Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Antelope
Home additions and ADUs in Antelope typically run $45,000 to $130,000 for a room addition, and $90,000 to $220,000 for a fully permitted detached ADU. The single biggest variable here isn’t lumber or labor. It’s Sacramento County permitting, well and septic setbacks, and Antelope’s expansive clay soil, which together determine what you can build, where it can sit, and what the foundation will cost before a single wall goes up. Barrett & Sons Construction has been building in this ZIP code long enough to know exactly how those three things change a bid. If you’re thinking about adding square footage or a rental unit on your Antelope property, call (877) 610-1318 and we’ll walk the lot with you before anyone talks price.
Why Barrett & Sons Construction Is Antelope’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998 and his sons run the crews. When we say we know Antelope, we mean we’ve framed additions off Walerga Road, re-graded pads near Antelope Road, and sat in the Sacramento County permit center on Branch Center Drive more times than we can count. We’re not a franchise dispatching strangers to your door. The person who walks your property is the same family that signs the contract and stands behind the 90-Day Done Right Promise written on it.
Antelope homeowners call us because we answer the phone with a live person, every time, 24 hours a day. No voicemail box, no out-of-state call center. We pull every permit through Sacramento County, because we know the unincorporated workflow catches contractors who usually build in incorporated cities like Citrus Heights and assume city hall rules apply. They don’t here, and that assumption has stalled more than a few Antelope projects before the first inspection. Our bid will reflect the real permitting path, so the schedule we quote is the schedule you get.
Our Home Additions & ADU Services in Antelope
ADU Design & Permitting
Detached and attached ADUs in Antelope go through Sacramento County’s permit center, not a city building department. That means a different submittal checklist, different setback requirements, and longer initial review times than you’d face in Roseville or Citrus Heights. We handle the full design and permitting package, including site plans that show well and septic clearances, because a missing clearance note is the most common reason Antelope ADU permits stall for weeks. We scope it right the first time so the County reviewer has nothing to kick back.
New Detached ADU
A new detached ADU on an Antelope lot is the most involved build we do here, and it’s also the one where County rules bite hardest. On half-acre and larger parcels, your structure must keep its distance from existing wells and leach fields, which can push the building envelope to a different corner of the lot than you’d initially pick. We design around those setbacks from day one. On a recent 750-square-foot ADU off Walerga Road, our crew kept the foundation 100 feet from the existing well and 10 feet from the leach field, re-graded the pad, and ran a new 125-foot sewer lateral to the main line. The permit sign-off came from a Sacramento County inspector, not a city one. That’s how Antelope works.
Garage Conversion ADU
Converting an existing attached or detached garage in Antelope usually costs less than new construction because the shell already exists. But the septic question still applies, especially for detached garages on larger lots. If your conversion adds a bathroom or kitchenette, the County wants to know the waste line path and whether the existing septic system can handle the added load. We check that before we quote, so the number we give you holds. Garage conversion ADUs in Antelope typically run $30,000 to $80,000, depending on whether you’re adding plumbing, trenching new lines, or just framing interior walls.
Junior ADU & Interior Conversion
A junior ADU, usually a converted bedroom or bonus room with its own entrance and small kitchenette, is the fastest permit path in Antelope because it doesn’t add a new building footprint. But even here, the County wants to see a clear path to egress and a plan for how the new kitchenette ties into existing plumbing. For Antelope homeowners who want rental income without a full ground-up build, a JADU is often the smartest first move. We’ll tell you honestly if your floor plan works for it, because not every 1980s tract layout does.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Antelope
We install materials you can look up, not mystery brands off a van. On Antelope ADU and addition jobs, that means Simonton windows on new sunrooms, Ply Gem vinyl for low-maintenance siding on detached units, and PGT impact-rated windows where the afternoon sun off Antelope’s hardpan lots beats down on west-facing walls. We stock common replacement parts locally so Antelope customers aren’t waiting on a freight truck from out of state when a window sash or door sweep fails mid-project.
Common Home Additions & ADU Problems We See in Antelope Homes
- Contractor assumes city permits apply. They don’t. Antelope is unincorporated Sacramento County, and the submittal checklist is different. A contractor who misses this stalls your project for weeks before the first inspection ever happens.
- Addition sited without checking well and septic setbacks. On Antelope acreage, your new structure must stay 100 feet from certain wells and 10 feet from leach fields. If the design doesn’t show that on paper, the County kicks it back and you’re paying for a redesign after rough-in is already done.
