Bullnose Corner Trim — Casing and Base at Rounded Drywall Corners
Rounded drywall corners look fine until you run baseboard around them or try to case a doorway that has no square edge. Here is how we trim them so the corners look intentional.
Bullnose corner trim is the casing and baseboard work in a 1990s or 2000s house with rounded drywall corners. JMB Builders does it across the Twin Cities metro three ways: base wrapped around the radius with two small miters, bullnose corner blocks, or the doorway squared with square corner bead so casing goes on flat. Priced per opening for casing and per linear foot for base, quoted from your photos within one business day.
- Base wrapped with two miters or a corner block
- Doorways squared so casing sits flat
- Per opening for casing, per foot for base
- Quote from photos in 1 business day
- Licensed MN contractor BC809005
A lot of metro houses from the 1990s and 2000s have bullnose corner bead: every outside corner, including the doorways, is rounded instead of square. It hides nicks and photographs well. It also means there is no edge for baseboard to miter around and no flat surface for door casing to land on. Trim installed as if the corners were square leaves a gap at every one.
There are three fixes, and we use all of them depending on the house. Baseboard gets wrapped around the radius with two 22-1/2 degree cuts and a short filler piece, or a molded bullnose corner block sits on the corner and the base butts to it. Doorways that are getting casing get squared off first: the rounded bead comes off, square bead goes on, the corner is refinished, and a jamb extension gives the casing an edge. Which one makes sense depends on how many corners there are and whether the walls are being painted anyway.
What you supply
- Photos of two or three corners: one where base meets the radius, one doorway you want cased, one wide shot
- The base and casing profile you want, or we match what is elsewhere in the house
- A choice between corner blocks, wrapped miters or squaring the corners (we recommend from the photos)
- Paint color if we are painting — separate line, or leave it primed and paint it yourself
What JMB supplies
- Baseboard and casing in primed pine or MDF, and bullnose corner blocks in the base height when that is the choice
- Two 22-1/2 degree cuts and a filler piece at every wrapped base corner, glued and pinned
- For squared doorways: rounded bead removed, square bead installed, mudded and sanded, jamb extension fitted, casing on with an even reveal
- Drywall touch-up and texture at every corner that gets changed
- Fill and caulk so the corners paint as one piece
- Photos of the finished corners in your job folder
- Painting of trim and touched-up walls when you want it, quoted as its own line
How it is priced: per opening
Quoted in writing from your photos within one business day. What moves the number:
- Wrapped base corners or corner blocks (quick) versus squaring the corner with new bead and drywall finishing
- How many bullnose corners the base has to get around — a whole floor can have dozens
- Doorways that get squared and cased versus doorways left rounded with base only
- Casing width, since a wide casing needs more corner squared than a narrow one
- Drywall texture that has to be matched where corners are refinished
- Painting, quoted separately
Tell us whether the walls are being repainted anyway. If they are, squaring the corners is easy to hide; if not, corner blocks avoid touching the paint.
How long it takes
Base with wrapped corners or blocks: a room in a few hours, a floor in a day or two. Squaring and casing doorways: about a day for three or four openings plus a return visit for finish coats and texture.
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
Wrapped base (two small miters)
The base follows the curve: a short piece cut at 22-1/2 degrees on each end bridges the radius, and the base on either side meets it. No block, no extra material, and the profile runs unbroken around the corner.
Bullnose corner blocks
A molded block with a rounded face sits on the corner; base butts to it on both sides. Fastest, and the most forgiving on a corner that is not quite plumb. Available in common base heights or made from flat stock.
Squared doorways for casing
Bullnose bead comes off the doorway, square bead goes on, the corner is finished and the jamb is extended to the new wall face. Casing then goes on with a normal reveal. The right answer when you want real door casing.
Casing set back from the radius
A wider flat casing or a backband set back from the rounded edge so it lands on flat drywall. Cheaper than squaring, but the rounded edge stays visible beside the casing.
Bullnose Corner Trim — Casing and Base at Rounded Drywall Corners: questions, answered
How do you put baseboard on rounded corners?
Two ways. The base can wrap the corner with a short filler piece cut at 22-1/2 degrees on each end, so the profile follows the curve. Or a bullnose corner block sits on the corner and the base butts into it from both sides. The wrap looks cleaner; the block is faster and easier to keep tight when the corner is not plumb.
Can you put door casing on a bullnose corner?
Yes, but the corner has to be dealt with first. Casing needs a flat edge to land on. We either square the doorway by replacing the rounded bead with square bead and extending the jamb, or use a wide flat casing set back from the radius. Squaring is the better-looking fix and the one we recommend when the room is being painted anyway.
What are bullnose corner blocks?
A short piece of trim with a rounded face that sits on the corner at the height of the baseboard. The base runs into it on both sides with a square cut. They come in molded MDF or wood in common base heights, and we can make one from flat stock to match an unusual base. They save cutting the two small miters at every corner.
Can rounded drywall corners be squared off?
Yes. The rounded bead is cut out, square corner bead is installed, the joint is mudded, sanded and textured to match, and the corner is primed. On a doorway the jamb is extended to the new face so casing lands flat. It is a drywall job with a return trip for coats, so it makes sense at doorways and less sense at every corner in the house.
Does it cost more to trim a house with bullnose corners?
Somewhat. Every outside corner takes three cuts instead of one, or a block, and doorways that get cased need to be squared. The added time shows up in the per-opening and per-foot price. Send photos of the corners and the count; the quote covers the corner work with no allowances.
Does crown moulding work with bullnose corners?
Crown runs at the ceiling, and the wall-to-ceiling corner is square even in a bullnose house, so the crown is usually unaffected. Where a rounded outside corner runs all the way to the ceiling, the crown is wrapped the same way as base: two small miters and a filler piece. Send a photo of one corner and we will tell you which case you have.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and for the builders and dealers we sub for. Counts come straight from our job log; no customer names.
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.
Related jobs we do
Baseboard & Casing Installation
Straight lines, tight miters, and coped inside corners — baseboard and window & door casing installed room by room or across your whole home.
Read moreDrywall Corner Bead Repair — Dented and Cracked Outside Corners
Outside corners take the hits — a vacuum, a moving dolly, a kid on a scooter. A dented or cracked corner bead does not fill; the section is replaced and refinished so it disappears.
Read moreBuilt-Up Baseboard — Base Cap and Tall Base From Flat Stock
Short builder base looks small under tall ceilings or new casing. Add a cap and shoe to what is there, or build a taller base from flat stock and a cap, without buying a wide one-piece profile.
Read morePlinth Block and Rosette Corner Block Door Trim
Corner blocks and plinths are the trim that lets the casing be square-cut and still look right, and the trim that makes an old Minneapolis or St. Paul house look like itself again.
Read moreDrywall Texture Matching — Knockdown, Orange Peel and Skip Trowel
The patch is flat but you can still see it, because the texture around it is not — matched and blended by hand or hopper so the wall reads as one surface after paint.
Read moreAttic Hatch Trim — Casing, Painted Panel and Insulated Lid
The scuttle hole with a raw drywall edge and a loose square of drywall dropped on top of it: we case it, build a real lid, seal it and insulate it.
Read morePage reviewed September 26, 2026 · JMB Builders LLC, MN license BC809005 · All finish carpentry pages
Where we work
Finish carpentry near you
Based in Zimmerman, scheduling across the Twin Cities metro. Closest first: