Sales of new single-family homes in the Washington area were up 14 percent in July from a year earlier, but down 9 percent from June figures, Housing Data Reports said. There was a total of 2,025 sales in July, HDR said.

Average prices declined in July to $115,300, down 3 percent from a high of $118,800 in January, the local housing specialists reported. HDR attributed this to both price decreases and to the entry into the market of more products in the lower price ranges.

Recent house sales in the District included the following, selected at random from information gathered by Rufus S. Lusk & Son Inc. Northwest

Mr. and Mrs. C. W. Rich sold a house at 4615 Alton Place for $150,000 to Mr. and Mrs. K. Edward Shanbacker. The sellers took back a note for $125,000 at 13 percent for two years.

S. E. Hartikka sold a house at 3740 Appleton St. for $133,000 in cash to Paula Barnes.

E. L. Murphy sold a house at 2250 Cathedral Ave. for $75,000 in cash to Julian Richards.

James Farmer sold a house at 5129 Chevy Chase Parkway for $193,000 in cash to Edgar R. Weisman.

W. G. Lynn sold a house at 2935 Northampton St. for $120,000 to Mr. and Mrs. Harry J. Weiss. The sellers took back a note for $100,000 for 10 years. Southwest

Mr. and Mrs. A. T. Pruitt sold a house at 143 Elmira St. for $50,400 to Thomasine L. Mitchener. Advance Mortgage Corp. placed an FHA mortgage of $49,850.

Catherine Brennan sold a house at 4008 2nd St. for $54,000 to Brian K. Gunter. Inland Mortgage Corp. placed an FHA mortgage of $53,400. Northeast

Mr. and Mrs. Nathan Miller sold a house at 1831 Corcoran St. for $20,000 to Mr. and Mrs. Irving L. Torchinsky. The sellers took back a note for $18,000 at 10 percent.

Mr. and Mrs. K. W. Riegel sold a house at 314 E St. for $165,000 to Mr. and Mrs. Clark R. Silcox. The sellers took back a note for $149,000 for five years.

J. P. Carden and others sold a house at 736 Faraday Place for $53,000 to Janet L. McGriff. Charter Mortgage Co. placed an FHA mortgage of $52,450.

Mr. and Mrs. Nathan Segal sold a house at 4255 Foote St. for $40,000 to Mr. and Mrs. James G. Coble. The sellers took back a note for $32,000 at 12 1/2 percent for 10 years. Southeast

R. C. Zackery and others sold a house at 3309 B St. for $59,000 in cash to Mr. and Mrs. Ulysee Davis.

Foxhall Townhouses Inc. sold a house at 704 Bonini Rd. for $67,000 to Austin A. Caldwell and Susie Cruz. Waterfield Mortgage Co. placed an FHA mortgage of $66,050.

Anna Mangialardo and others sold a house at 3311 Carpenter St. for $76,000 to Mr. and Mrs. Square H. Bunum Jr. Colonial Mortgage Service Co. Associates Inc. placed a VA mortgage of $76,000 at 15 1/2 percent for 30 years.

C. E. Feistritzer sold a house at 411 Kentucky Ave. for $89,500 to Charles B. and Elaine G. C. McVay. Banco Mortgage Co. placed a mortgage of $87,850.