A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Los Gatos
Adding square footage to a Los Gatos home means dealing with things most contractors in the flatlands never think about: hillside grading, strict hillside overlay zones, and neighborhood design review boards that care about every window trim detail. A home addition in Los Gatos typically runs $180 – $420 per square foot depending on scope, with a 400-square-foot room addition landing between $72,000 and $168,000. If you’re in Los Gatos and need straight answers about cost, permits, or whether your lot can even support the addition you’re picturing, call (669) 266-4319. We work here every week, and we’ll tell you what’s actually possible before you spend a dime.
Lodgewick ADU San Jose coordinates projects across the South Bay from the brand’s San Francisco Bay Area office, with local crews that know Los Gatos streets, slopes, and planning preferences. Russ Delmar leads our team, and he’s walked more Los Gatos lots than he can count. The Kingswell Way applies on every job we take: a written price before work starts, a real arrival window, a clean job site when we leave, and a written guarantee in your hands before the first nail goes in.
Why Lodgewick ADU San Jose Is Los Gatos’s Preferred Home Addition Contractor Company
Los Gatos homeowners tell us the same stories again and again: a contractor gave a verbal estimate, then the price changed once the walls opened up. Someone promised to show up on Monday and called on Thursday. The crew left debris in the yard. That’s why we operate differently, and it’s why word spreads through neighborhoods like Almond Grove, the Glenridge, and the East Los Gatos hills.
Every project we take in Los Gatos gets The Kingswell Guarantee in writing: a fixed price before work begins, a defined arrival window, a job site left cleaner than we found it, and a written guarantee covering the work for 365 days. If something isn’t right, we come back and fix it. No charge. That’s the commitment, on paper, every time. A live person answers our phone 24 hours a day, seven days a week. No voicemail loops when you have a question about an inspection or a change to the plan.
Room Addition Contractor in Los Gatos
A room addition contractor in Los Gatos handles exactly what the name says: building new living space attached to your existing home, whether that’s a family room off the kitchen, a first-floor primary suite, or a dedicated office with proper sound isolation for remote work. Los Gatos homeowners often choose this over moving because their lot gives them room to expand without giving up the schools, the commute, or the neighborhood they already love. A room addition in Los Gatos typically runs $180 – $320 per square foot, so a 300-square-foot bedroom and bath usually lands between $54,000 and $96,000 depending on finishes and site conditions.
Working with Your Existing Footprint
On a flat lot near downtown, a room addition often ties directly into the existing roofline. On the hillside, we’re typically working with stepped foundations and retaining walls, which changes both the engineering and the budget. We handle that conversation early so there are no surprises after demolition starts.
Matching Older Los Gatos Homes
Many homes in the Almond Grove district were built before 1940. Matching the original Craftsman detailing matters: siding profile, window mullions, roof pitch. We work with the town’s design review process so the added space looks like it was always there, not bolted on.
Second Story Addition Contractor in Los Gatos
A second story addition contractor in Los Gatos does the kind of project that makes sense when your lot is too steep or too narrow to build outward. Adding a second floor over a mid-century ranch on Blossom Hill Road, for instance, preserves the backyard while doubling the livable space. Second story additions in Los Gatos typically run $250 – $420 per square foot because they involve structural reinforcement, stair placement, and often temporary relocation of the family while the roof comes off. A 600-square-foot upper level usually lands between $150,000 and $252,000.
Structural Reality on Hillside Foundations
Homes built on Los Gatos slopes in the 1950s and 60s often have foundations that weren’t engineered for a second story. Before any framing happens, we evaluate the footing capacity and, when needed, bring the structure up to current code. That’s not an upsell; it’s the difference between an addition that lasts and one that settles.
Keeping the Family in Place
Some families stay in the home through a second story addition. Others move out for six to ten weeks. Either way, we stage the work so the disruption is as short as the engineering allows, and we tell you the honest timeline up front.
Trusted Brands We Service in Los Gatos
We work with names Los Gatos homeowners recognize and trust. For prefab ADU shells and addition components, we have hands-on experience with Abodu and Cover, which speed up framing and reduce on-site waste on tight hillside lots where staging space is scarce. For exterior finishes that stand up to Los Gatos sun and the occasional frost pocket in the canyons, we regularly install James Hardie siding. When a project calls for a detached studio or workshop as part of the addition plan, Tuff Shed structures can be integrated and finished to match the primary home. Because we stock common materials locally for Los Gatos projects, turnarounds stay short when a change order comes through mid-build. We’re not tied to one brand; we match the product to your lot, budget, and the look your neighborhood expects.
