West Menlo Park is one of the Peninsula’s most desirable communities—offering tree-lined streets, proximity to Stanford, and peaceful residential living with easy access to Silicon Valley. With growing families, shifting work-from-home needs, and a rising demand for flexible housing, more homeowners are choosing to build Accessory Dwelling Units (ADUs) as a smart, stylish solution.

At Royalty Builders, we specialize in building high-end ADUs in West Menlo Park, tailored to your home, your property, and your lifestyle. Whether you’re looking to add a private rental, a guest suite, or a home office sanctuary, we’ll help you bring it to life—from design to final walkthrough.

🛠️ Full-Service ADU Design + Build in West Menlo Park

Our team offers an all-in-one experience, managing every phase of your ADU project with precision, transparency, and care. No need to juggle architects, engineers, and contractors—we handle it all.

✅ Property Assessment & Feasibility – We determine what’s possible based on your lot size, zoning, and goals
✅ Custom Design & Layout – Your ADU will reflect your needs and complement your existing home
✅ Permit Management – We handle all paperwork and coordination with San Mateo County
✅ High-Quality Construction – Built to last, with premium finishes and thoughtful details
✅ Turnkey Completion – Fully compliant, inspected, and ready for immediate use

Whether you’re adding space for family, creating an income stream, or preparing for future flexibility, we make the process seamless.

🧱 Types of ADUs We Build in West Menlo Park

We offer a range of ADU types to suit your vision, your lot, and your lifestyle:

• Detached ADUs – Standalone guesthouses, ideal for extended family or tenants

• Garage Conversions – Efficiently transform underused garages into full living spaces

• Attached ADUs – Add extra space to your existing home with private access

• Above-Garage ADUs – Make the most of vertical space for offices, studios, or rental units

• Junior ADUs (JADUs) – In-home units with shared amenities, perfect for compact living

Every ADU is custom-built to blend beautifully with your main residence—maintaining architectural integrity and increasing your property’s value.

📍 Why Build an ADU in West Menlo Park?

Whether you’re thinking long-term or just need more usable space now, ADUs offer unmatched versatility in West Menlo Park’s upscale residential setting.

✔️ Support Multi-Generational Living – House elderly parents or adult children nearby but independently
✔️ Earn Extra Income – West Menlo Park’s rental demand makes ADUs a strong investment
✔️ Create a Dedicated Workspace or Studio – Separate work from home life with a beautiful, private office
✔️ Increase Property Value – An ADU adds square footage and long-term appeal
✔️ Take Advantage of California’s ADU Laws – Streamlined approvals, flexible use, and growing homeowner incentives

💲 ADU Construction Costs in West Menlo Park

ADU costs vary depending on your lot, access, existing structures, and level of finishes. In West Menlo Park, homeowners often choose higher-end features and finishes, so we build accordingly.

• Garage Conversions: from $100,000–$165,000

• Detached ADUs: typically $225,000–$450,000+

• Attached ADUs: usually $175,000–$325,000

• Above-Garage ADUs: starting around $250,000–$400,000+

📌 We provide clear, itemized estimates and help you plan for utilities, site access, permits, and custom design work. No surprises—just informed decisions and beautiful results.

📝 Permits for ADU Construction in West Menlo Park – What You Need to Know

West Menlo Park is located in unincorporated San Mateo County, which means ADU permitting is handled through the San Mateo County Planning and Building Department. As experienced contractors familiar with county requirements, we handle everything—from planning to final sign-off.

Here’s how the process works:

🔹 Property Review & Zoning Compliance
We confirm that your property meets minimum zoning requirements and complies with setbacks, height limits, and lot coverage.

🔹 ADU Design & Architectural Plans
Our design team creates ADU plans that blend seamlessly with your home, comply with county design standards, and reflect your goals.

🔹 Permit Submission & Review
We prepare and submit all required documents, including site plans, floor plans, energy compliance (Title 24), structural engineering, and stormwater management (if applicable).

🔹 County Review & Revisions
We work directly with the county to respond to feedback, revise plans if needed, and move your permit forward quickly.

🔹 Inspections & Certificate of Occupancy
After construction, we coordinate all county inspections and obtain final approval—ensuring your ADU is 100% legal and ready to use.

✅ San Mateo County complies with California’s 60-day ADU approval timeline and allows ADUs up to 1,200 sq. ft. on most residential lots. We make the process fast, efficient, and stress-free.

👷 Why Choose Royalty Builders as Your West Menlo Park ADU Contractor?

We understand the unique demands of working in West Menlo Park—where aesthetics, quality, and thoughtful design truly matter. Our team takes a concierge-style approach to every project, ensuring your ADU is not just functional, but a perfect match for your home and neighborhood.

Here’s what sets us apart:

• 🏗️ Complete Design + Build Services Under One Roof

• 📍 Experience with San Mateo County Permits & Requirements

• 🧱 Custom, Architecturally Matched Construction

• 🛠️ Premium Materials, Luxury Finishes

• 🧑‍💼 One Point of Contact for a Streamlined Experience

We build ADUs that work for you now—and enhance your property for years to come.

❓ FAQ – ADUs in West Menlo Park

Q: Can I build both an ADU and a JADU in West Menlo Park?
A: Yes, most single-family properties in San Mateo County allow one detached ADU and one JADU, depending on zoning.

Q: How long does it take to get permits?
A: San Mateo County generally processes ADU permits within 60 days, per California law.

Q: Do I need extra parking for my ADU?
A: Not always. Parking is often waived if you’re near public transit or converting an existing structure.

Q: Can I rent my ADU out?
A: Yes. Long-term rentals are permitted. Short-term rental rules may vary and should be verified with the county.

📞 Contact Us – Build Your West Menlo Park ADU with Confidence

Ready to add more space, function, and value to your West Menlo Park property? Whether you’re building for family, income, or lifestyle, Royalty Builders will help you design and build a stunning, code-compliant ADU that fits your vision.

📞 Call us today and schedule a free consultation.

Let’s bring your ADU to life—with thoughtful design, expert construction, and seamless service from start to finish.