A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Novato, CA
Most Novato ADU projects fall between $180,000 and $320,000 for a detached unit, with garage conversions running $95,000 to $175,000 depending on utility work. We’re Sutton ADU Builders, and we handle all three: detached ADUs, garage conversions, and room additions across Novato. What makes Novato jobs different is the housing stock itself – many homes date to the 1960s and 70s, which means any addition often triggers electrical panel upgrades, whole-house repiping, and seismic work before framing can begin. Call (831) 272-7212 for a written price on your specific lot.
Why Novato Homes Are Different
Novato’s aging housing stock changes how an ADU project unfolds. Walk through San Marin or Ignacio and you’ll see the pattern: single-story ranchers and split-levels from the 1960s and 70s, many on lots large enough for a detached unit in the rear yard. That’s the good news. The less visible issue is what’s behind the walls. Original galvanized pipes from that era are prone to corrosion, and Novato’s hard water doesn’t help. When an ADU ties into the main house’s plumbing, we frequently find the existing supply lines need replacement before inspection will pass. Electrical panels from the same period are often undersized for a new dwelling unit’s load, so a 100-amp to 200-amp upgrade is common.
The climate shapes material choices, too. Novato’s warm, dry summers and mild, wet winters mean the ADU envelope has to handle real temperature swings inside a single day. We specify insulation beyond code minimum in most cases and size mechanical ventilation so the unit doesn’t bake in August or collect moisture in January. Winter rainfall also compresses the foundation and utility-trench schedule; we plan those phases around the wetter months and keep the framing phase during the dry stretch when possible. None of this is unusual to us, but it’s exactly why a Novato ADU quote looks different from one in a newer subdivision where the underground is already modern.
Our Main Novato Services
Three types of projects make up the bulk of what Novato homeowners call us about, and each has its own dedicated page with pricing, timelines, and local specifics.
Home Addition Contractor in Novato
A ground-up home addition in Novato means expanding the footprint of an existing house, often on a slab foundation from the 60s or 70s. We handle the structural engineering, the utility extensions, and the interior finish as one scope. On Novato ranchers, a common addition is a primary suite or a family room bump-out toward the rear lot line, which usually requires a setback variance depending on your parcel. For a closer look at how we price and build these, see our Home Addition Contractor in Novato page.
ADU Builders in Novato
Detached ADUs work especially well on Novato’s larger lots, where we can place a 400 to 800 square foot unit without crowding the primary home. Garage conversions are the other common route, turning an underused attached or detached garage into a legal dwelling unit. Both paths require bringing gas, electrical, and sewer service up to current code, and on older Novato homes that often means replacing more of the existing system than the ADU itself. Our ADU Builders in Novato page covers the two approaches in detail.
Room Addition Contractor in Novato
A room addition is a smaller scope than a full home addition: one bedroom, a home office, or an in-law suite added to the existing structure. On Novato’s split-levels, we frequently add a room over the garage or extend the lower level outward. The job still involves foundation work, roof tie-in, and insulation at least as good as the main house, but the price and timeline are smaller. See our Room Addition Contractor in Novato page for the numbers.
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 Novato
We work with several prefab and panelized systems that suit Novato lots. That includes Abodu and Cover units for detached ADUs, Tuff Shed structures for simpler conversion starts, and James Hardie exterior cladding when the finish needs to match the main house. See our brands page for specifics on each product line.
Pricing for ADU Company in Novato, CA
These are the ranges we quote most often in Novato, before any site-specific adjustments.
| Service | Typical range in Novato |
|---|---|
| Detached ADU (400 – 500 sq ft) | $180,000 – $240,000 |
| Detached ADU (600 – 800 sq ft) | $260,000 – $320,000 |
| Garage conversion (attached) | $95,000 – $145,000 |
| Garage conversion (detached) | $120,000 – $175,000 |
| Room addition (200 – 300 sq ft) | $85,000 – $130,000 |
| Room addition (400 – 500 sq ft) | $140,000 – $190,000 |
| Electrical panel upgrade (100A to 200A) | $3,500 – $6,500 |
| Whole-house repipe (galvanized replacement) | $8,000 – $15,000 |
| Foundation / seismic retrofit (typical Novato scope) | $12,000 – $25,000 |
| Utility trenching and sewer tie-in | $6,000 – $14,000 |
What pushes a Novato project toward the top of these ranges is usually hidden scope: a corroded galvanized supply line in San Marin, an undersized electrical panel in Ignacio, or a sewer lateral that hasn’t been touched since the Nixon administration. We write those findings into the estimate before work starts, so the price you approve is the price you pay – no change order arrives silently in month three.
Neighborhoods We Serve in Novato
We work across Novato, from the older subdivisions to the newer hillside lots. Below are a few neighborhoods where we’re regularly quoting and building. Crews stage from our Bay Area office, so scheduling is matched to the local construction calendar rather than a drive from out of county.
- San Marin
- Ignacio
- Downtown Novato
- Hamilton Field
- Bahia
Service Area – Cities Near Novato
Sutton ADU Builders also serves nearby cities across Marin and into the North Bay. If you’re in Fairfax, CA, San Anselmo, CA, Kentfield, CA, or San Pablo, CA, the same written-price standard and Threshold Verified crew vetting apply. Each city has its own page with local conditions and pricing.
Serving Novato, CA - Our Local Coverage Area
We’re based in the Novato 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 Novato
Typical lead time from signed contract to first day on site is 3 to 5 weeks once permits are issued. Novato’s permit review timeline varies by project scope, but we handle the submittal and revision process for you. Call (831) 272-7212 and we’ll give you a realistic start window for your specific property.
Yes. Every structural ADU, garage conversion, and room addition in Novato requires city permits, and we handle the full submittal, revision, and inspection process. Utility work like panel upgrades and repiping requires separate trade permits, which we also pull. Your written estimate includes the permit fees as a line item.
Yes. Every Sutton crew member is background-checked and identity-verified under the Threshold Standard. Before anyone arrives, you receive their name and photo. At the door, they show a photo ID badge. The same standard applies on day one and day ninety of a build. Call (831) 272-7212 to schedule a free estimate with the same standard.
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 Novato Customers Say
"Straight answers on what we could and couldn't do on our lot."
- Edwin H."Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W.
