Sacramento's Trusted ADU Contractor

Why Sacramento Homeowners Choose Future Generation Construction for ADUs

An accessory dwelling unit is one of the most consequential building decisions a Sacramento homeowner can make. The wrong contractor turns it into the most expensive mistake on your property; the right one turns it into a 5–10 year payback investment that adds long-term cash flow and resale value. Future Generation Construction has built every kind of ADU across the Greater Sacramento Area: garage conversions in Citrus Heights ranches, modern detached units in Granite Bay, two-bedroom backyard cottages in El Dorado Hills, and JADUs inside aging Carmichael homes.

What sets us apart is a single project manager from contract through Certificate of Occupancy, in-house tradespeople (no subcontractor scheduling gaps), line-item itemized fixed-price contracts, and direct experience with the permit processes in Sacramento County, Placer County, and El Dorado County. We are fully licensed (CA #1119373), bonded, and insured; both certificates land in your project folder before any saw runs.

What you should expect from any ADU contractor

• A written, fixed-price quote with line items for design, permits, materials, labor, and contingencies. "Time and materials" pricing on an ADU is a red flag — the scope is too well-defined to need it.
• Proof of license, bond, and insurance before the contract is signed. The CSLB license number is verifiable on cslb.ca.gov in 30 seconds.
• A single point of contact who knows your project file. Hand-offs between sales, design, and construction departments cause 80% of mid-project communication failures.
• Daily progress updates during construction. We send photos and a status note from the project manager every working day.
• A realistic timeline presented before signing. Anyone promising a 3-month detached ADU is either skipping permits or hasn't read the latest building code.

Understanding ADUs — Four Types, Different Tradeoffs

California groups ADUs into four configurations. Picking the right type for your property is the single most important early-stage decision; it determines budget, timeline, rental income potential, and resale value.

Detached ADU

A standalone structure on your property — fully independent home with its own entrance, kitchen, bathroom, and utility connections. State law allows up to 1,200 sq ft. Detached ADUs cost the most upfront ($200,000 – $450,000+) but generate the highest rental income ($2,000 – $3,000/month) and add a discrete appraisable asset to your property. Read more on our dedicated Detached ADU page.

Attached ADU

An addition that shares a wall with the main house but has a separate entrance, kitchen, and bathroom. Attached ADUs are capped at 50% of the primary house size with a 1,200 sq ft ceiling. They're less expensive than detached because of shared structural elements, and they integrate visually with the main house. Best when your lot has limited backyard space.

Garage Conversion

Convert your existing garage into a fully-permitted dwelling. The most cost-effective ADU option ($100,000 – $175,000) because the foundation, framing, and roof already exist. Most Sacramento garages are 400–500 sq ft, perfect for a studio or compact one-bedroom unit. Read our complete guide on Garage Conversion ADUs.

Junior ADU (JADU)

A unit up to 500 sq ft created inside the existing footprint of the primary residence — typically by partitioning off a portion of the home with a separate entrance and kitchenette. JADUs may share a bathroom with the main house. The most affordable path to ADU rental income, but with the smallest footprint.

California ADU Laws — A 2025–2026 Quick Reference

California has reshaped ADU regulation over the past five years, dramatically reducing the friction homeowners face. Here is what currently applies:

• AB 976 (effective 2025+): Owner-occupancy requirement removed. You no longer have to live on the property where your ADU is located. Pure rental investments are now legal.
• AB 1154 (effective 2026): JADU owner-occupancy requirement waived when the JADU has a separate bathroom.
• SB 543 (effective 2026): Jurisdictions must determine application completeness within 15 days. Miss the deadline, and the application is automatically deemed complete.
• SB 937 (effective 2026): Impact fees now collected at final inspection, not at building permit issuance — a major cash-flow improvement.
• AB 2533 (effective 2026): Streamlined legalization path for previously unpermitted ADUs that meet current health and safety standards.
• State setback rules: 4-foot side and rear setbacks; jurisdictions cannot increase. 16-foot height for one-story; 25-foot height for two-story under SB 477 conditions.
• Impact fee exemption: ADUs ≤ 750 sq ft are exempt from impact fees. Larger ADUs are pro-rated.

For a complete walkthrough of the permit process by county, see our dedicated ADU Permits page.

ADU Cost Breakdown for Sacramento (2025–2026)

The honest answer to "how much does an ADU cost?" is "it depends on the type, size, and finish level." Here are real ranges from our recent local projects:

Garage Conversion ADUs

• Studio + kitchenette + bath, 400–450 sq ft: $100,000 – $145,000 all-in.
• One-bedroom + full kitchen + bath, 450–500 sq ft: $130,000 – $175,000 all-in.

