Frank Lloyd Wright’s Unity Temple


Unity Temple was constructed in 1908-1909 and is a National Historic Landmark. CTLGroup’s role in the restoration of Unity Temple was comprised of a comprehensive survey and evaluation of the concrete’s condition and the development of an ongoing phased rehabilitation plan. CTLGroup evaluated the different types of concrete present in the structure, core samples were taken, studied, and the types of concrete were confirmed and characterized. CTLGroup designed cementitious materials that would be durable and visually match the original materials. It was mandatory that CTLGroup achieve the highest possible aesthetic standards, maintain strict historical accuracy, and protect the integrity of existing building features. Numerous field trial mock ups were performed to verify the material match.

A full condition survey and visual inspection was performed to assist in developing the scope of repairs. The results of the survey were used to develop repair documents and solicit pricing for the restoration work. CTLGroup performed construction observation services throughout the repair phase and designed structural repairs as unforeseen conditions arose. The restoration project was awarded the International Concrete Repair Institute (ICRI) 2017 Award of Excellence Historic Category.


Year of Completion


Year Designated a National Historic Landmark
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