Common Home Addition Contractor Problems We See in Los Gatos Homes
- Undersized foundations on hillside homes. Homes built before the 1980s along steep streets in neighborhoods like the East Los Gatos hills often have footings that were sized for a single story. Tying an addition into that foundation without evaluation leads to cracks within a year or two.
- Historic review friction. In the Almond Grove district and other pre-1940 pockets, the wrong window style or roof pitch can stall a permit for months. We know what the review board looks for and design to those expectations from day one.
- Wildfire-adjacent material choices. Los Gatos sits against the wildland-urban interface. Additions in the hills need fire-resistant siding, ember-resistant vents, and defensible-space planning built into the design, not added as an afterthought.
- Microclimate insulation surprises. A sunny lot off Shannon Road and a shaded canyon lot two miles away need different insulation strategies. Los Gatos frosts on winter nights in the canyons while sitting warm and dry on the flats, and that swing shows up in energy bills if the addition isn’t insulated correctly.
Pricing for Home Addition Contractor in Los Gatos, CA
Here are honest ranges for the work we price every month in Los Gatos. A room addition runs $180 – $320 per square foot. A second story addition runs $250 – $420 per square foot. A sunroom or bump-out addition on the flatter lots near Lark Avenue runs $130 – $200 per square foot for a standard design. A bathroom addition typically lands between $35,000 and $75,000 depending on whether it involves moving plumbing through a slab or a crawlspace. What moves the number in Los Gatos more than anywhere else is the lot: slope, soil, and access for equipment. We’ll walk your property, review the town’s hillside overlay requirements for your parcel, and give you a fixed, written price before any work starts. The estimate is free, and the number you get is the number you’ll pay. Call (669) 266-4319 to schedule yours. We’re also your Home Addition Contractor team for the wider South Bay, and if you’re considering converting a detached garage instead of adding new square footage, our Garage Conversion Contractor in Los Gatos team handles those projects with the same written-price commitment. For a freestanding structure on your lot, our ADU Builders in Los Gatos crew specializes in detached units that avoid the foundation and roofline complications of a full addition.
We Also Serve Cities Near Los Gatos
While this page focuses on Los Gatos, our crews also work in Santa Clara, San Jose, Los Altos, and Milpitas. If you’re just over the border in Campbell or Monte Sereno, call and ask. The scheduling is handled from the same Bay Area office, and the crews know the permitting differences between Los Gatos and the surrounding towns.
Serving Los Gatos, CA - Our Local Coverage Area
We’re based in the Los Gatos 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 Home Addition Contractor in Los Gatos
Most Los Gatos additions start within four to eight weeks of the signed contract, with the biggest variable being the town’s permit and design review timeline. Homes in historic districts can add several weeks to that. We’ll give you a build schedule in writing once we see your lot and the scope. Call (669) 266-4319 to get a timeline for your specific address.
Yes. We prepare the plans, submit the permit application with the Town of Los Gatos, and show up for any design review committee meetings on your behalf. If your property falls in a hillside overlay zone, which covers many steep lots in the eastern part of town, we handle the additional geotechnical and grading review requirements as part of the fixed price. The written quote covers the permitting work; you won’t get a surprise line item for paperwork.
Generally, yes by 10 to 20 percent. Los Gatos lots more often involve slope, retaining walls, and design review conditions that don’t apply on flat Santa Clara or San Jose parcels. A 400-square-foot room addition that costs $72,000 in parts of San Jose might run $85,000 in Los Gatos because of grading and foundation work. Our quotes are line-itemed so you can see exactly where the slope adds cost.
We work throughout Los Gatos, including the Almond Grove district, the Glenridge neighborhood, the East Los Gatos hills, the flats near Lark Avenue, and homes off Blossom Hill Road and Shannon Road. There’s no part of the Los Gatos zip codes we won’t schedule. Call (669) 266-4319, and a live person will confirm your address.
Every project carries our 365-Day Done Right Promise in writing: if anything on the addition isn’t right within the first year, we return and make it right at no charge. That covers workmanship on framing, drywall, roofing, windows, and everything else we touch. The guarantee is handed to you on paper before construction starts. If something fails inside that window, call (669) 266-4319 and a live person answers, any hour of any day.
Talk to a Los Gatos Addition Specialist
You deserve a real number before you commit, a real arrival window on the schedule, and a written promise that the job will be done right. That’s what The Kingswell Way means on every project we take in Los Gatos. Call (669) 266-4319 today for a free, no-pressure estimate. We’ll walk your lot, answer your questions honestly, and leave you with a written price you can plan around.
Written by Russ Delmar, Owner at Lodgewick ADU San Jose, serving Los Gatos since the company’s founding in 2010.
