Vermont Act 250: what it allows on a lot
Act 250 is Vermont law, and the official source is at nrb.vermont.gov.
Large projects and many subdivisions need a state land use permit.
Whether it applies to one lot turns on where the lot is and what it is zoned; the city, county or state office named in the law decides. Mapped areas are approximate. This is a plain reading of public law with its source, not legal advice.
Free, no account. ParcelSheet shows the lot's mapped size, parcel lines and flood zone, and this law on the lot's Vermont sheet.
Other Vermont laws on a lot: HOME Act (2023), Wastewater permit.