ADU Construction
Custom ADU construction in Campbell, CA. Legal, permitted accessory dwelling units for your property.
- ADU Design & Planning
- ADU Permitting
- ADU Construction & Build
- Garage Conversions
- Junior ADUs (JADUs)
GS Design and Build · Campbell, CA
From custom ADUs and full home remodels to kitchen transformations and architectural additions — GS Design and Build brings 15 years of award-winning craftsmanship to Silicon Valley homeowners who demand the best.
Certified
Insured
Reliable
Honorable
Experienced
From emergency tarping to full reroofs and wind mitigation reports, we help you choose the right roof work without pressure or guesswork.
Custom ADU construction in Campbell, CA. Legal, permitted accessory dwelling units for your property.
Complete interior remodeling services — from full home transformations to kitchens, bathrooms, and custom cabinetry — all under one roof.
Exterior upgrades and repairs to strengthen and beautify your home's outside.
Design Your Dream Project — our in-house architects and designers manage every step, from initial concept to final city approval.
Not sure whether you need repairs, remodeling, renovations, or a full rebuild? We'll assess your project at no cost.
17+
Years Serving
Santa Clara County
GS Design and Build is a family-owned construction company based in Campbell, CA. We serve homeowners across the South Bay and Peninsula with residential construction work that is built to last. From ADUs and full home remodels to kitchen and bathroom renovations, we handle projects of all sizes with care and precision.
Our founder, Gershon (Geri), has spent 15 years working in residential construction across the Bay Area. He started GS Design and Build because he saw a gap in the market: homeowners needed a contractor they could actually trust, one who showed up, communicated clearly, and delivered work they were proud of. That mission still drives every project we take on.
We believe great construction starts with great communication. Our streamlined process keeps you informed and in control from the first conversation to the final walkthrough.
Tell us about your project — ADU, remodel, or addition. We listen to your goals and answer questions about scope and next steps.
Our team develops detailed architectural plans tailored to your vision, budget, and site — setting the foundation for a smooth build.
We handle all permit applications and coordinate with city and county agencies to secure approvals and keep your project on schedule.
Our crew executes the work with precision and care. You receive regular updates while we manage quality checks and site cleanliness.
We walk through the finished project with you, address any last adjustments, and hand over your completed space with confidence.
We handle all permits, inspections, and cleanup. You approve each phase before we move forward.
Based in Campbell — serving every corner of CA Service Area.
Los Gatos sits in the Santa Cruz Mountains foothills with tree-lined streets and established residential neighborhoods. The area spans from downtown's walkable core to hillside properties with varied lot sizes and architectural styles. Local homes often feature mature landscaping and custom updates.
Cities & Communities We Serve:
Palo Alto, Mountain View, Los Altos +1
San Mateo, Burlingame, San Carlos +1
San Jose, Santa Clara, Milpitas +1
Fremont, Milpitas, San Jose +1
Redwood City, San Carlos, Atherton +1
Sunnyvale, Mountain View, Santa Clara +1
Menlo Park, Atherton, Palo Alto +1
Burlingame, San Mateo, San Carlos +4
Redwood City, Belmont, Menlo Park +4
San Mateo, Hillsborough, San Carlos +3
Belmont, San Mateo, Redwood City +3
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Answers to the questions homeowners ask most before hiring a contractor. Not seeing yours? Call us. We are straightforward about our process, pricing, and expectations.
We primarily serve Los Gatos, CA, Palo Alto, CA, San Mateo, CA, San Jose, CA, Fremont, CA, Redwood City, CA, Sunnyvale, CA, Menlo Park, CA, Hillsborough, San Carlos, Burlingame, Foster City. If you are outside these areas, call us. We take select projects beyond our standard service radius for the right scope.
Most ADU projects take 4-6 months from permit approval to completion, depending on size and complexity.
Yes. We manage all Campbell city permits, inspections, and code compliance throughout the project.
Costs vary by size and finishes, typically $150K-$300K. We provide detailed estimates after site evaluation.
Call us directly. Real answers, no scripts.
Stop by, call, or book online — we're always nearby when you need us.
Phone
(415) 933-2547Hours
GS Design and Build serves Los Gatos, CA and the surrounding area with professional General Contractor services. Free estimates, clear options, no pressure.
Mon–Fri 8:00 AM - 7:00 PM · Sat Closed · Responses within 2 hrs