ADU Cost in Anaheim - Design, Permits and Build Under One Contract

How Much Does an ADU Cost in Anaheim?

A typical detached ADU in Anaheim runs $180,000 to $340,000 in 2026, all-in. A garage conversion usually lands between $85,000 and $160,000. A smaller JADU (junior ADU, a compact unit carved out of existing living space) often comes in around $60,000 to $110,000.

Those are real numbers for the Anaheim market, not a teaser range. What you actually pay depends on size, whether you’re converting or building new, and how much site work your lot needs. Below, we break down each line item so you can see where the money goes before anyone picks up a hammer.

Lodgewick ADU Builders has been part of the Kingswell family of home-service companies since 2010, and every project we build runs under The Kingswell Guarantee: a written price before work starts, a defined arrival window, a clean job site, and a written guarantee on every job.

Quick Answer: What’s the Realistic Price Range?

• Detached new-construction ADU (600 – 1,000 sq ft): $180,000 – $340,000
• Garage conversion ADU: $85,000 – $160,000
• JADU (converted space inside the main home): $60,000 – $110,000
• Prefab ADU (delivered and set): $130,000 – $260,000
• Attached addition ADU: $200,000 – $360,000

Bottom line: most Anaheim homeowners building a comfortable one-bedroom detached unit should plan for the $200,000 range and adjust from there. If you want a firm number instead of a range, we’ll give you one in writing before any work begins.

ADU Cost Breakdown (2026)

For a garage conversion, you skip the foundation and shell costs almost entirely, which is why that path saves so much. You’re reusing the existing slab, walls, and roofline. What you gain in framing savings, you spend on bringing the space up to current code for habitation: insulation, egress windows, a full bathroom, and a kitchenette.

On a prefab unit from a manufacturer like Abodu, Cover, Dvele, Mighty Buildings, Boxabl, or Plant Prefab, the module itself usually accounts for $90,000 to $180,000 of the total. Site work, foundation, and utility hookups make up the rest. Prefab can be faster, but it isn’t automatically cheaper. We’ve seen plenty of Anaheim lots where a stick-built unit penciled out better because the property sat on a slope or the setback requirements were tight.

What Pushes the Price Up or Down

The biggest single driver is square footage. Going from 600 to 900 square feet typically adds $50,000 to $70,000 because the foundation, framing, and mechanical systems grow with the footprint. After that, it’s the site itself.

You’ll also pay more for a second bathroom, a full kitchen instead of a kitchenette, and any custom cabinetry or stone counters. Standard finishes land in the low end of every range above. High-end finishes can push a build 20% to 30% higher with no change to the footprint at all.

What Affects ADU Pricing in Anaheim

• Your lot and where it sits. Anaheim properties range from flat lots in West Anaheim to sloped parcels near the Anaheim Hills foothills. A sloped lot needs retaining walls and pier-and-beam foundation work, which can add $15,000 to $35,000.
• Utility distance from the main house. The farther the ADU sits from your main electrical panel and sewer line, the more trenching you pay for. Moving the panel itself is a separate cost and needs a licensed electrician; this is not work to attempt yourself, and we handle the panel and wiring under permit.
• Setbacks and your existing footprint. Anaheim lots in older neighborhoods like the Colony District are often narrow, which limits how wide an ADU can be. Sometimes the answer is a two-story unit; sometimes it’s a garage conversion.
• Building age and code upgrades. If your main home was built before the 1980s, connecting a new ADU may require an upgraded panel or a new sewer lateral to handle the extra load. That can add $8,000 to $25,000.
• Finish level. Vinyl plank and laminate versus hardwood. Stock cabinets versus custom. Tile versus quartz. These choices shift the total more than most homeowners expect.
• Prefab versus stick-built. A panelized or modular unit from a maker like Plant Prefab or Mighty Buildings can shave weeks off the schedule. Whether it saves money depends on your site and how much crane and delivery access you have.

We work with the established ADU brands and materials suppliers, including Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie siding. We match the approach to your lot, your budget, and your timeline rather than pushing one method on every project.

The name Lodgewick comes from an old idea: a lodge is a small house on a larger property. That’s exactly what an ADU is, and it’s the whole reason the company exists. You can learn more home about how we approach these builds from the ground up.

ADU Cost by Type: A Closer Look

Detached New Construction

This is the most flexible option and usually the most expensive. You’re building a separate structure from the ground up, which means a new foundation, new roof, new utilities, and a full set of permits. Anaheim detached units between 600 and 1,000 square feet generally land between $180,000 and $340,000 depending on finishes and site work.

Garage Conversion

Turning an existing garage into living space runs $85,000 to $160,000 in Anaheim. You’re reusing the shell, so the money goes toward insulation, drywall, a bathroom, a kitchenette, proper egress, and mechanical systems. One thing to plan for: converting the garage means you may need to replace the parking it provided, and Anaheim has rules about that. A leftover, worn-out garage door has to come off as part of the conversion anyway, and we handle the full removal and patching as part of the scope.

JADU

A JADU is a junior accessory dwelling unit, a smaller unit built inside your existing home, often from a spare bedroom or an unused section. At $60,000 to $110,000, it’s usually the least expensive path, but it comes with size limits (up to 500 square feet) and a requirement that you live on the property.

