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ADU Garage Conversion in Roseville, CA: Permitted, Priced, and Built to Code

Roseville Renovations builds ADU garage conversions, Junior ADU (JADU) units, and detached ADUs in Roseville, CA. We pull every City of Roseville building permit, publish our pricing before you sign anything, and identify Roseville Electric rebates that apply to your project. One crew takes your project from the first site visit to the City’s final inspection sign-off.
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  • City of Roseville ADU Building Permits
  • AB 2221 + SB 9 Compliant Builds
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Every ADU Service Roseville Renovations Provides

ADU Garage Conversion Roseville, CA

Roseville Renovations converts attached and detached garages into permitted ADU dwelling units. The scope includes: concrete slab moisture assessment, plumbing rough-in (drain, supply, and vent lines), electrical panel circuit additions, bathroom and kitchen wall framing, insulation to Title 24 Part 6 standard, drywall, tile, flooring, cabinetry, fixtures, and a separate exterior entry door. Every permit is pulled from the City of Roseville Development Services Division at 311 Vernon Street before construction begins.

Junior ADU (JADU) Conversion Roseville

Roseville Renovations builds Junior ADU (JADU) units inside existing attached garages for Roseville homeowners. The finished space tops out at 500 square feet. Roseville Renovations handles the deed restriction recording at the Placer County Recorder as part of the permit close-out. A Junior ADU (JADU) can share a bathroom with the primary home, which removes a full plumbing rough-in from the scope and reduces your construction cost.

Detached ADU Construction Roseville, CA

Roseville Renovations builds detached ADUs on your rear or side yard from the ground up. The scope includes: site survey, foundation form and pour, framing, roofing, and all utilities extended from the main home or the street. The full permit package covers building, grading, plumbing, and electrical. A finished detached ADU works as a separate rental unit, a guest house, or a permanent family residence.

ADU Electrical and Panel Upgrade Roseville

Roseville Renovations adds two to four new dedicated circuits for every ADU garage conversion: a kitchen appliance circuit, one or two GFCI receptacle circuits, and a dedicated HVAC circuit for the mini-split heat pump. If your existing home panel is at or near capacity, a panel upgrade is required before the ADU circuits can be added. Roseville Renovations checks panel load at the free estimate visit and lists the panel upgrade as a separate cost line if needed. Panel upgrades may qualify for a Roseville Electric rebate of up to $500.

ADU Kitchen and Bathroom Plumbing Rough-In Roseville

Roseville Renovations installs the full drain, waste, and vent system and all supply lines for every ADU kitchen and bathroom at the rough-in stage. A full ADU needs a complete kitchen and at minimum a three-quarter bathroom with toilet, sink, and shower. California Plumbing Code Section 710.1 governs DWV pipe sizing for all ADU fixtures. The City of Roseville building inspector reviews the rough-in before any wall is closed.

ADU Mini-Split Heat Pump Installation Roseville

Roseville Renovations installs ductless mini-split heat pumps on every ADU garage conversion in Roseville. A single-zone mini-split handles both heating and cooling without ductwork. This is the right solution for a garage that has no existing duct system. California Title 24 Part 6 also requires mechanical ventilation in habitable rooms that do not have enough operable windows. Roseville Renovations installs the indoor head unit, the outdoor compressor, the refrigerant lines, and the dedicated electrical circuit as a single scope item. The mini-split installation may qualify for a Roseville Electric rebate of up to $300.

Slab Foundation ADU Garage Conversion (Maidu and South Roseville)

Roseville Renovations includes concrete slab cutting in every ADU garage conversion estimate for Maidu (95661) and South Roseville. Garages in these neighborhoods sit on monolithic concrete slabs. Adding a bathroom requires cutting the slab to place the toilet drain rough-in and floor drain. Roseville Renovations uses a Husqvarna DM220 core drill and a diamond-blade concrete saw to make controlled cuts at the correct depth. After the City of Roseville plumbing inspection passes, we repour the slab to its original thickness and slope. The slab cut-and-recore scope is listed as a separate line in your estimate so the cost is clear before work begins.

