The structures, which include Alison and Peter Smithson's Upper Lawn Cottage in West Tisbury, Wiltshire, could achieve Grade-II status following a public consultation.
The other properties are the Chapel at St Mary's University College, Waldegrave Road, Twickenham; 38 Millfield Lane in Camden, north London; Wildwood, 12A Western Avenue, Poole, Dorset; and South Winds, Cryfield Grange Road, Coventry.
McIntosh said: 'These five buildings, all of which were designed by leading architects, have unique and distinctive architectural interest.'
Originally an 18th-century structure, Upper Lawn Cottage was designed as a weekend retreat by the Smithsons, who are credited as the founders of New Brutalism. They incorporated elements of the old building in their new construction, which dates from 1961-62.
The Chapel at St Mary's University College was built in 1962-63 to the designs of Albert Richardson of Houfe and Partners. Philip Pank, Richard Hordern and Robert Harvey designed other projects being considered.
All the buildings will have the usual three-month consultation period except for South Winds in Coventry, which will be two weeks.