A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Garage Conversion Contractor Across Los Altos Hills
Garage conversions in Los Altos Hills typically run $185,000 – $340,000 for a full ADU with custom finishes, and most projects take 7 – 11 months once permits clear. The range is wide for a reason: nearly every hillside lot here carries septic, grading, or design-review requirements that flat suburban parcels never face. We plan for that from the first site visit. Our team serves Los Altos Hills residents who want a luxury secondary unit without leaving their property, and we put the full price in writing before anything gets ordered. Call (669) 266-4319 to schedule a free estimate with Russ Delmar and our Garage Conversion Contractor team.
What separates a garage conversion in Los Altos Hills from anywhere else in the Bay Area is the land itself. One-acre minimums, hillside slopes, private septic systems, and a design-review process that expects architectural quality. We know those constraints because we work inside them every month. You’ll get a straight number, a defined schedule, and a written guarantee, not a vague promise from someone who rarely builds above a standard flat lot.
Why Lodgewick ADU San Jose Is Los Altos Hills’s Preferred Garage Conversion Contractor Company
Our crew converted a detached garage on a steep parcel off Purissima Road into a luxury ADU, coordinating with the architect on custom rift-sawn white oak cabinetry and architectural glass while we managed the long-lead windows and specialty hardware. We had to work around a private septic expansion that added two months to the schedule, but our fixed-price contract meant the client never saw a change order for the unexpected site work. That project is what we point to when Los Altos Hills homeowners ask whether we understand hillside builds. We do.
Russ Delmar leads every Los Altos Hills project personally. He walks the site, reviews the septic and sewer situation, and talks through the design-review expectations before a contract is ever signed. Our customers in Los Altos Hills regularly tell us the written price and the 365-Day Done Right Promise are the reasons they chose us over three other bids. A live person answers our phone at (669) 266-4319, 24 hours a day. If you call at 6 a.m. with a question about your permit status, you’ll talk to a person, not a voicemail.
We carry the same guarantee on every build: if the work isn’t right, we come back and make it right within 365 days. That’s in writing, on your contract, before the first framing nail is driven. Background-checked and uniformed technicians appear within the arrival window we give you. The job site is left clean at the end of every day. That’s the Kingswell Way, and it’s how we’ve operated since 2010.
Garage Apartment Conversion in Los Altos Hills
A Garage Apartment Conversion in Los Altos Hills is the process of transforming an existing attached or detached garage into a fully self-contained living unit, complete with its own entrance, kitchen, bath, and sleeping space. On Los Altos Hills hillside lots, these projects almost always involve more than framing and finishes: septic expansion, grading corrections, fire-hardening, and architecture that fits the surrounding natural landscape. A typical garage apartment conversion here runs $210,000 – $340,000, depending on finishes and site work.
Attached Garage Apartment on a Steep Grade
Attached garage conversions on Los Altos Hills slopes need careful structural review. The garage slab was often poured decades ago without consideration for a livable unit above it, and adding plumbing and insulation on a hillside foundation requires geotechnical sign-off. We coordinate that engineering before you pay for a single cabinet.
Detached Garage Apartment with Septic Constraints
Detached garages on one-acre parcels are frequently served by the same private septic system as the main house. Adding a full bathroom and kitchen to a detached garage can push that system beyond its design capacity. We bring in the septic engineer early so you know whether an expansion or sewer connection is required, and what it adds to your budget, before any design gets locked.
Garage Conversion Permit in Los Altos Hills
A Garage Conversion Permit in Los Altos Hills is the planning, engineering, and building-department approval required before converting garage square footage into living space, and it covers everything from structural plans to septic or sewer clearances to design-review conditions. Los Altos Hills has its own planning department with specific requirements for ADU conversions, including setback restrictions, fire-safety materials, and architectural compatibility on view-sensitive hillsides. Permit and design fees on a standard Los Altos Hills garage conversion typically run $8,000 – $22,000 before construction begins.
Septic and Sewer Clearance Before the Permit
Many Los Altos Hills properties still rely on private septic systems, and the town requires proof that the system can handle additional bedrooms and bathrooms before issuing a garage conversion permit. We flag this at the first site walk. If a sewer lateral extension is possible, it can cost $30,000 – $80,000 depending on the distance and slope; a septic expansion usually runs $15,000 – $40,000. Either way, that’s a line item in your written price, not a surprise.
Design Review on View-Oriented Parcels
Los Altos Hills planning staff review garage conversion ADUs for how they sit on the land, particularly on parcels visible from public roads or neighboring ridgelines. Custom millwork, architectural glass, and material choices matter. We’ve gone through this process enough times to know what the town accepts, and we build that into the schedule so you’re not redesigning at month six.
