Golden State ADUs is a full-service design-build accessory dwelling unit (ADU) specialist serving Antelope homeowners from our Roseville office, five miles east of the Antelope planning area. We handle architectural design, structural and civil engineering, Sacramento County permitting and construction as one accountable team, so you hire one ADU builder instead of assembling three separate firms and hoping they talk to each other. We own the entire process, from the first site visit to the final signed inspection.
We build ADUs, and only ADUs. That focus is why we already know that Antelope is an unincorporated community in Sacramento County rather than an incorporated city with its own building department, and why your permit path is mapped before you ever sign anything.
We are licensed and bonded (LIS. #1125656), trusted by 100+ happy customers, and every ADU project we complete carries a 10-year structural integrity warranty and a 1-year fit-and-finish warranty.
One call, one team, one process, from the first backyard walkthrough to your final signed job card. Book A Consultation and we will tell you honestly what your Antelope lot can support.
Accessory Dwelling Unit Services We Provide in Antelope
We design, permit and build. That is the whole scope, and it stays with us from concept to completion.
Architectural design, structural engineering and civil engineering come from our in-house design and engineering arm, Golden State Design & Engineering. Your architectural plans and your engineering leave the same office, on the same schedule, which is why no Antelope homeowner working with us needs to find a separate architect, a separate engineer or a separate builder, and no one has to referee between them when a detail changes. See our full ADU services for the complete picture.
Detached ADUs for Antelope Backyards
The detached backyard ADU is the most common project type in Antelope, because roughly 85.3% of the community’s housing is detached single-family homes sitting on tract lots with usable rear yards. Sacramento County allows detached new-construction ADUs up to 1,200 square feet under its current zoning standards, and every new unit must sit on a permanent foundation.
What decides feasibility is buildable area, not how your yard looks today. A patio, a pool or a mature tree rarely ends the conversation. Setbacks, utility routing and lot coverage are what we measure, and detached ADUs give you genuine separation for long-term rental income, a home office or family living close by.
Custom ADUs and Floor Plan Design
Custom ADUs are how we solve the Antelope backyards that a fixed model cannot fit. Narrow side yards, existing pools, odd rear-yard geometry and utility runs all shape the design, and we would rather adjust the plan than force the lot.
Sacramento County’s ADU setback requirements for a new unit are four feet at the sides and rear, 20 feet at the front, and 12.5 feet at a corner side street, all subject to area-specific ordinances and available deviations. Those dimensions define the envelope. Inside it, the layout is yours: where the entry faces, how the kitchen and bath stack for plumbing efficiency, whether vaulted ceilings make a compact footprint feel larger, which windows catch light without staring into a neighbor’s yard. Custom floor plan work is simply how we make every square foot of usable space earn its place.
Garage Conversions and Attached ADUs That Add Living Space
Garage conversions and attached ADUs are both legitimate paths in Antelope, and for many tract homes they are the most practical one. When an existing permitted structure is converted to an ADU, it may retain its originally permitted setbacks, which can make a conversion viable where a new detached build would be tight against the four-foot side and rear setback standard. Turning unused space into livable space is often the shortest distance between where you are and a finished unit.
Converting covered parking to living space does not, on its own, trigger a replacement-parking requirement under current County standards. We verify how parking is treated on your specific parcel during feasibility, along with whether the existing slab, framing and roof can carry a habitable conversion.
ADU Models, ADU Plans and Sizes, Studio to 3 Bedroom
Our ADU options run from a compact studio to a three bedroom unit, so your size is chosen from analysis rather than guesswork:
- Studio ADUs for compact lots and single occupants
- One bedroom ADUs, the workhorse size for a rental unit or family use
- 2 bedroom and 3 bedroom ADUs where buildable area allows
- Tiny homes built to efficiency-focused footprints
- ADUs with garage, and a junior ADU carved out of the main house
Standard detached ADU height in Sacramento County is 16 feet, with defined routes for certain 18-foot and 20-foot designs. ADU size is tied to your buildable area and to the Antelope fee thresholds covered further down this page, because those two factors move a budget more than finish selections ever will.
Retirement and Multigenerational ADUs
If you are building for aging parents, the design brief is different, and we treat it that way. Single-level layouts, wider door openings, a curbless or low-threshold shower, level entry from the main house, and a private bathroom of their own.
Sacramento County requires a detached or attached ADU to have its own separate entrance and its own bathroom, which is exactly what makes this work for families: a separate living space that supports independent living, twenty steps from your back door. Whether you call it a retirement ADU or a parents ADU, the same design logic serves an adult child, a returning student, a live-in caregiver or any extended family members who need proximity without shared walls.
Interior Design Packages and Finish Selections
Our interior design bundles take the selection burden off you. Professionally curated furniture layouts, material selections and finishing details, assembled as a coordinated package rather than a hundred separate decisions made under deadline pressure.
