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 Sacramento
Adding an ADU or a room addition in Sacramento typically runs $45,000 to $130,000, and the local permit path is not a quick one when your property sits in a flood zone or on the area’s shifting Adobe clay. We are Barrett & Sons Construction, and we have pulled permits for additions and ADUs across Sacramento’s ranch-house neighborhoods, its river-adjacent corridors, and its older Craftsman blocks. We also offer Sacramento Roofing as part of our full construction services. Call (877) 610-1318 and Tom or one of his sons will walk your property, check your FEMA map panel, and give you a written scope before you spend a dollar.
Why Barrett & Sons Construction Is Sacramento’s Preferred Home Additions & ADU Company
We are not a franchise dispatching strangers from another county. Tom Barrett founded Barrett & Sons in 1998, and his sons run the crews that build additions and ADUs in Sacramento. When a homeowner in Land Park or Arden-Arcade calls, the person who answers is someone whose name is on the truck. We publish our license number, our address, and our phone number because the last contractor most Sacramento customers used told them permits were optional. They are not optional here, especially with the floodplain review process that touches so much of this city.
Sacramento homeowners tell us the same thing after working with a national outfit: the phone quote was one price, and the bill at the door was another. That does not happen with us. Every allowance, every scope change, every material upgrade arrives as a written change order before work proceeds. The permit inspector works for you, not for me. That is why we like him. And any Sacramento job we complete is backed by the 90-Day Done Right Promise written on the contract.
Our Home Additions & ADU Services in Sacramento
ADU Design & Permitting
An ADU in Sacramento is not a shed with a bathroom. If your parcel is in the lower-lying neighborhoods near the Sacramento or American River corridors, pulling a permit triggers a FEMA flood-zone review that can reshape your entire foundation design. Finished floor elevations may need to sit several feet above grade, and flood vents or wet-floodproofing specifications can land in your permit conditions. We handle that coordination with Sacramento’s floodplain management office directly. Your plans come back stamped, your elevation certificate gets ordered, and nothing gets framed until the permit is in hand.
Garage Conversion ADU
Most Sacramento garages from the 1950s and 1960s were never engineered for living space. The slab is thin, the framing is undersized, and the original electrical panel in the house often cannot carry a converted unit. We see this on nearly every garage conversion in neighborhoods like Fruitridge Pocket and the south Sacramento ranch tracts. A typical garage conversion ADU in Sacramento runs $30,000 to $80,000, and the number moves depending on whether we are cutting in a new foundation perimeter, upgrading the panel, or adding flood vents.
New Detached ADU
Building a detached ADU in Sacramento on Adobe clay soil is a different animal than building one on the stable loam you find closer to the coast. Our summers bake the ground into a cracked, shrunken mass, and winter rains swell it right back. That is why we spec deeper footings and often recommend a raised stem wall instead of a slab-on-grade when the soils report comes back aggressive. A new detached ADU in Sacramento typically runs $90,000 to $220,000, and the soils report and flood-zone review are where the real design work gets done, not in a catalog.
Junior ADU & Interior Conversion
A Junior ADU inside an existing Sacramento home is the fastest path to rental income or multi-generation living, because it uses existing square footage instead of new foundation work. We convert attached garages, finished basements where they exist, and large bonus rooms into self-contained JADUs with their own efficiency kitchens and separate entrances. In Midtown and East Sacramento, where lots are tight and a detached structure is not feasible, a JADU is often the only legal path to an income unit. We handle the efficiency kitchen, the egress, and the separate meter where the City requires it.
Adjacent work often overlaps. If we are opening walls for an addition, Kitchen Remodeling in Sacramento often follows. If a converted space needs a second full bath, Bathroom Remodeling in Sacramento falls under the same permit set. And our Home Additions & ADU team handles it all under one roof.
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 Sacramento
We carry materials you can look up, not mystery brands off a van. On hardscape and patio work tied to additions, we install Belgard pavers through our Sacramento Belgard service and Techo-Bloc products. For foundations and site prep, we spec Quikrete and Oldcastle products that handle Sacramento’s shrink-swell clay conditions. When a Sacramento customer calls about a retaining wall or a paver courtyard that is part of an ADU site plan, the answer is not “whatever the supplier has.” It is a named product with a published spec sheet, priced in writing before it touches the job.