Trusted Brands We Service in Los Altos Hills
We work directly with the materials that Los Altos Hills design review tends to request: James Hardie siding for fire resistance on wooded hillside parcels, custom millwork and architectural glass from specialty Bay Area fabricators, and prefab building systems from Abodu and Cover when the site allows a modular approach. For detached garage conversions where the existing structure is beyond saving, we’ll sometimes recommend a Tuff Shed shell or a comparable panelized system to keep framing on schedule. No matter which product your project uses, we order it early, track the lead time, and hold the written price firm.
Common Garage Conversion Contractor Problems We See in Los Altos Hills Homes
- Construction started before geotech and septic approvals cleared. On hillside one-acre lots, this stalls the project for months and burns through your permit window. We sequence the engineering first, even when it feels slower at the start.
- Custom finishes quoted at generic ADU rates. Architectural glass, rift-sawn cabinetry, and specialty hardware cost more than stock builder-grade materials, and underpricing them leaves contractors stuck mid-project. Your Lodgewick quote includes the actual specified finishes from day one.
- Long-lead materials ordered too late. Custom windows and cabinetry in the Los Altos Hills market can run 10 – 16 weeks from order to delivery. Missing that window turns a 7-month conversion into a 12-month one. We place orders the week the permit is submitted, sometimes earlier.
- Drainage and erosion control treated as an afterthought. Wet winters on hillside lots create runoff that will find a poorly graded ADU slab. We design drainage, retaining, and erosion controls into the site plan, not around the problem later.
Pricing for Garage Conversion Contractor in Los Altos Hills, CA
Here’s what our Los Altos Hills customers can expect as of 2025:
- Standard attached garage conversion to living space: $185,000 – $260,000
- Detached garage conversion to full ADU: $210,000 – $340,000
- Septic expansion or sewer extension, if required: $15,000 – $80,000
- Custom millwork, architectural glass, and specialty finishes: $35,000 – $90,000 added to base scope
- Permit, engineering, and design fees: $8,000 – $22,000
What drives the spread on a Los Altos Hills project? Slope and septic are the two biggest variables, followed by how much custom finishing the design review expects. We give you the written price before you sign a contract, and that price does not change mid-project unless you change the scope. A free estimate from Russ Delmar means a real number, line by line. Call (669) 266-4319 to schedule it.
We Also Serve Cities Near Los Altos Hills
Lodgewick ADU San Jose serves homeowners throughout the South Bay and Peninsula, including San Jose, Fremont, Palo Alto, and Milpitas. If your property sits just outside Los Altos Hills, we’ll still send a fully briefed team that understands hillside lots, septic systems, and design review, not just a generic crew from across the county.
Serving Los Altos Hills, CA - Our Local Coverage Area
We’re based in the Los Altos Hills 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 Garage Conversion Contractor in Los Altos Hills
It means almost every project happens on a hillside parcel with real slope, real setback rules, and enough land that the town expects architectural quality that fits the landscape. Your conversion will likely require geotechnical review, drainage design, and architectural coordination that a flat-lot ADU in another Bay Area city would skip entirely. Call (669) 266-4319 and we’ll walk your specific parcel before you commit to anything.
If your property is on a private septic system and you’re adding a bathroom and kitchen to the garage, the answer is often yes. Los Altos Hills requires proof the system can handle the added bedrooms before a permit is issued. We’ll tell you within the first week whether that’s a $15,000 expansion or a $50,000 sewer extension, in writing. Call (669) 266-4319 for a free site assessment.
Because custom cabinetry, architectural glass, and specialty hardware carry 10 – 16 week lead times, and their prices shift quarterly. We lock your written price before we place the orders, so your contract doesn’t drift upward while you wait on materials. If the work isn’t done right, our 365-Day Done Right Promise brings us back at no cost. Call (669) 266-4319 for the exact number on your project.
In the more rural, wooded areas of Los Altos Hills, yes. The town’s design review and fire-safety codes often require Class A roofing, ember-resistant vents, and non-combustible siding like James Hardie. We build that into your quote from the start rather than discovering it during inspection. Call (669) 266-4319 and we’ll tell you what applies to your specific street.
Sometimes, but not always. If the garage slab is already level and the slope falls away from the structure, you may avoid significant grading. If the slope rises behind the garage, retaining and drainage work becomes part of the project. We’ll tell you the truth after one site visit, and the price is fixed before we start. Call (669) 266-4319 to schedule it.
Written by Russ Delmar, Owner at Lodgewick ADU San Jose, serving Los Altos Hills and the wider South Bay since 2010.
