Americans paid substantially more for new homes last summer than they would have in 1982 because they bought bigger and better equipped houses, the Census Bureau said this week.

The bureau said its quarterly price index of home sales found the average American paid $132,000 for a new house between July and September. But for homes sold in the period that were about equal to houses sold in 1982, the average price was $99,300, the agency said.

"This indicates that houses continue to be larger and have more amenities than those in the base year," the Census Bureau said.

Inflation also has affected home prices. The bureau said its price index for 1982-style houses sold in the third quarter was 118.3. That means a home sold in the quarter cost 18.3 percent more than the same type of house cost in the base year of 1982.

The third-quarter index was 1.2 percent above the second-quarter level of 116.9 and 3.4 percent above the third quarter of 1986.

The Virginia Real Estate Board has fined three Northern Virginia real estate brokers for various violations of state real estate regulations.

In one case, the board said it fined salesman David R. Kline of Holley Realty Inc. in Vienna $2,000 and ordered him to pay $381 in hearing costs for "making a false promise" and "being unworthy or incompetent to act as a real estate broker ... in such a manner as to safeguard the interest of the public."

Carter Boehm, a broker with Townside Partners Property Management in Alexandria, has agreed to pay a total of $1,600 in penalties for violations dealing "with prohibitions against ... making any misrepresentation and the responsibilities of a principal broker," the board said.

In the third case, Thomas L. Williams, a broker with the Real Estate Exchange of Woodbridge Inc. in Woodbridge, agreed to pay a $250 penalty for failing to "disclose his true position to the owner in writing when acquiring any interest in real property for himself," the board said.

The board also fined six other real estate agents working elsewhere in Virginia.

The number of building permits issued for multifamily housing in the metropolitan Washington area was up 163 percent in September over the same month last year, according to a new report by Regis J. Sheehan & Associates, a Virginia consulting firm.

There were 1,124 permits issued for apartment construction during September, up from 428 granted in September 1986, according to Robert Sheehan, the firm's vice president and an economist.

That caps a year-to-date increase that is 67 percent ahead of the same nine-month period last year. The Virginia suburbs had the greatest increase in multifamily building permits for September, Sheehan reported, with 879 issued this September compared with 41 for the same month in 1986. Fairfax County granted the largest number -- 807, which was 768 more than the 39 it issued in September 1986.

The District of Columbia's total remained flat in September compared with the same period a year earlier. However, in the first nine months of the year, the District is running 179 percent ahead of last year's figures in the number of apartment permits issued.

Figures released by the Department of Commerce show that the District government has issued 588 multifamily housing permits so far this year, compared with 211 during the same period in 1986. Sheehan attributed the increase to relatively low levels of apartment vacancies, which have hovered around 3 percent, and a strong economy that has attracted apartment developers from other markets.

IN THE BUSINESS ... Metropolitan Life Insurance Co. has bought Sugarland Business Park II, a 60,000-square-foot research and development/office building in Herndon, from Manor Investment Co., a subsidiary of Chevy Chase Savings Bank ... The Washington area offices of Julien J. Studley Inc., a national commercial realty firm, have affiliated here with Zuckerman Kronstadt Inc., a property management firm with headquarters in Bethesda ... Stanley Martin Cos. Inc. is planning 123 single-family homes at Marleigh off Compton Road in Centreville ... The Renaissance Limited Partnership, with Willis-Chalmers Inc. as general contractor and Faller Management Co. as the property manager, is building the 12-story, 330-unit Renaissance apartment building at Tysons Corner ... The Washington D.C. Association of Realtors is holding its annual "Realtour" next Thursday, in which its zoning and new development committee analyzes a commercial area of the city on a block-by-block basis. This year's tour focuses on development along the 14th Street corridor from Thomas Circle to Florida Avenue ... The Washington Building Congress is sponsoring a seminar Monday morning at the Rosslyn Westpark Hotel on getting building permits in Northern Virginia ... Hazel/Peterson Cos. and the Fitness Club of America have signed an agreement to build a membership-only athletic and dining club at Fair Lakes, Hazel/Peterson's office complex west of Fairfax City ... NVCommercial has started work on the $30 million, 280,000-square-foot Old Centreville Crossing shopping center. The 21-acre complex will include 40 shops and restaurants and two low-rise office buildings at the intersection of Braddock Road and Lee Highway ...

PERSONNEL FILE ... Oray R. Nicolai has been appointed vice president/production manager in the residential loan division of Carey Winston Co., a commercial real estate and mortgage banking firm ... Interstate General Co., the developer of St. Charles in Charles County, has appointed Paul Resnik vice president of property management.