ADU Insulation and Title 24 Part 6 Energy Compliance Roseville

Roseville Renovations installs all insulation to the 2022 California Energy Code standard before any drywall on every ADU garage conversion. California Title 24 Part 6 sets the minimum R-values: R-21 batt with a thermal break for ADU exterior walls and R-38 for ceilings. Meeting Title 24 Part 6 is a requirement for every City of Roseville building permit close-out. Roseville Renovations includes the Title 24 Part 6 compliance report in every permit package. The City of Roseville building inspector verifies insulation at the rough-in stage before the drywall crew arrives.

Complete City Approval Management

How Roseville Renovations Converts a Garage to an ADU

Roseville Renovations follows the same six steps on every ADU garage conversion. You know what happens and when from day one.

01

Free On-Site Feasibility Assessment

Roseville Renovations visits your property at no cost. We use a Tramex CME5 moisture meter to probe the concrete slab for moisture problems before any planning begins. We measure ceiling height and confirm it meets the California Building Code Section R305.1 minimum of 7 feet for habitable rooms. We also check your electrical panel capacity for the new ADU circuits.

02

Written Scope and ADU Type Selection

After the site visit, Roseville Renovations delivers a written scope document. It lists the ADU type, all permit types required, the project timeline, and a published cost range. You do not need to sign a contract to receive the scope. There is no obligation to proceed.

03

Permit Package Preparation

Roseville Renovations prepares your full permit package. This includes architectural drawings, structural engineering notes where needed, and a Title 24 Part 6 energy compliance report. We submit the package to the City of Roseville Development Services Division at 311 Vernon Street and track your application status.

04

Demolition and Plumbing and Electrical Rough-In

Construction starts after the permit is in hand. Roseville Renovations checks the concrete slab at demo for any drainage corrections needed before the space becomes habitable. Next, we run the plumbing drain, supply, and vent lines for the kitchen and bathroom. We also run the new electrical circuits for the ADU panel.

05

Insulation, Drywall, and Finish

California Title 24 Part 6 sets the minimum insulation R-values for ADU walls and ceilings. Roseville Renovations installs insulation to the 2022 California Energy Code standard before any drywall is installed. After the City of Roseville inspection passes, finish work begins: flooring, kitchen cabinetry, bathroom tile, fixtures, doors, and windows.

06

Final Inspection and Close-Out

Roseville Renovations schedules and attends the City of Roseville final building inspection. After the City signs off, you receive a complete permit close-out packet. This packet includes the City-stamped inspection card, all product warranties, and your waterproofing and insulation documentation.

Service Area

TOP-RATED LOCAL SERVICES ACROSS ROSEVILLE

We are proud to serve homeowners and businesses right here in Roseville. From historic Downtown to Westpark and Blue Oaks, being local allows us to deliver quick response times, navigate local Placer County permitting seamlessly, and provide top-tier service tailored specifically to your neighborhood.
  • Blue Oaks
  • Quail Glen
  • Sun City
  • Westpark
  • Woodcreek Oaks
  • Kaseberg-Kingswood
  • Stanford
  • Lead Hill
  • Olympus Pointe
  • Olympus Pointe
  • Sierra Gardens
  • Johnson Ranch

Start Your Roseville ADU Garage Conversion Today

Call 530-802-1015 or fill out the form below. Roseville Renovations schedules a free on-site assessment, confirms your ADU type eligibility, checks for City of Roseville pre-approved plan compatibility, and lists all Roseville Electric rebate-eligible upgrades in your written estimate. No obligation is required to receive the estimate.
Every ADU garage conversion Roseville Renovations completes is backed by a  workmanship warranty.
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Helpful Answers

