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Arizona's PREFERRED Home Addition Company!

At Experts in Construction & Home Improvement, we understand that sometimes your home needs to grow with you. Whether your family is expanding, you're working from home more often, or you simply need more functional space—our custom home addition services provide a smart, lasting solution. We help Arizona homeowners add square footage without the hassle of moving, while ensuring that every new space blends seamlessly with the existing structure.

Our team brings over 25+ years of construction expertise to every addition project, managing everything from foundation and framing to plumbing, electrical, and finishing details. We handle the entire process, from design to permits to final inspection, keeping you informed and confident along the way. Whether you're adding a new bedroom, building a guest suite, or expanding your kitchen or living space, we make the process efficient and stress-free—with beautiful results that stand the test of time.

Foundations

We handle excavation, grading, and slab/footing pours for code-compliant foundations engineered for Arizona soils—built to support your addition for decades.

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Framing

Precision framing for straight, level, load-bearing walls, roofs, and ceilings—seamlessly matched to your home’s design for a durable build.

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Electrical

Licensed electricians install code-compliant lighting, outlets, and smart-home wiring to power your addition safely and efficiently.

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Plumbing

Rough-in and finish plumbing for baths, kitchens, and laundry—water, drain, and vent—tied cleanly into your existing system.

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Custom Home Additions in Arizona

Arizona homeowners trust us to create seamless home additions that look and feel like they were always part of the original build. We work closely with you to design additions that reflect your lifestyle, your property's layout, and your long-term goals. Whether you’re in Phoenix, Mesa, Chandler, or anywhere in the Valley, we’ve got the local experience to build additions that make sense for Arizona homes—taking sun exposure, insulation, and energy use into account from the start.

From extra bedrooms and home offices to Arizona rooms and in-law suites, we build smart, modern spaces that increase your home’s value and usability. We handle every step—from structural design and materials selection to inspections and final walkthroughs. We don’t just build additions—we build peace of mind.

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Home Addition Process

Types of Home Additions

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Our ４-Step Home Addition Process

❶

Assessment & Consultation

We begin with a thorough walkthrough and planning session. During this phase, we learn about your space needs, design preferences, and budget. We also assess zoning requirements, site layout, and access for construction to ensure the plan is feasible and functional.

❷

Agreement & Permitting

Once you approve the design, we draft a detailed agreement outlining all costs, deliverables, and schedules. We then handle all permitting and paperwork to ensure your addition complies with Arizona building codes and local regulations.

❸

Materials & Preparation

We help you select finishes, materials, and fixtures that match your home and lifestyle. Before construction begins, we prep the site, protect surrounding areas, and coordinate deliveries to keep the build organized and on schedule.

❹

Inspections & Finalization

After construction is complete, we conduct final inspections to ensure everything meets structural, electrical, and plumbing codes. We walk you through the finished space, answer any questions, and ensure you’re fully satisfied before we close out the project.

Attached Home Additions

Attached additions expand your living space while maintaining direct access to the main home. We build bedrooms, bathrooms, family rooms, and expanded kitchens that flow naturally from your existing floor plan. These spaces are fully integrated with your home’s HVAC, plumbing, and electrical systems.

Attached Home Additions

Detached Home Additions

Detached additions offer privacy and flexibility—ideal for workshops, studios, guest quarters, or rental units. We handle every aspect of detached structures, from site prep to utilities, ensuring they complement your existing home and meet local zoning and permit requirements.

Detached Home Additions

Arizona Rooms

An Arizona room, or sunroom, gives you the perfect blend of indoor comfort and outdoor ambiance. We design and build custom Arizona rooms with energy-efficient windows, insulation, and climate-friendly materials that allow year-round enjoyment, even in extreme weather.

Arizona Rooms

Garage Addition

We offer garage expansions and new garage builds that improve storage and increase home value. Whether it’s a single- or multi-car structure, we ensure proper drainage, code-compliant electrical, and seamless exterior finishes that match your existing home.

Garage Addition

Guest House

Guest houses, or casitas, are one of the most popular additions for Arizona homeowners. We build fully functional guest homes complete with plumbing, HVAC, and independent entries. Great for visitors, aging family members, or short-term rentals, each guest house is custom-designed to fit your lot and needs.

Guest House

In-Law Suites

An in-law suite is a self-contained living space within or attached to your home, designed to offer privacy while keeping family close. We build accessible, well-equipped suites with their own bathroom, kitchenette, and private entrance—perfect for multigenerational living.

In-Law Suites

Why Local Property Owners Choose Us

Experts in Construction & Home Improvement is Arizona’s trusted source for reliable, professional home additions. Our team manages every step of the process with integrity, clarity, and hands-on experience. From navigating city codes and HOA requirements to ensuring every finish detail is perfect, we’re the builder you can depend on.

Our clients come to us because we’re honest, responsive, and deliver consistent results. We respect your time, your space, and your investment—and we don’t leave until the job is done right. When you choose ECHI, you’re not just adding square footage—you’re investing in quality craftsmanship and a better way to live.

  • Locally Owned & Operated – Deep roots in the community with a reputation you can verify.
  • Over 25+ Years of Experience – We’ve seen it all and solved it all with precision and care.
  • Certified & Insured Crews – Professionalism and peace of mind on every job site.
  • Transparent Estimates – No hidden fees, no surprises—just honest pricing and clear expectations.
  • A+ BBB Rating – A proven track record of trust and integrity.

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Areas Served

  • Maricopa County, AZ
  • Phoenix, AZ
  • Scottsdale, AZ
  • Glendale, AZ
  • Peoria, AZ
  • Fountain Hills, AZ
  • Chandler, AZ
  • Queen Creek, AZ
  • Paradise Valley, AZ
  • Surprise, AZ
  • Mesa, AZ
  • Cave Creek, AZ

Services Offered


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