A historic window specification can be technically correct and still produce very different bids. Learn how architects can better define restoration scope, allowances, unit prices, mockups, replication, glass, hardware, and unforeseen conditions so GCs can compare bids fairly and owners face fewer surprises.

Historic window restoration requires thoughtful specification to avoid budget surprises, scope gaps, and preservation conflicts. This practical guide helps architects, consultants, and general contractors define restoration scopes more clearly and achieve better project outcomes.