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Floor Plans
ADUs
Property Map
Building Process
Resources

Building Methods

Single Family Homes

Multi Family Homes

Major Remodels

Past Projects

About Us

Land Development Consultant

Blog
Contact Us
More
Green Galaxy Prefab ADUs, CA logo

Green Galaxy Prefab ADUs, CA

Prefab ADUs and manufactured homes from Green Galaxy in Santa Clara, CA. Compare floor plans and prices and see what fits your property.

Accessory Dwelling Units ยท Santa Clara County

A faster, more affordable way to get a better ADU

So your family can move in sooner, or you can rent it out faster for higher profits.

Schedule your consultation See our prefab ADUs
Structurally superior to look better and last longer
Expert guidance through design, approvals and installation
Finished 25% faster with 60% less labor cost
Ideas

What type of ADU are you looking for?

There's no end to what you can use an accessory dwelling unit for. Here are a few of the ways our clients use their Green Galaxy ADU.

Two-story ADU exterior ADU interior ADU living space ADU kitchen ADU bedroom Backyard ADU
Finished ADU in Santa Clara
Benefits, concerns & what to know

ADUs in Santa Clara, done right

Whether it's extra space for family, a rental to offset your mortgage, or a detached office or hobby room, an ADU is a smart, flexible investment that boosts both your property value and your lifestyle.

Budget and timeframe

Streamlined processes and transparent quotes keep your ADU on time, on budget, and free of surprises.

Quality of structure and workmanship

Two decades of experience focused on structural integrity, craftsmanship, and durable finishes.

Advice and support

We know permitting and zoning in Santa Clara County and guide you every step, so you avoid costly mistakes.

20+ years of experience

How we help you get more ADU for your money

We've refined a process that delivers superior quality accessory dwelling units, faster and for less.

Smarter construction, better results

We pre-fabricate major components off-site using Structural Insulated Panels (SIPs) for a quieter, more energy-efficient unit, built faster with fewer weather delays.

Clear pricing. No surprises.

No hidden delivery or installation fees. You know exactly what your ADU will cost before we begin, and we handle permitting, code compliance, and project management.

Guidance you can trust

From design to delivery we walk you through every step, so your ADU is completed exactly as you envisioned.

Why Green Galaxy

More reasons Santa Clara County families choose us for their ADU

Building an ADU is a great way to house family or earn rental income, but there's a lot at stake. Here's what we do differently.

Completed Green Galaxy ADU

Built to look better and last longer

Our in-house team and off-site factory use CAD/CAM production on a coordinated schedule, and our supervisor has never failed an inspection in 45 years.

Premium materials, double the warranty

Structural Insulated Panels are stronger and more stable than green lumber, with a full 20-year warranty that keeps every surface straight and level.

Comfortable, quiet and energy efficient

SIP walls come insulated, so your ADU is quieter, more private room to room, and cheaper to heat and cool for its whole life.

Finished faster so you move in sooner

A stable supply of materials, a reliable in-house team, and factory work unaffected by weather mean your ADU is done 25% faster.

Sustainable and better for the environment

Low-impact methods minimize waste and maximize recycling, with added efficiency, pest resistance and minimal VOCs.

An enjoyable building experience

We optimize your design for your property, arrange all approvals, and keep you updated with direct access to the owner.

Advice for maximum ROI

As triple-licensed real estate professionals, we help you maximize your return. Many clients find their ADU adds double its construction cost in value.

Honest, transparent pricing

No low-ball online prices followed by thousands in extras, and no cutting corners on the foundation and frame you can't see.

Our best advice, 100% free

For 20+ years we've helped Bay Area homeowners add ADUs. We're happy to answer your questions even if you're just exploring.

ADU interior finish
Your no-obligation next step

Get a better ADU, faster and for less

The quickest way to find out more is a no-obligation consultation with our founder, Michael McCarthy. Here's what you'll walk away with:

  • Design clarity: a clearer vision for your ADU, including options you may not have considered.
  • Common surprises: the costly mistakes people make building or buying an ADU, and how to avoid them.
  • Building options: the pros, cons, and comparisons of your alternatives.
  • Pricing: an honest, transparent overview of costs so you can plan with certainty.
  • Process: how our team delivers a superior ADU for a lower price, in less time.

This isn't a sales presentation in disguise. It's our way of sharing 20+ years of experience so you get the exact ADU you want.

Schedule your consultation

Ready to add an ADU to your property?

Tell us about your lot and your plans. We'll help you find the smartest, most economical way to build.

Start your project Browse ADU floor plans

Schedule your free ADU consultation

Tell us a little about your property and we'll reach out to set up a time.

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