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
If you’re looking at a home addition or ADU on a lot in Antelope, you’re dealing with Sacramento County permitting, not a city hall. That single fact changes the timeline, the paperwork, and the price. We’ve built additions and detached units on Antelope acreage for years, and we know the county’s septic and well setback rules well enough that our permits don’t stall at plan check. If you’re still in the early stages of figuring out what’s possible on your property, call us at (877) 610-1318 and we’ll talk you through it.
Antelope sits at the crossroads. You can be on Antelope Road with a tract home from the 1990s, or you can be north of it on 2 acres with a well and a drain field and a barn that predates the subdivision. The scope and cost of a home addition or ADU depend entirely on which Antelope you live in. We know the difference because we’ve built in both.
Why Barrett & Sons Construction Is Antelope’s Preferred Home Additions & ADU Company
We’re the company that puts every scope, every allowance, and every price change in writing before work happens. For Antelope homeowners who have been burned by a contractor quoting low on the phone and delivering a different number at the door, that’s the whole ballgame. If the allowance isn’t on paper, it’s a surprise waiting for a date. Tom Barrett founded this company in 1998, and his sons run the crews. When you call, a live person answers. When you have a question at rough-in, you’re not calling a dispatch desk in another state.
We also understand how Sacramento County inspections actually work. The permit inspector works for you, not for us. That’s why we schedule our Antelope jobs around county inspection sign-off timelines, not around what’s convenient for us. We’ve run projects near Watt Avenue and off Elverta Road, and we know which county reviewers ask which questions. The 90-Day Done Right Promise is written on every contract. If something’s not right, Tom comes back.
Our Home Additions & ADU Services in Antelope
Most Antelope additions fall into a few categories, and each one carries a different county permit path. Here’s how we handle the four most common requests, including the Home Additions & ADU work we do throughout Sacramento County. We also serve all of the broader Antelope area, from Antelope Road north to the acreage parcels.
New Detached ADU
A new detached ADU on Antelope acreage is a different animal from a backyard unit in an incorporated city. County rules control the distance from the septic tank, the leach field, and any well on the property. We scope these setback distances before we quote because they determine where a slab can physically sit. A 100-foot well setback can push your ADU footprint 20 feet in a direction you didn’t expect, and that changes the price. We file with Sacramento County from day one, using the correct forms the first time.
Garage Conversion ADU
Converting an attached or detached garage in Antelope triggers the same county permit process, plus structural review. Many 1990s Antelope garages were built without shear wall upgrades that today’s ADU code requires. The county will flag this at plan check. We identify the structural work before we quote, so you aren’t hit with a $6,000 change order midway through. A garage conversion in Antelope typically runs $30,000 to $80,000 depending on foundation condition, utility runs, and whether the garage has its own electrical panel.
ADU Site Prep & Utilities
On Antelope acreage, site prep is often the largest hidden cost. You’re dealing with expansive Sacramento clay that swells with winter rain and shrinks in 105°F summer heat. That movement cracks slabs. We test soil before we pour. Utility work also means trenching for power from the main house, running water lines, and tying into a septic system that may be 30 years old. The septic system may not be sized for the added bedroom count, and the county won’t sign off until it is.
Junior ADU & Interior Conversion
A Junior ADU or interior conversion is the fast path for Antelope homeowners who want rental income or space for family without a foundation pour. These projects stay within the existing footprint, which keeps septic and well requirements simpler. But county code still applies, and you still need a permit. We pull it, we rough-in to county spec, and we call the inspection. No surprises, because everything is in the change order before it happens.
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 don’t install mystery materials off the back of a van. For windows and glass in Antelope room additions and sunrooms, we use Simonton, Ply Gem, and in some cases PGT for impact-rated openings. These are brands you can look up, with published specs and warranties our Antelope customers can verify. Because our Sacramento yard stocks these lines, we can often turn around material orders for an Antelope addition faster than a contractor ordering piecemeal from a big-box store. When your addition hits the inspection date, the glass is on site.
Common Home Additions & ADU Problems We See in Antelope Homes
Antelope’s housing stock was built fast in the late 1980s and 1990s, and the same problems ripple through entire subdivisions at once. Here’s what we’re called in to fix most often.
- Wrong permitting path. Homeowners and even some contractors file Antelope addition or ADU paperwork with the City of Sacramento, then lose 10 to 14 days when it bounces. Antelope is unincorporated. Every approval, from plan check to inspection sign-off, runs through Sacramento County’s permit center. We file county forms on day one.
