Room Additions in Mountain View, CA
Design by M&M helps Mountain View homeowners expand their living space through carefully planned additions — managing design, permits, and construction from concept to completion.
Home Additions

Bedroom Additions
Add more sleeping capacity to the family or guests.

Dining Room Additions
Increase or develop classy eating and entertaining areas.

Family Room Additions
Make living spaces in the middle comfortable and cohesive.

Second Story Additions
Add a second story to maximize your living space

Home Office Additions
Special work areas to get work done.

Living Room Additions
More welcoming spaces to have in day-to-day life.

Bathroom Additions
Additional bathrooms as an addition to enhance convenience.

Kitchen Additions
increases or redesigns kitchen area to cook and hold meetings.

Mudroom Additions
These are practical entryways that are used to control clutter and storage.

Master suite Additions
Private, lavish retreats combined with your house.

Sunroom Additions
Well-lit areas of recreation and relaxation.

Laundry Room Additions
Roomy and neat areas to do laundry.
Home Additions
Design by M&M helps Mountain View homeowners create more functional living space through carefully planned room additions. As a design-build contractor serving Mountain View, Santa Clara County, and the greater Bay Area, we manage the entire process — from early design and feasibility through permitting, construction, and final walkthrough.
Mountain View sits in the heart of Silicon Valley, and demand for housing here reflects it. For homeowners, that often means the smartest path to more space isn’t a bigger house across town — it’s expanding the one they already own. Much of Mountain View’s housing was built in the 1950s and 60s, including the city’s well-known Eichler neighborhoods, and those original floor plans often need updating to serve modern family life.
Additions in Mountain View come with their own considerations — lot sizes that vary widely by neighborhood, mid-century construction methods, and city planning requirements — and our team helps you understand what your property can support before design work ever begins.
Accessory Dwelling Units (ADU)
We specialize in turning underused garages into comfortable, fully permitted living space. Serving Mountain View and nearby communities, our team helps homeowners expand what their property can do — without changing the footprint of the home.
Popular garage conversion projects include:
- Converting a garage to an ADU for rental income or family use
- Creating a home office or studio for remote work
- Adding a guest suite or flexible bonus room
Garage conversions often look simple from the outside, but they involve real construction and compliance work: insulation, electrical upgrades, plumbing (for ADU conversions), egress requirements, and city permitting. We manage those details from the start, so the finished space is safe, legal, and built to last.
Garage Conversions
We specialize in turning underused garages into comfortable, fully permitted living space. Serving Los Altos and nearby communities, our team helps homeowners expand what their property can do — without changing the footprint of the home.
Popular garage conversion projects include:
- Converting a garage to an ADU for rental income or family use
- Creating a home office or studio for remote work
- Adding a guest suite or flexible bonus room
Garage conversions often look simple from the outside, but they involve real construction and compliance work: insulation, electrical upgrades, plumbing (for ADU conversions), egress requirements, and city permitting. We manage those details from the start, so the finished space is safe, legal, and built to last.
Design Build
As a remodeling company in Mountain View, we focus on larger renovation projects that improve how a home functions — not just how it looks. Many Mountain View homes still reflect their original mid-century designs: closed-off kitchens, smaller bedrooms, and layouts that separate rather than connect. Our home remodeling services help homeowners open up living areas, modernize aging systems, and improve flow throughout the home.
Our remodeling services include:
- Whole house renovation — comprehensive updates to layout, systems, and finishes
- Kitchen remodels — typically as part of larger layout improvements or expansions
- Major renovations — reworking floor plans, removing walls, and modernizing older homes
- Renovation paired with additions — improving the existing home while adding square footage
Our remodeling process follows the same design-build structure as our additions and ADU work: feasibility first, then design, budget alignment, permitting, and construction — all managed by one team with clear communication throughout.
Home Remodeling
As a remodeling company in Los Altos, we focus on larger renovation projects that improve how a home functions — not just how it looks. Many Los Altos homes still carry their original mid-century layouts: compartmentalized kitchens, smaller bedrooms, and closed-off living areas. Our home remodeling services help homeowners open up those spaces, modernize aging systems, and improve flow throughout the home.
Our remodeling services include:
- Whole house renovation — comprehensive updates to layout, systems, and finishes
- Kitchen remodels — typically as part of larger layout improvements or expansions
- Major renovations — reworking floor plans, removing walls, and modernizing older homes
- Renovation paired with additions — improving the existing home while adding square footage
Our remodeling process follows the same design-build structure as our additions and ADU work: feasibility first, then design, budget alignment, permitting, and construction — all managed by one team with clear communication throughout.
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 new kitchen.
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!”
Most room additions take several months from initial design through final construction, depending on project size, design complexity, and city review times. Structural work — like tying into a slab foundation or adding a second story — extends the timeline more than a straightforward ground-floor addition. We build permitting into the schedule from the beginning and give you a realistic timeline during your consultation.
Yes. Room additions, ADUs, and garage conversions in Mountain View all require permits and plan review through the city. State ADU law has streamlined parts of the ADU approval process, but projects still need to meet building code, setback, and utility requirements. As a design-build contractor, we prepare the plans, manage submittals, and guide the project through approvals on your behalf.
Yes, but these homes deserve extra care in planning. Slab foundations, post-and-beam framing, radiant heating, and large glass walls all affect how an addition connects to the original structure — and many owners want the addition to respect the home's character rather than fight it. Our design-build process addresses those structural and design questions up front, before construction begins.
The biggest cost factors are the size of the addition, structural work required, site conditions, finish level, and whether utilities or the foundation need upgrades. Homes built in the 1950s and 60s often need electrical or plumbing updates as part of an expansion, which is better to identify during planning than mid-construction. We review your property first, then build a budget around what your project actually requires.
Mountain View's rental demand makes ADUs one of the more compelling homeowner investments in the area. A permitted ADU adds flexible square footage that can serve family today and generate rental income later. The right unit depends on your lot, utility access, and goals — and we help you evaluate feasibility and long-term value before committing to a design.
If you like your neighborhood but your home no longer fits, a remodel or addition is often more cost-effective than buying a larger home in today's market — especially once moving costs and property tax implications are considered. The right choice depends on your lot, your home's condition, and how much space you actually need. A consultation is the easiest way to compare your options with real information about your property.