Read across packages
Build an interface matrix using physical systems rather than company names alone. For each connection, identify who supplies, installs, connects, tests, protects and restores the affected work. Compare drawings, specifications and proposal exclusions. Mark uncertain ownership openly; assigning a name internally does not amend that party's contract or establish acceptance.
Resolve before commitment
Send a focused clarification describing the interface and requested allocation. Obtain coordinated responses from the relevant professionals and contractors. Update the scope documents and price comparison together. If responsibility remains unresolved, show the exposure in the forecast and define what must happen before releasing the affected package. Do not conceal it inside a general contingency.
Trace one connection
Consider a hypothetical landscaping package that includes irrigation piping but excludes electrical power to the controller. The electrical proposal excludes landscape equipment. Someone must coordinate design, power connection and testing, with the correct professional review. The lesson is not that one trade automatically owns the omission. It is that the developer needs a documented resolution before treating the total as complete. Use the same method at utility, fire protection, access-control and owner-supplied equipment interfaces.
Take the next step
Review budget completenessGeneral information—not personalized legal, tax, investment, engineering or architectural advice.