Detached ADUs

• Studio (500–600 sq ft): $200,000 – $260,000.
• One-bedroom (700–800 sq ft): $240,000 – $320,000.
• One-bed + den (900–1,000 sq ft): $280,000 – $375,000.
• Two-bedroom (1,000–1,200 sq ft): $320,000 – $450,000+.

These figures include design, permits, materials, labor, and utility connections all the way to a Certificate of Occupancy. They are not "starting at" prices that balloon during construction. For a full breakdown by line item, see our ADU Cost Guide.

Soft costs to budget alongside construction

• Permits and plan check fees: $4,000 – $12,000.
• Impact fees (only for ADUs over 750 sq ft): $5,000 – $25,000.
• School district fees: $1,500 – $6,000.
• Sewer/water connection (if separate metering): $3,000 – $10,000.
• HERS testing: $500 – $1,200.
• Soils report (where required): $1,500 – $3,500.

Financing Your ADU Project

Most Sacramento homeowners finance their ADU through one of four paths:

1. Cash-out refinance. The new ADU's value is reflected in the appraisal, often allowing a refi at a similar loan-to-value ratio. The most common path for clients with existing equity.
2. Home Equity Line of Credit (HELOC). Flexible draw schedule, interest-only payments during construction. Rate-sensitive but lower closing costs than a refi.
3. CalHFA ADU Grant. Up to $40,000 from the State of California for income-qualified homeowners. Funding cycles are competitive — apply early.
4. Construction-to-permanent loan. A single closing that converts to a mortgage at completion. Best for homeowners without sufficient existing equity.

We can connect you with lenders who specialize in ADU financing if it's helpful. For a broader overview of payment options on any of our remodeling services, see our Financing page.

The ADU Construction Process — Step by Step

Every ADU we build follows the same project-management framework. The pieces vary by ADU type, but the rhythm is consistent.

1. Initial consultation (free, 60–90 minutes). Project manager visits your property, walks the lot, photographs conditions, discusses goals and rough budget.
2. Design and quote (3–7 business days after the visit). We deliver a written scope, conceptual layout, material recommendations, line-item budget, and timeline.
3. Contract and design refinement. Selections finalized, contract signed.
4. Construction documents (4–6 weeks). Full building plans, structural calcs, Title 24 energy compliance, ready for permit submission.
5. Permit and plan check (6–10 weeks county-dependent). We submit, respond to plan-check comments, and pull the permit when it's issued.
6. Site preparation and foundation (2 weeks for detached; skipped for conversions).
7. Framing and dry-in (3–4 weeks for detached; 1 week for conversions).
8. Mechanical, electrical, plumbing rough-in (2 weeks).
9. Inspections, drywall, finishes (8–10 weeks).
10. Final inspection and Certificate of Occupancy (1–2 weeks).
11. Post-completion follow-up. 30-day check-in. 90-day in-home walk-through if requested. 1-year warranty.

Total elapsed time is typically 9–14 months for a detached ADU and 4–6 months for a garage conversion.

ADU Rental Income — What Can You Actually Earn?

Rental rates vary by ADU size, finish level, and submarket. Recent Sacramento-area numbers from rentals we have either built or visited:

• Studio garage conversion: $1,500 – $1,900/month long-term; $2,500 – $3,500/month for short-term rental in permitted markets.
• One-bed garage conversion: $1,800 – $2,200/month long-term.
• 500–700 sq ft detached studio/one-bed: $2,000 – $2,600/month.
• 900–1,200 sq ft detached one-bed/two-bed: $2,400 – $3,000/month.

Rates trend higher in Granite Bay, El Dorado Hills, Folsom, and Loomis. They trend lower in some inner-city Sacramento submarkets but are offset by faster lease-up times because of higher rental demand.

Payback math at $2,000/month rent

A $130,000 garage conversion generates roughly $24,000/year gross rent. After typical operating expenses (insurance, taxes, vacancy reserve, modest repairs), net cash flow lands around $18,000–$20,000/year — a 5.5–7 year payback on the original investment. After payback, the unit produces near-pure cash flow for the rest of its life and adds significant resale value to the property.

