
If you’re a homeowner in Murrieta, CA, considering building an Accessory Dwelling Unit (ADU), one of the first questions on your mind is likely: “How much is this going to cost?” At Woollard Construction, we understand that building an ADU is a big investment, and costs can vary depending on size, design, and permits. In this guide, we’ll break down the costs, factors, and considerations to help you make an informed decision.

Understanding ADU Costs in Murrieta, CA
The cost of building an ADU Murrieta, CA typically ranges between $150,000 and $350,000, depending on whether you’re building a detached ADU, attached ADU, or converting an existing structure like a garage. Here’s a breakdown of what influences the total cost:
1. Size of the ADU
- Studio or 1-bedroom ADU: $150,000 – $200,000
- 2-bedroom ADU: $200,000 – $300,000
- Luxury or custom ADU: $300,000+
Larger ADUs naturally require more materials, labor, and permits, which drives up costs.
2. Type of Construction
- Detached ADU: Requires separate foundation, plumbing, and utilities – generally more expensive.
- Attached ADU: Cheaper since it shares walls, roof, and utilities with the main home.
- Garage Conversion: Often the most cost-effective, starting around $100,000 – $150,000.
3. Design and Materials
High-end finishes, energy-efficient appliances, and smart-home features can increase your budget. Even the choice of flooring, cabinets, and countertops affects the final cost.
4. Permits and Fees in Murrieta, CA
Building an ADU requires permits from the City of Murrieta. Fees typically range from $5,000 to $15,000 depending on the project scope. Woollard Construction handles permit applications to streamline the process.
5. Utility Connections
If your ADU requires a new water, sewer, or electrical connection, expect $10,000 – $20,000 in additional costs.
Ways to Save on Your ADU Construction
Building an ADU doesn’t have to break the bank. Here are some strategies to reduce costs without compromising quality:
- Opt for an attached or garage conversion ADU rather than a detached unit.
- Choose standard materials and finishes instead of custom options.
- Hire an experienced local contractor like Woollard Construction to avoid costly mistakes and delays.
- Plan your ADU design early to minimize changes during construction.
Frequently Asked Questions About ADU Costs in Murrieta, CA
Q1: Can I finance an ADU in Murrieta, CA?
Yes! Many homeowners use construction loans, home equity loans, or special ADU financing programs to fund their projects.
Q2: How long does it take to build an ADU in Murrieta?
On average, construction takes 4 to 8 months, depending on size and complexity.
Q3: Will an ADU increase my property value?
Absolutely. A well-designed ADU can add 20-30% to your property value while generating rental income.
Q4: Are there restrictions on ADU rentals?
Murrieta allows ADUs to be rented, but you must follow city zoning and building regulations.
Why Choose Woollard Construction for Your ADU
At Woollard Construction, we specialize in building high-quality ADUs in Murrieta, California. From the initial design to permit approvals and construction, our team ensures:
- Transparent pricing
- Timely project completion
- Attention to detail on every ADU
- Expert advice to maximize your investment
Whether you want a cozy studio or a full 2-bedroom ADU, we make the process stress-free and affordable.
Ready to Build Your ADU in Murrieta, CA?
If you’re ready to increase your home’s value, add rental income, or create extra living space, Woollard Construction is here to guide you every step of the way. Contact us today at (951) 551 6165 for a free consultation and accurate cost estimate for your ADU project.
Spencer Woollard
Spencer Woollard has 30+ years of experience in custom construction in Southern California. With over 350 completed projects including ADUs and bathroom remodels, Spencer is a trusted local contractor in Temecula, CA.



