E&O for Architects and Engineers: What AIA/EJCDC Contracts Require and What It Actually Costs (2026)

Professional liability insurance for architecture and engineering firms costs $7,000 to $50,000 per year at mid-market scale, making it one of the most expensive E&O classifications in the insurance market. The reason is straightforward: when an architect’s design fails or an engineer’s calculation is wrong, people can die, buildings can collapse, and the resulting claims routinely reach $5M–$50M+. A structural defect discovered five years after construction completion generates a claim against the policy in force when the claim is filed — not the policy in force when the design was created. That’s why A/E firms must maintain continuous claims-made coverage for years (often decades) after project completion.

AIA and EJCDC standard contract forms both require professional liability as a default provision. AIA B101–2017 Article 2.5 requires the architect to maintain professional liability insurance for the duration of the project and, in most negotiations, for a specified period after substantial completion. EJCDC E-500 includes similar requirements for engineering services. These aren’t negotiable provisions for firms pursuing institutional and commercial work — they’re table-stakes requirements that determine which projects you can bid on.

A/E E&O Cost by Firm Size

Structural engineering firms pay more than interior design firms at the same revenue level because the severity exposure is categorically different. A structural failure generates wrongful death claims that routinely exceed $10M. An interior design dispute generates property damage claims that rarely exceed $500K. Carriers price this distinction aggressively — structural, geotechnical, and environmental engineering classifications can carry premiums 40–60% higher than architectural or MEP classifications at the same revenue tier.

For Houston-based A/E firms, the construction market’s scale creates both opportunity and exposure. Houston’s commercial construction pipeline — driven by Texas Medical Center expansion, Port of Houston infrastructure, and energy facility builds — means larger project values, higher fee volumes, and correspondingly higher E&O premiums. Firms doing work in the Houston market should also consider how excess liability layers interact with their professional liability program.