Studio
350 to 450sq ft
- Open living and sleeping
- Full kitchenette and bath
- Great for a garage conversion
Orange County · Design & Build
More Room for the People You Love
ADUs, garage conversions and custom homes, designed, permitted and built by one team. Room for your parents, your grown kids, or rental income that helps pay the mortgage.
- Free lot check
- Design, permits & build
- Licensed & insured
- One TeamDesign, permits & construction
- One ContractFrom first sketch to keys
- All of Orange CountyBased in Laguna Hills
- Licensed & InsuredCalifornia contractor
Why families build
Some of life's best moments happen when the people you love are close.
A backyard ADU lets your parents age nearby with their own front door. A garage conversion gives your grown kids a place to start out, or brings in rental income that helps pay the mortgage. A new custom home is the one you have pictured for years, finally built around the way your family lives.
Golden Coast carries the whole journey for you: what your lot allows, design, engineering, city permits and construction. One team and one contract, so nothing gets lost between designers and builders.
What we build
Three kinds of homes. Nothing else.
We focus only on ADUs, garage conversions and new custom homes, so every project gets a team that does this work every day.
Detached · Attached · JuniorADUs
A complete second home on your property, with its own entrance, kitchen and bath. Keep your parents close, give your kids a start, or earn rental income.
Explore ADUs
Garage to living spaceGarage Conversions
Your garage already has a foundation, walls and a roof. Converting it is often the fastest, most affordable way to add a comfortable, fully permitted home.
Explore Garage Conversions
New construction · RebuildsCustom Homes
The home you have pictured for years, built from the ground up around the way your family lives. One team accountable from first sketch to move in day.
Explore Custom HomesADU layouts
Four starting points. Every one designed for your lot.
Most families start from one of these sizes. We adjust the layout, finishes and orientation to your property, your city's rules and how you plan to use it.
One Bedroom
500 to 650sq ft
- Private bedroom
- Full kitchen and bath
- Ideal for a parent or a renter
Two Bedroom
700 to 900sq ft
- Two bedrooms, one or two baths
- Kitchen with island
- Strong rental income option
Three Bedroom
up to 1,200sq ft
- Full size family home
- Indoor and outdoor living
- The state maximum for a detached ADU
Sizes are typical ranges. What fits depends on your lot, setbacks and city. We confirm it at your free lot check.
Designed around the way your family lives.
Golden Coast Design and Build
Why Golden Coast
Built on honest communication
We know you are trusting us with your home and your savings. You will always know where things stand and what comes next.
One team, one contract
Design, permits and construction under one roof. No handoffs, no finger pointing.
We handle the city
Plans, engineering and every round of plan check corrections, done for you.
Clear updates
Regular progress updates so you are never left guessing about schedule or cost.
Licensed & insured
A licensed California contractor, fully insured on every project.
Our process
One team from first sketch to final walkthrough
Free consultation and lot check
We visit, listen to how you want to live, and check what your property allows.
Design
We design the space with you, room by room, until it feels right.
Plans and engineering
We prepare the full plan set and engineering.
Permits
We submit to your city and handle every correction until approval.
Construction
Our team builds it, with regular updates so you always know what comes next.
Final walkthrough
We walk the finished home with you and hand you the keys.
What California allows
More of your lot is buildable than you think
1,200sq ft
Maximum size for a detached ADU under state law.
500sq ft
Maximum size for a junior ADU inside your existing home.
4ft
The most a city can require from side and rear lot lines.
0spaces
Replacement parking spaces a city can usually require when a garage becomes an ADU.
Local rules vary by city and lot. We confirm exactly what applies to your property at the consultation.
Inspiration
Homes that inspire our designs
Clean lines, warm light and spaces that feel bigger than they are. Our own project portfolio is coming soon.
Questions
What homeowners ask us first
Can I build an ADU on my lot?
Most Orange County single family lots qualify. We start with a site evaluation to show you exactly what your lot allows.
Do you handle permits?
Yes. We prepare the plans, engineering and city submittals, and manage the permit process through final approval.
What does an ADU cost?
Every lot and design is different. After the consultation we give you a detailed proposal with a clear scope, so you know exactly what you are paying for.
How long does it take?
It depends on your city and the project. We give you a clear timeline at the consultation and keep you updated at every stage.
Can I rent out my ADU?
Yes. In California, ADUs can be rented long term, and many owners use the income to help pay the mortgage.
Are you licensed and insured?
Yes. We are a licensed California contractor and fully insured. Our license number is listed at the bottom of every page.
Free consultation
Let's talk about your project
Tell us a little about what you have in mind. We'll call you back within one business day to schedule your free consultation.
- Phone(949) 288‑4232
- WhatsAppMessage us on WhatsApp
- Emailinfo@goldencoastdesignandbuild.com
- Office23172 Plaza Pointe Dr, Suite 280
Laguna Hills, CA 92653 - HoursSun to Thu 9 AM to 6 PM
Fri 9 AM to 5 PM · Sat closed
