How Big Should a Chicken Coop Be? Size Guide for 3 to 20 Hens
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Choosing the right coop size is the most important decision in any chicken coop build. A coop that is too small leads to stress, pecking and dirty bedding, while a coop that is far too big is harder to keep warm in winter and costs more to build. This guide explains how much space your hens really need and which coop size fits a flock of 3, 6, 10, 12 or 20 chickens.
The Basic Rule: Coop Space and Run Space
Most backyard keepers plan around two numbers:
- Indoor coop space: about 3 to 4 square feet per standard-size hen (around 2 square feet for bantams).
- Outdoor run space: about 8 to 10 square feet per hen.
If your hens spend most of the day confined to the run, or you live where winters keep them indoors for long periods, plan toward the upper end of these ranges.
Chicken Coop Size Chart
| Flock size | Indoor coop space | Run space |
|---|---|---|
| 3 hens | 9 to 12 sq ft | 24 to 30 sq ft |
| 6 hens | 18 to 24 sq ft | 48 to 60 sq ft |
| 10 hens | 30 to 40 sq ft | 80 to 100 sq ft |
| 12 hens | 36 to 48 sq ft | 96 to 120 sq ft |
| 15 to 20 hens | 45 to 80 sq ft | 120 to 200 sq ft |
Matching the Size to a Plan
- 3 hens: a compact raised coop such as our 5x9 small chicken coop plans for 3 hens.
- 4 to 6 hens: the 6x5 lean-to coop with run or the 5x12 raised coop for 6 hens.
- 10 hens: the 6x24 raised chicken coop with run.
- 12 hens: the 10x16 raised walk-in coop for 12 hens.
- 15 to 20 hens: the 10x26 raised coop with long run or the 8x32 walk-in coop and run.
You can browse every design in our chicken coop plans collection.
Other Space Details to Plan For
- Roosts: allow about 8 to 12 inches of roost bar per hen.
- Nesting boxes: one box for every 4 to 5 hens is usually enough.
- Ventilation: high vents above the roosts let moisture escape without creating drafts on the birds.
- Access: a walk-in coop or large clean-out doors make weekly cleaning much easier.
Plan for Growth
Most chicken keepers add birds within the first year or two. If you are unsure, build for two to four more hens than you have today. Extending a run later is easy, but enlarging the coop itself usually means starting over.
Frequently Asked Questions
Can I keep more hens if they free range? Free-ranging reduces the run space you need, but hens still need full indoor coop space for roosting at night and during bad weather.
Is a bigger coop always better? Not always. In cold climates a coop that is much larger than the flock needs is harder to keep warm, so aim for the recommended range rather than the maximum.
