William K. Gerrish Sr., who worked in Washington in commercial development and as vice president of the John G. Webster Service Co. contracting business, died Feb. 14 at a hospital in Palm Beach County, Fla. He was 65.

The cause was congestive heart failure due to a lung ailment, said his wife, Denise Gerrish. Mr. Gerrish had homes in Chevy Chase, Md., Manalapan, Fla., and Bethany Beach, Del.

Mr. Gerrish joined Webster, a Washington-based plumbing, heating and air conditioning contracting business that was operated by his father-in-law, in 1979. He served as vice president for about two decades before the family sold the business.

Also with his father-in-law, Mr. Gerrish worked in commercial development and built several office buildings on New York Avenue Northeast in the early 1980s, his wife said. Mr. Gerrish continued working in commercial development until about five years ago.

William Kenyon Gerrish was born in Minneapolis and spent part of his youth in Montgomery County. He was a 1966 graduate of Bethesda-Chevy Chase High School and received a bachelor’s degree in English from Virginia Tech in 1971. In the earlier years of his career, he worked in Washington as a financial adviser.

Mr. Gerrish was a past board member of Columbia Country Club in Chevy Chase.

Survivors include his wife of 35 years, Denise Webster Gerrish, who resides mainly in Manalapan; two children, William K. Gerrish Jr. of Bethesda and Linda G. Lynch of the District; two brothers, David C. Gerrish Sr. of Warrenton, Va., and James P. Gerrish of Murray Hill, N.J.; and a granddaughter.

— Emily Langer