An industrial space survey made by the Coldwell Banker realty firm shows that the national space vacancy index is 3.4 percent, but the rate for the Washington area is only 1.3 percent. Among 14 major areas surveyed only Portland, Ore., has a lower rate -- 0.8 percent. The highest vacancy rates, both over 4 percent, are in Dallas and Houston.

The Washington Board of Realtors will hold its annual dinner-dance Sept. 28 at the Mayflower, where James R. Ingham Jr. will be honored as Realtor of the Year and Pamela Cox Parkinson as Realtor Associate. Frank X. Emmet will receive the Martin Isen ethics' award.

Eleven members of the Northern Virginia Board of Realtors recently qualified as graduates of the Realtors' Institute: Regina Amann, Adelaide Bullis, Mary Lou Dawson, Paul Delospedale, Nicholas Dorosheff, John C. Hyde, JoAnne Johnson, James E. Motes Jr., Joseph W. Powers, Elizabeth Southcott and Lucy Still.

Evening courses in building and construction will be given, beginning Sept. 15, by the Columbia Technical Institute in Arlington. Bulletins and information are available by calling 920-8866.

Scotco Inc. has leased 10,000 square feet in a building at 9330 Fraser Ave., Silver Spring, from Zanoff Investors, a Maryland partnership. Arthur Rubloff & Co. of Washington handled the $127,500 transaction with Scotco, a minority-owned contractor of machine-tool design and production services.

The Calvert Co. is introducing a new line of single houses on 21 wooded lots in Lake Ridge, a community in the Occoquan area of Prince William County. Prices range from $124,500 for the houses which won a rating for energy conservation equipment and techniques.

The Interior Department's consumer interest program at Glen Echo Park will offer seven workshops, beginning Sept. 8. Topics include residential repairs, weatherizing a home and installing a solar hot water heater. For information, call 229-0350 or 429-6282.

Korzendorfer Realty Inc. has relocated its office to 4405 East-West Hwy., Bethesda.

The area chapter of the American Society of Appraisers will meet Tuesday at the Fort McNair Officers Club. Attorney George Brugger will discuss preparation for court testimony and cross-examination.

The Montgomery County Board of Realtors has qualified speakers available, without charge, to address groups or meetings interested in a variety of realty topics, including home financing, condominiums and cooperatives. For information, call Edith Donohue -- 933-8484.

A two-session course on home buying and home selling will be held Sept.9 and 11 on the Alexandria campus of Northern Virginia Community College. Broker James Bagley will be the instructor. Information is available by calling 323-4240 during normal business hours.

Routh Robbins Real Estate Corp. has opened an office in Bowie, where Sherry Vanskiver is the manager. The firm has new offices under construction in Rockville and Falls Church.