- Expansive clay ignored before the slab pour. Antelope sits on Sacramento Valley clay that swells with winter rains and shrinks in 105°F summer heat. A slab poured without proper soil prep will crack, and the cracks will walk right up into the new stucco within two wet winters.
- Original 1980s and 1990s tract framing surprises. Most Antelope homes are stucco-over-wood-frame builds from the same era, with nearly identical framing, roof pitches, and materials. When you tie an addition into one, we find what the last remodeler covered up. We scope for that before we quote.
Pricing for Home Additions & ADU in Antelope, CA
Here’s the straight answer for Antelope’s market. A room addition runs $45,000 to $130,000. A garage conversion runs $30,000 to $80,000. A fully permitted detached ADU runs $90,000 to $220,000. The spread inside each range comes from square footage, site work, utility runs, and what the County requires on your specific lot. Antelope’s clay soil means we often add soil prep and deeper footings. Septic and well setbacks can force longer trenching runs. Those aren’t change orders hiding in the weeds. They’re line items we put in the written scope before you sign anything, so the price you see is the price you pay.
| Project Type | Antelope Price Range |
|---|---|
| ADU Construction | $90,000 - $220,000 |
| Home Addition | $45,000 - $130,000 |
| Garage Conversion | $30,000 - $80,000 |
Every Antelope addition or ADU quote we write includes permits pulled through Sacramento County, inspections signed, and the 90-Day Done Right Promise. Call (877) 610-1318 for a free estimate. We’ll meet you on your lot, not on a screen.
We Also Serve Cities Near Antelope
Our crews serve Antelope and the surrounding communities, including Foothill Farms, North Highlands, Citrus Heights, and Elverta. If you’re on the border or just down the road, you get the same County-aware permitting knowledge and the same Home Additions & ADU team that works on Home Additions & ADU in Antelope every week.
Serving Antelope, CA - Our Local Coverage Area
We’re based in the Antelope 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 - Home Additions & ADU in Antelope
Sacramento County requires detached ADUs and additions to maintain specific distances from existing wells and septic leach fields, typically 100 feet from certain wells and 10 feet from leach field lines. On Antelope half-acre and larger lots, this can move your building envelope to a different corner of the property than you’d first choose. We pull your lot’s County records before we sketch anything, so the site plan we submit to the permit center shows the right clearances from the start. Call (877) 610-1318 and we’ll pull those records for you, no charge.
Antelope is unincorporated Sacramento County, so every construction permit goes through the County’s permit center rather than a city building department. The County has its own submittal checklist, its own review queue, and its own inspectors. Citrus Heights, Roseville, and other incorporated cities run their own faster municipal desks. A contractor who doesn’t know Antelope’s workflow will quote you a city-style timeline and then blame the County when it slips. We quote the County timeline from day one. Call (877) 610-1318 for a realistic schedule on your specific project.
Antelope’s expansive clay swells in winter and shrinks in summer, which moves slabs a measurable amount every year. Before we pour a detached ADU slab, we test the soil, over-excavate the pad, and often add compacted fill and deeper footings so the new structure doesn’t move independently from the ground under it. Skipping this step is how you get cracks in the new stucco within two wet winters. The soil work typically adds $3,000 to $8,000 depending on what the tests show, and we write that line item into your scope before any dirt moves. Call (877) 610-1318 to schedule a site walk.
It depends on what the conversion adds. If your garage ADU includes a bathroom or kitchenette, Sacramento County wants to see the waste line path and confirm the existing septic system can handle the additional load. On Antelope lots where the garage sits far from the leach field, you may need a new line run or a system upgrade. We check that before we quote, because it changes the price by thousands. A garage conversion ADU in Antelope runs $30,000 to $80,000 depending on plumbing scope. Call (877) 610-1318 for an exact number on yours.
Scope of work is the written document that lists exactly what we’ll build, what materials we’ll use, what permits we’ll pull, and what the price covers. It matters more in Antelope because County-required items like well setbacks, septic clearance, and clay soil prep are often left off a cheap bid, only to reappear as surprise charges after the project starts. We put every one of those in writing before you sign, and any change after that comes as a written change order with a price you approve first. The permit inspector works for you, not for us, and the scope is what keeps everyone honest. Call (877) 610-1318 for a written scope and a free estimate.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Antelope and Sacramento County since 1998.