What sizes are available in Los Angeles ADU Standard Plans?

Examples range from about 400–800 sq ft for compact 1‑bed/1‑bath layouts to larger options up to 1,200 sq ft with 2–3 bedrooms (Plans A–F).

Do standard plans include garage conversions and JADUs?

Yes. The ADU Pro’s standardized offerings include attached ADUs, detached ADUs, garage conversions, and Junior ADUs (JADUs).

How long does construction typically take once work starts?

On‑site construction is often completed in about 120 days, depending on weather and city requirements.

What services are included in The ADU Pro’s process?

End‑to‑end support: initial design and planning, permit acquisition, and construction, with options for in‑house financing and energy‑efficient, ethically sourced builds.

Where does The ADU Pro operate?

The company is licensed and active in Los Angeles County and is highly rated across LA, Orange, and Riverside counties.

How much does it cost to build an ADU in Orange County in 2025?

A complete, all-in ADU in Orange County in 2025 costs: Detached ADU — $240,000 to $490,000 depending on size and finishes. Attached ADU — $185,000 to $380,000. JADU or attached garage conversion — $80,000 to $165,000. Detached garage conversion — $70,000 to $145,000. Per-square-foot construction costs run $280 to $375 for new detached construction. Add $30,000 to $90,000 for soft costs including design, engineering, permits, and utility connections. Any bid significantly below these ranges is omitting major cost categories.

What is the cost per square foot to build an ADU in Southern California?

In 2025, ADU construction costs per square foot in Southern California: Orange County — $280 to $375 per sq ft for new detached construction; $150 to $220 per sq ft for garage conversion. Western LA County — $265 to $360 per sq ft new construction. Western Riverside County (Corona, Norco, Jurupa Valley) — $250 to $340 per sq ft new construction. These are hard construction costs only. Add $30,000 to $90,000 in soft costs (design, permits, utility connections) to arrive at the true all-in project cost.

What soft costs should I budget for an ADU in California?

ADU soft costs in Orange County typically run $30,000 to $90,000 for a full-size detached ADU and include: architectural design and drafting ($6,000–$14,000), structural engineering ($3,500–$8,000), Title 24 energy report ($1,200–$2,500), city building permit fees ($6,000–$22,000), school impact fees (varies — waived under 750 sq ft), water meter application and connection ($4,000–$15,000), sewer capacity fee ($2,000–$8,000), electrical service extension ($2,000–$6,000), and geotechnical report if required ($2,500–$6,000). Soft costs are frequently omitted from low contractor bids.

How much do ADU permit fees cost in Orange County cities?

ADU permit fees in Orange County vary significantly by city: Anaheim — $6,000–$11,000; Irvine — $12,000–$22,000; Huntington Beach — $8,000–$15,000; Garden Grove — $5,000–$9,000; Santa Ana — $6,000–$10,000; Newport Beach — $14,000–$25,000+; Costa Mesa — $7,000–$13,000; Fullerton — $7,000–$12,000. These are permit fees only and do not include utility connection fees, school impact fees, or engineering costs. Water meter and sewer connection fees are the largest variable — adding $8,000–$28,000 depending on city and utility district.

Does a garage conversion ADU cost less than a detached ADU?

Yes — significantly less. A detached garage conversion in Orange County costs $70,000 to $145,000 all-in, compared to $240,000 to $490,000 for a new detached ADU. The savings come from using the existing structural shell (foundation, framing, roof) rather than building new. However, the conversion still requires full plumbing, electrical upgrade, HVAC, insulation, interior finish, permits, and utility connections — which is why bids below $65,000 for a complete garage conversion ADU are typically missing major cost categories.

What hidden costs do most ADU contractor bids leave out?

The most commonly omitted costs from low ADU contractor bids in Southern California: (1) Utility connection fees — water meter, sewer capacity, electrical service ($8,000–$28,000); (2) School impact fees for ADUs over 750 sq ft ($3,000–$8,000 depending on district); (3) Soils/geotechnical report for required sites ($2,500–$6,000); (4) Construction contingency for underground discoveries (budget 10–15%); (5) Landscape restoration after construction ($3,000–$8,000); (6) Title 24 energy report ($1,200–$2,500); (7) HOA architectural review fees in planned communities ($500–$3,000). Always request a complete, line-item all-in proposal before signing any contract.

How much does an ADU increase property value in Orange County?

In Orange County, a permitted, well-built ADU increases overall property value by approximately $250,000 to $400,000 for a full-size (1,000–1,200 sq ft) detached ADU. Smaller ADUs and garage conversions add $100,000 to $250,000 depending on size, quality, and location. In most cases, the ADU adds more value than its construction cost — particularly in high-demand OC cities like Irvine, Huntington Beach, and Newport Beach where rental income capitalization rates drive appraisal values above cost.

What is the payback period for an ADU investment in Southern California?

