Flexible living space built with privacy, comfort, and long-term value
Licensed ADU Construction Services in San Jose
From detached backyard homes to garage conversions, ClearSky Builders provides ADU construction services across San Jose and the South Bay with clear communication, careful planning, and disciplined execution. We coordinate design details, permits, trades, and inspections so your accessory dwelling unit feels intentional from the first plan to final walkthrough.
What this covers for your accessory dwelling unit
Service Overview
A successful ADU starts with smart planning. We look at access, privacy, utilities, parking, layout, and long-term use before construction begins. Our team coordinates design, pricing, permits, and build sequencing so the finished unit feels complete, comfortable, and connected to the property without disrupting the main home.
Detached ADUs
Backyard cottages, guest houses, rental units, and independent living spaces
Attached ADUs
Additions connected to the main home with careful privacy and access planning
Utility Coordination
Electrical, plumbing, sewer, HVAC, ventilation, and panel capacity planning
Permits and Inspections
Submittals, plan check responses, inspection sequencing, and closeout
Garage Conversions
Existing garage upgrades with insulation, utilities, windows, and living-area finishes
Junior ADUs
Compact living units inside existing home footprints where layout and code allow
Privacy and Access Planning
Entries, pathways, fencing, lighting, storage, and outdoor transitions
Closeout and Warranty
Durable materials, compact storage, lighting, and details that feel refined
ADU planning, permits, and build sequencing from concept to move-in
Our Process & How We Deliver
We align layout, utilities, budget, and schedule early so your ADU moves cleanly from idea to livable space.
- Discovery and Fit
We review your goals, property layout, budget, and timeline, then study access, privacy, utilities, and likely permitting needs. If you are comparing ADU types, we help identify the best path based on use, cost, and site conditions.
- Preconstruction
We align scope, pricing, schedule, and long-lead items before work begins. Utility upgrades, structural needs, finish selections, and permit requirements are reviewed early so construction starts with fewer surprises and a clear path forward.
- Build
Site protection, trenching, foundations, framing, utility rough-ins, envelope work, insulation, drywall, and finishes are sequenced with care. Inspections are coordinated at each milestone so crews stay productive and quality stays consistent.
- Close-Out and Turnover
We complete the punch list, confirm system operation, and assemble care documentation. The final walkthrough verifies comfort, safety, access, storage, and finish quality so the ADU is ready for family, guests, tenants, or flexible use.
- Communication
One primary contact coordinates trades, inspections, and decisions. Weekly updates, photos, and look-aheads keep you informed, while change requests are priced and tracked clearly to protect schedule and budget.
Why Clients Choose ClearSky Builders
You get clear scope, realistic schedules, and careful coordination from planning through the final walkthrough.
- On-time completion
We plan around inspection cadence and long-lead selections to hit your move-in and final walkthrough dates.
- 10% Price Guarantee
After preconstruction, we lock a fixed contract with a strict 10% contingency cap and a 30-day material quote guarantee to reduce volatility.
- Experienced leadership
Every lead brings 10 to 20 years in construction, electrical, and field oversight, which is steady guidance for complex sites and multi-tenant buildings.
- Systems coordination
Venting, electrical loads, panel capacity, plumbing runs, and HVAC plans are confirmed early to avoid late surprises.
- Live-in remodel planning
Work hours, dust control, noise planning, and daily cleanup keep your space usable and protected.
- Code and safety compliance
Practical, compliant solutions integrated without disrupting finishes, comfort, or schedule.
- Transparent updates
You will always know what is complete, what is next, and what is needed from your team.
What Affects Cost and Timeline
Several factors influence costs and schedules. We provide quick, accurate quotes tailored to your space and scope, balancing performance, durability, and compliance so you can open with confidence. Your quote will depend on:
ADU type
Detached unit, garage conversion, attached ADU, junior ADU, or new addition
Structure and envelope
Foundations, framing, insulation, windows, doors, and weatherproofing
Site conditions
Access, grading, drainage, setbacks, trees, and utility locations
Permits and inspections
Plan check timelines, revisions, inspections, and final approvals
Utility upgrades
Electrical panel capacity, sewer tie-ins, plumbing runs, HVAC, and ventilation
Finish level
Cabinetry, flooring, tile, fixtures, appliances, lighting, and storage details
Ready to start? Let’s map your path to the final walkthrough.
Share your plans or a few photos, your wish list, and your target date. We will outline a practical plan for pricing, permits and inspections, selections, and schedule. If you are still defining scope, we can walk the home, confirm options, and flag long-lead items early.
