Last updated: October 3, 2026

What size coop do 10 chickens need?

For 10 adult standard-size chickens with outdoor access, Oregon State Extension gives an indoor minimum of 30 sq ft (10 × 3). Our optional 20% buffer makes a 36 sq ft planning target. A clear 6 ft × 6 ft interior reaches that roomier target. For 10 laying hens using a secured run, Penn State Extension gives 80 sq ft (10 × 8); an 8 ft × 10 ft run is one matching rectangle.

Concept layout for 10 laying hensA 6 by 6 foot usable interior with two four-foot roost bars and three nest boxes connects through a pop door to an 8 by 10 foot secured run. This is a space planning sketch, not a building plan.6×6 ft usable interior8×10 ft secured runTwo example 4 ft roost bars3 nest boxespop door80 sq ft targetcovered, secured access to checkSchematic only. Confirm actual clearances, ventilation, access and construction details.
A dimensioned area example. The sketch does not set wall, door, vent, nest height, framing or predator-proofing details.

How the layout numbers work

  • Indoor: 10 × 3 sq ft = 30 sq ft OSU minimum with outdoor access. A 6×6 clear interior supplies 36 sq ft and reaches our optional roomier target.
  • Run: 10 laying hens × 8 sq ft = 80 sq ft under Penn State's laying-hen table. An 8×10 rectangle provides that area, provided its full area is usable.
  • Nests: ceil(10 ÷ 4) = 3 using OSU's one box per about four birds. OSU suggests boxes about 12 inches each side.
  • Roost: 10 × 5–10 inches = 4.17 ft–8.33 ft usable total. Two 4 ft bars provide 8 ft within the OSU range; placement and spacing need review.

If the birds have no outdoor access

The 6×6 example no longer reaches OSU's indoor range. Ten birds × 8–10 sq ft = 80 sq ft–100 sq ft. The site's optional buffer above the upper end is 120 sq ft. This is a different management scenario, not a larger version of the run calculation.

Before you choose a product or draw a plan

Check the manufacturer's usable inside dimensions, not just its overall footprint or advertised “10 chicken” capacity. Identify whether nest boxes project outside the measured floor, and whether an attached run's entire floor is usable. If these details are missing, leave the comparison unknown. Use the coop fit calculator to enter confirmed numbers and print your brief.

This diagram is a planning sketch, not a tested build plan or cut list. Ventilation, predator resistance, drainage, cleaning access, climate and local rules still need separate review. Chicks, meat-bird production, ducks, bantams, unusually large breeds and mixed species are outside the model.

Checking a specific small footprint? Read the 4×8 worked example or return to the chicken planning hub.