A farm has applied to build two 300ft-long poultry sheds to boost chicken production to 3m birds a year.
Newcombe-Baker Farms has applied for planning permission for two additional units alongside the eight it already operates off the B1454 Docking Road at Sedgeford, near Hunstanton.
It says in a planning statement: "The farm rears chickens for the purpose of meat production. As with the existing development, each of the new poultry sheds would accommodate up to 38,000 birds, based on a stocking density of 21 birds per square metre.
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"The proposal would thus increase the number of birds housed on the farm from around 304,000 birds to 380,000 broilers."
It adds the extension would increase the number of chickens reared each year from 2.4m to 3m.
"The relatively isolated location of the site has been chosen in order to avoid adverse amenity impacts due to noise and smell emissions," it says.
A decision is expected from West Norfolk council next year.
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