You do not have to protect an entire house at once. Start with one priority wall, a bedroom, safe room, residential vault, document area, or another important space, then expand later if needed.
Level 3 is commonly used for higher-risk handgun protection, including specified .44 Magnum threats. Level 7 is tested for multiple specified 5.56mm / M-16-class rifle shots.
A written quote can include panels, seam-protection battens, freight, tax when applicable, delivery requirements, and the current estimated five-week manufacturer production time.
Before work begins, ask your local building department whether permits, plan review, or inspections are required. Your contractor and local officials make the project-specific code and installation decisions.