The most popular modular home addition is one that is attached to the side of a home to create a separate living quarters. This is often known as the Mother-In-Law Quarters or a Dawdy Haus. You can incorporate as many rooms or living areas as you need, including a kitchen, living spaces, and bedrooms.

Modular additions generally cost $200,000 to $300,000, but Winn says many of his clients opt for high-quality exterior materials and interior fixtures and finishes that can increase the cost to $400,000.

The cost of a modular clean room can vary substantially. However, most experts say that this type of clean room typically costs anywhere from $100 to $150 per square foot. That would put the average cost of a 10′ by 10′ cleanroom at $10,000 to $15,000, depending on the controls and specifications needed.

Modular construction is a great way to build additions. You get the quality and price advantage that modern modular homes are known for along with faster build time.

Many people assume the main attraction to building a modular home addition is the price. It’s true they are cheaper to build than a conventionally built home addition, but that is just one of the many reasons why a modular home can be better than a custom built home.

SAVING YOU MONEY NOW A modular home can be installed on any lot in California, in any neighborhood, without the possibility of discrimination based on where the home was built, so long as it conforms to the local zoning requirements and the California Building Code (CBC).

Home addition costs by square footage

Home addition costs by square footage