ADU & Garage Conversions in Brea, California: Affordable and Reliable Solutions for More Space


If you're considering expanding your living space in Brea, California, ADU and garage conversions are practical and efficient solutions. Located in northern Orange County, just 33 miles southeast of Los Angeles, Brea has grown significantly from a population of 39,282 in 2010 to 47,325 in 2020, creating increased demand for innovative housing solutions. At ADU & Garage Conversions in Brea, California, we are fully licensed and insured contractors with over 15 years of experience serving Orange County homeowners from our Huntington Beach headquarters.


We provide expert guidance and quality construction to ensure your ADU or garage conversion meets local regulations and maximizes your property's potential. Whether you need extra living space, a rental unit, or a home office, our team is equipped to deliver tailored results that fit your needs in this thriving city, which was named one of the five best suburbs to live in the Western United States by Sunset magazine.


Understanding the process and benefits of ADU and garage conversions can help you make informed decisions. We are committed to making the transformation seamless and beneficial for homeowners in the Brea area, where the Mediterranean climate with average summer temperatures of 80-86°F and mild winters of 46-70°F creates ideal conditions for construction throughout most of the year.


What Is an ADU?


An accessory dwelling unit (ADU) is a secondary housing unit located on the same lot as a primary residence. It is a fully independent living space, complete with a kitchen, bathroom, and sleeping area.


Garage conversions, by contrast, involve transforming an existing garage into a living space. This space may serve as a bedroom, office, or rental unit, but it often

retains some limitations compared to a stand-alone ADU.


We work closely with homeowners to determine the best option based on their needs. An ADU offers full privacy and can increase property value. Garage conversions provide a cost-effective way to add living space without new construction in Brea's 12.17 square miles of land area where property values have been steadily rising.


Planning and Design Considerations


When planning an ADU or garage conversion in Brea, attention to design, contractor selection, and local regulations is crucial. We emphasize practical layouts and compliance to maximize usability while ensuring legal approval in this historically rich city that has evolved from its oil production roots.


Custom ADU Design and Floor Plans


Creating a functional ADU design starts with understanding the site constraints and homeowner needs. We use advanced 3D modeling software to visualize layouts incorporating essential rooms like kitchens, bathrooms, and living areas within compact footprints.


Our approach prioritizes efficient use of space and natural light, especially important in Brea where the city receives approximately 280 sunny days per year. We exclusively use Energy Star rated windows and appliances to enhance efficiency. Common floor plans range from studio setups to 1- or 2-bedroom units. Attention to storage, entry points, and privacy supports long-term livability.


Garage Remodeling and Renovation Ideas


Garage makeovers transform underutilized garages into versatile living spaces. We focus on premium insulation, drywall, flooring, and lighting upgrades to meet residential standards, with special consideration for Brea's seasonal temperature variations that can range from average lows of 46°F in winter to highs of 86°F in summer.


During garage remodeling, we consider integrating plumbing for kitchens or bathrooms, optimizing electrical wiring, and adding windows or skylights for ventilation. Our repair services include foundation reinforcement, roof repairs, and structural upgrades to ensure converted garages meet all safety requirements. We use only commercial-grade materials from suppliers like Sherwin-Williams, Kohler, and Andersen Windows to ensure durability and quality.


Selecting the Right Contractor 


Choosing experienced contractors and architects who specialize in garage conversions and ADU design is essential. We recommend verifying licenses, reviewing portfolios, and checking local project experience in Brea, where the city has a council-manager form of government that oversees building regulations.


Our company maintains all required state licenses, workers' compensation insurance, and a $2 million liability policy to protect homeowners throughout the construction process. Close collaboration with our in-house garage conversion architects ensures that designs match zoning laws and technical requirements. 


Navigating Building Codes and Regulations

ADU building codes and garage conversion requirements in Brea include setbacks, height limits, and parking rules. We stay current on local ordinances to prevent costly delays in a city where approximately 65% of housing units are owner-occupied.


Understanding permits is critical; separate approvals may be needed for plumbing, electrical, and structural changes. Our permit specialists have a 98% first-time approval rate with Brea's building department. Adhering to fire safety, accessibility, and utility connection standards protects investment and safety.


