Energy-saving construction techniques, designs and materials will be the topic at a two-day seminar for home builders to be held June 20-21 at teh Capital Hilton hotel. The sponsors are the National Association of Home Builders with the Department of Housing and Urban Development, the American Gas Association and Edison Electric Institute. For information, call 452-0351.

Bert Lance, director of teh Office of Management and Budget and a close adviser of President Carter, will be the speaker June 21 when the National Housing Conference meets at noon at the International Inn. For information, Call 223-4844.

The residential development of the Village of King's Contrivance in Columbia will be opened June 25, with the showing of model houses built by Ryland, Washington Homes and Columbia Builders. The first neighborhood, called Macgill's Common, is centered around Cape Ann and Shaker drives. The opening is being keyed to Columbia's 10th anniversary celebration.

Robert M. Keats and Bernard Sugarman have announced the purchase of a parcel at Rockville Pike and Strathmore Lane in upper Bethesda as the site for the development of 49 expensive town houses. Keats & Sugarman also have started 19 contemporary town houses on Guy Court in Rockville.

Robert R. Elliot, former general counsel of the Department, has joined the Washington office of the law firm of Dechert, Price & Rhoads as a partner.

A two-week course in introductory architecture for high school students will be offered, beginning June 20, by the School of Engineering and Architecture of Catholic University. For information, call 635-5191.

Shannon & Luchs has announced the negotiation of the sale of a 48-unit apartment building at 320 C St. SE for $750,000. Northern Virginia Futures, Inc., sold the property to Charles L. Pray. Also handled was the sale of the 17-unit apartment building at 1726 17th St NW for $200,000. Barco Management Co. sold to Walibi Joint Venture.

The Fairfax County public school system and McLean High School recently presented a civic responsibility award to Westgate Corp. for employing students in the work study program at McLean High. Westgate owns and operates the business and industrial park community at Tysons Corner.

Wolfe, Matan & Sheehan Realty Inc. has promoted Rosemary Donaldson Davies to vice president for special activities. She has been an agent with the firm since 1969.

Preservatin Resource Group, Inc., based in Springfield, Va., plans a workshop on buying, restoring and maintaining older houses on June 25 at Airlie House in Airlie, Va. For information, call 323-1407.