Homeowners who choose this option get a finished ADU that reads as designed, not assembled. Homeowners who enjoy selecting their own finishes are welcome to, and we will keep the specification consistent either way.
Permitting and Compliance, Done for You
We prepare, submit and shepherd your Sacramento County permit package from first submittal through final approval, measured against the local codes that apply to your parcel. The Sacramento County Building Permits & Inspection Division is the building-permit authority for unincorporated Sacramento County, including Antelope, and the County accepts building plans electronically through its permit portal.
You do not stand in a line, decode a correction letter or chase a plan checker. Permits, paperwork, compliance, done for you.
Why Antelope Homeowners Choose Our Sacramento, CA Design-Build Team
Homeowners comparing Sacramento ADU builders usually land with us for one reason: accountability sits in a single place. Design, engineering, permitting and construction are all ours, which means there is no gap between the plan set and the build crew for a problem to fall into, and no third party to blame when a detail is missed.
Two things most Antelope ADU pages get wrong are worth stating plainly, because they affect your project directly.
First, Antelope is governed by Sacramento County, not by a city. Antelope is a census-designated community rather than an incorporated city with its own building department. Many homeowners lose weeks searching for a City of Antelope permit counter that does not exist. We submit to the County, through the County’s electronic portal, on the County’s standards, and we do it routinely.
Second, Antelope has its own development impact fee program. The Antelope Public Facilities Financing Plan Development Impact Fee Program funds major roads, parks, drainage and water-supply facilities in this specific community. It also exempts ADUs of 850 sq ft or less, and multi-bedroom ADUs of 1,000 sq ft or less, from its development impact fees. An ADU contractor who does not know that threshold can design you straight past it without ever mentioning the consequence.
Here is what else we bring to an Antelope project:
- In-house architectural, structural and civil engineering through Golden State Design & Engineering, so plan revisions happen in one office instead of across three, and the building process stays streamlined.
- Fair and transparent pricing. We break your estimate into design, engineering, permits, site work, utility work, construction and selections, and we apply value engineering where it protects quality. We do not quote a flat price before we have reviewed your site, because that number would not be honest.
- Licensed and bonded, LIS. #1125656.
- Trusted by 100+ happy customers, with 18 Google reviews on record.
- Quality craftsmanship as the standard, backed by a 10-year structural integrity warranty and a 1-year fit-and-finish warranty on all projects.
- Responsiveness as a standing commitment. We respond quickly to calls and emails and provide regular project updates without delays. Being left in the dark is the complaint we hear most about previous builds, and it is the one we designed our process to eliminate.
We are based in Roseville, not in Antelope, and we would rather say so than pretend otherwise. County planning describes the Antelope planning area as roughly five miles west of central Roseville, which is close enough that our team is on your street when it matters and far enough that we are not claiming a storefront we do not have. We serve Antelope, the surrounding Sacramento region and communities south toward Elk Grove with the same in-house team.
We have also been the second company on a project more than once, after a homeowner’s first attempt stalled. If that is where you are, the conversation is the same: what exists, what is permitted, and what it takes to finish properly. What you get either way is an ADU builder Sacramento County homeowners can hold accountable, because there is nobody else on the org chart to point at.
The fastest way to know whether this works for you is to find out whether your lot works. Book a free 30-minute consultation and we will review the parcel before you commit to anything.
How Building an ADU in Antelope Works: Our 5-Step ADU Process
The ADU process is linear, transparent and owned by one team from start to finish. Typical ranges are 3 to 5 months for design and permit plans, then 3 to 4 months for construction. Those are typical, not guaranteed, and your parcel and the County review cycle both influence the calendar.
Step 1: Free Consultation and Site Walkthrough
Every project starts with a simple inquiry and a one-hour project walkthrough at your Antelope property. We walk the yard, take site measurements, look at side access, find the panel, trace where sewer and water likely run, and review satellite and parcel imagery alongside what we see on the ground.
You leave that meeting with a free property analysis in plain language: your buildable area, an assessment of utility paths, and a straight answer on feasibility. If your lot will not support the ADU you want, we tell you at this stage. Just as importantly, plenty of yards that look too full turn out to work fine, so do not disqualify yourself based on appearance.
Step 2: Feasibility, Zoning Review and Budget Analysis
Before a line of design is drawn, we check the rules that govern your parcel: County zoning, setbacks, height, lot coverage, recorded easements, drainage and fee exposure. Portions of East Antelope fall under a Specific Plan that may impose more restrictive development regulations than the general County rules, so boundary confirmation happens here rather than after plan check. California law also limits development impact fees on the smallest ADUs, and Antelope layers its own program on top of that, which is why we look at both.
