Highest ROI Home Investment

ADU Construction
Greater Sacramento Region.
Built to Perform.

Altec Construction has built custom ADUs across the greater Sacramento region since 1994 — Roseville, Rocklin, Folsom, El Dorado Hills, Granite Bay, Lincoln, Auburn, Carmichael, and beyond. We handle design, permits, and every nail in between. CA License #740844.

Start Your ADU Project View Our ADU Work
30+ Years Building
$180K+ Starting Investment
#740844 CA Licensed
CA License #740844
Full Permit Management
Est. 1994 — Roseville, CA
Acorn Finance Available
5-Star Rated
Modern detached ADU accessory dwelling unit exterior with landscaping in Sacramento California
What Is An ADU?

A Second Home on Your
Existing Property

An Accessory Dwelling Unit (ADU) is a fully independent residence — kitchen, bathroom, sleeping area, private entrance — built on your existing residential lot. California's ADU legislation now makes them easier to permit than ever, and Sacramento-area homeowners are using them to generate income, house family, and dramatically increase property value.

  • Generate $1,500–$3,000/month in rental income
  • Add $150,000–$300,000 to your home's appraised value
  • House aging parents or adult children nearby
  • Convert unused garage or bonus space efficiently
  • Fully independent — separate entrance, utilities, and address
  • Qualify for ADU-specific financing and incentives in CA
ADU Types We Build

Every Property Is Different.
So Is Our Approach.

We build all four ADU types recognized under California law — and we'll help you determine which is right for your lot, goals, and budget.

Detached ADU

A fully standalone structure in your backyard — maximum privacy and highest rental potential. The most versatile option for income generation or multi-generational living.

Most Popular

Garage Conversion ADU

Transform an underused attached or detached garage into a fully permitted living unit. The fastest path to an ADU with the least new construction required.

Best Value

Attached ADU

An addition to your primary home with its own private entrance and full independent living amenities. Ideal for family proximity with total independence.

Multi-Gen Favorite

Junior ADU (JADU)

Up to 500 sq ft entirely within your home's existing footprint. The fastest permit path and lowest cost — perfect for generating rental income quickly.

Quickest to Permit
Why Altec Construction

Greater Sacramento Region's
ADU Builder Since 1994.

Thirty years of Sacramento-area construction means we've navigated every lot, every city hall, and every challenge across the region — and we know exactly how to deliver.

Permit Expertise

We manage the entire permit process — city, county, HOA. Our team knows Roseville, Rocklin, Folsom, and Sacramento regulations inside and out. No surprises, no unnecessary delays.

Design-Build Under One Roof

From architectural design through final inspection, one team owns your entire project. No handoffs. No miscommunication. Faster timelines and single-point accountability.

Transparent, Fixed Pricing

We provide detailed scopes and pricing before breaking ground. No surprise change orders. Your investment is defined and protected from day one through project completion.

Local, Licensed Crews

Every tradesperson is licensed, insured, and local to the Sacramento region. We don't farm your project to strangers — we build with trusted partners we've vetted for years.

ROI-First Design

Our ADUs are designed to maximize rental yield and resale value. Smart layouts, durable finishes, and energy-efficient systems that attract quality tenants and command premium rents.

Flexible Financing Options

Through our Acorn Finance partnership, homeowners can get pre-qualified in minutes with no credit score impact. We'll help you find a payment structure that makes your ADU a reality today.

ADU Cost — Greater Sacramento Region

How Much Does an
ADU Cost?

ADU construction costs vary across the Sacramento region based on type, size, finishes, and site conditions. Here's a transparent look at what our clients invest — and what they get back.

Typical Investment Range
$180,000 – $350,000

Detached, attached, and garage conversion ADUs in Sacramento. Junior ADUs start at a lower price point.

Finance your ADU through Acorn Finance. Get pre-qualified in minutes with no impact to your credit score. Flexible monthly payment options available for qualified homeowners.

Key Cost Factors
  • ADU Type JADU → Detached
  • Square Footage 400 – 1,200 sq ft
  • Kitchen & Bath Finishes Standard → Custom
  • Site Conditions Grading, Utilities
  • City Permit Fees Varies by Jurisdiction
  • Avg. Rental Income $1,500 – $3,000/mo
  • Est. Property Value Added $150K – $300K

Every property is unique. Request a free site consultation for a precise estimate based on your specific lot and goals.

Our ADU Build Process

From Consultation
to Certificate of Occupancy

We guide you through every phase so you always know what's happening, what's next, and why.

Free Consultation

We visit your property, assess feasibility, review zoning, and discuss your goals. Zero obligation or pressure.

Design & Scope

Our in-house designers create architectural plans tailored to your lot, HOA requirements, budget, and lifestyle vision.

Permitting

We submit and manage all city and county permit applications — navigating California ADU regulations so you don't have to.

Construction

Our licensed crews build your ADU with consistent milestone updates. You're always informed — never left wondering.

Final Walkthrough

We walk through every detail together before you sign off. Your satisfaction isn't a formality — it's the standard.

ADU Construction Service Area

We Build ADUs Across
the Sacramento Region

Altec Construction serves homeowners throughout Sacramento and Placer counties. If you're in the greater Sacramento area, we can build your ADU.

ADU FAQs

Common Questions About
ADU Construction in California

Most ADU projects run 6–12 months from initial design to certificate of occupancy. Garage conversions are typically faster (4–7 months). The permitting phase varies by city — Roseville and Rocklin are generally efficient, while Sacramento County can take longer. Altec's permitting experience minimizes delays.
California law (AB 68 and subsequent ADU legislation) allows ADUs on most residential lots — both single-family and multi-family properties. Specific rules vary by city, lot size, and zoning designation. We assess your specific parcel during your free consultation to confirm exactly what's buildable.
Short-term rental rules vary by city across the Sacramento region. Roseville, Folsom, Elk Grove, Rocklin, and Sacramento each have their own STR ordinances, and some require owner-occupancy on the property. Long-term (12+ month) rentals are broadly permitted throughout California. We recommend verifying current local STR rules before building with that intent.
Yes, but only the value of the new construction is reassessed — not your entire property (thanks to Proposition 13). Your existing home's tax basis stays the same. The ADU addition is assessed at current market value, resulting in a modest, proportional increase that is typically far outweighed by the rental income generated.
We're a full design-build firm. That means we handle architectural plans, structural engineering coordination, permit applications, utility connections, all trades (framing, electrical, plumbing, HVAC, finish work), and final inspections. One team, one contract, one point of contact from consultation to keys.
Common options include cash-out refinancing, HELOCs (home equity lines of credit), ADU-specific construction loans, and renovation loans. We also partner with Acorn Finance, which offers fast pre-qualification with no credit score impact and flexible monthly payment terms for qualified homeowners.