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Custom Home Builders & Room Addition Contractors in the Bay Area
From full-scale custom home construction to expertly crafted room additions, Design by M&M delivers high-quality, code-compliant builds tailored to your lifestyle and property.
Build Bigger. Build Smarter.
Whether you’re planning a custom new home or need more space with a room addition, Design by M&M offers complete design-build services from permits to final inspection. We don’t cut corners — every home and addition is built from the ground up using premium materials and local codes.
Our team of custom home builders and home addition contractors handles everything from foundation work to final finishes, ensuring your new space integrates seamlessly with your existing home.
ROOM ADDITION
Room Addition Services
Running out of space? Our room additions integrate seamlessly with your home — both structurally and stylistically — while increasing value and livability. Ideal for expanding bedrooms, creating home offices, or adding guest suites.
- Single Room Additions
- Master Suite Additions
- Second-Story Expansions
- Living Room / Family Room Extensions
- Garage-to-Living Conversions
- Structural & Foundation Work
- Finish Matching to Existing Home
New Construction Services
Our custom home building services are tailored for homeowners who want complete control over layout, style, and finishes. Whether it’s a modern build or traditional home, we manage every detail from the architectural design to final walkthrough.
Included Services:
- Custom Home Design & Planning
- Permit Acquisition & Site Prep
- Full Ground-Up Construction
- Structural Engineering & Framing
- Roofing, Siding, & Exterior Finishes
- Interior Build-Out (Electrical, Plumbing, HVAC)
- Luxury Finish Options & Custom Features
your personal sanctuary
Design in 3 simple steps
Consult & Design
We start with a thorough consultation, creating custom designs tailored to your style and needs.
Expert Construction
Our skilled team manages every detail, from demolition to installation, ensuring precision and quality.
Enjoyment
We complete your project with meticulous attention, ensuring your complete satisfaction and a stunning garden
/ FAQ
Frequently Asked Questions
If you don’t see your question answered here, please don’t hesitate to contact us directly – we’re always happy to help!”
Start Your Project with Us
Ready to build, remodel, or expand? Fill out the form and our team will be in touch to discuss next steps.
Straightforward, professional, and on your terms.
- +1 (650) 899-8968
- design@designbymm.pro
- 100 South Murphy Ave STE 200 Sunnyvale CA 94086
License number #1082131