Second home owners in an upmarket area dubbed Chelsea-on-Sea will be made to pay double council tax as part of measures designed to protect properties for locals.
The five-mile natural coastal shingle between Heacham and Snettisham has shifted inland, with the Environment Agency (EA) assessing to see whether a so-called trigger point has been reached.
Towns and villages along the north Norfolk coast have already imposed curbs following public votes, such as limiting newbuilds to those using them as principal properties.