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)
<cite index="1-39">Foster City is a master-planned city located in San Mateo County, California</cite>. <cite index="1-40,1-41">It's considered part of Silicon Valley for its local industry and proximity to Silicon Valley cities, with notable companies like Gilead Sciences and Zoox headquartered here</cite>. <cite index="1-45">Foster City is one of the United States' safest cities</cite>.
Foster City
CA Service Area
Communities we serve
Foster City
Emergency response available 24/7
<cite index="12-1">Foster City has a median household income of $199,143</cite>, attracting homeowners who demand quality craftsmanship. Our team specializes in high-end remodeling, kitchen and bathroom upgrades, and custom additions for discerning Peninsula residents.
<cite index="1-47">With median home prices around $1.4 million</cite>, Foster City properties require experienced contractors who understand premium construction standards. We deliver meticulous attention to detail on every project.
From foundation repair to complete home remodels, GS Design and Build handles the full scope of residential construction. We're licensed, insured, and committed to transforming Foster City homes with integrity and expertise.
At a glance
GS Design and Build serves Foster City and surrounding Peninsula communities with full remodeling, construction, and home improvement services.
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.
Worked with us?
Leave a Review
Serving Foster City
Our crew knows Foster City. We will show up on time, assess the job honestly, and give you a clear written number before asking you to decide anything.
Also serving across the panhandle:
Common questions from Foster City homeowners about our services, process, and coverage.
<cite index="1-39">Foster City is a master-planned city located in San Mateo County, California</cite>. <cite index="1-40,1-41">It's considered part of Silicon Valley for its local industry and proximity to Silicon Valley cities, with notable companies like Gilead Sciences and Zoox headquartered here</cite>. <cite index="1-45">Foster City is one of the United States' safest cities</cite>.
We cover all of Foster City, including Belmont, San Mateo, Redwood City, Atherton and surrounding communities. Travel does not affect our pricing — you pay for the work, not the drive.
Our crew is based in Campbell, which puts us within a short drive of all Foster City communities. Our roofing work is backed by 17 years of local building experience across the panhandle.
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