A professional architectural and engineering design company.
We exist to make residential design simpler, faster, and more reliable for California homeowners—combining practical engineering, thoughtful architecture, and deep permit expertise.
By the numbers
Residential design in California is evolving. Building codes are more complex, city requirements vary widely, and homeowners need solutions that are both compliant and buildable. We believe architecture and engineering should be client-first, technically strong, and focused on helping projects move forward—without unnecessary delays.
We were always told that design can't be both innovative and practical. We disagreed.
For years, the industry relied on outdated processes and fragmented services—leading to slow reviews, unclear drawings, and repeated corrections. After working across California's cities and experiencing these challenges firsthand, we knew homeowners deserved better. Cecilia Home was built to deliver clear communication, technically accurate plans, and a streamlined path to permit approval.
Cecilia Home began in 2019 From the start, we built every workflow, drawing standard, and engineering process from scratch—modern, efficient, and optimized for California’s permit environment. No legacy shortcuts. No outdated templates.
We operate differently — built on engineering, technology, and accuracy.
Unlike traditional design or drafting companies, we leverage advanced tools such as Matterport 3D scanning (learn more) to capture precise on-site conditions, eliminating guesswork and ensuring every measurement is correct from day one. Combined with intelligent AI workflows, we deliver faster, clearer, and more dependable solutions while staying focused on what matters most: safe, compliant, and buildable designs for California homeowners.
Founding Team
Mason Zheng, Founder & Principal Engineer
Cecilia Home is led by dedicated professionals who combine structural expertise with a deep understanding of California’s residential needs.
Mason Zheng brings over two decades of engineering experience to California’s residential and commercial sectors. After earning his civil engineering degree, he began his career at the Los Angeles Department of Water and Power in 2000, contributing to major infrastructure projects across the region.
His work included significant upgrades at Los Angeles International Airport and key municipal facilities—experience that gave him deep familiarity with California building codes, regulatory environments, and high-precision structural requirements.
Recognizing the growing demand for residential engineering and permit-ready design, Mason founded Cecilia Home in 2019. Today, he leads the team in delivering architectural and structural plans that are clear, code-compliant, and designed to pass city review efficiently—helping homeowners build with confidence.
Team
Team
Our diverse team of experts brings together decades of experience in design, engineering, and project management across California.
Mason
CEO / Professional Engineer
Collin
Project Manager
Jeffey
Project Manager
Stephen
Architectural Design Lead
Welly
Structural Design Lead
Charine
Client Manager
Melchor
Client Manager
Alex
Client Manager
Client Testimonials
Trusted by California Homeowners
Ranked #1 on Thumbtack based on verified reviews from homeowners who relied on our architectural and structural engineering services.
Cecilia Home designed our complete home renovation, explained everything clearly, and delivered detailed plans. Honest, professional, and fairly priced—our HOA now knows exactly how to proceed.
View Verified ReviewTrudy M.
Home Remodeling
Mason delivered exactly what I needed—professional, responsive, and great value. Clear communication throughout the process. I'll rely on him for all future remodeling projects.
View Verified ReviewJoanne D.
Home Remodeling
Mason responded instantly and offered honest guidance on whether my garage conversion would pass city review. Knowledgeable, direct, and trustworthy—I look forward to working with them again.
View Verified ReviewJasper T.
ADU Design
I appreciated their honesty. They explained that my foundation cracks were common in the Bay Area and didn't push unnecessary work. Professional, transparent advice I could trust.
View Verified ReviewArturo S.
Structural Engineering
As a general contractor, I value teams who are responsive and accurate. Cecilia Home delivered clear communication, timely plans, and over-the-counter approval. I highly recommend them.
View Verified ReviewKevin V.
Building Permit Services
Mason gave detailed structural guidance for removing our load-bearing wall, including safety considerations. Quick responses and practical advice that helped us comply with local regulations.
View Verified ReviewJackson B.
Wall Removal