A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Santa Clara, CA
An ADU is an accessory dwelling unit – a small, fully self-contained home built on the same lot as a main house, with its own kitchen, bathroom, and entrance. In Santa Clara, that usually means a detached backyard cottage, a garage conversion, or an attached addition with a separate entry. The defining feature of Santa Clara ADU work is that the city’s permitting office sees a lot of these projects, which has made the process faster here than almost anywhere else in the Bay Area. If you’re weighing an ADU in Santa Clara, call (669) 266-4319 and we’ll walk you through what’s realistic for your specific lot.
Why Santa Clara Homes Are Different
Santa Clara’s housing stock is overwhelmingly single-family detached homes built between the 1950s and 1970s. You’ll see ranch-style and minimal traditional designs on lots that typically run 5,000 to 7,000 square feet. Those deep backyards are a real asset for a detached ADU, which is part of why Santa Clara has become one of the more active ADU markets in the county. But the same era of construction brings predictable complications. Many of these homes have 2×4 framing, non-standard ceiling heights, and original electrical panels that can’t carry the load of a separate meter plus EV charging. When we scope a Santa Clara project, the panel is usually the first thing on our checklist.
The climate works in your favor in one way: Santa Clara rarely freezes, so insulated foundations and deep frost lines aren’t the headache they are in colder regions. What does matter is summer heat. Dry, warm weather from June through September means an ADU needs good cross-ventilation, Cool Roof materials where possible, and a high-efficiency mini-split heat pump for both heating and the occasional heat wave. Seismic codes are also a factor. Every Santa Clara ADU foundation has to meet California earthquake standards, which often means additional steel and shear-wall detailing that a bid from a less experienced builder may not include.
Our Main Santa Clara Services
Santa Clara homeowners call us most often about three things: adding square footage to the main house, converting an old garage into a rentable unit, and building a detached ADU from the ground up. Each has its own page with local pricing and specifics.
Home Addition Contractor in Santa Clara
A home addition means expanding the footprint of your existing house: a new primary suite, a larger kitchen, a family room, or a second story. In Santa Clara, the big consideration is structural. Post-war homes with 2×4 framing and aging foundations sometimes need reinforcement before an addition can be tied in properly. We’ll tell you that upfront, in writing, before you commit to anything. For the full Santa Clara picture, see Home Addition Contractor in Santa Clara.
Garage Conversion Contractor in Santa Clara
A garage conversion turns your existing garage into a livable ADU with its own kitchen and bath. Santa Clara’s older neighborhoods near Santa Clara University and the Old Quad are full of detached garages built in the 1940s and 1950s, and those garages almost always sit on undersized concrete slabs with no rebar. That means we usually saw-cut and pour new perimeter footings rather than build on the existing slab. A builder who hasn’t done this before will find out at inspection. We plan for it from day one. See Garage Conversion Contractor in Santa Clara for local costs and what to expect.
ADU Builders in Santa Clara
Building a detached ADU from scratch is the most common path in Santa Clara, partly because the deeper lots in neighborhoods like Santa Clara’s older central districts leave room for one. The city’s streamlined ADU ordinance means fewer planning hearings and faster approvals than surrounding cities, which is a real advantage for homeowners who want a unit generating rent sooner. Every Santa Clara ADU we build uses earthquake-coded foundations, a dedicated electrical panel, and a mini-split system sized to the unit’s square footage. Details on pricing and timelines are on ADU Builders in Santa Clara.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Santa Clara
We install and service ADU systems from Tuff Shed, James Hardie, and Abodu, among others. Having local access to these brands keeps parts and materials moving through Santa Clara jobs without long lead times. See our brands for the full list and what we recommend for different lot types.
Pricing for ADU Company in Santa Clara, CA
| Service | Typical Range in Santa Clara |
|---|---|
| Detached ADU (new build, full unit) | $180,000 – $320,000 |
| Garage conversion ADU | $120,000 – $200,000 |
| Attached ADU (addition with separate entry) | $160,000 – $260,000 |
| JADU (junior ADU, under 500 sq ft) | $85,000 – $150,000 |
| Home addition (single room) | $65,000 – $110,000 |
| Home addition (primary suite) | $90,000 – $170,000 |
| Home addition (second story) | $140,000 – $250,000 |
| Electrical panel upgrade (200A) | $3,500 – $6,000 |
| Foundation work for converted garage | $8,000 – $18,000 |
| Mini-split heat pump (single zone) | $4,000 – $8,500 |
What pushes a Santa Clara project toward the high end of these ranges is usually the panel, the foundation, and the seismic detailing. A 1960s ranch with an original 100-amp panel and a garage slab with no rebar will cost more to bring to code than a newer home with a 200-amp panel already in place. Whatever your project looks like, our price is written before any work starts, and it doesn’t change at the door.
Neighborhoods We Serve in Santa Clara
We serve the full city of Santa Clara. The neighborhoods below are just a sample of where we’re working most weeks. When you call, we’ll give you a real arrival window and a live person answers 24 hours a day, seven days a week.
- Old Quad and streets near Santa Clara University
- The old central residential district around Scott Lane
- Neighborhoods off Homestead Road and San Tomas Expressway
- Rivermark and the north Santa Clara area near Mission College
- Pruneridge and the western edge near Central Park
Service Area – Cities Near Santa Clara
Our Santa Clara crews also take jobs in the surrounding cities. We cover San Jose, CA just to the south, Milpitas, CA to the northeast, Los Gatos, CA southwest of us, and Los Altos, CA to the west, across the Cupertino line. If you’re in one of those areas, the same written price and guarantee apply.
Serving Santa Clara, CA - Our Local Coverage Area
We’re based in the Santa Clara area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Santa Clara
Typically, we can start design and permitting within two to four weeks of your written approval. Santa Clara’s city permit office has streamlined ADU reviews, which helps, but scheduling depends on your specific lot and scope. Call (669) 266-4319 and we’ll give you a realistic timeline for your project, not a boilerplate answer.
Most Santa Clara single-family homes aren’t in HOAs, so the city permit is the main requirement. If your home is in an HOA-governed community, state law restricts HOAs from outright banning ADUs, but you will need to check your CC&Rs. We can help you understand the process during your free estimate.
No. The price we put in writing before you sign is the price you pay, unless you change the scope. That’s the whole point of The Kingswell Guarantee. If site conditions uncover something we didn’t anticipate, we bring it to you in writing before doing anything, not after the fact.
Call Lodgewick ADU San Jose at (669) 266-4319 to schedule a free estimate in Santa Clara. A live person answers the phone, and we’ll give you a written number before anything moves forward.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Santa Clara Customers Say
"Converted our garage into a rental studio. The crew was respectful of the neighbors and kept the site clean. It's bringing in rent now and paid for itself faster than I expected."
- Grace Yoon"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild"Added a suite for my dad. They walked us through every cost before a hammer swung and stuck to it. The written price is what we paid, no change orders."
- Ingrid Salazar
