Short answer
Farmhouse door trim is flat casing, often a 1x4 (3-1/2 in), with a butted head board laid across the tops of the legs. Many versions stand the legs on plinth blocks. It suits painted white trim or wood that shows its grain and knots, and every cut is square.
What makes it farmhouse
- Flat stock. No profile, just a board with eased or square edges.
- Butt joints. The head sits square on the legs, usually a little wider and sometimes thicker.
- Plinth blocks. A block at the foot of each leg gives the baseboard something to stop against (This Old House).
- Honest material. Painted white, or wood with visible grain and knots.
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01Painted
Primed flat 1x4 boards
Best for: white painted farmhouse trim
- Size
- 3/4 x 3-1/2 in
- Material
- Primed MDF or pine
- Edges
- Square or eased
- Cheapest way to trim a lot of doors
- Primed finger-joint pine is the better pick for bathrooms and laundry rooms
- Sight down each board; flat stock shows a bow
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02Kit
Farmhouse door trim kit
Best for: one or two doors without a table saw
- Pieces
- Legs and head
- Joint
- Butt
- Finish
- Primed or raw
- Pieces cut to standard door sizes
- Some kits include plinth blocks; check the contents
- Confirm whether a kit trims one side or both
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03Add-on
Plinth blocks
Best for: finishing the bottom of the legs
- Height
- Taller than baseboard
- Width
- A bit wider than casing
- Thickness
- Thicker than both
- Sized so casing and baseboard both die into the block
- Plain blocks suit farmhouse; carved ones lean Victorian
- Buy them before cutting the legs, which get shorter
Build it in an afternoon
- Set the plinths (if using): square to the floor, 3/16 in back from the jamb edge like the casing.
- Cut the legs square, from the top of the plinth (or the floor) to the head jamb plus the 3/16 in reveal.
- Cut the head to the outside width of the legs plus a small overhang each side, if you like the look.
- Nail into the jamb edge and the framing behind the drywall. Glue the head to the leg tops.
- Finish: fill, caulk to the wall, and paint; or sand and stain solid wood.
Sizing rules for blocks are on the rosettes and plinth blocks page. Lengths for every door in the house: casing calculator. Looking for variations? See door molding ideas.
Questions people ask
What is farmhouse style door trim?
Simple, straight-lined casing made from flat boards, joined with butt joints rather than miters. This Old House notes it often shows wood grain and natural knots, and that setting the legs on plinth blocks is a bolder option.
What size boards for farmhouse trim?
Most use 1x4 boards, which measure 3/4 by 3-1/2 inches, for the legs, and a 1x4 or 1x6 for the head. A wider head than leg gives the classic look.
Can farmhouse trim be stained?
Yes, if you use solid wood such as pine. MDF and finger-joint pine are for paint only. Knotty pine boards suit a rustic stained look.
Sources
Last reviewed October 12, 2026. Profiles, sizes and listings change; check the product details before you buy, and follow the maker’s instructions.