About Us
Lamarc Prime Builders is a licensed, Orange County–based design-build construction contractor specializing in Accessory Dwelling Units (ADUs), along with garage conversions, home additions, remodeling, and full residential construction.
They handle the entire project lifecycle—from planning and design through permitting and construction—so homeowners can move forward with clarity and confidence. Their focus is on code-compliant builds, quality craftsmanship, and clear communication, with an emphasis on long-term functionality and property value.
Our Services
Accessory Dwelling Units (ADUs) & Garage Conversions
We design and build code-compliant ADUs and garage conversions that add flexible living space and long-term property value, handling everything from planning and permits to construction.
Home Additions
Our home additions seamlessly expand your living space while integrating with your existing structure, improving layout, functionality, and long-term usability.
SB9 & Lot Development
We guide homeowners through California SB9 projects, including lot splits and additional dwelling units, managing zoning, permitting, and construction with clarity and care.
Kitchen & Bathroom Remodeling
We remodel kitchens and bathrooms with thoughtful layouts, quality finishes, and precise construction—transforming essential spaces into functional, comfortable environments.
Home Improvements
From targeted upgrades to larger improvements, we enhance your home’s comfort, efficiency, and overall value with professional craftsmanship and clear project management.
Exterior Transformations
We transform outdoor and exterior spaces—backyards, facades, and living areas—into well-designed extensions of your home built for everyday enjoyment.
New Construction & Custom Homes
Our team manages ground-up residential construction, delivering custom homes through a streamlined design-build process focused on quality, planning, and execution.
Design & Permitting Services
We handle architectural planning, zoning coordination, and permit approvals—ensuring your project is properly designed, compliant, and ready to build.
How Much Does an ADU Cost in Orange County?
ADU costs in Orange County vary based on unit type, size, site conditions, and level of finishes. Garage conversion ADUs are typically the most cost-effective option, while detached ADUs require new foundations, utilities, and construction, which increases overall investment.
Factors that influence ADU pricing include design complexity, permitting requirements, utility connections, and material selections. Rather than one-size-fits-all pricing, we focus on evaluating your property and goals to provide realistic expectations and a clear path forward.
A professional site evaluation is the best way to understand ADU costs for your specific property.
Every property is different, and early planning helps avoid surprises during permitting and construction.
Built for Quality. Managed with Care.
An ADU is a major investment—so we focus on the details that protect it: solid planning, clean execution, and communication that stays consistent throughout the build.
Whether you’re adding space for family, creating a rental unit, or converting an existing structure, our team works to deliver a code-compliant ADU that feels intentional, functional, and built to last.
A Clear Process You Can Trust
From your first site evaluation to final walkthrough, we keep your ADU project organized and transparent. You’ll know what happens next, what to expect, and how each step moves forward—so you can make confident decisions without the usual construction stress.
Permits Made Simple
We guide you through zoning and permits with local Orange County experience—so approvals feel less overwhelming.
ADU-Focused Expertise
We specialize in ADUs and garage conversions, with a process built for clarity, code compliance, and long-term value.
Why Lamarc Prime Builders Is the Right Choice for Your ADU
Our Proven ADU Process
Each ADU project follows a structured process that guides homeowners from initial evaluation through completed construction with clarity and confidence.
01
Free Site Evaluation
We evaluate zoning, setbacks, utilities, and feasibility to confirm what’s possible on your property.
02
Design & Planning
We create efficient layouts and plans tailored to your goals, budget, and local requirements.
03
Permits & City Approval
Our team manages plan submittals, revisions, and city coordination to secure approvals.
04
Construction &
Completion
Professional construction, inspections, and final sign-off deliver a completed ADU.