Prefab and Panelized

Prefab units from makers like Abodu, Cover, Dvele, Boxabl, or Plant Prefab arrive largely built and get craned or set onto a foundation. Total installed cost in Anaheim typically runs $130,000 to $260,000. Speed is the main advantage; a finished set can happen in a fraction of the time of stick-built construction.

How to Save on an ADU in Anaheim

You don’t have to accept the top of every range. A few choices move the number down without cutting corners on things that matter.

• Start with a garage conversion. Reusing the existing structure is the single biggest cost saver, often $70,000 to $120,000 less than a detached build of similar usable size.
• Keep the unit under 750 square feet. You’ll still build a comfortable one-bedroom home, and you avoid the jump in foundation, framing, and mechanical costs that comes with more square footage.
• Choose standard finishes in the kitchen and bath. Stock cabinets, quartz-look laminate, and mid-grade fixtures look clean and hold up, and they can save $10,000 to $20,000.
• Keep the bathroom count to one. A second bath adds plumbing runs and can push the total up $12,000 or more.
• Place the unit close to your existing utilities. Shorter trenching runs for power, water, and sewer save real money.
• Get a written price before work starts. This is how you actually control the budget. We provide a firm written price before we begin, and it doesn’t change at the door. No surprise line items halfway through the build.

Every estimate from Lodgewick is free, and you’ll get a real number on paper, not a “starting at” figure that grows later. Call (254) 602-5618 for your free estimate. A live person answers, 24 hours a day, seven days a week.

Financing Your Anaheim ADU

Most homeowners we work with don’t pay cash. Common paths include a home equity line of credit, a cash-out refinance, or a construction loan. Because an ADU adds livable square footage and rental potential, many lenders treat it as an improvement rather than a pure expense, which can affect your terms.

We’re not lenders and we don’t sell financing, but we can give you the written scope and price you’ll need to bring to a lender. That document is often the first thing a bank asks for, and it’s the same written price that governs your project from start to finish.

What’s Not Included in These Ranges

An honest cost guide should tell you what it leaves out. Our ranges cover design, permits, construction, and standard finishes. They generally don’t cover:

• Furniture, appliances beyond the standard package, and decor
• Major repairs discovered in the main home during connection work
• Specialty site conditions like rock excavation or an existing septic system
• Solar panels or battery backup, though we can quote those separately

When we inspect your property, we’ll tell you plainly if anything on your lot is likely to add cost. Surprises on the invoice aren’t part of how we work. That’s The Kingswell Way: say the price before the work, show up in the window we gave you, leave the place cleaner than we found it, put the guarantee in writing, and come back if something fails.

Frequently Asked Questions About ADU Cost in Anaheim

How much does an ADU cost in Anaheim in 2026?

A detached ADU in Anaheim typically costs $180,000 to $340,000, while a garage conversion runs $85,000 to $160,000, and a JADU runs $60,000 to $110,000. The final number depends on size, site conditions, and finishes. Call (254) 602-5618 for an exact written price, free of charge.

Is a garage conversion or a new detached ADU cheaper in Anaheim?

A garage conversion is almost always cheaper, usually by $70,000 to $120,000, because you reuse the existing foundation, walls, and roof. On a typical Anaheim lot, a garage conversion lands around $85,000 to $160,000 versus $180,000 to $340,000 for detached new construction. Call us and we’ll tell you which path fits your property.

Can I build an ADU on my Anaheim property?

Most single-family properties in Anaheim can accommodate an ADU, and state law has made approval far more common in recent years. Lot size, setbacks, and parking all come into play. We review your specific parcel and give you a straight answer before you spend anything. Call (254) 602-5618 and we’ll walk through your options.

How long does an ADU take to build in Anaheim?

A garage conversion often takes three to five months, while a detached new-construction ADU usually runs six to ten months from design through final inspection. Permitting and city plan review account for a meaningful chunk of that timeline in Anaheim. A live person can give you a realistic schedule for your specific project when you call.

Does an ADU add value to my Anaheim home?

An ADU typically adds to resale value and rental income potential, though the exact figure depends on your neighborhood and how the unit is used. In a market like Anaheim, where housing demand stays high, a permitted, finished ADU is generally viewed as livable square footage rather than a novelty. To talk through what makes sense for your property, call our team for a free estimate.

Why Homeowners Choose Lodgewick for Their Anaheim ADU

We’ve been building as part of the Kingswell family of home-service companies since 2010, and we operate independently here in the Anaheim market. Every project runs under The Kingswell Guarantee, which means a written price before work begins, a defined arrival window, a clean job site, and a written guarantee on every job.

The 365-Day Done Right Promise is simple to say and simple to stand behind: if the work isn’t right, we come back and make it right. That commitment is in writing on every project, and it includes a free return visit if the work fails within the guarantee period. Every technician on your job site is background-checked and uniformed, so you always know who’s on your property. Our crews work with leading ADU brands and materials, from Abodu and Cover to Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie siding.

Get a real number in writing. Call Lodgewick ADU Builders at (254) 602-5618 for a free estimate. Someone answers the phone every time, day or night, and we’ll tell you exactly what your Anaheim ADU will cost before anyone starts work.

Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving Anaheim since 2010.

Pricing reflects the Anaheim market as of 2026. Lodgewick ADU Builders offers free estimates – call (254) 602-5618.