- Untested expansive clay under a new slab. A contractor pours a slab without soil testing, the first winter rain swells the clay, and the new foundation cracks. We’ve seen $15,000 re-pours. We test before we dig.
- Room addition placed over an old septic drain field. If the setbacks weren’t verified before framing, the county stops work at rough-in inspection. Moving a septic line can add $8,000 and three weeks. We survey before we design.
- No grading and drainage plan for an open-lot addition. On acreage, run-off that used to sheet across a field now hits the new slab or the neighbor’s pasture. Sacramento County wants a drainage plan before it issues a building permit. We include the grading plan in our drawings, not as an afterthought.
Pricing for Home Additions & ADU in Antelope, CA
The cost of an addition or ADU on Antelope acreage isn’t one number. It’s a stack of line items, and the ones that surprise people are the county-driven ones: soil testing, septic verification, well setback surveys, and drainage swales. Here are the ranges we see across Antelope’s 95843 ZIP code.
| Project | Typical Range in Antelope, CA |
|---|---|
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
| Home Addition | $45,000 - $130,000 |
What moves the number within those ranges: soil conditions, septic capacity, well location, utility trenching distance, and whether the county’s plan check requires a structural engineer’s stamp. On acreage with existing outbuildings, we also scope equipment access. If a concrete pump truck can’t reach the slab, the pour costs more. We write all of this out before we quote. Call (877) 610-1318 for a free estimate on your Antelope project.
We Also Serve Cities Near Antelope
Our crews work Antelope every week, and we serve the surrounding communities too: Home Additions & ADU in Antelope, Foothill Farms, North Highlands, Citrus Heights, and Elverta. If you’re one town over and wondering whether we’ll come out, the answer is yes. We coordinate scheduling from our Sacramento office, and our crews are familiar with the county roads and access routes throughout this part of Sacramento County.
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
Antelope ADU permits go through Sacramento County’s permit center, while Citrus Heights has its own city building department. The county process typically adds 1 to 2 weeks at plan check because you’re in a larger queue and some reviewers require additional sign-offs, like environmental health for septic. Homeowners who file city forms in error lose even more time. We file county forms from the start, which keeps your Antelope ADU permit moving instead of bouncing. Call (877) 610-1318 and we’ll walk you through the timeline for your specific parcel.
Sacramento County typically enforces a 100-foot setback between a well and any septic system or leach field, and the ADU slab must sit clear of both. On a 2-acre Antelope lot, this often dictates where the unit can go before you even think about floor plans. An existing septic system must also be sized for the additional bedroom count. We verify all setbacks with the county’s environmental health division before we file the permit, so your ADU doesn’t get built in a spot the county will later reject. For a site-specific answer, call us for a free evaluation.
You can, but the county will almost certainly require a structural upgrade. Garages built in 1990s Antelope subdivisions typically lack the shear wall framing current code requires for a converted dwelling unit. Plan check will flag it, and the fix generally adds $4,000 to $8,000 depending on how much of the garage wall must be opened and reframed. We identify this in our quote so you decide before you commit, not after the permit comes back. Call (877) 610-1318 and we’ll take a look at your garage.
Because Antelope’s lot stock includes open acreage and the county doesn’t want your new slab sending run-off onto a neighbor’s property or into a leach field. Expansive clay already complicates drainage, and a new impermeable roof area makes it worse. Sacramento County won’t issue a building permit for most additions without a grading and drainage plan stamped by a civil engineer. We include that plan in our drawings up front, which is one reason our Antelope permits don’t stall at the final review step.
Most of our material for Antelope additions comes from our Sacramento yard, which is a roughly 20 to 30 minute haul up Antelope Road or Watt Avenue depending on the exact parcel. On large structural packages, we coordinate delivery in a few scheduled drops so materials stage on site before framing starts rather than arriving late and stalling the crew. The haul distance doesn’t inflate your quote materially, but equipment access on narrow acreage driveways can. We scope all of that before we give you a number.
Get a Straight Answer on Your Antelope Addition or ADU
If you live in Antelope and you’re weighing a home addition, a garage conversion, or a detached ADU, call us before you sign anything. We’ll give you a written, line-item estimate that includes the county permit work, septic and well setbacks, soil testing, and drainage planning. No vague allowances, no change orders that appear out of nowhere. The allowance that isn’t on paper is a surprise waiting for a date. Call (877) 610-1318 and ask for the Antelope estimate. A live person answers.
Written by Tom Barrett, Owner at Barrett & Sons Construction. Ask anyone on your street, or look up the license number yourself.