Two major Washington retailers, Woodward & Lothrop and Garfinckel's plan to build new stores near Baltimore in a shopping center to be opened in 1984 by the Rouse Company of Columbia.

The Baltimore store will be the first there for Garfinckel's, which announced recently it plans to move out of its Washington base and into new markets.

For Woodward & Lothrop, the newest store will be the second step into the Baltimore region and number 17 for the chain. Woodies' first Baltimore unit is now scheduled to open next August.

The new Woodward & Lothrop and Garfinckel stores will be among four major tenants at Painters Mill, a 100-acre regional mall at Painters Mill Road and the Northwest Expressway.

Other major stores in the project will be Bamberger's, the suburban division of R. H. Macy & Co. of New York, and Hutzler's, an eight-store Baltimore department chain.

Rouse officials said the local developer plans to begin building the 150-store enclosed center in 1982. It is in an affluent area of the Baltimore subsurbs where several other major malls have been proposed.

Woodward & Lothrop Vice President William McDonald said the chain is counting on credit to ease before major spending begins on the new store; so high interest rates should not be a problem.

McDonald said Woodies is considering "at least one other store" for its thrust into Baltimore. The Woodward & Lothrop units at Annapolis and Columbia are on the fringes of the market now dominated by Hutzler's and The Hecht Co.

The first Woodward & Lothrop in Baltimore proper is being built at White Marsh, another Rouse Company mall. The White Marsh unit will be a 165,000-square-foot store and Painters Mill a slightly smaller unit of 150,000 square feet.

Five stores in the Baltimore media market would make Woodward & Lothrop a major retailer there and give it greater market penetration than Bambergers, which is also moving into the area for the first time.

Garfinckel's is also expanding into Baltimore by way of Columbia and Annapolis. The Annapolis store is now under construction and Garfinckel's is negotiating for a store in Columbia, Rouse officals said.

Besides its big downtown Washington store, Garfinckel's has six suburban branches and is building at Fair Oaks in Fairfax County and at Georgetown Park at Wisconsin Ave. and M St. NW.

For Rouse, the Painters Mill project is the latest in a series of big Baltimore malls. Later this year Rouse plans to open Harborplace, a downtown center on Baltimore's inner harbor.

Malls at Harundale, Waverly Tower, Mondawmin and the Village of Cross Keys are among Rouse's 41 shopping centers.