Over Door Decorative Molding: Size It to Your Ceiling
Over door decorative molding is any trim added above a door's head casing: a projecting cap called a crosshead, a pediment, a rectangular overdoor panel or an arch. Which one fits depends on a single measurement, the space between the top of the head casing and the ceiling, which is about 13 in on a standard 8 ft wall and 25 in on a 9 ft wall.
To carry the same detail across the rest of the wall, see our decorative wall molding kits, pre-cut to your wall size.
Most results for over door decorative molding are product photos of pediments with no hint of whether they fit your door. They also skip the alignment rules that make the detail look original to the house. This guide works from the measurement: how much space you have, which detail suits it, how wide it should be relative to the casing, and a worked 9 ft example using our over door decorative molding option, a pre-cut MDF arch.
Quick answer: Measure from the top of the head casing to the ceiling. Under 10 in, add a crosshead cap. From 10 to 18 in, use a slim overdoor panel; 18 to 30 in suits a taller panel, a pediment or a half-round arch. Match the detail's width to the outer edges of the casing, 37.5 in for a 32 in door.
Key takeaways
- On an 80 in door with 2.25 in casing, the head casing tops out near 82.75 in, leaving 13.25 in below an 8 ft ceiling.
- The same door under a 9 ft ceiling leaves 25.25 in, enough for an overdoor panel or a half-round arch.
- An overdoor element looks original when its edges line up with the casing's outer edges, or overhang by the same amount on both sides.
- A half-round arch rises half its width: an arch matching 37.5 in casing needs 18.75 in of height.
- Leave at least 3 in between any overdoor detail and the ceiling or crown.
How much space is there above your door?
Space above door = ceiling height minus head casing top. For a standard 80 in door with a 3/4 in head jamb, a 1/4 in reveal and 2.25 in casing, the casing top sits at about 82.75 in. Measure yours, since floors and jambs vary, then subtract any crown molding depth from the ceiling height.
| Ceiling | 80 in door, 2.25 in casing (top 82.75 in) | 80 in door, 3.5 in casing (top 84 in) | 96 in door, 3.5 in casing (top 100 in) |
|---|---|---|---|
| 8 ft (96 in) | 13.25 in (34 cm) | 12 in (30 cm) | Not applicable |
| 9 ft (108 in) | 25.25 in (64 cm) | 24 in (61 cm) | 8 in (20 cm) |
| 10 ft (120 in) | 37.25 in (95 cm) | 36 in (91 cm) | 20 in (51 cm) |
Casing top = door height + 0.75 in head jamb - 0.25 in reveal + casing width. If there is crown molding, subtract its height on the wall from the space.
Which over door decorative molding fits the space?
Pick the detail by the measured space, then style. Small spaces take horizontal details that sit on the casing; medium spaces take a framed panel; tall spaces can carry an arch or a pediment. Forcing a tall pediment into 12 in makes it crash into the ceiling, which reads as a mistake.
| Space above casing | Best detail | Typical size | Look |
|---|---|---|---|
| Under 10 in (25 cm) | Crosshead or header cap | 3 to 6 in tall, 1 in overhang each side | Classic, farmhouse |
| 10 to 18 in (25 to 46 cm) | Slim overdoor panel frame | Height = space minus 6 to 7 in | French, transitional |
| 18 to 30 in (46 to 76 cm) | Overdoor panel, half-round arch or pediment | Arch rise = half its width | Traditional, Parisian |
| Over 30 in (76 cm) | Arch frame, or casing plus panel stacked | Keep 3 in to ceiling | Formal, tall rooms |
Ready-made pediments are sold by height, so compare the listed height plus 3 in of clearance with your measured space before ordering. A pediment is the classical gable shape; interior versions are usually a low segment arch or triangle.
How wide should over door molding be?
