Detweiler's Meetinghouse, located at 3445 Roseville Road, Roseville, Ontario, is the only surviving stone meetinghouse built by Mennonites in Ontario. It was built in 1855 and closely resembles Frick's meetinghouse in Pennsylvania. The meetinghouse replaced an earlier log school & meetinghouse built about 1830 for the congregation then led by Preacher Jacob F. Detweiler and Deacon Jacob H. Detweiler.
The meetinghouse was used until 1966 when it closed (see Detweiler Mennonite Church), and ownership was transferred to the Mennonite Conference of Ontario. It was rented by other Mennonite groups on various occasions. Finally an offer to buy the building led interested Mennonite and non-Mennonite persons to appeal to the conference to preserve the building as an historic site. In 1990 a non-profit corporation, Detweiler Meetinghouse, Inc., was established (incorporation was completed in 1991) and in 1992 the property and adjoining cemetery were transferred to the new board.
The board is made up three persons appointed by the Conference (now Mennonite Church Eastern Canada), three persons appointed by the Mennonite Historical Society of Ontario and additional local community members. The original board members in 1990 who applied for incorporation were Lorna Bergey, Allan Dettweiler, Rae Hilborn, Gerald Musselman, Richard Schiedel and Norman Shantz. Added to the board by 1991 were Tom Hallman, Will Stoltz, Clayton Cressman and Reynold Kipfer.
This board oversaw the restoration of the building which was completed in 1999. Since that time the board has arranged programming (mostly musical because of the stunning acoustics of the space) and sought to rent the facility for weddings, family gatherings, etc.