How Much Does an ADU Cost in Sacramento?

What Does an ADU Cost in Sacramento? — A Transparent Breakdown

The honest answer to "how much does an ADU cost?" is "it depends" — but the variables are knowable. ADU cost depends on three factors: type (garage conversion vs. detached vs. interior JADU), size, and finish level. Future Generation Construction has built dozens of ADUs across the Greater Sacramento Area. The numbers below come from our actual project data, not catalog prices.

Garage Conversion ADU Costs

Studio + Kitchenette + Bath (400–450 sq ft)

$100,000 – $145,000 all-in. Includes:

• Permit, plan check, and impact fees.
• Demolition and infill of the existing garage door.
• Insulation, electrical sub-panel, plumbing rough-in.
• HVAC mini-split.
• Drywall, paint, trim, doors.
• LVP flooring throughout.
• Kitchenette: 36" base + uppers, induction or gas cooktop, undermount stainless sink, quartz top.
• Bath: 32×60 walk-in shower, single vanity, comfort-height toilet, tile floor.

One-Bedroom + Full Kitchen + Bath (450–500 sq ft)

$130,000 – $175,000 all-in. Adds: full-size range, full-size refrigerator alcove, additional partition framing for the bedroom, second egress window for the bedroom.

For more on garage conversion specifics, see our Garage Conversion ADU page.

Detached ADU Costs

Studio (500–600 sq ft)

$200,000 – $260,000 all-in. New foundation, full framing, roofing, all utility connections.

One-Bedroom (700–800 sq ft)

$240,000 – $320,000. Sacramento's rental sweet spot.

One-Bed + Den (900–1,000 sq ft)

$280,000 – $375,000. Flexible second room broadens tenant pool.

Two-Bedroom (1,000–1,200 sq ft)

$320,000 – $450,000+. California maximum for detached ADUs.

For more on detached construction, see our Detached ADU page.

Cost Drivers — What Pushes the Price Up or Down

• Site work. Sloped lots, significant grading, or trenching long utility runs add $5,000–$25,000.
• Foundation type. Slab-on-grade is most cost-effective; crawl-space adds $8,000–$15,000.
• Finish level. Premium counters, wood floors, and designer fixtures add $25,000–$60,000.
• Kitchen scope. A full kitchen with full-size appliances adds $8,000–$15,000 over a kitchenette.
• HVAC. Mini-split is most efficient; ducted system adds $3,000–$6,000.
• Utility separation. Separate meters add $3,000–$8,000 each.
• Two-story design. Adds $40,000–$80,000 over a single-story unit of equivalent square footage.

Soft Costs — What Else to Budget

• Permits and plan check fees: $4,000 – $12,000 (varies by county and unit size).
• Impact fees (if ADU is over 750 sq ft): $5,000 – $25,000.
• School fees (district-dependent): $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 Options

• Cash-out refinance on the primary residence — currently the most common ADU financing path. The new ADU's value is reflected in the appraisal, often allowing a refi at a similar LTV.
• HELOC — flexible draw, interest-only payments during construction. Rate-sensitive.
• CalHFA ADU Grant — state-run grant program offering up to $40,000 toward ADU construction for income-qualified homeowners. Funding cycles are competitive — apply early.
• Construction-to-permanent loan — single-close loan that converts to a mortgage at completion. Best for clients without sufficient existing equity.
• Personal financing — for clients with cash on hand, the simplest option.

We can connect you with lenders who specialize in ADU financing if helpful. For information on financing in general, see our Financing page.

Return on Investment — How Long Until Payback?

Typical Sacramento-area ADU rental rates:

• Studio garage conversion: $1,500 – $1,900/month.
• One-bed garage conversion: $1,800 – $2,200/month.
• 500–700 sq ft detached: $2,000 – $2,600/month.
• 900–1,200 sq ft detached: $2,400 – $3,000/month.

At $2,000/month rent, a $130,000 garage conversion pays back in 5.4 years (gross). Detached ADUs typically pay back in 7–10 years depending on size and rate. After payback, the unit produces near-pure cash flow for the rest of its life — and adds significant resale value to the property.

Pair Cost Knowledge with the Right ADU Type

• Garage Conversion ADU — explore the full range of options inside this service category.
• Detached ADU Construction — explore the full range of options inside this service category.
• ADU Permits in Sacramento — explore the full range of options inside this service category.

Recent ADU Projects with Disclosed Cost Tier

• Roseville Detached ADU — premium 550 sq ft modern farmhouse (high-end finish tier).
• Garage ADU Conversion in Sacramento — mid-tier 500 sq ft studio.
• Fair Oaks Attached ADU — closely-related attached configuration.

Service Areas

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

Frequently Asked Questions About ADU Costs

Why do prices range so widely?

Finish level is the biggest variable. Two ADUs at identical square footage can differ by $50,000+ depending on cabinet quality, counter material, flooring grade, fixture brands, and appliance package.

What's included in your quotes?

Everything to a finished, livable unit ready for Certificate of Occupancy: design, permits, all materials, all labor, all utility connections, and final inspection. We don't surprise you with line items that "weren't in the quote."

