This is a notice which can require operations, a use of land (other than as a dwelling), etc to cease within a specified period usually between 3 and 28 days, though a shorter period can be specified if this is considered to be warranted. A stop notice cannot be served independently of an enforcement notice; it can be served at the same time as or after the enforcement notice is served. Failure to comply with a stop notice is a criminal offence.
There is no right of appeal against a stop notice. In some circumstances a planning authority can be liable to pay compensation if the related enforcement notice is subsequently quashed, so authorities normally only serve stop notices where a development is particularly unneighbourly or otherwise causes significant planning harm.