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.

Custom Home Builder Roseville, CA

Custom Home Builder Roseville, CA — quick facts

Custom home builder serving Roseville, CA. Real 2026 Placer County pricing, single-source design-build, fixed-price contracts. CSLB #1094366. (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 Custom Home Builder Roseville, CA.
Typical detached ADU budgets run about $135K to $255K depending on size and site conditions.

Local guidance for Custom Home Builder Roseville, CA

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 Custom Home Builder Roseville, CA, 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.

Custom Home Builder in Roseville, CA

Roseville is Placer County's most active custom-home market. Lot supply is tight but real, and the City of Roseville's Planning department has well-defined design review and submittal expectations — which, handled right, makes Roseville one of the faster Placer cities to permit a custom home. A1 Building Contractors builds new custom homes across Roseville on both infill lots and full estate parcels. We're veteran-owned, CSLB-licensed (#1094366), and a licensed California Broker (#00898265) — useful when you're still shopping lots in Morgan Creek, Crocker Ranch, or Westpark. Our pitch is simple: one contract, one project manager, fixed-price, and a real per-square-foot number up front. No teaser pricing, no $40K change-order surprises in month nine.

City: Roseville, Placer County
Design, engineering, permitting and construction under one contract
Veteran-owned · CSLB #1094366

How we deliver Custom Home Builder Roseville, CA

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

Common questions about Custom Home Builder Roseville, CA

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.

Why homeowners choose A1 for Custom Home Builder Roseville, CA

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