When you're in the middle of restoring an old house, the last thing you need is trouble finding a Victorian ceiling medallion, a turned porch pillar, an ornamental plasterer or a tin-roof roofer.

To help, two Arlington old-house buffs have published a listing of Baltimore-Washington-area firms and individuals who can help provide such services and items. Their Old House Sourcebook lists 1,400 resources for restoration products and services.

Anna Dale Sullivan, one of the compilers, spent the past nine years restoring her circa-1896 Victorian house in Arlington and had a difficult time finding moldings and doors to replace damaged or missing items in the house, which had been a rental property. "They weren't readily available--most things were being ground up by bulldozers," she recalled.

So she teamed up with another Arlington resident, Joyce Dale, and started gathering lists of craftsmen and suppliers that make up their 76-page booklet.

Using conservative estimates based on circulation of home-restoration magazines in the Washington area, the women say there are at least 3,000 hard-core restorers here. They note that Victorian styles are now in vogue, and say there is an increasing number of architectural antique shops in the area.

The catalogue lists restoration consultants, stencilers, cabinetmakers and plumbers, and suggests where to find such items as old wood flooring, tin ceilings, hardware reproductions, painted floorcloths and antique lighting fixtures. It lists more than 700 companies.

The sourcebook can be obtained by sending $9.95 to The Old House Sourcebook, P.O. Box 5611, Dept. A, Arlington, Va. 22205. Virginia residents must add 4 percent sales tax, making it $10.35.