Thinking about a home addition for your Staten Island house? This comprehensive guide is your essential starting point. We break down the entire process, from exploring different types of additions like dormers and extensions to navigating the complex NYC DOB permit process. Discover realistic 2025 costs per square foot and get design ideas tailored for classic Staten Island homes like ranches and capes. With 10 interactive tools, this guide will help you plan your project with confidence and avoid costly mistakes.