The method calls the first release a launchpad and describes it as a foundation for collecting user data and improving, not the final product. It also says speed shouldn't come at the cost of value to the user. So the agency is building a working site that covers the pages the strategy ranked first, and the rest of the wishlist waits.
That takes several kinds of work, and the agreement should say who does each. The work includes writing the page content, designing and developing the pages and the reusable components behind them, and moving the pages that carry over from the old site. It also includes setting up analytics so there is a baseline to compare against later. Not every agency staffs all of that itself. Some expect your team to write or to supply subject experts, and that is fine when the scope says so.
In Lean Labs' three-stages article, the build runs as a messaging sprint, a design sprint and a development sprint, and the launchpad with its strategy is priced at $30,000 to $70,000 or more. The design sprint uses a separately named offer, the Design Blueprint, which sets visual direction by redesigning one key page. If an agency quotes a design package like that beside a build, ask whether its fee is included in the build quote. We compare prices across the stages in how much growth-driven design costs.
An agency should also bring a way to get decisions made. The method's launch process recommends time-boxed work and one accountable stakeholder for each page, who gathers everyone else's feedback. When several people approve a page and nobody owns the decision, a build can stall while revisions go back and forth.