Common Home Additions & ADU Problems We See in Sacramento Homes
- FEMA flood-zone surprises. Parcels near the Sacramento and American Rivers routinely require elevation certificates and flood-vent specifications. We check the map panel before you buy plans, not after the foundation is dug.
- Adobe clay shrink-swell damage. Sacramento’s rainless summers dry the soil until it cracks and pulls away from slabs. Winter rains swell it back. Additions and ADUs need footing depths and stem-wall designs that account for this, which is not standard practice in every bid you will see.
- Undersized electrical panels in 1950s-1970s ranches. Most post-WWII Sacramento homes were built with 60-amp or 100-amp panels. An ADU with a kitchen, laundry, and heating can exceed that before we hang the first sheet of drywall.
- Asbestos in original flooring and pipe insulation. The dominant housing stock in south and east Sacramento is 1950s-1970s ranch construction. Many of those homes have asbestos-containing vinyl tile or pipe wrap that must be tested and abated before demolition begins. We do not skip that step, and we do not hide the cost.
Pricing for Home Additions & ADU in Sacramento, CA
A room addition in Sacramento typically runs $45,000 to $130,000. A garage conversion ADU runs $30,000 to $80,000. A new detached ADU runs $90,000 to $220,000. The biggest cost movers in Sacramento are the soils report, the flood-zone review, and the age of your existing electrical service. A written quote from us is a line-item scope with named brands and a fixed price. No change order happens without your signature. Call (877) 610-1318 for a free estimate, and ask for Tom. He answers his own phone.
| Project Type | Typical Sacramento Range |
|---|---|
| Room Addition | $45,000 - $130,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
| New Detached ADU | $90,000 - $220,000 |
| Junior ADU / Interior Conversion | $25,000 - $75,000 |
Ranges reflect typical Sacramento market conditions including flood-zone reviews, Adobe clay soil engineering, and 1950s-1970s housing stock realities. Your written quote will be specific to your parcel.
We Also Serve Cities Near Sacramento
Our crews work across the Sacramento metro, including Home Additions & ADU in Sacramento, West Sacramento, Fruitridge Pocket, Arden-Arcade, and La Riviera. We cover the ZIP codes 94245, 94246, 94247, and 94248. No trip charge inside the county.
Serving Sacramento, CA - Our Local Coverage Area
We’re based in the Sacramento 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 Sacramento
A room addition in Sacramento typically runs $45,000 to $130,000, while an ADU runs $90,000 to $220,000 for a new detached unit and $30,000 to $80,000 for a garage conversion. Your specific number depends on your parcel’s flood zone, soils report, and existing electrical service. Call (877) 610-1318 for a written line-item quote, not a phone ballpark.
Yes, every eligible job includes permits pulled and inspections signed. In Sacramento, additions and ADUs frequently require a FEMA flood-zone review and finished floor elevation coordination with the City’s floodplain management office. We handle that. The permit inspector works for you, not for us, and that is exactly why we like him on the job.
Only if you change the scope, and only in writing. Every allowance, every material upgrade, every change order arrives on paper before work proceeds. The allowance that is not on paper is a surprise waiting for a date. We do not hand you a different bill at the door.
Plan on four to seven months for a detached ADU in Sacramento once the permit is issued. The FEMA flood-zone review and Adobe clay soils testing can add weeks before construction starts, which is why we begin the permit and soils work immediately after your written approval. Call (877) 610-1318 and we will give you a realistic schedule, not a sales pitch.
We serve the full Sacramento metro, including Midtown, East Sacramento, Land Park, Arden-Arcade, Fruitridge Pocket, and La Riviera, plus the ZIP codes 94245 through 94248. No trip charge inside the county. Call (877) 610-1318 and ask for Tom.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Sacramento. Founded 1998, owner-operated from day one.