Radiator Cover Installation — Custom Wood Radiator Cabinets
Half the houses in Minneapolis and St. Paul still heat with cast iron radiators. A cover makes one a window seat, a shelf under the window or a piece of trim instead of a thing to walk around.
JMB Builders builds custom radiator covers across the Twin Cities metro: a wood cabinet sized to the radiator with a metal or wood grille front, a solid top you can set things on, open sides and bottom for airflow, and a removable front so the valve and bleeder stay reachable. We build them for cast iron radiators and hot water baseboard, not electric baseboard heaters. Priced per unit, quoted from your photos within one business day.
- Priced per radiator
- Grille front, solid top, removable for valve access
- Cast iron radiators and hot water baseboard only
- Quote from photos in 1 business day
- Licensed MN contractor BC809005
A radiator cover is a wood cabinet built around a hot water or steam radiator: a frame, a grille front that lets the heat out, a solid top that becomes a shelf, and sides that are open or slotted at the bottom so cool air can get in under the radiator. JMB Builders builds and installs them across the Twin Cities metro, most often in the pre-war houses in Minneapolis, St. Paul and the first-ring suburbs where the cast iron is staying and the owner is tired of looking at it.
A cover that is built wrong makes the room colder. A radiator heats mostly by convection: cool air comes in at the floor, warms on the fins, and rises out the top. So the cover needs an open bottom, a grille or slots on the front and an open or slotted top, and it needs clearance to the radiator on every side so the air can move. We build the top solid where you set things and leave a gap at the back for the rising air, and we size the grille so it is most of the front. A cover with a closed top and a small grille turns a radiator into a warm box.
The cover is fastened to the wall, not the radiator, and the front lifts off or hinges so the valve, the bleeder and the pipes are reachable for the plumber. Covers go in primed, filled and caulked; painting is quoted as a separate line, or leave it primed and paint it yourself. Stain-grade covers are built in oak, maple or poplar to match the trim in the house.
What you supply
- Photos of the radiator from the front and from the end showing the valve and pipes, plus its length, height, depth and clearance to the sill
- The look: a plain box with a metal grille, slatted wood, a shaker front, or a photo to match, and whether the top is a shelf or a seat
- The grille pattern you like if it is a metal sheet; we stock a couple of standard patterns and can order others
- Your paint or stain color if you want us to finish it; painting is quoted as a separate line, or paint it yourself
What JMB supplies
- A cabinet frame in poplar or MDF for paint, or oak, maple or another hardwood for stain, sized to the radiator with clearance on every side
- A grille front in perforated or stamped metal sheet, wood slats, or a wood lattice, in a frame that lifts off or hinges
- A solid top in wood or MDF with an open slot or a gap at the back so heat can rise, and a molding under the edge
- Open or slotted bottom rails and end panels so cool air gets in under the radiator
- Cleats screwed to the wall and the floor so the cover is fastened to the house, not to the radiator or the pipes
- A cutout or a hinged panel at the valve and the bleeder, and clearance for the pipes where they come through the floor
- Filled, caulked and primed; painting or staining quoted as a separate line
- Photos of the finished cover in your job folder
How it is priced: per unit
Quoted in writing from your photos within one business day. What moves the number:
- Radiator size: a short cast iron unit under a window vs. a long run of hot water baseboard
- Plain box with a metal grille vs. a slatted or paneled wood front
- Paint-grade poplar or MDF vs. a stain-grade hardwood to match the trim
- A shelf top vs. a window-seat top with a thicker cap and a stronger frame
- Pipes, valves and a bleeder that need a cutout or a hinged panel
- How many radiators in the same visit; the parts are cut in one setup
- Painting or staining as a separate line, or primed for you
Send the radiator length, height and depth, the photos and the clearance to the sill. Say metal grille or wood front, and the quote is firm.
How long it takes
One or two covers: a day, built on site or in the shop and installed in an hour each. A house full of radiators: two or three days. Painting is a return trip after the primer cures.
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
Box cover with a metal grille
A painted poplar or MDF frame with a perforated or stamped metal sheet in the front and a solid top. The standard cover in a Minneapolis or St. Paul four-square, and the one that moves the most air.
Slatted wood front
Horizontal or vertical wood slats in the front instead of metal, spaced open so the heat gets out. Reads as trim rather than a cabinet, and takes paint or stain with the rest of the room.
Window seat radiator cover
A deeper, stronger cover under a window with a thick top you can sit on and a grille front. The top is built with a gap at the back and vented so the seat does not trap the heat.
Hot water baseboard cover
A long, low wood enclosure that replaces the dented metal cover on hydronic baseboard: open at the floor, a slotted front, a small cap on top that doubles as a shelf. Built in sections so the fins stay reachable.
Radiator Cover Installation — Custom Wood Radiator Cabinets: questions, answered
Does a radiator cover block the heat?
A bad one does. A radiator heats the room by pulling cool air in at the floor, warming it and letting it rise out the top, so a cover has to leave the bottom open, put a grille or slats across most of the front and leave a gap or a slot at the top for the rising air. Built that way, with clearance to the radiator on every side, the cover changes very little. A closed top with a small grille is what makes the room colder, and we do not build them that way.
Can you build a cover for a cast iron radiator under a window?
Yes, that is the most common one we build. The cover is sized to sit under the window sill with a gap for air at the top, wide enough to clear the radiator ends and the valve, and deep enough to clear the fins with room for air to move. The top becomes a shelf under the window, and it is built with a slot at the back so the warm air still gets up across the glass, which is where the radiator was put to begin with.
How do you get to the valve and bleeder once the cover is on?
The front panel lifts off or hinges, and where the valve or the bleeder sits at an end we cut a small opening or build a hinged panel there. The cover is fastened to the wall with cleats, not to the radiator or the pipes, so the whole thing can come off in a minute when the plumber needs it. Tell us where the valve is in the photos and it is built in.
Can you cover an electric baseboard heater with wood?
No. An electric baseboard heater has a heating element that gets far hotter than a hot water radiator, and the manufacturer's metal housing is the cover it is designed to have. Boxing one in with wood is a fire risk and we do not do it. We build covers for hot water and steam radiators and for hydronic baseboard, which run at much lower temperatures. If you want the electric baseboard gone, that is an electrician's job.
What is the grille on a radiator cover made of?
Usually a sheet of perforated or stamped metal, aluminum or steel, set into a wood frame; the pattern can be a plain perforation, a cloverleaf, a diamond or a period pattern to match an old house. The other options are wood slats spaced open, or a wood lattice. Metal moves the most air for its size and paints along with the frame. We stock a couple of standard patterns and order others.
Do you paint the radiator cover?
It goes in primed, with the joints caulked and the nail holes filled, ready for paint. Painting it the trim color, or the wall color so it disappears, is quoted as a separate line, or you paint it yourself. A stain-grade cover in oak or maple is built to match the woodwork in the house and is stained and finished as its own line. Either finish handles the heat from a hot water radiator without a problem.
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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