Southern California's
Trusted Builders
Your go-to for residential and commercial builds, remodels, and general contracting.
Build With Us
Our Build
Cosine Construction is a proven leader in residential and commercial construction, serving Southern California with a reputation built on precision, quality, and expertise. From designing custom homes and transforming living spaces to managing large-scale commercial developments, we deliver exceptional results on every project. At Cosine Construction, our commitment to excellence ensures that each build, renovation, or development provides enduring value and brings your vision to life.
Our Services
RESIDENTIAL DESIGN-BUILD
As design-build experts, we manage projects from concept to completion, ensuring a seamless process. Our services include custom home building, remodelling, kitchen and bathroom renovations, room additions, and ADUs. We also handle general repairs, including structural, roofing, plumbing, and electrical work. Every project is tailored to your vision, timeline, and budget.
COMMERCIAL DESIGN-BUILD
As commercial design-build experts, we manage projects from concept to completion, ensuring a seamless process. Our services include public works projects, tenant improvements, and multi-family developments. Every project is customized to align with your vision, timeline, and budget.
GENERAL CONTRACTOR
We manage projects with a highly experienced team bringing over 20 years of combined expertise. Our diverse workforce, alongside a select group of trusted subcontractors, ensures your project is completed on time and within budget. We are dedicated to delivering the highest quality results.
FIREPROOF BUILD
Cosine Construction specializes in fireproof construction, offering custom fire-resistant homes, additions, and renovations. We provide expert fireproofing, consultations, and inspections for residential and commercial properties. Protect your investment with durable, high-quality craftsmanship designed for peace of mind.
Projects
At Cosine Construction, we are committed to delivering excellence by adhering to the highest industry standards. Our approach ensures that every project is executed with precision, care, and professionalism.
Learn More From
Frequently Asked Questions
We specialize in residential construction, including custom home building, remodeling, renovations, ADUs (Accessory Dwelling Units), and general repairs and maintenance.
Project timelines vary depending on the size and complexity. We work closely with clients to provide realistic timelines and ensure timely delivery without compromising quality.
Yes, we offer free initial consultations and estimates to discuss your project needs and provide a clear understanding of costs and timelines.
About Founders
We Are Leading International Company In The World
Steven Marks
CEO
Lara Smith
Interior Designer
John Doe
Engineering Manager
Testimonials
Built on Trust and Excellence
Our clients’ words reflect our commitment to quality, reliability, and personalized solutions.
Engineering Manager
Alice Howard
Cosine Construction exceeded my expectations with their attention to detail and quality craftsmanship. The results were outstanding!
Manager
Ann Smith
The team at Cosine Construction delivered on time and beyond expectations. Their dedication to excellence is unmatched!
Architect
Ema Romero
I was impressed by their professionalism and ability to bring my vision to life. They truly understand design and functionality.
Interior Designer
Nathan Marshall
Working with Cosine Construction was a pleasure. Their expertise and commitment to best practices made the entire process seamless.
Get a Quote
Ready to start your next project? Whether it’s a custom home, a remodel, or a large-scale development, Cosine Construction is here to bring it to life. Let’s build something exceptional together.
