Tourist accommodation could be formed from offices in Felpham.
The Sussex Autistic Community Trust has applied for a change of use for its premises in Summerley Lane.
The trust wants the building to become a dwelling with B&Bs attached.
A statement by its planning agent, Richard Vickery, says: “The original 18th century structure and later rear extension would form the main body of the house…providing three to four bedrooms.
“The future intention for the remaining wing fronting the B2259…is to adapt the internal layout of the area denoted as flatlets 1, 2 and 3, together with the rooms above to provide ‘bed and breakfast’ accommodation.
“The proposed ‘bed and breakfast’ accommodation would not comprise self-contained flats.
“The proposed change of use and improvements have been discussed with local residents who are in support of the proposals.”
The property comprises three elements. The original is a two-storey house, with an extension added to the back. A later two-storey wing was added.
A single-storey building could have been old outbuildings or a forge.