Written by Rocky Mountain Metal · Reviewed by Micah Hostetler, Owner · Based in Penrose, CO, serving Colorado.
Start from the stall: 12×12 for an average horse, a center aisle at least 12 feet wide, and 10 to 12 feet of clear height. Add tack, feed and hay space, and a 36-foot-wide barn fits naturally.
Key takeaways
- 12×12 stalls are the standard; go bigger for drafts, warmbloods and foaling.
- A 12-foot center aisle is the minimum that works day to day.
- Clear height of 10 to 12 feet improves air and keeps heads and lights apart.
- Plan tack, feed, hay and a wash rack now; they're hard to add later.
- Ventilation and light matter more than insulation in a Colorado horse barn.
How big should each stall be?
| Horse | Stall |
|---|---|
| Ponies, small horses | 10×10 to 10×12 |
| Average riding horse | 12×12 |
| Large horses, warmbloods | 12×14 to 14×14 |
| Draft breeds, foaling stalls | 14×14 to 16×16 |
Stall walls are typically about 8 feet high with grill or open tops for air and visibility, and stall doors about 4 feet wide. Dutch doors to the outside give horses air and a view and give you a second way to move them.
In a steel-framed barn, the steel shell is the building. Stall fronts, partitions and kick boards go in inside the finished shell, usually from a stall-system supplier or a local carpenter, so plan the frame spacing and door openings around the stall layout before the order goes in.
How wide should the aisle be?
A 12-foot center aisle is the working minimum: horses pass, cross-ties work, a wheelbarrow and a person fit around a horse, and a truck or tractor can drive through for hay and manure. Fourteen feet is roomy. Ten feet works only in the smallest barns.
Two layouts dominate:
- Center aisle. Stalls on both sides, aisle down the middle. The all-weather choice for Colorado winters.
- Shed row. Stalls in a line opening onto a covered walkway, often a steel lean-to. More air, more weather.
How tall should a horse barn be?
Ten feet of clear height under the frame is the practical minimum; twelve is better. Height gives air volume, keeps a rearing horse away from lights, and lets you drive a loaded truck or a tractor with a loader down the aisle. Wall height is set when the building is ordered and can't practically be raised later, so choose it now. See how much does a metal building cost? for what drives the quote.
Which rooms should I plan for?
- Tack room. At least 12×12, insulated, lockable, ideally with a floor you can heat. Many owners add a utility sink here.
- Feed room. Separate from tack, rodent-tight, with room for bins and a freezer.
- Wash rack. A stall-sized bay with a floor drain, frost-free water and rubber mats. See getting water to a barn.
- Hay storage. An end bay, a lean-to, or a separate building. Storing hay in the horse barn is a fire and dust trade-off; see how should I store hay?
- Grooming or cross-tie area in the aisle, with good light.
What footprints are common?
| Barn | What fits |
|---|---|
| 36×36 | 2 to 4 stalls, 12-ft aisle, tack room |
| 36×48 | 4 stalls, tack, feed, small hay bay |
| 36×60 | 4 to 6 stalls, tack, feed, wash rack |
| 40×60 | 6 stalls, tack, feed, wash rack, wider aisle |
| 48×72+ | 8+ stalls, indoor grooming, hay and equipment |
Width follows the stall-aisle-stall module: 12 + 12 + 12 = 36 feet. Adding a steel lean-to down one or both sides gives you run-outs, equipment parking or hay cover without widening the main span.
What Colorado details matter?
- Ventilation over insulation. Horses produce heat and moisture, and a barn that's too tight is unhealthy. Ridge vents, eave openings, Dutch doors and end doors move air. See ventilating a livestock barn.
- Condensation. Steel roof panels sweat on cold mornings without a condensation strategy. See how to stop condensation.
- Snow slide. Keep stall doors and run-outs off the eave drop line, or use snow retention.
- Wind. Orient aisle doors across the prevailing wind, not into it.
- Light. Windows, translucent panels where available, and LED lighting on separate switches.
- Floors. Compacted base under stall mats; concrete in the aisle, tack room and wash rack. See how to prepare your site.
Who plans and builds it?
Rocky Mountain Metal sells steel-framed metal buildings only. We look at your site, lay the barn out around your horses and routine, and place the order with 1st Choice Metal Buildings and Carports. The building is engineered to your site's snow and wind loads, the manufacturer's crew from Texas installs it, and we oversee the project. See agricultural buildings and our service area, then request a free quote.
Frequently asked questions
How many horses fit in a 36×48 barn?
Four 12×12 stalls with a 12-foot aisle, a tack room and a feed room is a very common layout.
Should I insulate a horse barn?
Usually only the tack room and any plumbed space. The stall area should be ventilated, not sealed, with a roof condensation strategy so the steel doesn't drip.
Do I need a permit for a horse barn?
Often, though agricultural exemptions may apply on ag land. Permit requirements vary by county, and we'll walk you through what yours requires. See do I qualify for an ag exemption?
Can I add stalls later?
Often, yes. A steel building can usually be lengthened with matching frames, so plan the aisle to run to an end wall that can be extended and keep that end clear of septic and setbacks.
