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ConsensusDocs Publishes First Industry Standard Contract that Integrates Lean Practices for Design-Build Projects

On June 24, the ConsensusDocs Coalition published the ConsensusDocs 431, the industry’s first standard contract document that tailors Lean practices to work with the design-build project delivery method. Lean practices are growing in importance to the AEC industry, because they improve value, efficiency, and relationships. Design-build is an alternative project delivery method that has grown in popularity that offers integrated design and construction services. However, before now, design-build projects have not explicitly incorporated lean practices contractually. Consequently, the ConsensusDocs 431 will help facilitate subscribers to obtain the vast majority of the benefits offered by Lean tools and processes without requiring an integrated project delivery contract.


“Many people believe that you need to have an IPD contract to get the benefits of Lean,” comments Brian Perlberg, executive director and senior counsel of ConsensusDocs. He comments further, “This simply isn’t true. The ConsensusDocs 431 leverages the integration of design-build with the innovation and efficiency of Lean. This is good news because not everyone is ready to sign an integrated form of agreement like the ConsensusDocs 300 IPD agreement that requires three or more parties to all sign the same agreement.”


The Lean Design-Build Addendum coordinates well with the ConsensusDocs 400 series of design-build agreements but can also be easily be customized with other standard design-build agreements as well as bespoke design-build agreements. By providing Lean practices in your agreements explicitly, owners, design professionals and builders have a contractual standard to utilize to collaborate more effectively, rather than rely upon cultural aspirations.


ConsensusDocs standard construction contracts are the only contracts written and endorsed by 40 construction organizations, including AWCI, that collectively represent over 300,000 companies and individuals. With a catalog of 100+ contract documents addressing all project delivery methods, ConsensusDocs contracts incorporate fair risk allocation and best practices to represent a project’s best interests. The Coalition’s organizations collectively represent hundreds of thousands of design professionals, owners, contractors, subcontractors, and sureties. For more information, visit, call (866) 925.DOCS or email

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