1926
Charles M. Talley leaves the firm of Horace Trumbauer in Philadelphia and moves to Telford, PA. Establishes new architectural firm.

1927
Harleysville National Bank & Trust Company
Harleysville, PA

1949
Trinity Lutheran Church
Lansdale, PA

1954
Paul E. Lederach, Jr. joins Talley's architectural firm.

1955
Harleysville Insurance Company
Harleysville, PA

1957
Central Schwenkfelder Church
Worcester, PA

1962
Souderton Mennonite Home
Souderton, PA

1967
Souderton Area School District
Souderton, PA

1972
Charles M. Talley retires from practice. Paul E. Lederach forms Paul E. Lederach, Jr. P.C. Philip C. Lederach joins firm.

1974
D. Glenn Snyder joins firm adding engineering services.

1981
Philip C. Lederach, RA and D. Glenn Snyder, P.E. are made partners. Firm name is changed to Lederach Associates, Architects + Engineers.

1991
Award of Excelence for Church of the Messiah in Gywnedd, Pennsylvania.

1992
Community Enhancement Award for Elm Terrace Gardens Retirement Community in Lansdale, Pennsylvania.

1994
Community Enhancement Award Merck Sharp & Dohme FCU in Lansdale, Pennsylvania.

1995
Paul E. Lederach, Jr retires from firm.

1997
Award of Excellence for Harleysville National Bank & Trust Co. in Springhouse, Pennsylvania

2002
Moved office into Lederach Homestead built in 1834.

2006
Award for Hatfield Township Administration Building in Hatfield, Pennsylvania.