The a/d operator decides what the minimum visual circuit height is, not the aircraft operator. It will be based on local planning conditions and environmental requirements.
When the operator at Farnborough asked me to design 'noise friendly' procedures for Farnborough, I suggested 1,200ft amsl (roughly 1,000ft agl) for 'light' aircraft and 1700ft amsl (roughly 1500ft agl) for aircraft above 2730 kg MTWA and that's what is notified in the AIP.
Last edited by chevvron; 30th Oct 2019 at 13:33.