Start with 4 birds and their outdoor-access condition, then compare usable space and the daily-care route. A flock label does not require one particular coop style.
Direct answer / source conditions first
How much space for 4 chickens?
There is no single number independent of the housing system. These are published Extension starting points multiplied by 4, not a construction specification or a capacity approval for a particular Plan.
Keep indoor and outdoor allowances separate; do not mix rows into a new standard.
32 sq ft outside (4 × 8). This is a different source and housing context, not a reason to select whichever number is smallest.
Source conditions must be reviewed alongside breed, bird size, confinement time, ventilation, management and usable floor area. Guidance is not a local building or animal-keeping rule. Our Plan facts remain separate and unchanged.
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Open a Reference Design
These are reference directions, not a verified usable-space or site-fit test. Open each reference for its actual enclosed and outdoor relationship. Flock size alone does not select a style.
Compare the layout trade-offs for your 4-bird question
These are comparison references, not verified matches for 4 birds. None currently has reviewed flock suitability. Use the source conditions above, actual usable indoor area, outdoor access and confinement to assess fit. A larger name or total footprint does not establish capacity.
No verified candidate yet? Keep the question open. Larger flock collections remain unpublished until actual designs and delivery evidence support them.