Who might be impacted by a requested change or addition in building regulations?

The reasoning behind selecting that specific answer is grounded in understanding the various stakeholders involved in building regulations. When changes or additions are made to building regulations, they primarily affect professionals directly involved in the design, construction, and management of buildings. Designers and engineers will have to adapt their plans and approaches to comply with the new requirements, which can affect timelines and project costs.

Homeowners and builders or contractors are also significantly impacted. Homeowners have a vested interest in ensuring that their properties comply with new regulations for safety, legal, and resale reasons. Builders and contractors need to understand and implement any changes in their practices or workflows to ensure compliance, which can influence their operational methodologies and potential liabilities.

While manufacturers and the general public may feel the broader effects of changes in building regulations—such as shifts in construction materials or processes—the most direct impact is felt by designers, engineers, homeowners, and builders/contractors. This perspective makes them the most relevant stakeholders focused on regulatory changes, thus supporting the premise that the correct answer includes only those directly engaged in the building process.