Room Additions & Expansions
Expand your home
Making Life Better In Greater Phoenix & East Valley
When your family outgrows your home, you don’t have to move. You can build. Runyon Construction Group specializes in room additions and home expansions for residents throughout Greater Phoenix, the East Valley, and Maricopa and Pinal counties. With over 20 years of construction experience in Arizona, we design and build seamless additions that look and feel like they’ve always been part of your home.
Room additions are one of the most effective ways to increase your living space and your home’s value. Whether you need an extra bedroom for a growing family, a dedicated home office, an expanded family room, a sunroom, or a casita for guests, our team handles every phase of the project, from architectural design and permitting to foundation work, framing, roofing, and interior finishing.
In Arizona, room additions require careful consideration of the desert climate. We engineer additions with proper insulation, energy-efficient windows, and HVAC integration to ensure your new space stays comfortable year-round without driving up your energy bills. We also match existing rooflines, exterior finishes, and landscaping to create a cohesive look that enhances your home’s curb appeal.
Our room addition process starts with a thorough evaluation of your property, including lot setbacks, zoning requirements, and structural considerations. We work with local municipalities in Chandler, Gilbert, Mesa, Tempe, Scottsdale, Queen Creek, and other East Valley communities to ensure all permits and inspections are handled properly. Our in-house team manages foundation, framing, electrical, plumbing, drywall, painting, and flooring so you have a single point of accountability.
Second-story additions are another option we offer for homeowners who want to build up rather than out. These projects maximize your existing footprint and can add significant square footage without reducing yard space. Our structural engineers assess your existing foundation and framing to ensure safe, code-compliant construction.
Arizona’s real estate market rewards additional square footage. A well-built room addition can recoup 50-70% of its cost at resale while providing immediate lifestyle benefits. Home offices, in particular, have seen surging demand as remote work continues to reshape how families use their homes.
We also build detached structures like casitas, studios, and accessory dwelling units (ADUs) that are becoming increasingly popular in the Phoenix metro area. These versatile spaces can serve as guest quarters, rental income, home gyms, or creative studios.
At Runyon Construction Group, we pride ourselves on delivering room additions that exceed expectations. Our dedicated project managers keep you informed at every stage, and our skilled craftsmen ensure every detail is executed to the highest standard. Contact us today for a free consultation and estimate.
Our Work
Remodeling Services Include:
Bedroom & Living Room Additions
When your family needs more space, a bedroom or living room addition is the most straightforward solution. We design and build additions that blend seamlessly with your existing home, matching rooflines, exterior finishes, and interior details. Every addition includes proper insulation, HVAC integration, and electrical service for year-round comfort.
Home Office & Study Additions
Remote work has made dedicated home office space a top priority for Arizona homeowners. We build quiet, well-lit office additions with built-in desks and shelving, dedicated electrical circuits, data cabling, and climate control. These purpose-built workspaces help you stay productive without sacrificing your living areas.
Sunroom & Arizona Room Builds
Arizona rooms and sunrooms let you enjoy the desert landscape in comfort. We build enclosed or semi-enclosed spaces with large windows or glass walls, ceiling fans, insulated roofing, and optional climate control. These versatile rooms serve as reading nooks, dining areas, or relaxation spaces that connect you with the outdoors.
Second-Story Additions
Building up instead of out preserves your yard space while adding significant square footage. Our structural engineers assess your existing foundation and framing to ensure safe construction, and we design second-story additions that complement your home's architecture. These projects typically add bedrooms, bathrooms, or bonus rooms above the existing footprint.
Casita & ADU Construction
Detached casitas and accessory dwelling units are increasingly popular in the Phoenix metro area. We build standalone structures that serve as guest quarters, rental units, home gyms, or creative studios. Each casita includes its own entrance, bathroom, kitchenette, and climate control for fully independent living.
Foundation & Structural Engineering
Every room addition starts with a solid foundation. We work with licensed structural engineers to design foundations that meet local soil conditions and building codes. Our team handles site preparation, concrete work, anchor bolts, and framing connections to ensure your addition is structurally sound for decades to come.
HVAC Integration & Energy Efficiency
Adding living space without proper climate control defeats the purpose, especially in Arizona. We integrate new additions into your existing HVAC system or install dedicated mini-split units to keep the space comfortable year-round. Proper insulation, energy-efficient windows, and sealed ductwork ensure your energy bills stay manageable.
Exterior Matching & Seamless Design
The best room additions look like they have always been part of the original home. We carefully match stucco textures, paint colors, roofing materials, trim profiles, and architectural details so the transition between old and new is invisible. Our attention to exterior continuity protects both your home's appearance and its resale value.
Frequently Asked Questions
Room addition costs typically range from $150-$300+ per square foot depending on complexity, finishes, and whether plumbing is involved. A 200 sq ft addition might cost $30,000-$60,000+. We provide free detailed estimates.
Yes. All room additions require building permits and must meet local zoning and setback requirements. We handle all permitting and inspections as part of our service.
Most room additions take 8-16 weeks from groundbreaking to completion. Second-story additions and projects requiring extensive structural work may take longer. We provide a detailed schedule upfront.
Absolutely. We carefully match rooflines, siding, stucco, paint colors, and interior finishes to ensure your addition looks like an original part of your home.
Yes. Many clients choose to include a bathroom in their addition, especially for master suite or casita projects. We handle all plumbing rough-in and fixture installation.