Actor Katharine Hepburn's former Connecticut mansion on Long Island Sound is up for sale, with an asking price of $28 million US.

The large, six-bedroom home in the shoreline community of Old Saybrook was sold by Hepburn's estate for $6 million after her death in 2003.

It has 15 rooms, seven bathrooms, a two-car garage and about 207 metres of waterfront on Long Island Sound. The house has been recently renovated — it had 21 rooms in Hepburn's day.

The mansion was built by the Hepburn family in 1939, after their previous home was destroyed during a 1938 hurricane that devastated large sections of the southern New England coastline.

Hepburn, a four-time Oscar-winner for films such as The Lion in Winter and Morning Glory, spent her final years at the house.

She once entertained Howard Hughes there, a scene that was dramatized in the 2004 film The Aviator.

Listing agent Colette Harron told Reuters that the current owner, New York builder Frank Sciame, is selling because the home has become too much for him.

The house and the property it sits on are valued at $18 million. For the $28 million asking price, two adjacent parcels of land are included.