Built-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.
Built up baseboard is base made from two or three pieces: a tall flat board with a base cap moulding on top and shoe at the floor, or a base cap and shoe added to the baseboard already on the wall to make it taller. JMB Builders installs both across the Twin Cities metro, coped at the inside corners, filled and caulked for paint. Priced per linear foot, quoted from your photos within one business day.
- Priced per linear foot
- Cap on existing base, or new tall base built up
- Flat stock in MDF, pine or poplar; stock cap profiles
- Quote from photos in 1 business day
- Licensed MN contractor BC809005
Most Twin Cities houses built after 1980 have a short, thin baseboard with a rounded top. It disappears next to taller casing, wainscoting or a nine-foot ceiling. The fix does not have to mean tearing it out. A base cap moulding nailed along the top edge of the existing base, plus a shoe at the floor, makes it taller and gives it a profile. When the existing base is too beat up to keep, a tall base built from flat stock with a cap on top costs less in material than a wide one-piece profile and looks like the base in a 1920s house.
Either way the joints are what matter. Cap is coped at every inside corner so the profile meets without a gap, outside corners are mitered and glued, and the whole assembly is filled and caulked so it paints as one piece.
What you supply
- A photo of the existing base, and of any casing or wainscoting it needs to line up with
- The height you want, or let us suggest one that clears the door casing and the outlets
- Cap and shoe profiles if you have a preference (we stock standard ones)
- Paint color if we are painting — separate line on the quote, or paint it yourself
What JMB supplies
- Base cap and shoe in primed pine or MDF, and flat stock in MDF, finger-joint pine or poplar for new tall base
- Removal of old base when it is being replaced
- Outlet boxes in the base line reset in place; a licensed electrician when a box has to move
- Coped inside corners, glued and pinned outside corners, scarf joints on long walls
- Cap set on a level line so the top edge reads straight even when the floor does not
- Fill at nail holes, caulk at the wall and at the seam between cap and board
- Photos of the finished walls in your job folder
- Painting of the base when you want it, quoted as its own line
How it is priced: per linear foot
Quoted in writing from your photos within one business day. What moves the number:
- Cap and shoe on existing base (fast) versus tearing out and building new tall base
- Two-piece (board and cap) versus three-piece (board, cap and shoe)
- Number of inside and outside corners and closets — corners take the time, not the straight runs
- MDF versus pine or poplar flat stock
- Carpet, which needs the base held up, versus hard floors that take shoe
- Whether door casing needs plinth blocks or a backband so the taller base dies into it cleanly
- Painting, quoted separately
Send a photo of one inside corner, one door casing where the base meets it, and the room size. That is enough for a firm quote.
How long it takes
Cap and shoe on an existing room: a half day. New built-up base in a room: about a day. A whole main floor: two to three days, plus painting if we are doing it.
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
Cap and shoe on existing base
The existing base stays. A base cap moulding goes on the top edge, shoe at the floor, everything caulked. Adds height and a profile for the least money and the least mess.
Flat stock plus cap
A tall flat board in MDF, pine or poplar with a separate cap moulding on top. Any height you want, and the cap profile can match the casing in the room.
Three-piece base with shoe
Board, cap and shoe. The build in most pre-war houses and the one that best handles a wavy floor, because the shoe follows the floor and the cap stays level.
Base meeting narrower casing
When the new base is taller than the door casing is wide, the casing gets a plinth block or a backband so the base dies into something instead of running past it.
Built-Up Baseboard — Base Cap and Tall Base From Flat Stock: questions, answered
Can you make my existing baseboard taller without replacing it?
Yes, if the existing base is flat-faced or nearly so and still tight to the wall. A base cap moulding goes along the top edge, a shoe at the floor, and the seam is caulked. Base with a big rounded top or a lot of profile does not take a cap well; that base comes out and a new built-up base goes in.
What is base cap moulding?
Base cap is a small moulding, usually about an inch tall, shaped to sit on the top edge of a flat baseboard. It gives a plain board a finished profile and covers the gap where the board meets a wavy wall. It comes in a few standard shapes at any lumberyard, in primed pine and MDF.
Is built-up base cheaper than a one-piece tall profile?
Usually, on material. Flat MDF or pine stock plus a small cap costs less per foot than a wide one-piece moulded profile, and flat stock comes in any height. It takes a little more labor to install two pieces, so the totals end up close on a small room and favor built-up on a large one. Either way it is priced per linear foot.
What height should built-up baseboard be?
It depends on the ceiling and the casing. Taller ceilings take taller base, and the base should be a bit taller than the casing is wide or the two collide at the door. Outlets near the floor set a limit too, unless they are moved. We suggest a height from your photos and can tape a sample on the wall before cutting.
Do you use MDF or wood for the flat stock?
MDF is the common choice for painted base: it is flat, has no knots and takes paint well. Pine or poplar is better where the base could get wet, like a bathroom or a mudroom, or where it will be stained. We use MDF in most dry rooms and wood where water is likely.
Does the built-up base get painted?
Painting is on the quote as its own line. The base goes in primed, filled and caulked. Leave it that way and paint it yourself, or have us paint it along with the shoe and cap so the three pieces read as one.
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.
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Read morePage reviewed September 26, 2026 · JMB Builders LLC, MN license BC809005 · All finish carpentry pages
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