Coffered Ceiling Installation and Box Beams
A flat eight-foot ceiling becomes the best thing in the room. The trick is the layout and what the beams are screwed to; we do both before a beam is built.
JMB Builders does coffered ceiling installation and box beam ceilings across the Twin Cities metro. We lay the grid out on the ceiling so the coffers are even and centered on the room, build hollow box beams on site from MDF or wood, screw them into the joists or into blocking we add, and finish the inside of each coffer with crown or a cove. Paint-grade or stained. Priced per room, quoted from your photos within one business day.
- Priced per room
- Grid laid out and taped on the ceiling first
- Hollow beams screwed into joists or blocking
- Paint-grade MDF or stain-grade wood
- Licensed MN contractor BC809005
A coffered ceiling is a grid of beams with a recessed panel, a coffer, in each square. A box beam ceiling is the same idea with fewer beams, usually running one direction. Both are built the same way on site: a flat nailer screwed into the ceiling joists or into blocking, then a hollow three-sided box built around it out of MDF or wood, then crown or a cove inside each coffer where the beam meets the ceiling. JMB Builders builds coffered ceilings and box beams across the Twin Cities metro, in dining rooms, living rooms, offices and primary bedrooms, paint-grade or stain-grade.
Layout is the whole job. The grid has to be centered on the room, or on the light fixture, or on the fireplace, and the coffers have to come out equal, with the beams landing where the ceiling framing can hold them. On an eight-foot ceiling the beams have to stay shallow so the room does not feel low. We tape the grid on the ceiling and you stand under it before we cut anything. Then the beams go up, hollow so they are light and straight, and everything gets filled and caulked so it reads as one piece.
What you supply
- A photo of the ceiling from each corner, the room's length, width and ceiling height, and where the light fixtures are
- The look you want: a full coffered grid or a few box beams, deep or shallow, painted or stained, and an inspiration photo if you have one
- Paint or stain color; the ceiling goes in filled, caulked and primed, painting or staining is quoted as a separate line
What JMB supplies
- Grid layout drawn to your room and taped on the ceiling so you approve the coffer size and the centering before we build
- Joist locations found and blocking added between joists where a beam runs parallel to them
- Hollow box beams built on site: a nailer screwed into framing, sides and bottom in MDF, poplar or the species you pick for stain
- Crown, cove or a flat band inside every coffer, corners coped and mitered
- Light fixture and fan boxes relocated to the center of a coffer where needed, with an electrician for the wiring
- Nail holes filled, joints caulked, primed for paint; painting or staining as a separate line
- Photos of the finished ceiling in your job folder
How it is priced: per room
Quoted in writing from your photos within one business day. What moves the number:
- Room size and how many coffers the grid makes — more beams, more intersections, more crown inside
- Box beams one direction vs. a full coffered grid with beams crossing
- Beam depth and width, and whether they are paint-grade MDF or stain-grade wood
- Ceiling framing: beams that cross the joists screw straight up, beams that run with the joists need blocking added
- Crown inside each coffer vs. a simple cove or a flat band
- Lights, fans or vents that have to move to land in a coffer, and the electrician for that
- Ceiling height: shallow beams on an eight-foot ceiling vs. deep beams on a nine- or ten-foot ceiling
- Painting or staining as a separate line, or primed for you
Send corner photos, the room dimensions and ceiling height, and note where the lights are. Say painted or stained. We draw the grid and quote the room as one number.
How long it takes
A few box beams in one room: two days. A full coffered grid in a dining room or office: three to five days. Staining or painting adds a day or two after.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized quote within one business day. We only come out to measure first when the job needs a tape measure — no pressure, no games.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Full coffered grid
Beams crossing in both directions, a square or rectangular coffer in each opening, crown or cove inside every coffer. The formal version for dining rooms, offices and living rooms with nine-foot ceilings or taller.
Box beams one direction
Two to four parallel beams across the ceiling, no cross beams. Lighter look, less material, and the right choice on an eight-foot ceiling or a farmhouse-style room. Often stained.
Faux wood beams
Hollow beams built from rough-sawn or clear pine, or a prefinished beam wrap, screwed into blocking. The look of a timber beam at a fraction of the weight, and the ceiling never has to carry a solid beam.
Perimeter beam with a tray
A single beam run around the edge of the room, sometimes with a crown on top, so the center of the ceiling reads as a tray. A simpler way to frame a ceiling without a full grid.
Coffered Ceiling Installation and Box Beams: questions, answered
How are coffered ceiling beams attached to the ceiling?
Each beam starts with a flat nailer screwed through the drywall into the ceiling joists. When a beam runs across the joists that is easy; when it runs the same direction as the joists and lands between them, we open the ceiling and add blocking between the joists, or shift the grid a little so the beam lands on framing. The hollow beam box is then built around the nailer. Nothing hangs on drywall alone.
Can you put a coffered ceiling on an eight-foot ceiling?
Yes, with shallow beams. On an eight-foot ceiling the beams stay around four inches deep or less and the coffers are kept large so the ceiling does not feel like it is coming down. Box beams in one direction, or a perimeter beam with a tray effect, are the safer choices at that height. Nine feet and up can take a full grid with deeper beams. We tape the layout on your ceiling so you can see it first.
What are the beams made of?
For a painted ceiling, the box is built from MDF or poplar on a pine or plywood nailer, which is flat, stable and paints smooth. For a stained ceiling, the sides and bottom are a real wood, clear pine, oak, alder or whatever matches the trim, with the corners mitered so no end grain shows. Either way the beam is hollow, so it is light and it stays straight. Solid timbers are rarely the right answer inside a finished house.
Do faux beams look real?
A well-built hollow beam does, because what you see is the same wood a solid beam would show: the face, the sides and mitered corners. The tell on a bad one is a visible seam at the corner or a beam that is not straight. We miter and glue the corners, sand the seam, and on a rough-sawn look we use rough-sawn stock so the texture is real, not painted on.
What happens to the light fixture in the middle of the ceiling?
The layout decides. Usually the grid is centered on the fixture so it lands in the middle of a coffer. When the fixture is off-center in the room, either the grid is centered on the fixture and the edge coffers absorb the difference, or the fixture box gets moved to the center of a coffer, which is an electrician's job we schedule in. Recessed cans and a fan are handled the same way, one per coffer.
Painted or stained coffered ceiling?
Painted, usually the ceiling white or the trim color, is the classic look and the more forgiving one, since the joints are filled and caulked. Stained takes a real wood for every visible face, tighter joints, and more time, and it reads warmer and heavier, which suits a study or a living room with a stained mantel. Both go in ready to finish. Painting or staining is quoted as a separate line, or leave it primed and paint it yourself.
Get a written quote for this job
Three photos and a sentence is enough. You hear back within one business day. Or text the photos to 763-204-2099.
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Read morePage reviewed September 24, 2026 · JMB Builders LLC, MN license BC809005 · All finish carpentry pages
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