San Diego Home Addition Contractor
Free Consultation • Transparent Pricing • Licensed & Insured
OSSC Construction helps San Diego homeowners add bedrooms, living space, second stories, garages, and connected additions with careful planning and quality craftsmanship.
No obligation • 2-minute response
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Your Addition Starts Here
A well-planned addition should feel connected to the home you already love. OSSC Construction helps homeowners create more space with clear planning, coordinated construction, and thoughtful finish details.
Start to Finish
Adding onto your home requires coordination between the existing structure, new layout, exterior details, and finish selections. OSSC Construction keeps the process organized.
We discuss the space you want to add, how it should function, and what matters most for your home.
Our team reviews the current structure, layout, access, and important planning considerations.
We help align the design direction, construction scope, selections, and pricing expectations.
We help coordinate the steps needed before construction begins so the addition is properly planned.
Your addition is built with steady communication, careful tie-ins, and a final review of the completed space.
Transparent Planning
Home addition costs depend on size, structure, tie-ins, finishes, utilities, and permitting requirements. OSSC Construction helps you understand the scope before moving forward.
Starting Range
$120K - $250K
Starting Range
$250K - $500K+
Starting Range
Custom Quote
Final pricing depends on project size, site conditions, finish selections, utilities, permits, and overall scope.
Why Homeowners Choose OSSC
The best additions feel like they were always part of the home. OSSC Construction focuses on planning, structural coordination, and finish details that help new space blend with the existing property.
Layout, flow, and exterior details are reviewed so the addition feels intentional.
Important tie-ins, framing, utilities, and access points are considered before work begins.
A clear scope helps homeowners understand what is included and how the work will move forward.
Steady coordination helps reduce confusion and keeps communication clear throughout the project.
Compare Your Options
Clear planning. Better communication. Real accountability.
Common Questions
Have questions before adding onto your San Diego home? Here are a few things homeowners often ask before starting.
OSSC Construction can help with bedroom additions, living space additions, primary suite expansions, garage additions, second-story additions, and other residential expansion projects.
The answer depends on your lot, existing structure, zoning, setbacks, utilities, and the type of addition you want. OSSC Construction can review the project goals and help identify the next planning steps.
The goal is to make the new space feel connected to the existing home. Layout, exterior details, rooflines, materials, finishes, and interior flow are all part of the planning process.
Pricing depends on the size, structure, foundation, utilities, finishes, access, and permitting needs. OSSC Construction can help you understand a realistic range after reviewing the scope.
In many cases, homeowners can remain in the home, but it depends on the scope, access, utility work, and safety considerations. OSSC Construction can discuss this during planning.
What Happens Next
Share your goals, timeline, and project details so OSSC Construction can help you understand the best path forward.
Ready to Start?
Tell us what kind of space you want to add. OSSC Construction will help you understand the next steps for planning, pricing, and construction.
What Our Clients Say
We take pride in creating a build experience that feels organized, collaborative, and detail-conscious from the first conversation through final completion.
Sapphire Builders
We build homes and remodel spaces with a focus on quality, proportion, comfort, and the details that shape how people actually live.