A bounded domain is a (1,p)-extension domain if and only if it is Ahlfors regular and satisfies (1-s)[f]_{W^{s,p}(Ω)}^p ≤ C [f]_{W^{1,p}(Ω)}^p for all f in the homogeneous Sobolev space and s near 1.
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How to Recognise Extension domains
A bounded domain is a (1,p)-extension domain if and only if it is Ahlfors regular and satisfies (1-s)[f]_{W^{s,p}(Ω)}^p ≤ C [f]_{W^{1,p}(Ω)}^p for all f in the homogeneous Sobolev space and s near 1.