Costs, Financing, and Value Enhancement


Understanding the typical expenses and funding choices helps us make informed decisions. It also clarifies how converting garages or building ADUs can boost property value and income in Brea, where the median household income was $82,055 according to recent census data.


Estimating the Cost of ADU and Garage Conversions


The cost of ADU construction in Brea typically ranges from $150,000 to $300,000 depending on size, design complexity, and permits. Garage conversion costs usually run lower, often between $50,000 and $120,000, since the existing structure reduces labor. Our transparent pricing includes detailed line-item estimates and a no-surprise guarantee.


Key cost drivers include:


  • Site preparation and foundation work
  • Plumbing, electrical, and HVAC systems
  • Interior finishes and fixtures
  • Permitting fees required by Brea city regulations


We provide free on-site assessments to pinpoint expenses more accurately. Costs may vary if upgrades to utilities or zoning adjustments are necessary.


Financing Options and Budget Planning


We partner with local lenders to offer multiple financing options for ADUs and garage conversions:


  • Home equity loans or lines of credit
  • Construction loans with short-term draws
  • Personal loans depending on creditworthiness
  • Specialized ADU financing programs offered locally


Budget planning must account for upfront costs plus additional expenses like increased property taxes. We recommend obtaining detailed quotes and securing pre-approvals before starting construction to avoid surprises.


Maximizing Property Value 


Adding an ADU or converting a garage can increase property value by 15-25% in Brea's market. It also creates a steady rental income stream, averaging $1,500 to $2,500 per month depending on unit size and amenities.


Considerations for maximizing returns include:


  • Designing units that appeal to renters or multigenerational families
  • Complying fully with Brea's ADU standards to avoid penalties
  • Evaluating property tax implications which may rise after improvements


We advise integrating functional layouts that optimize space to enhance both market value and tenant satisfaction in this city that was originally founded as an oil production center but has since diversified its economy with major employers including Albertsons, Beckman Coulter, and the Brea Olinda Unified School District.


Step-by-Step ADU & Garage Conversion Process


We focus on ensuring each project meets local requirements and proceeds efficiently. Our approach covers the necessary permissions, the stages of building, and available prefab or DIY options to fit various needs in Brea's diverse neighborhoods.


Permitting and Pre-Construction


First, we obtain all required garage conversion permits and approvals from Brea and Orange County authorities. This includes submitting detailed plans showing compliance with setback, height, and floor area ratio regulations.


We work closely with our in-house structural engineers to finalize designs that meet code and align with your property's zoning. Early coordination reduces delays in this city where construction must consider the annual rainfall of approximately 14 inches, mostly occurring between November and March.


Site assessments determine feasibility and identify any existing issues like foundation or utility upgrades. Our comprehensive pre-construction services include soil testing, utility mapping, and existing structure evaluation. Approvals from utility companies may also be required before work begins.


Construction Phases and Timeline


Our construction timeline typically spans 3 to 6 months depending on project complexity and inspections. The process starts with site preparation, including demolition of non-structural elements inside the garage.


Next, we handle structural modifications necessary for conversion, such as framing, insulation, and installing windows or doors to meet building codes. All our work comes with a 5-year workmanship warranty in addition to manufacturer warranties on materials and fixtures.


We install plumbing, electrical, and HVAC systems tailored for ADUs. Then, we focus on interior finishes and exterior landscaping that complements Brea's aesthetic, which includes over 140 public artworks placed throughout the city.


Prefab Kits and DIY Solutions


For clients interested in speeding up the process or managing costs, we offer ADU prefab kits and garage to ADU conversion kits. These kits include pre-designed structural components and detailed instructions.


Prefab kits allow quicker assembly but still require proper permitting and inspections. They are a good option for those with some construction experience or contractors looking to streamline work.


Our DIY ADU support includes guidance on code compliance and sourcing materials, ensuring clients understand what's involved in converting their garages safely and legally in this city that has transitioned from oil and citrus production to a significant retail and commercial center.