Line the overdoor detail up with the outer edges of the door casing. For a 32 in door with 2.25 in casing that is 37.5 in. Caps and pediments can overhang the casing by 1 in on each side; framed panels and arches should match the casing edges exactly or sit inside them by an equal amount.
| Door width | Casing outer width, 2.25 in casing | Crosshead width (1 in overhang) | Half-round arch rise at casing width |
|---|---|---|---|
| 28 in | 33.5 in | 35.5 in | 16.75 in |
| 30 in | 35.5 in | 37.5 in | 17.75 in |
| 32 in | 37.5 in | 39.5 in | 18.75 in |
| 36 in | 41.5 in | 43.5 in | 20.75 in |
Casing outer width = door + 2 x 0.75 in jamb - 2 x 0.25 in reveal + 2 x casing width.
Worked example: an arch over a 32 in door on a 9 ft wall
A 32 in door with 2.25 in casing under a 108 in ceiling leaves 25.25 in above the head casing. A half-round arch as wide as the casing, 37.5 in, rises 18.75 in, leaving 3 in below it and 3.5 in above. Our 96 cm (37.79 in) MDF arch width is within 0.3 in of the casing.
- Casing outer width: 32 + 1.5 - 0.5 + 4.5 = 37.5 in.
- Head casing top: 80 + 0.75 - 0.25 + 2.25 = 82.75 in; space to ceiling 108 - 82.75 = 25.25 in.
- Arch rise for a half-round at 37.5 in: 37.5 / 2 = 18.75 in.
- Gaps: 3 in from casing to arch base, leaving 25.25 - 3 - 18.75 = 3.5 in to the ceiling.
- Arc length of the outer curve: pi x 37.5 / 2 = 58.9 in of curved molding.
- Kit: our MDF arched kit in the 96 cm width is $86.40 for one panel; for an arch top without legs, or a different rise, contact us for a custom cut.
On an 8 ft ceiling the same door has only 13.25 in, so the arch would not fit; use a crosshead or a 6 in tall overdoor panel instead.
Pro tips
- Paint the overdoor detail the same color as the casing so door and detail read as one composition.
- When several doors share a hallway, give them all the same overdoor detail at the same height, even if one door is narrower.
- Center an arch on the door opening, not on the casing, if the casing legs are different widths after an old repair.
- Prime every cut MDF edge before painting; curves show patchy paint first.
- Tape a paper template of the arch over the door for a day before fixing it; proportion mistakes are obvious in person.
- Fix MDF overdoor pieces with adhesive and brad nails into the header framing above the door, which is solid.
Common mistakes with over door decorative molding
- A detail wider than the casing on one side only. Fix: center and match or overhang equally.
- Touching the ceiling or crown. Fix: keep at least 3 in clear above.
- A tall pediment in a 12 in space. Fix: use a crosshead cap under 10 to 13 in.
- Overdoor detail lower than wall frames nearby. Fix: align with the head casing line shared by the wall frames.
Shop the look
- U-Shaped Arch Wall Trim Kit: 70 x 135 cm or 96 x 148 cm arches for tall walls beside doors, from $81.40.
- Picture Frame Wainscoting Kit: a single panel from $51.25, the base for a rectangular overdoor frame.
- Curved Arched Wall Molding: a single arch kit, $145, for a feature wall next to the door.
Frequently asked questions
What is the molding above a door called?
The horizontal piece is the head casing. Decorative additions above it are called a crosshead or header cap, a pediment, an overdoor panel, or an overdoor in older European rooms.
How do you add decorative trim above a door?
Measure the space above the head casing, choose a detail that leaves 3 in to the ceiling, center it on the opening, and fix it with adhesive and brad nails into the header framing.
Can you put crown molding over a door?
Yes, as a crosshead: a short piece of crown or cap molding sitting on the head casing and returned at both ends. It adds 3 to 6 in and suits 8 ft ceilings.
Does over door molding work on 8 ft ceilings?
Yes, but keep it low: a crosshead cap or a slim overdoor panel. Arches and pediments usually need a 9 ft ceiling.
Should over door trim match the casing?
Match its color and line it up with the casing edges. The profile can be richer than the casing, but not wider than the casing plus 1 in each side.
For full arched openings and faux arches, see our molding for archway guide. Ready to choose? Browse Arched Wall Molding, or plan your wall with live pricing in our Wall Designer.
Last updated: October 9, 2026
