An energy conservation seminar is scheduled to begin today at 8:30 a.m. at the Holiday Inn in Silver Spring. Developed by the National Home Improvement Council and the Alliance to Save Energy, the seminar is the first of nine to be held in different cities. The purpose of the all-day program is to train and qualify home remodelers as residential energy retrofit specialists.

Expo '78, a trade show featuring displays of products and services used for the management, operation and maintenance of multi-family residential and office buildings, will be held Oct. 12, at the Capital Centre.

Construction and permanent financing for Sylvan Manor Health Care Center in the Capital View area of Silver Spring, a 130-bed expansion of an existing facility owned and operated by Morton, Selma and Sanford Rosen, has been arranged by American Development and Finance Corp. of Rockville. The $3.4 million, federally insured loan was arranged through the issuance of securities backed by the Government National Mortgage Association. Stauffer Construction Co. of Wheaton is the general contractor.

A woodworking tool exhibit can be seen today and Sunday at the Springfield Mall. Shopsmith Woodworking Promotions of Vandalia, Ohio, is the exhibitor.

Executive Properties Inc., a McLean realtor firm headed by Harry Messner, has affiliated with Globe Worldwide Business Brokerage Inc., a real estate network based in Lansing, Mich.

Courses designed for persons planning to buy or sell a house or buy a condominium are scheduled by the Northern Virginia Community College. For information, call 323-4240.

The Women's Council of the Prince George's County Board of Realtors will meet at noon Wednesday at the Holiday Inn at Suitland and Allentown roads to talk about ethics.

Robert J. Sinnenberg, president, has announced the formation of Finacial Investors Corp., with offices at 5530 Wisonsin Ave. NW.

Case Construction, a Washington firm, recently won four of six residential remodeling awards made by Qualified Remodeler magazine, published in Chicago. The firm headed by Frederic F. Case was named contractor of the year by the National Remodelers Association in 1976.

A round-table discussion on rules and regulations will be held Oct. 17 by the area Community Associations Institute at the Key Bridge Marriott. Free reservations are available by calling 588-8668.

A training program for professional housing rehabilitation specialists and persons interested in that line of work will be held by the Graduate School of the Department of Agriculture. Evening sessions will be held in the National Press Building. For information, call 223-6800, extention 335.

The Carey Winston Co. announced that it has obtained a $650,000 permanent mortgage for a small office building at 1730 Massachusetts Ave. NW. The renovated Victorian structure is occupied by a law firm.

Walker & Dunlop of Washington arranged $4.3 million in permanent financing for the Center Plaza Shopping Center in Dale City. The loan for the 106,700-square-foot shopping center on 13.3 acres was placed with Great-West Life Assurance Co. of Winnipeg, Canada. Cecil D. Hylton, whose firm developed Dale City, is the owner of the shopping center.