Home & Business
Additions
in Marin & Santa Clara Counties
Expand your footprint with expert additions. From second-story residential expansions to commercial footprint extensions, we deliver high-quality, seamlessly integrated spaces.
via Thumbtack
These accreditations and the 32 five-star Google reviews reflect our original Marin County (San Rafael) office. Our South Bay office is newer and is building its own review history and directory listings.
Three stages, one seamless property expansion.
Every residential or commercial addition we execute in Marin and Santa Clara Counties moves through a disciplined contractor process, ensuring code compliance, transparent budgets, and minimal disruption.
Design, Zoning & Setbacks
We evaluate your lot limits, review architectural feasibility, establish project scope, and provide a transparent, fixed-price proposal.
Structural Engineering & Permits
Our team coordinates architectural blueprints, foundation engineering, Title 24 calculations, and manages city approvals and building permits.
Foundation, Framing & Finishing
From pouring new footings and tying into existing rooflines to premium finishes and final inspections, we deliver a turnkey addition.
Every trade, permit, and structural tie-in, orchestrated by one master builder.
Building an addition demands rigorous coordination across architectural planning, foundation engineering, structural framing, Title 24 energy standards, and artisan finishes. As licensed general contractors, we manage your entire expansion under one unified contract.
Ground-Floor Extensions
Expanding your footprint outward to create larger living rooms, expanded kitchens, or increased ground-level commercial space.
Second-Story Additions
Adding entirely new levels to existing single-story structures, requiring extensive structural engineering and reinforced foundations.
Commercial Expansions
Increasing warehouse capacity, retail square footage, or expanding dining areas to accommodate business growth and high traffic.
Attached ADUs & In-Law Suites
Seamlessly integrated accessory dwelling units and guest suites that share walls with your primary structure for expanded living.
Sunrooms & Enclosed Patios
Conditioned indoor-outdoor transitional spaces featuring expansive glazing, proper insulation, and integrated HVAC systems.
Structural & Foundation Engineering
Complex foundation tie-ins, load-bearing wall removal, sheer wall integration, and complete structural planning for safe, code-compliant expansions.
Realistic timelines. Zero guesswork. Built around you.
Property additions require strict adherence to municipal codes and structural milestones. By completing architectural drawings, securing city permits, and procuring materials before breaking ground, we keep on-site build times fast and predictable.
Maximize your property's potential. Expand your footprint.
Strategic additions provide the extra space you need without the hassle of relocating, allowing you to maximize the utility and equity of your existing property.
Increased Square Footage
Whether you need more room for your growing family or expanded capacity for business operations, a custom addition delivers the exact space you require.
Seamless Architectural Integration
We match existing rooflines, foundation elevations, and exterior finishes so your new space looks like it was always part of the original structure.
Boosted Property Value
High-quality additions are one of the most effective ways to build equity, generating a strong return on investment for both homeowners and commercial property owners.
Real Results, Spaces Built to Perform
Hear directly from Marin and Santa Clara County property owners, homeowners, and business leaders who trusted Clear Design & Build for their structural additions and expansions.
Hear What Our Clients Have to Say
"Our Entire Living Floor Feels Like a Modern Masterpiece"
An expansive kitchen and living room transformation featuring open-concept wall removal, custom millwork, and cohesive modern finishes.
"From Start to Finish, the Experience Was Flawless"
A whole-home remodel including structural changes, new flooring, lighting design, and a modernized open floor plan.
Let's Build Something Extraordinary
Ready to expand your home or start a commercial addition project? Schedule a free consultation with Clear Design & Build today.
Book A Free ConsultationReal answers about home and commercial additions, straight from the contractor.
Property additions involve strict municipal zoning codes, setback regulations, Title 24 energy calculations, and complex structural engineering. Here is what homeowners, business owners, and property managers need to know before breaking ground in Marin or Santa Clara Counties.
How do you handle zoning laws, property line setbacks, and municipal building permits?
Expanding your property's footprint requires strict adherence to local zoning ordinances and lot setback requirements. Our team handles complete architectural drafting, lot surveys, engineering calculations, plan check submittals, and coordinates directly with city planning departments to secure approved building permits efficiently.
Can we remain in the property or keep our business open during an addition?
Yes. We routinely structure our build schedules to accommodate active homes and businesses. We erect temporary weatherproof and dust containment barriers, establish safe site access routes, and coordinate major structural tie-ins to keep your daily life or business operating with minimal disruption.
How do you ensure the addition matches the style of our existing building?
Seamless integration is our priority. We carefully match existing rooflines, foundation elevations, exterior cladding, and architectural trim. We source materials that blend perfectly with your current structure, ensuring the new space looks like it was always part of the original design rather than an afterthought.
What are the typical timelines and milestone schedules for an addition?
Most home and business additions take between 8 to 16 weeks of active construction, following 4 to 8 weeks of architectural planning, engineering, and city permitting. We establish a comprehensive critical-path schedule prior to breaking ground, ordering long-lead materials early to guarantee timely project turnover and final inspections.
How do you handle complex foundation tie-ins and structural engineering?
Every structural addition requires rigorous engineering. We conduct thorough soil and foundation assessments to determine proper load-bearing capacities. Our team manages excavation, new concrete footings, structural shear walls, and roof truss tie-ins to ensure the expanded structure is completely safe, earthquake-ready, and fully code-compliant.