Custom Home Builders & Home Addition Contractors in [City Name]

Build a new custom home or expand your existing one. We handle everything from home building design and permitting to full-service construction and project management.

  Custom-Built. NOT PREFAB!

  Permitting & Design Included

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Free 3D Design & Consultation 
for Your Custom Home or Room Addition!

Planning a home addition or custom build? 
We’re offering a free 3D rendering of your project plus a complimentary design consultation to help you visualize your new space before we break ground. Take the first step toward expanding your home today!

FILL OUT THE FORM TO GET STARTED

Built for [City Name]: 
Over 298 ​New Construction & Room Addition  Completed

Whether you're planning a custom home build, a room addition, or expanding your existing layout we bring your vision to life with precision and care. 

Specializing in custom home construction, home additions, and room expansions, we handle every phase from planning and permits to final walkthrough with a focus on craftsmanship, comfort, and long-term value. 

Start your new construction or home addition project in [City Name] today with a team that delivers quality without compromise. Fill out the form above for your free consultation and see how Design By M&M can transform your living space.

61

Custom Homes

112

Room Additions

72

Home Additions

53

New Construction

WHAT WE BUILD

Bump-Out Additions

Design By M&M builds seamless bump-out additions that expand your living space without changing the footprint of your home. Whether it’s a kitchen extension, a larger bathroom, or added square footage in a living area, our home addition contractors in [City Name] deliver tailored expansions that blend perfectly with your existing layout and design.

Front Home Additions

We design and build front home additions that enhance curb appeal and increase livable space. From new entryways and porches to extended living rooms and home offices, every addition is custom-built to match the architecture of your home and meet your specific needs.

Second-Story Additions

Looking to build up instead of out? Our second-story additions give you more space without sacrificing your yard. Whether you’re adding extra bedrooms, a master suite, or a bonus room, our team handles all the structural planning and construction with precision and care.

Garage Additions

From full garage builds to conversions and expansions, we design garage additions that work for your property and your lifestyle. Whether it’s for storage, parking, or livable space above or beside the garage, our garage addition services are built for long-term function and value.

WHY CHOOSE US?

We specialize in custom home building and room additions—handling everything from planning and design to construction—while prioritizing craftsmanship, efficiency, and long-term value. Whether you’re expanding your current home or starting from the ground up, we build around your lifestyle and vision, not cookie-cutter plans. With decades of experience and a growing portfolio of successful builds, we deliver tailored solutions that fit your lot, your needs, and your future.

Custom Designs 
Expert Craftsmanship 
Vendor Network
Efficient Turnaround 

ADDITIONAL FEATURES

Our homes and additions come fully equipped with essential features like open-concept layouts, custom kitchens, spa-style bathrooms, energy-efficient systems, ample storage, and smart home technology — all built for comfort, function, and long-term value.

 ​​​​​​​​​​Design & Planning 

 ​​​​​​​​​​​Structural Framing

 ​​​​​​​​​​Custom Layouts

 ​Room Expansions

 ​Garage Conversions

 ​Master Suites

 ​​​​​​​​​​Open Floorplans

 ​​​​​​​​​​Second Stories 

 ​​​​​​​​​​Permit Handling

 ​​​​​​​​​​Interior Finishes

 ​​​​​​​​​Exterior Finishes 

 Electrical

 ​​​​​​​​​Decks 

 ​​​​​​​​​Porches 

 ​​​​​​​​​​Foundation Work

 ​​​​​​​​​​Turnkey Delivery

 ​​​​​​​​​Flooring 

 Plumbing

PROCESS

Built to Inspire. Designed to Last.

Explore our collection of completed custom homes, home additions, room expansions, and new construction projects across [City Name] and the Bay Area. 

From structural builds to personalized details, every project reflects our commitment to quality craftsmanship, timeless design, and homeowner satisfaction.

F A Q

What’s the difference between a custom home build and a home addition?

A custom home build starts from the ground up—tailored to your vision, lot, and layout preferences—while a home addition expands your existing structure with new rooms or living space.

Do I need permits to build a home addition or custom house?

Yes. Most home additions and new constructions require city permits, inspections, and zoning approvals. We handle all permitting and code compliance as part of our process.

How involved can I be in the design process?

Very. Whether you're building an addition or a custom home, we work closely with you to design the layout, select finishes, and ensure the final product matches your goals and lifestyle.

Can you match the style of my current home with the new addition?

Absolutely. Our room addition contractors specialize in seamless integration—matching materials, rooflines, and architecture to make your addition look like it was always part of the home.

What types of home additions do you build?

We build bump out additions, front home additions, second story additions, and garage additions. Every addition is custom-designed to fit your needs and property.

Do you offer both design and construction for custom homes?

Yes. As full-service custom home builders, we handle everything from architectural planning and home building design to foundation, framing, and final walkthrough.

Want to Ask Something Specific?

Contact us for a free consultation. We’ll walk you through everything step-by-step.

Proudly Serving [City Name] & Surrounding Areas

 San Jose

 Palo Alto

 ​Los Altos Hills

 ​Cupertino

 ​​Monte Serrano

 ​​​San Martin

 ​​​​Daly City

 ​​​​​Mosses Beach 

 ​​​​​​Millbrae 

 ​​​​​​​San Mateo 

 ​​​​​​​​San Carlos 

 ​​​​​​​​​Woodside

 San Francisco

 Stanford

 ​Mountain View

 ​​Campbell

 ​​Los Gatos

 ​​​Gilroy

 ​​​​Pacifica

 ​​​​​Half Moon Bay

 ​​​​​​Hillsborough 

 ​​​​​​​Foster City 

 ​​​​​​​​Redwood City 

 ​​​​​​​​​Menlo Park 

 Santa Clara

 Los Altos

 ​Sunnyvale

 ​Saratoga

 ​​Morgan hill

 ​​​Milpitas

 ​​​​San Bruno

 ​​​​​Brisbane

 ​​​​​​Burlingame

 ​​​​​​​Belmont 

 ​​​​​​​​Emerald Hills 

 ​​​​​​​​​Atherton