The South Gippsland Planning Scheme consists of zones, overlays and other provisions which determine whether a permit is required. To check which zones and overlays affect your property, visit VicPlan
https://www.planning.vic.gov.au/schemes-and-amendments/planning-report-search
Generally, a permit is required for:
- subdivision of land
- development of land in rural areas
- extending your home
- constructing a dwelling on a lot less than 300m2
- building two or more dwellings [units/townhouses] on one lot
- starting a business
- changing the use of your land or buildings (e.g. shop to a medical centre or warehouse to a gym)
- constructing outbuildings and sheds in rural areas
- commercial or industrial development
- applying for a liquor licence
- constructing or displaying signage
- waiver or reduction of car parking (associated with changing the use of the land or increasing the floor area of the building)
- creation, variation or removal of easement or restriction
- removal of a tree, removal of vegetation, native and/or introduced
You should not assume that any works, however small, do not require a permit.