Featured home and renovation in San Jose & the Greater Bay Area
Featured Projects
Each project is a collaboration—clear plans, careful craftsmanship, and thoughtful details that reflect how you live. Explore a few examples of how our services translate into real homes and lasting results across the South Bay.
Los Altos
— Custom Home Build
Ground-up residence, coordinating structure, envelope, and finishes with the design team.
SEE PROJECT PHOTOSCampbell
— Outdoor Kitchen Addition
Outdoor living upgrade integrating hardscape, utilities, lighting, and weather-ready finishes.
SEE PROJECT PHOTOSSerpentine Pavillion
— Commercial Construction
Specialty commercial scope emphasizing safety, code coordination, and durable materials.
SEE PROJECT PHOTOSREAL RESULTS, REAL REVIEWS
Testimonials from Homeowners in San Jose & the South Bay
Here are just a handful of testimonials from real San Jose homeowners that believe we’re a home builder you can trust.
“Professional, organized, and patient.”
ClearSky kept our kitchen renovation on schedule and on budget. Daily updates, a clean jobsite, and solutions when surprises came up. We’d hire this general contractor again.
— Maya P., San Jose
“Our custom home turned out exactly as planned.”
They aligned scope early and coordinated subs flawlessly. As first-time builders, we appreciated how predictable the process felt from permits to final walkthrough.
— Daniel & Priya R., Los Gatos
“Attention to detail on a tricky hillside lot.”
Retaining walls, drainage, and access were handled with care. ClearSky’s team protected neighbors’ property and kept inspections smooth.
— Anthony V., Los Altos Hills
CUSTOM HOME BUILDS, RENOVATIONS AND GENERAL CONSTRUCTION WORK ACROSS SAN JOSE & THE SOUTH BAY
Areas We Serve Across San Jose & Surrounding Areas
Based in San Jose, we work across the South Bay and Peninsula—partnering with homeowners and design teams throughout Alameda, San Mateo, and Santa Clara counties. Don’t see your city? Reach out—we often take nearby work.
Santa Clara County
- Campbell
- Cupertino
- Los Altos
- Los Altos Hills
- Los Gatos
- Milpitas
- Monte Sereno
- Morgan Hill
- Mountain View
- Palo Alto
- San Jose
- Santa Clara
- Saratoga
- Stanford
- Sunnyvale
Alameda County
- Freemont
- Newark
San Mateo County
- Atherton
- East Palo Alto
- Menlo Park
- Portola Valley
- Woodside
FAQ - ADU Construction
Whether you need help planning a home remodel or have custom home construction in mind, our team of expert San Jose home builders is here to answer any questions you have.
We’ve assisted local communities with a variety of projects over the years, from ADUs to luxury homes. Below are some of the most common questions we’ve gotten about our custom home remodeling services.
We’ve assisted local communities with a variety of projects over the years, from ADUs to luxury homes. Below are some of the most common questions we’ve gotten about our custom home remodeling services.
- What types of ADUs can you build?
We can help with detached ADUs, garage conversions, attached ADUs, and junior ADUs when the property and code requirements support the scope.
- How long does ADU construction usually take?
Timelines vary by design, permits, site conditions, utilities, and finish level. Many ADU builds take several months after permits, with preconstruction adding time for pricing and procurement.
- Do you help with ADU permits?
Yes. We coordinate plan submittals, track comments, and schedule inspections so the project keeps moving from permit review through final approval.
- What affects ADU cost the most?
ADU type, utility upgrades, foundation needs, site access, finish level, and permit requirements are usually the biggest cost drivers.
- Can an ADU be used for family or rental income?
Many homeowners build ADUs for family, guests, rental income, or future flexibility. We help plan the layout, privacy, and systems around your intended use.
Related Services
Architectural Design
Tailored concepts that honor your site, light, and lifestyle. We refine volumes, materials, and details into permit-ready plans that set the tone for a flawless build.
EXPLORE ARCHITECTURAL DESIGN
Preconstruction
Decisions made early, dollars used wisely. We align scope, specifications, and schedule so your vision is priced accurately and built without costly detours.
EXPLORE PRECONSTRUCTION
Residential Construction
From additions to whole-home transformations, we deliver structure, envelope, and finish work to a crisp standard, with steady supervision and predictable outcomes.
EXPLORE RESIDENTIAL CONSTRUCTIONLet’s Work Together!
Get your home renovation done by a fully licensed, 5-star-rated team of home builders that shows up fast and does it right.