[5] The design was built by Seidelmann Yachts in the United States, starting in 1977, but it is now out of production.
[1][2][6][7] The Seidelmann 30-T is a recreational keelboat, built predominantly of fiberglass, with wood trim.
It has a masthead sloop rig; a raked stem; a raised counter, reverse transom; an internally mounted spade-type rudder controlled by a wheel and a fixed fin keel or optional shoal draft keel.
[1][2] The boat is fitted with a Japanese Yanmar diesel engine of 15 hp (11 kW) for docking and maneuvering.
The head is located just aft of the bow cabin on the both sides and includes a sink.