Home addition costs in San Jose typically range from $300-$600 per square foot, depending on the complexity, finishes, and type of addition. A basic room addition might start around $150,000, while a second-story addition can range from $300,000 to $600,000+. We provide detailed, itemized estimates during your free consultation so you know exactly what to expect.

Most home additions take 3-6 months to complete, including design and permitting. Simple bump-outs may take 6-8 weeks of construction, while second-story additions typically require 4-6 months. The permitting process in San Jose usually adds 4-8 weeks before construction can begin. We'll provide a detailed timeline specific to your project during planning.

Yes, all home additions in San Jose require building permits. This includes structural permits, electrical permits, plumbing permits (if applicable), and often planning approval depending on your lot's setback requirements. We handle all permitting as part of our service, ensuring your addition is fully legal and up to code.

In most cases, yes. For additions that don't significantly impact existing living areas, you can remain in your home during construction. We take measures to seal off work areas, minimize dust and noise, and maintain access to essential areas. However, for second-story additions or projects requiring extensive structural work, temporary relocation may be recommended for your comfort and safety.

Generally, yes. Well-designed home additions typically return 50-75% of their cost in increased home value, and in the competitive Bay Area market, that return can be even higher. Additions that add bedrooms, bathrooms, or functional living space are particularly valuable. We can help you make decisions that maximize both your enjoyment and your investment.

A home addition expands your existing home and is connected to it, while an ADU (Accessory Dwelling Unit) is a separate, self-contained living unit on your property. ADUs have their own entrance, kitchen, and bathroom, and can be attached or detached from your main home. We build both - if you're unsure which is right for you, we can discuss your needs during a consultation.