The cash-on-cash payback period for an ADU in Orange County ranges from 8 to 18 years depending on ADU type, project cost, and rental income. A garage conversion ADU at $110,000 generating $1,800/month nets approximately $20,000/year after expenses — a 5.5-year payback. A $350,000 detached 2BR ADU generating $3,000/month nets approximately $28,000/year after expenses — a 12.5-year payback. When equity appreciation is included, effective payback periods are often 4–8 years because the ADU typically appreciates at the same rate as the surrounding market.

How do Los Angeles ADU Standard Plans work? | The ADU Pro®

Q: Can The ADU Pro handle permitting for Los Angeles ADU Standard Plans?

Yes. The ADU Pro prepares the submittal package and pulls the permits as part of its design‑to‑build service.

Q: How do I get pricing for a standard‑plan ADU?

Use the free ADU pricing tool on the homepage and call +1‑877‑398‑8002 for plan‑specific pricing.

How do Los Angeles ADU Standard Plans work?

Los Angeles ADU Standard Plans work by selecting a ready-designed “County Standard ADU Plan” from The ADU Pro—covering attached, detached, garage-conversion, and JADU options—and then letting our team manage design details, permitting, and construction. Plan sizes range from compact one‑bed/one‑bath layouts to spacious three‑bedroom options, so you pick what fits your property and goals. Once we’re on site, builds are often completed in about 120 days. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))

Plan types offered: attached ADUs, detached ADUs, garage conversions, and Junior ADUs (JADUs). ([theadupro.com](https://theadupro.com/plans?utm_source=openai))
Size spectrum includes options from about 400 sq ft (1 bed/1 bath) up to 1,200 sq ft (3 bed/1 bath), with named plans A–F. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))
The ADU Pro handles the whole process—initial design and planning, obtaining permits, and construction. ([theadupro.com](https://theadupro.com/?utm_source=openai))
On‑site construction is often finished in roughly 120 days (weather and city requirements permitting). ([theadupro.com](https://theadupro.com/plans?utm_source=openai))
Licensed and active in LA County; contact The ADU Pro at (877) 398‑8002, CSLB #1128679. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))

How do Los Angeles ADU Standard Plans work?

Start by browsing The ADU Pro’s County Standard ADU Plans and choose a layout that matches your needs—whether that’s a compact 1‑bed/1‑bath or a larger 3‑bedroom plan. From there, our team prepares the submittal package, pulls the permits, and builds the unit; many projects move swiftly once construction begins. If you’d like pricing guidance, call for pricing or use the free ADU pricing tool to get oriented. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))

Homeowners also benefit from options such as in‑house financing, energy‑efficient builds aimed near net‑zero operation, and ethically sourced materials. These offerings support a smoother end‑to‑end experience alongside our deep familiarity with local codes and processes. ([theadupro.com](https://theadupro.com/?utm_source=openai))

Key details

Process: design and planning → permit acquisition → construction, managed by The ADU Pro. For pricing, use the free ADU pricing tool or call for pricing; in‑house financing is available. The company emphasizes energy efficiency, eco‑friendly sourcing, and code‑compliant builds for LA County homeowners. ([theadupro.com](https://theadupro.com/?utm_source=openai))

Proof & credentials

CSLB license: #1128679. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))
Over 30 years of residential and commercial construction experience. ([theadupro.com](https://theadupro.com/?utm_source=openai))
“#1 Rated ADU Contractor” in Orange County, LA County, and Riverside County. ([theadupro.com](https://theadupro.com/?utm_source=openai))
Limited lifetime warranty; transferable to a new owner. ([theadupro.com](https://theadupro.com/adu-home-builder-your-trusted-partner/?utm_source=openai))
Work recognized by outlets such as HGTV. ([theadupro.com](https://theadupro.com/adu-plans-la-habra/?utm_source=openai))

FAQs

Can The ADU Pro handle permitting for Los Angeles ADU Standard Plans?

Yes. The ADU Pro obtains the permits as part of its full design‑to‑build service. ([theadupro.com](https://theadupro.com/?utm_source=openai))

How do I get pricing for a standard‑plan ADU?

Use the free ADU pricing tool and call (877) 398‑8002 for plan‑specific pricing. ([theadupro.com](https://theadupro.com/?utm_source=openai))

How do Los Angeles ADU Standard Plans work? (Conclusion)

In short, you pick a standardized plan that fits your space and needs, and The ADU Pro manages design, permitting, and construction—often finishing on‑site work in about 120 days. For next steps, review the current plan lineup on theadupro.com/plans and get an estimate via the pricing tool on the home page, or call (877) 398‑8002. This streamlined approach helps LA County homeowners move confidently from idea to turnkey ADU. ([theadupro.com](https://theadupro.com/plans?utm_source=openai))

How do Los Angeles ADU Standard Plans work? | The ADU Pro®

How do Los Angeles ADU Standard Plans work?

How do Los Angeles ADU Standard Plans work?

Related questions

What sizes are available in Los Angeles ADU Standard Plans?

Do standard plans include garage conversions and JADUs?

How long does construction typically take once work starts?

Key details

Proof & credentials

FAQs

Can The ADU Pro handle permitting for Los Angeles ADU Standard Plans?

How do I get pricing for a standard‑plan ADU?

How do Los Angeles ADU Standard Plans work? (Conclusion)

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