Heritage Harbor, an 860-acre planned development west of Annapolis, has been reopened as a community for older adults by U.S. Home Corp., a Houston-based public firm that now is the nation's top-volume homebuilder.

At least one purchaser of each home must be age 45 or older, according to James Jeffery, the sales manager. Richard Struse is U.S. Home's project manager there.

The former Croyder-Irvin firm of Washington opened Heritage Harbor in 1975 on a wooded site of plateaus and ravines between South River and Broad Creek in Anne Aroundel County. U.S. Home bought the site last year.

Six models of one-story houses, including two models of semi-detached units, were opened recently. Prices begin at $72,990, and range to $94,900 for a large model with a basement and deck. Fireplaces and basements are options.

Work has been started on a large community center overlooking the South River. Facilities will include indoor and outdoor pools, an art studio, lounge, library, whirlpool, exercise rooms, and outdoor tennis courts.

U.S. Home plans to build more than 1,500 single and semi-detached houses on the site over the next eight to 10 years, according to Jeffery.

The area office of U.S. Home, based in Wheaton, formerly was Page Construction before owner Herman Porten sold it to U.S. Home three years at six locations in nearby Maryland and Virginia.

U.S. Home currently is the largest on-site manufacturer of houses in the U.S. with 209 communities in progress in 65 cities in 11 states. The corporation recently reported total net income of $30 million for calendar 1978, when 11,931 houses were completed for buyers. CAPTION: Picture, These semi-detached houses are offered at Heritage Harbor development. By Vanessa R. Barnes - The Washington Post