House additions may or may not require a permit
or variance for the Adirondack Park Agency depending on the location of the existing house and the size of the addition.
There are shoreline restrictions and other environmental conditions that may dictate the design of the house addition.
Adk Compliance would be happy to discuss your project and submit a Jurisdictional Inquiry on your behalf.
And remember your local town or village code enforcement will also require a building permit.