Home Additions & ADU in Foothill Farms - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Foothill Farms

Adding square footage to a 1950s or 1960s ranch home in Foothill Farms usually costs between $45,000 and $130,000 for a room addition, while a new detached ADU runs $90,000 to $220,000 depending on site prep and finish level. Those are the numbers we quote most often out here, where every project routes through Sacramento County permitting, not any city hall. We’re Barrett & Sons Construction, and we’ve been building additions in Foothill Farms long enough to know that the county’s plan-check queue moves slower than Citrus Heights or Rancho Cordova, so early permit submission matters more than almost anything else. Call (877) 610-1318 and Tom or one of his sons will talk you through what’s realistic for your lot on Paseo Grande Drive, Roseville Road, or any street in the 95842 zip.

Call (877) 610-1318

Why Barrett & Sons Construction Is Foothill Farms’s Preferred Home Additions & ADU Company

Tom Barrett founded this company in 1998 and he still answers his own phone. His sons run the crews. When we say we know Foothill Farms, we mean we know how the county inspector views a 1960s stucco-over-frame addition, which plan-check reviewer handles ADU site plans, and what the Title 24 energy upgrade requirements will do to your budget before the first wall goes up. Homeowners off Andrea Boulevard and Elkhorn Boulevard tell us the same thing: national outfits quoted one number over the phone, then handed them a change order that doubled it. We put every allowance and every scope change in writing before work proceeds. Tom publishes his name, address, and license number. Look it up. Ask anyone on your street. That accountability is why people in Foothill Farms call us back for their second and third projects.

The 90-Day Done Right Promise sits on every contract, not buried in fine print. If something isn’t right, one call brings Tom back. Every eligible job includes permits pulled and inspections signed, because the permit inspector works for you, not for us. We carry $40 off any repair over $200, a free second opinion on any written estimate, no trip charge inside Sacramento County, and a permanent 10% senior and veteran discount. A live person answers the phone 24 hours a day, seven days a week. No voicemail box. No out-of-state call center.

Our Home Additions & ADU Services in Foothill Farms

ADU Design & Permitting

Detached ADUs in Foothill Farms fall under Sacramento County’s adopted state ADU standards, which allow up to 1,200 square feet on lots zoned for single-family homes. We handle the full design set your county plan checker expects: floor plan, structural calcs, site plan showing setbacks from the existing ranch house and from Roseville Road or Hillsdale Boulevard property lines, and a utility plan tied to your existing panel. Most 1950s Foothill Farms homes have 100-amp panels, so expect a panel upgrade requirement before the county signs off. We pull permits, schedule inspections, and stand with you through final approval.

Garage Conversion ADU

Converting an attached garage on a Foothill Farms slab foundation typically runs $30,000 to $80,000. The good news: your slab, roof, and framing already exist. The county’s challenge: garage conversions must meet current energy code, which usually means adding insulation to walls that never had any, installing Windows & Doors in Foothill Farms where a roll-up door used to be, and running a new sub-panel. We’ve converted garages on Woodman Way and around the 95842 area where the original 1960s wiring barely served the washer and dryer. We plan for that from the start, so you don’t get surprised at inspection time.

New Detached ADU

Building a new detached ADU in a Foothill Farms backyard costs $90,000 to $220,000. The spread is real: a 500-square-foot one-bedroom with a kitchenette runs the lower end; a two-bedroom with full kitchen, laundry, and upgraded finishes hits the top. Sacramento County requires fire separation when the ADU sits close to the property line or the main house, and the Sacramento Valley summer heat means we size your HVAC and insulation for 105-degree Julys, not just code minimums. Proper site grading matters too, because the county inspector checks drainage on any new foundation, and wet winters here expose poor slope work in the first season.

Junior ADU & Interior Conversion

A junior ADU, often a converted master-suite wing or enclosed sunroom, lets you add a rental unit or multigenerational living space without new foundation work. In Foothill Farms, where most homes sit on concrete slabs, interior conversions avoid the costliest part of ground-up construction. County code still requires a separate entrance, a kitchenette that meets efficiency standards, and reasonable privacy separation from the main house. This is our Home Additions & ADU team’s most practical option for homeowners who want rental income without a full backyard build. We also handle Kitchen Remodeling in Foothill Farms when the ADU plan includes a full kitchen, and Bathroom Remodeling in Foothill Farms for the ensuite.

Room Additions, Second Stories, and Sunrooms

Single-story ranch homes dominate Foothill Farms, which makes horizontal room additions the most common route. A family room bump-out or primary bedroom addition on a slab runs $45,000 to $130,000. Second-story additions are possible but less common, because many 1960s slab foundations in the area weren’t engineered for a full second floor, meaning you’ll likely need significant structural work. Sunrooms and enclosed patios offer a lighter-touch alternative for Sacramento’s mild winters and long summers, though the county still requires plans and inspections once the space is conditioned.

Trusted Brands We Use on Foothill Farms Projects

We install materials you can look up by name, not mystery brands off a van. On outdoor living and site work tied to additions and ADUs, we often use Techo-Bloc and Cambridge Pavers for patio substrates, walkways, and driveway transitions. For concrete footings, retaining walls, and utility trench backfill around the 95842 area, we spec Quikrete products and Oldcastle concrete block. When you’re placing a new ADU foundation on a Foothill Farms lot with the valley’s shrink-swell clay soils, what goes under the slab matters as much as what goes on top. We keep turnaround tight by sourcing these materials from Sacramento County suppliers we’ve worked with for decades, so a supply hiccup doesn’t idle your job for three weeks.

Common Home Additions & ADU Problems We See in Foothill Farms Homes

• Undersized 100-amp electrical panels. Nearly every 1950s and 1960s ranch we touch needs a panel upgrade before an addition or ADU passes county inspection. California’s current building code won’t let you add a mini-split, kitchenette, and laundry circuit to a panel already maxed out by the original house.
• Slab foundations with no perimeter drainage. Foothill Farms sits on flat, often clay-heavy ground. When you extend off a slab, Sacramento County requires grading and drainage plans, and a wet winter will expose any corner cut within a year.
• Original single-pane windows and thin attic insulation. Title 24 energy compliance applies to the existing home when you pull an addition permit. Many Foothill Farms owners don’t realize their new master suite means upgrading windows in the original house too.
• Plan-check backlogs at Sacramento County. Because Foothill Farms is unincorporated, everything routes through the county building department on Goethe Road, not a city counter. The wait runs noticeably longer than Citrus Heights or Rancho Cordova, which is why we submit early and follow up personally every week until your permit is ready.

Pricing for Home Additions & ADU in Foothill Farms, CA

We Also Serve Cities Near Foothill Farms

While this page focuses on Home Additions & ADU in Foothill Farms, our crews serve homeowners throughout northern Sacramento County. We regularly build in North Highlands, Antelope, Citrus Heights, and Carmichael, working with each jurisdiction’s permit office the same way we do with the county here: early submission, written change orders, and a face you’ll recognize on site. If you’re just outside the 95842 zip, call and ask. The free estimate covers you too.

FAQs - Home Additions & ADU in Foothill Farms