ADU Garage Conversion in Roseville, CA: Common Questions

How much does an ADU garage conversion cost in Roseville, CA?
Roseville Renovations publishes cost ranges by project type. A Junior ADU (JADU) runs $45,000 to $75,000. A standard ADU garage conversion runs $95,000 to $145,000. A slab foundation conversion (Maidu and South Roseville) adds $10,000 to that range. A detached ADU new build runs $175,000 to $280,000. Call 530-802-1015 to schedule a free on-site assessment and get a written line-item estimate.
Yes. Every ADU garage conversion in Roseville requires a City of Roseville building permit. Most projects also need a plumbing permit and an electrical permit. Roseville Renovations submits all permits to the City of Roseville Development Services Division at 311 Vernon Street and tracks every application. The City of Roseville cannot deny a permit for a project that meets California AB 2221 minimum standards, even if a local zoning rule would otherwise block the build.
A Junior ADU (JADU) is a maximum 500-square-foot unit built inside an existing structure. It can share a bathroom with the main home. A deed restriction is recorded at the Placer County Recorder at permit close-out to confirm its JADU status. A standard ADU garage conversion is a fully independent unit up to 749 or 800 square feet (under AB 2221) with its own complete kitchen and its own bathroom. A Junior ADU (JADU) is faster to permit and less expensive to build.
On the City of Roseville pre-approved master plan track: four to six weeks. On the standard residential permit track: seven to fifteen business days after a complete submittal. For detached ADU builds that require a grading permit, add two to four more weeks. The full ADU garage conversion project, from site visit to City final inspection, typically runs five to eight months.
The City of Roseville Development Services Division keeps a library of pre-approved ADU architectural plans. Roseville Renovations uses these plans to cut the permit and design phase from three to five months down to four to six weeks. We check your eligibility at the free estimate visit. If your ADU garage conversion scope qualifies, you save both design fees and review time.
Yes. Roseville Electric is a city-owned utility with its own rebate catalog. A mini-split heat pump qualifies for up to $300. A Level 2 EV charger qualifies for up to $500. A 200-amp panel upgrade qualifies for up to $500. LED lighting qualifies for up to $75. A smart thermostat qualifies for up to $50. Confirm current rebate amounts at rosevilleelectric.com. Roseville Renovations documents all qualifying upgrades and provides the rebate submission paperwork at project close-out.
California AB 2221 took effect in January 2023. It allows an ADU up to 800 square feet on any single-family lot regardless of local lot coverage limits. The City of Roseville must issue an ADU building permit for any project that meets AB 2221 standards. If a local zoning rule creates a conflict, Roseville Renovations cites AB 2221 in the permit package and the state law governs.
Yes. Garages in Maidu (95661) and South Roseville sit on monolithic concrete slabs. Adding a bathroom requires cutting the slab to place the toilet drain rough-in and floor drain. Roseville Renovations uses a Husqvarna DM220 core drill for all slab cuts. After the City of Roseville plumbing inspection passes, we repour the slab to original thickness. The slab cut-and-recore scope adds $8,000 to $15,000 and is listed as a separate line in every Maidu and South Roseville estimate.
An attached ADU garage conversion triggers a structural review of the shared wall with the primary home. California Building Code Section R302.5 requires a one-hour fire-rated assembly at that wall. A detached garage conversion is treated as a separate structure, so no shared wall fire separation review is needed. Roseville Renovations prepares both permit packages. The attached garage package includes all required fire wall documentation.
A one-bedroom ADU in West Park (95747) or Stoneridge (95678) rents for about $1,400 to $1,900 per month at current Roseville market rates. A $120,000 ADU garage conversion generating $1,600 per month returns about 16% gross on the construction cost each year. Roseville Renovations does not provide investment advice. Talk to a licensed Roseville-area real estate advisor or property manager for projections on your specific property.
Yes. Roseville Renovations builds detached ADUs on vacant rear or side yard lots and converts interior rooms into Junior ADU (JADU) units without a garage. California AB 2221 allows ADUs up to 800 square feet on any single-family lot regardless of whether a garage exists. Roseville Renovations assesses the correct ADU type for your property at the free on-site visit.
No. California AB 2221 prohibits cities from requiring minimum lot sizes for ADU permits. The City of Roseville cannot deny an ADU building permit based on lot size alone if your project meets AB 2221 standards. Roseville Renovations confirms your specific lot eligibility at the free on-site assessment and cites state law in the permit package if a local conflict arises.
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