Size a cattle barn from three figures: a tie stall of 1.2×2.4 m per cow (or 5-6 m² per cow in loose housing), a calving pen of at least 3.5×3.5 m, and a feed alley 3 m wide. For eight cows in tie stalls those figures give a footprint of 9.6 m by 5.4 m (51.84 m²), and the herd produces 200-280 kg of manure a day that the layout has to move.
Part of Barn & Livestock Housing Design
Barn layout and stall sizing is the arithmetic that turns animal numbers and body size into floor plans for stalls, alleys and the calving pen.
The Feed Alley And The Manure Route Decide The Plan More Than The Stalls Do
Stall size is fixed by the cow. The plan is decided by how people, carts and manure get past a row of animals each day. Put the stalls along the long wall, the feed alley beside them, and keep the manure route away from the feed route. A layout that forces you to wheel manure through the feed is the commonest planning mistake.
What You Need
- The herd size and whether you will use tie stalls or loose housing
- The planning figures: tie stall 1.2×2.4 m; loose housing 5-6 m² per cow; calving pen at least 3.5×3.5 m; feed alley 3 m wide
- A level building site with a drained floor sloping slightly to a manure channel or door
- Paper and a tape, to draw the plan before cutting any timber
Method: Draw The Floor Plan
Step 1: Count the stalls. One stall per cow in tie housing. Loose housing is measured in area, not stalls.
Step 2: Find the row length. Row length = number of stalls × 1.2 m.
Step 3: Add the stall depth and alley. Building depth = stall depth (2.4 m) + alley (3.0 m).
Step 4: Add the calving pen. Include at least 3.5×3.5 m, in a quiet corner with its own door.
Step 5: Plan the loft and storage. Hay is traditionally stored in a loft above; it also insulates the animals below. See Feed Storage Integration for the fire and gas hazards of that arrangement.
Step 6: Draw the manure route. Mark where manure leaves the barn and make sure it does not cross the feed path; see Manure Management.
Worked Example
Eight cows.
Tie stalls. Row length = 8 × 1.2 = 9.6 m. Building depth = 2.4 + 3.0 = 5.4 m. Footprint = 9.6 × 5.4 = 51.84 m². Stall area alone = 8 × (1.2 × 2.4) = 8 × 2.88 = 23.04 m².
Loose housing. Area = 8 × 5 = 40 m² up to 8 × 6 = 48 m², plus the feed alley.
Calving pen. 3.5 × 3.5 = 12.25 m².
Manure. At 25-35 kg per cow per day: 8 × 25 = 200 kg/day up to 8 × 35 = 280 kg/day. Over a 100-day housed period (an assumed input, not a sourced figure) that is 200 × 100 = 20,000 kg up to 280 × 100 = 28,000 kg, or 20 to 28 tonnes to store or move.
Common Mistakes
- Planning stalls without the alley — the building is then too small to feed from.
- Manure route through the feed alley — contamination and wasted labour.
- A calving pen shared with the milking area — the cleanest part of the barn becomes the dirtiest.
Safety
Crushing, kicking and falls
Cattle weigh several hundred kilograms and can pin a person against a wall or gate. Give every pen and alley a person-sized escape route, never work in a stall behind a cow, and guard openings in a hay loft floor against falls.
What’s Next
- Learn next: Feed Storage Integration — putting hay and grain under the same roof
- Combine with: Milking Area Design — the clean corner of the barn