure the jamb width and height at the top, middle and bottom and use the smallest number. Subtract about 3/16 in. per edge for clearance.
2. Select and mill the stock: choose a rot-resistant species, and mill 8/4 lumber flat and square to 1-3/4 in. thick. Let it rest in a space with similar humidity to the install location before final cuts.
3. Cut the stiles and rails: cut two stiles to the full door height and rails to the width between stiles plus tenon length on each end.
4. Cut the mortises, grooves and tenons: chop the mortises in the stiles, plow a 1/4 in. panel groove along the inside edges, then cut haunched tenons on the rail ends.
5. Dry-fit and glue: dry-fit the whole frame first, then glue each joint with a waterproof glue and clamp the frame flat and square.
6. Fit the floating panels: slide the panels into their grooves before the last joint is glued, and do not glue the panels in place.
7. Sand the door: sand with the grain from 100 grit to 150 and then 220 grit, and remove dust before finishing.
8. Finish all six sides: coat the faces, both edges, the top and the bottom edge before hanging the door.
9. Hang the door: fit it to the opening with even clearance and hang it on three heavy-duty exterior hinges.

Selecting The Right Wood

Species decides how long the door lasts, and the biggest trap is assuming every oak is an exterior wood. It is not. The Wood Database rates white oak as very durable, and red oak as non-durable to perishable with large open pores that let water in. Buy by species, not by the word “oak”.

Species	Janka hardness	Rot resistance	Watch for
White oak	1,350 lbf	Very durable	Fairly high shrinkage; reacts with iron when wet and stains
Red oak	1,220 lbf	Non-durable to perishable	Open pores soak up water; not for exterior doors
Honduran mahogany	900 lbf	Moderately to very durable	Very stable, but CITES Appendix II listed; look for plantation stock
Western red cedar	350 lbf	Durable to very durable	Dents easily; iron fasteners can stain it

Source: Wood Database pages for white oak, red oak, Honduran mahogany and western red cedar. Hardness and durability ratings are the Wood Database values.

Mahogany is the stability pick and cedar is the budget, easy-to-work pick, though at 350 lbf it dents under a doorknob or a dropped tool. White oak is the strong choice but moves more with humidity, so it needs generous panel clearance. See how to identify mahogany before you pay mahogany prices, and our guide to wood for door frames for the jamb side of the project.

Designing Your Door

Choose solid panel, raised panel or glass before cutting. Raised panels need a panel-raising bit; our raised panel door calculator gives cut sizes. Glass inserts need a separate rabbet and exterior-rated glazing, and the glass should be tempered safety glass.

Part sizes vary with the design. In the Woodweb thread on a large cedar door, a 42 by 89 inch, 1-3/4 inch thick door used five rails 5 to 7 inches wide. Draw the door full size with every stile, rail and panel labeled before you mill anything.

Gathering Your Tools And Materials

Tools: table saw, router or mortising setup, miter saw, four or more long clamps, speed square, chisels and a sander. Materials: 8/4 lumber, moisture-resistant glue, panel stock, stainless or coated fasteners (the Wood Database notes iron fasteners can stain cedar and react with white oak), and an exterior finish.

Preparing The Wood

Mill every piece to the same 1-3/4 inch thickness so the faces sit flush after glue-up. Stiles can be left an inch or two long until after assembly to avoid splitting during joinery, a tip from Fine Woodworking.

Joinery: Haunched Mortise And Tenon

A door frame is joined with mortise and tenon. The Fine Woodworking author uses haunched through-tenons: the haunch fills the groove gap at the end of the stile, so the panel groove can run the full length instead of being stopped. Our mortise and tenon joint guide covers the sizing rules in more depth.

Joint detail	Figure	Source
Panel groove	1/4 in. wide by 1/4 in. deep	Tom Caspar, Popular Woodworking
Door tenon length	At least 1 in.; one door-maker cites 2 in. as the usual choice	Popular Woodworking; Woodweb thread
Mortise width in the Fine Woodworking build	5/16 in. (cut with a 1/4 in. auger bit)	Fine Woodworking
Right fit	Pushes in by hand; a gap wider than notebook paper is too loose	Tom Caspar, Popular Woodworking

On joint fit, Tom Caspar in Popular Woodworking gives a simple test: if you have to pound the rail into the mortise it is too tight, and if the gap is wider than a sheet of notebook paper it is too loose. Longer tenons help on a heavy exterior door; the Woodweb thread on a large cedar door landed on tenons well over 3 inches for an 89 inch door.

Assembling The Door Frame

Use a moisture-resistant glue on every joint. Titebond III is rated Type I for water resistance and has an open time of about 8 to 10 minutes, with roughly 30 minutes of clamping and 24 hours before you stress the joint, according to retailer and manufacturer listings. Standard interior yellow glue is the wrong choice for an exterior door. See our guide to gluing wood joints for outdoor use.

Open time sets the pace. Dry-fit the entire frame first, label each joint, and glue one end of each rail at a time. Clamp from the center outward and check the diagonals; any racking now becomes permanent. Slide the panels into their grooves before the final joint closes.

Attaching The Panels

Do not glue the panels. A floating panel can expand and contract inside the groove, while a glued panel can split or crack the frame. A contributor in the Woodweb thread says the same: use a moisture-resistant glue on the joints and let panels move on their own. Also finish the panel edges before assembly, so a shrinking panel does not reveal a raw strip of unfinished wood.

For panel clearance, leave a small gap at the bottom of each groove so the panel can swell. About 1/8 inch per edge is a common rule of thumb; our wood movement calculator can help size the gap for your species and width.

