California has made it easier than ever to add an Accessory Dwelling Unit to your property, and Orange County homeowners are taking advantage. Whether you're building rental income, creating space for aging parents, or housing an adult child who's priced out of OC's rental market, an ADU is one of the smartest investments you can make on your property.
But "easier" doesn't mean "easy." ADU projects involve city permits, utility connections, setback requirements, Title 24 energy compliance, and — depending on your lot — significant site work before the first wall goes up. JPB Construction builds ADUs across Orange County with an owner who navigates all of this alongside you.
An ADU is also one of the few home improvements that can actually pay for itself. A well-built 600 sqft unit in Orange County rents for $2,000–$3,000 a month. At that rate, your ADU covers its own construction cost in 7–10 years — and adds permanent value to your property the day it's finished.
Standalone units in your backyard, up to 1,200 sq ft under current California law. Full kitchen, bathroom, living area, and independent entry. These are complete homes — just smaller.
Transforming an existing garage into a livable ADU. Often the most cost-effective path because the structure already exists. We handle framing, insulation, plumbing, electrical, HVAC, and all finishes.
Built onto the side or back of your existing home. Shares a wall with the main house but has its own entrance and full living amenities.
Second-story units built on top of an existing garage. More complex structurally, but smart on smaller lots — you keep your parking, keep your yard, and gain a full living unit overhead.
California said you could build an ADU. Your city said 'not so fast.' Every jurisdiction in OC has its own layer of rules, fees, and opinions about what you can build on your own property. Setback requirements, height limits, parking standards, design guidelines — they vary from Irvine to San Clemente. John has built in OC long enough to know what each city's planning department expects and how to get through plan check efficiently.
We handle the permit process from start to finish: architectural plans, engineering, Title 24 energy calcs, and all city submittals. You shouldn't have to become an expert in municipal code to build on your own property.
ADU costs in Orange County typically range from $250 to $450+ per square foot for new construction, depending on your lot, the unit size, finishes, and site conditions. A garage conversion is generally the most affordable option, often running $100,000–$150,000. A 600–800 sq ft detached ADU typically falls in the $200,000–$350,000 range. Higher-end finishes, difficult site access, or long utility runs push costs up from there.
The biggest cost variables are site-specific: distance from existing utility lines, lot slope, access for construction equipment, and your city's specific fee structure. John will assess your property and give you a realistic number.
John will walk your lot, talk through your options, and give you a straight answer on cost and timeline.
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