The Project Charter is a foundational document in the WLAN design process. It formally authorizes the project, detailing the objectives, scope, key stakeholders, and providing the project manager with the authority to allocate resources and begin project activities. This document ensures that all parties have a clear understanding of the project's goals and boundaries from the outset.
In contrast:
The Bill of Materials (BoM) lists the hardware and software components required for the project but does not define the project's objectives or scope.
The Work Breakdown Structure (WBS) breaks down the project's deliverables into manageable sections but is developed after the project has been authorized.
The Budget outlines the financial resources allocated for the project but does not encompass the project's objectives or stakeholder information.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process

If the number of APs changes due to budget constraints, a complete redesign is required to reevaluate coverage, capacity, and performance expectations. Increasing transmit power or relying on 2.4 GHz is not a valid solution, as it can result in co-channel interference and poor roaming.
From CWDP-305:
"A design is based on specific coverage and capacity requirements. Any major change, such as reducing the number of APs, requires a full redesign to determine the impact and ensure that business requirements can still be met."
- Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process