Finishing Touches

Sand with 100 grit to remove mill marks, then 150 and 220 grit with the grain. Then finish every surface. Simpson Door states that all six sides of every door must be coated, and calls for at least three clear top coats on a stained door, or primer plus two paint top coats. The same coatings go on the top and bottom edges, plus a surface-mount drip cap on the bottom.

Porch overhang rule: Simpson Door recommends an overhang that projects out from the wall a distance equal to half the height from the bottom of the door to the bottom of the overhang. If the overhang sits 96 inches above the bottom of the door, that means 48 inches of projection. This is a manufacturer guideline for its own doors, but it is a useful target for any exterior wood door. For product choices, see our best wood sealer guide and weatherproofing guide.

Fitting The Door To The Opening

Simpson Door advises roughly 3/16 inch of clearance for swelling when the door is installed in fully dry conditions. Applied to each door edge, that means a 36 inch wide opening takes a door about 35-5/8 inches wide (36 minus 3/8). Measure the opening at three heights, use the smallest number, and plane to a scribe line. Re-seal any bare edge you trim.

Hanging The Door

Hang the door on three heavy-duty exterior hinges: one about 7 inches from the top, one about 11 inches up from the bottom, and the third centered between them. Mortise hinge leaves flush with a sharp chisel, since hinges sitting proud make the door bind. Use long screws, at least 3 inches on the top hinge, so they bite into the framing and not just the jamb. If the frame is out of square, see how to fix a door frame first.

Ledged And Braced Plank Doors: A Simpler Option

If your goal is a shed, gate or barn door, a ledged and braced plank door is simpler than a frame-and-panel door and tolerates basic tools. Vertical tongue-and-groove boards are held by horizontal ledges and a diagonal brace. The brace must rise from the hinge side at the bottom toward the latch side at the top, so the door weight is carried down through the brace into the hinge post. A brace sloping the other way lets the door sag.

The tongues do not need to be glued, which lets the boards move. Fasten the boards to every ledge and brace with exterior-rated screws or nails. This is the honest answer to the common search for how to make a door with 2x4s: a plank door can be built from common boards, but a standard entry door cannot.

Maintenance Tips

Check the finish each year. Re-coat at the first sign of checking, cracking or gray weathering, and scuff-sand lightly between coats. Watch the bottom edge: it takes the most splash from rain and the threshold. Use a re-coat product that is compatible with the existing finish.

Safety Considerations

Wear eye and hearing protection around power tools and unplug the tool before changing blades or bits. Feed stock against the rotation of the router bit, never with it. Oil-based finishes and mineral spirits are flammable, so work with ventilation away from open flame, and lay oily rags flat to dry outdoors rather than balling them up, since they can heat and ignite.

Troubleshooting Common Issues

The door will not close flush: check hinge mortise depth and that the door is square. If it binds at the top, see why a door sticks at the top. Warping after install usually traces to an unfinished bottom edge or uneven finish coats front and back: remove it, seal every surface and rehang. A cracked panel usually means it was glued or had no room to move.

Keep reading

• Best Wood for Door Jambs: Interior vs. Exterior Guide
• How to Refinish a Wood Door (Interior vs. Exterior Steps)
• How to Repair a Damaged Wooden Door (Cracks, Rot & Warping)

Frequently Asked Questions

What Is the Best Wood for Making Exterior Doors?

White oak, mahogany and western red cedar are the usual picks. According to the Wood Database, white oak is rated very durable, Honduran mahogany moderately to very durable with very good stability, and western red cedar durable to very durable. Avoid red oak: the same source rates it non-durable to perishable.

What Size Is a Standard Exterior Door?

Entry doors are commonly 1-3/4 inches thick, and 36 by 80 inches is the common single-door size. For a replacement, size the door to your own opening, not the standard: allow about 3/16 inch of clearance per edge, so a 36 inch wide opening takes a door about 35-5/8 inches wide.

How Do I Weatherproof a Wood Exterior Door?

Finish all six sides before or immediately after hanging: both faces, both edges, the top and the bottom. Simpson Door calls for at least three clear top coats on a stained door, or primer plus two top coats of paint, with the same coatings on the top and bottom edges. A drip cap on the bottom edge helps shed water.

Can I Make an Exterior Door From 2x4s?

Not a standard entry door. A nominal 2×4 or 2×6 is only 1-1/2 inches thick, so it cannot reach the usual 1-3/4 inch door thickness. A ledged and braced plank door suits shed, gate or garage use: vertical boards held by horizontal ledges and a diagonal brace that rises from the hinge side.

What Tools Do I Need For Making Wood Doors?

A table saw, a router or mortising setup for the joints, a miter saw or crosscut sled, at least four long clamps, a square, a chisel set and a random-orbit sander. A router table with a panel-raising bit is only needed for raised panels. Wear eye and hearing protection.

How Long Does It Take To Make A Wood Door?

Plan on a long weekend for a first frame-and-panel door: milling and joinery in one or two days, then glue-up. Finish drying adds more time, because each coat needs to dry before the next and the exact time depends on the product label. Hanging and fitting can be done in an afternoon.

Can I Install Wood Doors Myself?

Yes, if you can chisel hinge mortises accurately and check the frame for square. Fit the door with even clearance, mortise the hinges flush and drive screws long enough to reach the framing. If the jamb itself is racked, fix it first before hanging a new door.

Conclusion

Build an exterior door from 1-3/4 inch stock with haunched mortise-and-tenon joints, a waterproof glue and floating panels. Choose white oak, mahogany or cedar over red oak, leave about 3/16 inch of clearance at the edges, and seal all six sides before hanging. Figures in this guide come from the cited sources; we did not build a test door for this update.