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Width
X
Length
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Sqft
Appliances
All appliances (BOSCH)
Quartz countertops, fixtures, cabinets: flat panel or shaker
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Bathrooms
One bathroom
$0
Two bathrooms
+ 35 000 $
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ADU height
8-9ft
$0
10ft
+ ... $
11-12ft
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Distance from main house
0-30ft
+ 3000 $
30-50ft
+ 5000 $
50-80ft
+ 8000 $
Distance from us (San Jose, 328 N 19th St)
0-30mi
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Estimated total price for Your ADU
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n'guoran jean yves
n'guoran jean yves
We simply love what this company did for us. Thank you guys.
Nidhi Adroja
Nidhi Adroja
We went with Golden State Designs to build our 500 Sq Ft custom cottage. Gad and his crew were a pleasure to work with. From the start to finish, the process was smooth, professional and efficient. Gad has always worked with us throughout the process to address any issues or adjustments. We would highly recommend Golden State Design to anyone looking for a reliable contractor. We are extremely happy with the end result of our construction. Thank you Gad and team!
Jacob Abikzer
Jacob Abikzer
Gad and his team were very responsive to our needs and professional in achieving our goals.....so refreshing to work with such a company with values....I would not hesitate to recommend his services!
n'guoran jean yves
n'guoran jean yves
We simply love what this company did for us. Thank you guys.
Nidhi Adroja
Nidhi Adroja
We went with Golden State Designs to build our 500 Sq Ft custom cottage. Gad and his crew were a pleasure to work with. From the start to finish, the process was smooth, professional and efficient. Gad has always worked with us throughout the process to address any issues or adjustments. We would highly recommend Golden State Design to anyone looking for a reliable contractor. We are extremely happy with the end result of our construction. Thank you Gad and team!
Jacob Abikzer
Jacob Abikzer
Gad and his team were very responsive to our needs and professional in achieving our goals.....so refreshing to work with such a company with values....I would not hesitate to recommend his services!

Compare us to others...

We are the most affordable ADU construction company in the whole Bay Area
Contact us now

Our latest projects

500 sqft studio
750 sqft unit
Backyard ADU in California
spetsymarketing_Cozy_modern_house_white_with_ramp_tropical_flor_a4108866-a9b1-430d-b2d9-971d24625804

Why Choose Us

Profitable investment

With more than 15 years of experience, we are here to guide you through every step with the goal of making your ADU project your most profitable investment yet.

100% on site construction

We build the unit from start to finish on your lot: no size limitations, no dangerous craning, no hassle.

Read more on why you shouldn’t prefer off site construction here

Fully custom

Each of our ADUs is completely unique and custom to your taste. Nobody will have the same ADU in their backyard as you.

Book a free call

Financing Options

Home equity line of credit (HELOC)

HELOCs provide a flexible option for financing ADU projects for homeowners with sufficient equity, despite potential higher interest rates and fees.

Refinance Your Existing Mortgage

Cash-out refinancing allows homeowners to potentially lower rates and integrate ADU costs into their mortgage, based on current home value vs. remaining mortgage balance.

New loan

Construction loans offer flexible ADU financing based on future property value, requiring a solid plan and financial health, with inherent risks like cost overruns.

Client Testimonials

“Absolutely thrilled with our ADU! The team's knack for elegant, modern and space-saving designs turned my vision into reality. Highly recommend to anyone looking to increase the value of their property!”
Adam Diener
⭐⭐⭐⭐⭐
“Thanks to Golden State Designs, we've added a fantastic 750sqft ADU that's now generating rental income. Gad's advice on design and functionality maximized our investment. Truly a game-changer for us!”
Ruth Hanson
⭐⭐⭐⭐⭐
“We bought a 1000sqft ADU and were blown away by the innovative design and efficient use of space. The attention to detail and the quality of construction exceeded our expectations. Highly recommend, thanks Gad!”
Dewey Graham
⭐⭐⭐⭐⭐

Meet the mastermind behind GSD

Gad founded Golden State Designs in 2006; he is a second generation general contractor.

Gad and his team have been delivering great experiences to their customers in the Bay Area since 2014.

Book a free call

Gad Petel

The CEO of Golden State Designs

The founder of Golden State Designs,

Gad Petel

Gad founded Golden State Designs in 2006; he is a second generation general contractor.

Gad and his team have been delivering great experiences to their customers in the Bay Area since 2014.

Book a free call

Cons of off-site construction

You’ve probably heard people get their ADUs craned into their backyard after it has been built in a factory.

But it isn’t as good as it sounds, here are some things you should consider when you go with a factory-built ADU: 

  • Your choices in shape, size, and design are constrained by transport limits.
  • Crane operations pose significant safety risks.
  • Damage during transit is not uncommon

 

At Golden State Designs, we believe your home should be as unique as you are. That’s why we specialize in fully customized, on-site constructed ADUs tailored to your vision.

Say goodbye to one-size-fits-all solutions and hello to a home that truly reflects you!

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