ADU’S & Additions
Discover how modern architecture and landscaping can transform your home. From lush gardens to vibrant green lawns, these stunning spaces are designed to elevate everyday living and bring your vision to life.
Unlock the potential of your property with a custom-built Accessory Dwelling Unit (ADU) by Mareci & Steele Construction Company. Based in Altadena, CA, and proudly serving the San Gabriel Valley and surrounding areas, we specialize in transforming garages, backyards, and underutilized spaces into high-quality living areas that add value, flexibility, and opportunity to your home.
An ADU not only provides additional living accommodations for family or tenants, but it also increases your property’s value, generates extra income, and makes the most of your existing space. With the rising demand for housing near city centers, an ADU is one of the smartest investments you can make for your future.
Ready to explore your options?
Call us today at (626) 662-4771 to schedule your FREE, On-Site Estimate and take the first step toward maximizing your property’s potential.
Why Choose Mareci & Steele Construction Company for Your ADU Project?
Decades of Experience in building ADUs, garage conversions, and custom home additions
The professionals you can trust!
Tailored Design Solutions to match your needs, budget, and vision
Complete Project Management from permits to final finishes
Transparent Communication with homeowners and stakeholders every step of the way
Quality Craftsmanship using only premium, durable materials
We work closely with you and anyone else involved to design a custom plan that fits your needs and ensures a smooth construction process from start to finish.
At Mareci & Steele, we believe a great project starts with listening carefully, planning thoughtfully, and delivering exceptional results.
Our Services Include:
Garage Conversions to ADUs
Detached and Attached ADU Construction
Custom Additions and In-Law Suites
Backyard Guest Houses
Full-Scope Remodeling and Renovation Services
Outdoor Living Space Design and Construction.
Build Your Future with Confidence
When you work with Mareci & Steele Construction Company, you’re choosing peace of mind. We use only highly-trained craftsmen, the best materials, and proven construction techniques to ensure your project exceeds expectations with no surprises and no compromises.