GMP & Completion Dates - 410.1

The ConsensusDocs 410.1 – Amendment to Set GMP and Completion Dates is a critical companion document to the ConsensusDocs 410 Owner and Builder Agreement (Cost of Work Plus Fee with Guaranteed Maximum Price). This amendment formalizes the essential project terms including the Guaranteed Maximum Price (GMP), substantial completion date, and final completion date, ensuring that both parties have a clear understanding of project scope, cost, and timeline.

In the design-build project delivery method, construction often begins before final design documents are complete. The 410.1 Amendment enables the Owner and Design-Builder to proceed confidently by defining the GMP once sufficient design development has been achieved. This structure provides financial certainty and legal clarity, two key elements for the successful execution of a construction project.

Beyond establishing GMP and key dates, the ConsensusDocs 410.1 also allows for the inclusion of multiple customizable exhibits to clarify project-specific terms. These exhibits can address:

• Project specifications and scope details
• Allowance items and budget allocations
• Assumptions and clarifications made during the design and estimating process
• Schedule of work and construction milestones
• Alternate pricing options
• Unit pricing for materials or services
• Additional services requested beyond the base agreement

By using ConsensusDocs 410.1, Owners and Design-Builders can avoid ambiguity, reduce the risk of scope creep, and better manage changes that may arise during the construction process. It provides a transparent, organized method to document mutual agreements and ensure alignment between all project stakeholders.