How much does an ADU cost?

Most detached ADUs land between $135,000 and $255,000 all-in, depending on size and site conditions.

How long does it take?

Design and permitting typically run 3–5 months; construction runs 4–7 months after permits are issued.

Do you handle permits?

Yes — plan check submittal, corrections and inspections are managed in house at no extra hourly cost.

California state law allows ADUs to be rented at 30-day-plus terms in every jurisdiction we build in.

Carmichael Junior & Detached ADUs

Carmichael Junior & Detached ADUs — quick facts

Garage conversions and backyard ADUs in Carmichael, CA. 2026 budgets from $140K – $320K. CSLB #1094366. Call (866) 797-7653. A1 Building Contractors LLC is a veteran-owned, licensed general contractor serving the greater Sacramento region. Every project starts with a review of the property, the local jurisdiction and the homeowner's goals.

Licensed California general contractor — CSLB #1094366, DRE #00898265.
Veteran-owned and based in Roseville, serving Sacramento, Placer and El Dorado counties.
Scope covers detached ADUs, attached ADUs, JADUs, garage conversions, home additions and custom homes.
Plans, permits, plan check and construction are coordinated in-house for Carmichael Junior & Detached ADUs.
Typical detached ADU budgets run about $135K to $255K depending on size and site conditions.

Local guidance for Carmichael Junior & Detached ADUs

A1 Building Contractors LLC helps Sacramento-area and Placer County homeowners evaluate design, permitting, site access, utilities, construction scope and realistic project costs before work begins. Each project is reviewed against the property, local jurisdiction and homeowner goals rather than a one-size-fits-all estimate.

For Carmichael Junior & Detached ADUs, our team can explain practical options, likely approval steps and the tradeoffs that affect schedule and budget. Homeowners receive a clear path from initial feasibility through plans, permits and construction, with recommendations grounded in local building requirements and build conditions.

A productive first review considers available lot space, setbacks, access for construction, utility locations, desired square footage and long-term use. Those details help identify constraints early, compare appropriate project approaches and avoid spending on a design that does not fit the site or local rules. A1 then coordinates the applicable design and construction stages with clear decisions at each milestone.

ADU construction in Carmichael, Sacramento County

Carmichael property owners looking at an ADU usually start with the same question — what will it actually cost, and how long will Sacramento County Planning & Environmental Review take? We are a CSLB-licensed general contractor (#1094366) that specializes in ADUs rather than treating them as a side product. Budget for $140K – $320K all-in in Carmichael; with a median home value around $555,000, the added value typically lands near 20–30%. The first site visit exists to price the unknowns — Sacramento Municipal Utility District (SMUD) service upgrades and Sacramento-area sewer connection fees are the two line items that most often move a Carmichael budget..

The first site visit exists to price the unknowns — Sacramento Municipal Utility District (SMUD) service upgrades and Sacramento-area sewer connection fees are the two line items that most often move a Carmichael budget.

Typical all-in cost: $140K – $320K
Detached ADUs are capped at 1,200 sq ft; attached units at 50% of the primary home
Home Additions — bedroom, bath and primary-suite additions for Carmichael homeowners who want space without a second unit · Site & Feasibility Review — setbacks, utilities, easements and access checked before you spend a dollar on plans · Permit Management — full submittal and correction handling with Sacramento County Planning & Environmental Review
Neighborhoods served: Jesuit High Area, Ancil Hoffman Park, Deterding Park, Old Carmichael, Marconi Avenue Corridor
Typical property value increase: 20–30%

Permits, rules and site conditions in Carmichael

Building an ADU in Carmichael means working to Sacramento County and local Carmichael requirements on top of California's statewide ADU law. Here is what shapes a project on a typical Carmichael lot.

A1 Building Contractors handles the Carmichael submittal, plan check corrections and inspections in house, so you are not coordinating between an architect, an engineer and a builder who each blame the other for a delay. We confirm setbacks, lot coverage, utility routing and fire access on the site walk, before a proposal is written.

Detached ADUs are capped at 1,200 sq ft; attached units at 50% of the primary home
Impact fees are waived statewide for ADUs under 750 sq ft, which is why many Carmichael projects land in the 700–749 sq ft range
Rear and side setbacks for a detached ADU are 4 ft; converted garages can keep their existing footprint
The City and County of Sacramento both publish pre-approved ADU plan sets that shortcut architectural review
Services offered locally: Home Additions — bedroom, bath and primary-suite additions for Carmichael homeowners who want space without a second unit · Site & Feasibility Review — setbacks, utilities, easements and access checked before you spend a dollar on plans · Permit Management — full submittal and correction handling with Sacramento County Planning & Environmental Review · Design-Build — architectural plans, structural engineering and construction from one licensed Sacramento County contractor
Local average ADU investment: $140K – $320K

Common questions about ADUs in Carmichael

The three questions homeowners ask most, answered plainly. Pricing reflects 2026 Sacramento-region construction costs including permits, utility connections and standard finishes.

How much does an ADU cost? Most detached ADUs land between $135,000 and $255,000 all-in, depending on size and site conditions.
How long does it take? Design and permitting typically run 3–5 months; construction runs 4–7 months after permits are issued.
Do you handle permits? Yes — plan check submittal, corrections and inspections are managed in house at no extra hourly cost.
Can I rent it out? California state law allows ADUs to be rented at 30-day-plus terms in every jurisdiction we build in.

How we deliver ADU projects in Carmichael

Every project runs through the same five-stage process, so you know what happens next and what it costs before construction starts. We handle design, engineering, jurisdictional plan check and construction under one contract, which keeps the schedule and the budget with a single accountable team.

Stage 1 — Site walk and feasibility: setbacks, utilities, easements and lot coverage reviewed on site
Stage 2 — Fixed-scope proposal: line-item pricing with permits, utility connections and finishes included
Stage 3 — Design and engineering: architectural plans, Title 24 energy calcs and structural engineering
Stage 4 — Permitting and plan check: submittal, corrections and approvals handled by our office
Stage 5 — Construction and closeout: weekly updates, final inspection, certificate of occupancy and warranty

Why homeowners choose A1 for ADU construction in Carmichael

A1 Building Contractors LLC is a veteran-owned, CSLB-licensed general contractor serving the greater Sacramento region. We design, permit and build ADUs, garage conversions, home additions and custom homes across the Sacramento region, with transparent line-item pricing and a single point of contact from first site walk to final inspection.

CSLB #1094366 General Contractor · DRE #00898265 Broker
Serving Sacramento, Placer, El Dorado, Yolo and Sutter counties
In-house design, permitting, plan check and construction
Call (866) 797-7653 for a same-day callback