Room Additions in Tucson, AZ
Expand Your Living Space Without Leaving the Home You Love
Sometimes, the perfect home just needs a little more space. At STM Development LLC, we specialize in room additions for homes in Tucson, Marana, Oro Valley, Sahuarita, Green Valley, and surrounding Arizona communities, helping homeowners expand their square footage with smart, seamless additions that match their lifestyle and add long-term value.
Whether you’re growing your family, working from home, or simply want more functional space, our licensed, bonded, and insured team brings over 25 years of hands-on construction experience to every addition we build. We handle everything—from design and permitting to construction and final inspection—so you can enjoy a stress-free expansion that blends beautifully with your existing home.
Room Addition Services We Offer
✅ Master Bedrooms
Spacious and relaxing, our master bedroom additions offer more privacy, comfort, and value for your home.
✅ Guesthouses
We build detached or attached guesthouses that are perfect for visiting family, rental income, or private retreats.
✅ Game Rooms and Man Caves
Entertainment spaces built around your lifestyle—perfect for games, movies, hobbies, or relaxing.
✅ Home Offices and Storage Rooms
Create a dedicated workspace or organize your life with added storage and functional design.
✅ Laundry Rooms and Bathrooms
Add convenience to your daily routine with custom-built laundry rooms or extra bathrooms tailored to your layout.
We also take on large addition projects, including master lofts, workshops, RV garages, and more—all built to blend beautifully with your existing home structure and style.
Why Homeowners Choose STM Development LLC
We’ve earned a strong reputation in Southern Arizona for attention to detail, construction quality, and dependable service. We are fully licensed, bonded, and insured, and a proud member of the NFIB and the Arizona Registrar of Contractors.
Our goal is to help you build equity and comfort into your home—one square foot at a time.
📞 Get Started on Your Room Addition Today
Call (520) 850-4130 to schedule your free estimate. At STM Development LLC, we make it easy to add the space you need—built right, built to last.