What's NOT included?

Items the homeowner controls: appliance brand selection (we provide an allowance you can spend up or down), landscaping outside a 6-foot perimeter, and furniture.

Are there any hidden costs after final inspection?

Property tax reassessment kicks in after final inspection. Plan on roughly 1.1–1.25% of construction cost added to your annual property tax bill.

Can I do part of the work myself to save money?

Some homeowners handle landscaping, painting, or final cleanup themselves. We discourage owner-built rough-in (electrical, plumbing, framing) because it voids our installation warranty and complicates inspections.

What Sets Future Generation Construction Apart on ADU planning Projects

The Sacramento remodeling market has dozens of contractors who can technically install ADU planning — the question that matters for you as a homeowner is which contractor will still be returning your calls in year three when something needs adjustment. Here is what we believe makes our team the right partner for your ADU planning project, and how to evaluate any contractor (including us) against the same standard.

Single Project Manager, Beginning to End

Many remodeling firms hand you off between salespeople, designers, schedulers, and superintendents. By the time you have a question about your ADU planning project, you have already spoken with four people who don't have your project file open. We assign a single project manager from the day you sign the contract through the final walkthrough and the one-year warranty period. One name, one phone number, one inbox.

Transparent Fixed-Price Contracts

Every ADU planning quote we deliver is line-item itemized — you see exactly what you are paying for in materials, labor, permits, and contingencies. The contract is fixed-price for the agreed scope. Change orders only happen when you request a scope change; we don't surprise you with "found conditions" line items at the end.

In-House Tradespeople

ADU planning touches plumbing, electrical, framing, drywall, flooring, and finish carpentry — five separate trade specialties. We employ all five in-house rather than subcontracting individually. The result: faster turnaround, no scheduling gaps where one trade waits on another, and one company accountable when the kitchen / bathroom / ADU comes back online.

Documented Quality Control Process

Every ADU planning install runs through a four-stage QC checklist: rough-in inspection (after demo and before tile/drywall), substrate inspection (before finish surfaces go down), pre-final walk (with the homeowner), and post-final adjustment (anything you flag in the first 90 days is fixed under warranty). The checklist is a written document; we share it with you at the start.

Real Insurance, Real License

We are licensed by the California Contractors State License Board (#1119373), fully bonded, and insured for general liability and workers' compensation. Both certificates are in your project folder before any demo starts. Any contractor offering a ADU planning bid without these credentials is asking you to take on their risk.

Common ADU planning Mistakes — and How We Avoid Them

1. Cutting corners on substrate prep. The fastest way to destroy a beautiful ADU planning install is to fasten finishes over a substrate that wasn't measured, leveled, and dried first. We never skip the prep stage even when the homeowner is impatient to see the finished result.
2. Skipping permits to "save time." Unpermitted ADU planning work often surfaces during a future home sale and tanks the deal. The 4–8 weeks of permit time is an investment, not a tax. We pull permits on every ADU planning project that needs them.
3. Choosing materials by lowest bid alone. The least-expensive option in any ADU planning category is almost never the best long-term value. We will explain the price-vs-lifespan curve for every material we recommend.
4. Hiring separate trades and managing the schedule yourself. Homeowner-coordinated remodels routinely run 2–3× over budget and timeline. The single-source design-build model exists because juggling six trades is a full-time job.
5. Treating warranty as a sales feature, not a real obligation. Our 1-year installation warranty is documented in the contract and we honor it. Fewer than 5% of our projects ever generate a warranty call — the rare ones we do get are addressed within 5 business days.

Working with Us — What to Expect from First Call to Final Walkthrough

1. First call (15 minutes). We discuss your ADU planning goals, timeline, and rough budget, then schedule a free in-home consultation.
2. In-home consultation (60–90 minutes). The project manager visits your home, measures the existing space, photographs conditions, and listens to what you actually want from the finished ADU planning.
3. Design and quote (3–7 business days). We deliver a written scope, layout (where applicable), material recommendations, line-item budget, and timeline.
4. Contract and design refinement. We refine the scope based on your feedback. Material selections finalized. Contract signed.
5. Permit and procurement (2–8 weeks). We pull permits in parallel with ordering long-lead-time materials.
6. Construction start. Pre-start meeting on day 1 to walk the site, set expectations, and review the daily-update protocol.
7. Daily progress updates. Photos and a status note from your project manager every working day.
8. Pre-final walk. You walk the project with your project manager 2–3 days before completion to identify any final items.
9. Final walkthrough. Punch list resolved, you sign off, final balance due. Warranty documents handed off.
10. Post-completion follow-up. 30-day check-in call. 90-day in-home walk-through if requested. 1-year warranty phone call.

For more on our company, philosophy, and history, visit our About page. To explore the full range of adu construction services we offer, see the parent ADU Construction page. Reviews from real Sacramento clients are published on our Reviews page along with video testimonials.

Start Your ADU Cost Conversation

Schedule a free site visit or call (916) 677-9774. We will assess your property, discuss your goals, and provide a transparent budget range within 5 business days.