Then we build the budget. Sacramento County does not publish one flat ADU permit fee, because building charges are valuation-based and the other agency permit fees are project-specific, so we estimate by component: design, engineering, permits, site work, utility work, construction and selections. This is also where value engineering happens, while changes are still free.
Step 3: Architectural Design and Engineering
ADU design here is collaborative and iterative. We develop the floor plan with you, adjust it, and adjust it again until the layout does what your family actually needs, then our in-house team completes the structural and civil engineering on the same plan set. Tight lots and awkward utility runs are where innovative solutions earn their keep, and that work belongs on paper rather than in the field.
Nothing goes to the County until you have approved the design. That single rule prevents the most expensive category of surprise in ADU construction, which is discovering during the build that the plan was never quite what you pictured.
Step 4: Permit Submittal to Sacramento County
We submit your plans electronically through the Sacramento County permit portal and manage the file from there. The Building Permits & Inspection Division is the permitting authority for Antelope, and complete ADU permit submissions can touch building, planning, engineering, fire and utility reviewers.
Plan-check corrections are a normal part of the permit process. We answer them, resubmit and keep the cycle moving, and you get updates as they happen instead of having to call and ask where things stand.
Step 5: Construction, Inspections and Final Sign-Off
A dedicated project manager carries the construction process through the County inspection sequence to final sign-off. Sacramento County publishes inspection codes covering foundation and footings, underground trades, framing, rough electrical, plumbing and mechanical, insulation, drywall and the final inspections, and work must be inspected before it is covered.
The signed final residential job card serves as your project’s Certificate of Occupancy. At handover you receive the 10-year structural integrity warranty and the 1-year fit-and-finish warranty, plus post-project construction administration if questions come up later. Expert craftsmanship is what we are judged on long after the last inspection clears.
Local Regulations, Site Conditions and What an Antelope ADU Project Actually Involves
Antelope has specific conditions that shape an ADU project, and knowing them in advance is most of what separates a smooth build from a stalled one.
Jurisdiction and overlays. Antelope is unincorporated, so Sacramento County issues your permit and enforces zoning. On top of the general County standards, the East Antelope Specific Plan can impose more restrictive local regulations within its boundaries. Confirming whether your parcel sits inside that plan area is a first-week task for us, not a plan-check discovery.
The Antelope fee program, and why size strategy matters here. The Antelope Public Facilities Financing Plan Development Impact Fee Program funds roads, parks, drainage and water-supply facilities for this community. Its ordinance exempts ADUs of 850 square feet or less, and multi-bedroom ADUs of 1,000 square feet or less, from those development impact fees. That makes the decision between, say, a 1,000-square-foot two bedroom and a larger unit a budget decision as much as a lifestyle one. We run that analysis before design, not after, because it is one of the few genuinely Antelope-specific levers available to you.
The housing stock, and what it means for your build. Antelope’s median housing construction year is 1993, and County watershed planning describes the urban part of the community as largely constructed in the late 1980s and early 1990s. Detached single-family homes make up about 85.3% of the housing here. In practice, for an ADU builder working on a home of that vintage, feasibility includes:
- Electrical service and panel capacity. A second dwelling unit adds load. We assess whether your existing panel supports it or whether panel upgrades belong in the budget from day one.
- Sewer and water routing. Where the existing laterals serving your primary residence run determines how far new lines travel and how much trenching the site work requires.
- Permit history on what is already there. Patios, sheds, room additions and garage alterations from the 1990s are not always permitted. Finding that out during feasibility is far cheaper than finding out during inspection.
- Equipment access down the side yard. Tract lots from this era often have narrow side access with a fence, a gate and a gas meter in the way. Access shapes foundation method, material delivery and schedule, so we measure it on the walkthrough.
- Fire separation near property lines. A unit sited close to a lot line brings separation requirements into the design.
Where we work in Antelope. County planning documents identify Highland Hills, Antelope Estates, Antelope Parkside and D.O. Greens among Antelope’s residential areas, and the official Antelope Community Plan map names Antelope Road, Walerga Road, Watt Avenue, Don Julio Boulevard, Elverta Road, North Loop Boulevard, Palmerson Drive and Blackfoot Way as the community’s major reference streets. Whether your home is off Walerga Road, closer to Elverta Road, or in the blocks around Antelope Community Park at 8012 Palmerson Drive, the process is the same and the County standards are the same. What changes is the parcel and its site conditions.
Climate, terrain and drainage. Antelope sits in the Sacramento Valley’s pattern of hot, dry summers and cool, wetter winters. That drives real design decisions: HVAC sizing, insulation levels, window performance, shading on west-facing glass, and roofing and sealant selections that hold up under sustained sun. Dry months are favorable for excavation, foundation work, framing and exterior finishes. Winter storms make temporary weather protection, erosion control and site drainage part of responsible scheduling rather than an afterthought.