Common ADU Mistakes — and How We Avoid Them

1. Hiring a general remodeler with no ADU-specific experience. ADUs have their own permitting nuances, energy compliance documentation, and inspection sequencing. Pick a contractor who has built at least 5 ADUs in the same county where you're building.
2. Choosing the cheapest bid. The lowest bid almost always reflects either an underestimated scope (change orders coming) or a substandard finish package. Compare line-by-line, not just total.
3. Skipping the permit process. Unpermitted ADUs surface during home sales and tank the deal. AB 2533 (2026) creates a legalization path, but the cost and friction far exceed pulling the permit on day one.
4. Underestimating utility connections. Sub-meter vs. dedicated meter, gas line trenching, sewer ties, water-pressure adequacy — these have to be reviewed up front. We do that during the feasibility consultation, not after foundation pour.
5. Building too small to maximize rental return. The cost difference between a 500 sq ft studio and a 700 sq ft one-bedroom is small (~$30,000), but the rental difference is $300–$500/month — a 1–2 year payback on the bigger unit alone.
6. Ignoring the impact-fee threshold. ADUs ≤ 750 sq ft skip impact fees entirely. Building 760 sq ft instead of 750 sq ft can add $5,000–$25,000 in fees with zero rental income upside.
7. Underestimating soft costs. Permits, school fees, soils reports, HERS testing — these add 5–10% to the construction-only number and surprise budget-margin homeowners.

Service Areas — ADU Construction Across the Greater Sacramento Region

We serve all 14 cities in our 30-mile service radius. Click any city below for response-time, recent local projects, and the specific permitting pathway:

• ADU Construction in Citrus Heights
• ADU Construction in Sacramento
• ADU Construction in Roseville
• ADU Construction in Folsom
• ADU Construction in Fair Oaks
• ADU Construction in Carmichael
• ADU Construction in Orangevale
• ADU Construction in Rancho Cordova
• ADU Construction in Granite Bay
• ADU Construction in Rocklin
• ADU Construction in El Dorado Hills
• ADU Construction in Elk Grove
• ADU Construction in Lincoln
• ADU Construction in Loomis

Beyond the Basics — Additional ADU Knowledge

Can the ADU be sold separately from the main house?

Generally no. ADUs are accessory to the primary residence and cannot be sold independently on the same lot under current state law. There are emerging exceptions for ADUs in some condo-converted situations — consult your real-estate attorney if this is a goal.

Will the ADU affect my homeowner's insurance?

Yes, you should add the ADU to your homeowner's policy or carry a separate landlord policy on the unit. Premiums typically increase $300–$800/year depending on coverage limits. Notify your insurer before the unit is occupied.

What about HOAs?

California state law preempts most HOA restrictions on ADUs. HOAs cannot ban ADUs outright, though they retain some design-review authority on aesthetics. We pull your CC&Rs during planning and review any HOA restrictions before submitting permits.

Can I use a pre-approved plan to speed up permits?

Sacramento County offers a pre-approved plan program with shorter review times (often 2–4 weeks faster than custom review). We'll check whether one of the pre-approved plans fits your lot before recommending a custom design.

What happens if I want to add a second story to an existing ADU later?

Possible but expensive. Adding a second story to an existing single-story ADU requires structural reinforcement of the foundation, additional load calculations, and re-permitting. If you suspect future expansion, design the original ADU with a "stub-up" foundation rated for two stories — adds ~$8,000–$12,000 today, saves $40,000+ later.

Explore ADU Sub-Services in Depth

Each major ADU configuration has its own dedicated page with deep-dive content, project examples, and sub-service-specific cost ranges:

• Garage Conversion ADU — most cost-effective ADU type, $100K–$175K.
• Detached ADU Construction — standalone units up to 1,200 sq ft, premium rental income.
• ADU Permits in Sacramento — county-by-county permit guide.
• ADU Cost Guide — line-item breakdown for every ADU type.

For complementary remodeling services on the primary residence, see our Kitchen Remodel and Bath Remodel service pages.

Recent ADU Projects in the Sacramento Area

Browse completed ADU work across our portfolio:

• Roseville Detached ADU — 550 sq ft modern farmhouse one-bedroom with butcher block kitchen, designer tile bath, walk-in shower, and full independent utility connections.
• Garage ADU Conversion in Sacramento — complete 500 sq ft studio with sage-green cabinets, white quartz, and modern walk-in shower with penny tile floors. Includes a video testimonial from the homeowner.
• Fair Oaks Attached ADU — closely-related attached configuration on a Fair Oaks property.

The full portfolio filters by project type — select the ADU pill to see every ADU we have completed.

Ready to Start Your ADU Project?

Future Generation Construction is a fully licensed (CA #1119373), bonded, and insured contractor based in the Greater Sacramento Area. Every ADU project includes a free in-home consultation, a written fixed-price quote, a single project manager from start to Certificate of Occupancy, and a 1-year installation warranty. We've been featured in client video testimonials, earned 5.0★ across 120 reviews on Google, Yelp, Angi, HomeAdvisor & Thumbtack, and have completed projects across all 14 Sacramento-area cities we serve.

Schedule your free estimate or call (916) 677-9774 — most homeowners hear back from us within 24 hours, often the same business day. We'll walk your property, discuss design and budget options, and provide a written feasibility report within 5 business days. No pressure, no obligation, no hidden fees.