Antelope is extensively master-planned for drainage, with systems associated with Dry Creek, Sierra Creek, Basin A and related local watersheds. A new ADU adds roof and foundation area, which means added impervious surface, so we review how your parcel drains and confirm flood-hazard status and any drainage easements at the address itself. We do not make blanket claims about whether Antelope floods. That answer lives at the parcel level.
Rental use, stated honestly. Sacramento County generally prohibits newly permitted ADUs from being used for stays of 30 days or less. So plan your new Antelope ADU around long-term tenancy or family use. We will not sell you a short-stay rental story that the County rules do not support. Long-term units also do something broader: every well-built ADU adds a unit of affordable housing to a community that needs more of them.
How we serve Antelope from Roseville. Our office is in Roseville, roughly five miles east of the Antelope planning area per County planning documents. One coordinated team handles your design, engineering, County permitting and construction, and that team is close enough to be responsive to an Antelope job site.
Frequently Asked Questions
These are the questions Antelope homeowners ask us most. For a parcel-specific answer, a short call gets you further than any general article.
Do I need a permit to build an ADU in Antelope, and who issues it?
Yes, and it comes from Sacramento County, not from a City of Antelope department, because Antelope is an unincorporated, census-designated community. The Sacramento County Building Permits & Inspection Division is the building-permit authority for your address, and plans are submitted electronically through the County’s permit portal. We prepare and submit the full package, manage corrections and carry it through approval, so the permitting side never becomes your problem.
How big of an ADU can I build in my Antelope backyard?
Up to 1,200 square feet for a detached new build under Sacramento County’s current zoning standards. Standard setbacks are four feet on the sides and rear, 20 feet at the front and 12.5 feet on a corner side street, with a standard detached height of 16 feet and defined routes for certain 18-foot and 20-foot designs, all subject to area-specific ordinances and available deviations. Your actual maximum depends on the parcel, existing structures and whether the East Antelope Specific Plan applies, which can be more restrictive. Confirm with the County planning department or let us review the parcel during a consultation.
What does an ADU cost in Antelope, and what is the most cost-effective way to build one?
ADU cost in Antelope is parcel-specific and estimated after site and design review, never quoted flat, because size, site access, utility connections, engineering, materials and finishes all move the number. Sacramento County does not publish one flat ADU permit fee either: building charges are valuation-based and other agency fees are project-specific. The strongest budget lever available here is size strategy, since the Antelope Public Facilities Financing Plan exempts ADUs of 850 square feet or less, and multi-bedroom ADUs of 1,000 square feet or less, from its development impact fees. Beyond that, value engineering, garage conversions and straightforward site access are where real savings live.
What is the $40,000 grant in California for ADUs?
It refers to a state-administered ADU grant program that many homeowners have heard about, designed to help offset pre-development costs such as design, permits and site work. Program funding and eligibility rules have changed over time, and availability is not continuous. Check the current status of the state program directly before counting on it, and build your budget as though it is not available. If it is open when your project starts, treat it as a bonus rather than a foundation.
How long does an ADU take from design to move-in?
Typically 3 to 5 months for design and permit plans, then 3 to 4 months for construction, framed as typical rather than guaranteed. Sacramento County provides project-specific review estimates rather than one universal ADU turnaround, so plan-check timing varies by project and cycle. We manage corrections quickly to keep momentum, and construction runs through the County’s inspection sequence from foundation and footings to framing, rough trades, insulation and drywall. The signed final residential job card serves as your Certificate of Occupancy.
Do you build in my part of Antelope, and can I rent the ADU out?
Yes, we serve Antelope throughout the community, from the Walerga Road and Watt Avenue side to the Antelope Road and Don Julio Boulevard areas and out toward Elverta Road, working from our Roseville office. We also build high quality ADUs across the surrounding unincorporated Sacramento County communities with the same in-house design, engineering, permitting and construction team. On rental use: plan for long-term tenancy or family occupancy, since Sacramento County generally prohibits newly permitted ADUs from being used for stays of 30 days or less. We do not project rents or returns, and any ADU builder who does is guessing.
Ready to See What Your Antelope Property Can Do?
One conversation tells you whether your lot works. Your free one-hour project walkthrough gives you a parcel and zoning read, an honest buildable-area concept, a look at utility routing and side access, and a clear budget conversation before you commit to anything at all.
Some owners want extra space for family. Others are thinking about long-term rental income, passive income and property value over the next decade. Either way, the new space starts with the same first meeting.
You will also get a straight answer, including the one nobody wants to hear, if your property will not support the ADU you have in mind. We would rather tell you that on day one than six months in.
Call us at (916) 909-2387, email office@gsadus.com, or stop by the office at 1001 Enterprise Way #100 in Roseville, about five miles east of Antelope.
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