Build A Custom ADU

On Time, On Budget

Built to Last

Three fully customizable ADU floor plans — delivered with the same craftsmanship Fortress has provided for almost 20 years.

90+

AZ Projects Completed

$1.3B

AZ Construction Invested

$115k

ADU’s Starting Price

Request a Free ADU Quote

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— Fully Customizable Plans, or Start Fresh

Custom ADUs, Designed for the Arizona Lifestyle

Each plan is fully customizable, or choose to work with our team to create your own — choose your finishes, exterior style, and layout tweaks. Every build will be permitted and code-compliant for Maricopa County. Click “View Floor Plan” to see the full layout.

The Sonoran

566 Sq Ft · 1 Bed · 1 Bath

From $115,000 — Fully built & permitted

View Floor Plan

The Mesa

800 Sq Ft · 1 Bed · 1 Bath

From $150,000 — Fully built & permitted

View Floor Plan

The Pinnacle

900 Sq Ft · 1 Bed · 1 Bath

From $170,000 — Fully built & permitted

View Floor Plan

— How it works

From Consultation to Move-In — We Handle Everything

01 Free Consultation

We visit your property, assess your lot, and walk through design options that fit your space, goals, and budget — no pressure, no obligation.

02 Planning & Permits

Our team manages drawings, city submittals, inspections, and every permit checkpoint. You stay informed without dealing with the city yourself.

03 Expert Construction

Our licensed Arizona trades build your ADU with quality materials suited for the desert climate. We coordinate every subcontractor on your behalf.

04 Final Walkthrough

You inspect every detail before we hand over the keys. We don’t consider the job done until you’re completely satisfied — that’s the Fortress standard.

"Our goal is simple: an integrity-first approach to deliver the home you envision while making the process organized, transparent, and stress-free."

Jason Ratke

CEO

— Why Fortress Residential is always "integrity-first"

Fortress Residential is a family-owned Arizona contractor built on doing right by every homeowner we serve. With 35+ years of builder experience and over $1.3 billion in Arizona construction assets delivered, our track record reflects a simple commitment: we do what we say we’ll do, and we stand behind every project that carries the Fortress GCI name.

Owner and President Jason J. Ratke is an OSHA-certified project manager with over 20 years in Arizona residential and multifamily construction. He’s personally accountable on every job — no hand-offs to subcontractors who don’t share our standards, no shortcuts that compromise the work. With the Fortress GCI name on a project, our reputation is on the line.

When you hire Fortress Residential, you’re working with an Arizona construction team that knows Arizona codes, desert construction challenges, and Maricopa County permitting, inside and out — and you’re working with a team that will tell you the truth about your project, your timeline, and your budget, even when it isn’t the easy thing to say.

— What Homeowners Say

Built on Trust. Proven by Results.

    
 
 
       Posted on Google  
   
   Amy Whitworth 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently experienced a storm that tore the majority of my roof off and created water damage throughout the house.  Once I met with my insurance adjuster and the claim was approved, I had Fortress Contracting start rebuilding. Jason and his crew were fast, professional, and courteous. They showed up exactly when they said they would, kept the worksite incredibly tidy, and the quality of the new roof is impeccable. Jason maintained clear communication throughout the construction phase, always keeping us informed of the progress.  Fortress made a stressful time, a lot easier.
  
 
      Posted on Google  
   
   Chase Moll 
 
 
 
 Trustindex verifies that the original source of the review is Google. My project is off to a great start. Bill has been great to work with.
  
 
      Posted on Google  
   
   Hayley Froilan 
 
 
 
 Trustindex verifies that the original source of the review is Google. The best general contracting company hands down! I promise you will not find better.
  
 
      Posted on Google  
   
   Danielle “Nella” Mesa 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great People! Built To Last!!!
  
 
      Posted on Google  
   
   tim marrs 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fortress is one of the most professional and responsive contractors that we have ever worked for. We are a civil contractor (Marrs Construction) and have worked for Fortress on many projects. I highly recommend them!!
  
 
      Posted on Google  
   
   Tiffany Brown 
 
 
 
 Trustindex verifies that the original source of the review is Google. Love this company

— Common Questions

What Homeowners Often Ask About ADUs

Do I need a large lot to qualify for an ADU?
Most Maricopa County cities allow ADUs on lots 6,000 sq ft and larger. On a 7–8,000 sq ft lot, you’ll typically have comfortable room for a detached unit. We’ll assess your property during a free consultation.

How long does the full build take?

Typically 4–7 months from contract to certificate of occupancy, including permitting. Surprise, Peoria, and Phoenix are generally efficient — and we know the local permitting process well.

Do you handle all the permits?

Completely. Fortress manages drawings, city submittals, all inspections, and the final certificate of occupancy. You don’t have to deal with city offices at all.

Can I use it as a rental — short or long term?

In most Phoenix-area cities, yes. ADU rental rules vary by municipality, but many of our clients use their ADU to offset their mortgage or generate passive income. We’ll help point you toward the right resources.

What’s included in the starting price?

Standard finishes, foundation, framing, roofing, electrical, plumbing, HVAC, and complete interior finish-out are included. Upgrades, site prep, and utility connections are scoped and quoted clearly before you sign anything.

Can I customize the design to match my home?

Absolutely. The three plans are a starting point. We can adjust layouts, add covered patios, change exterior finishes, and tailor the architecture to complement your existing home.

Ready To See What's Possible in Your Backyard?

No pressure. Just a straightforward conversation about your property, your goals, and your budget.

Or call our team directly: (480) 736-3951

Fortress Residential GCI · Fortress General Contracting, Inc.
Tempe, Arizona · Serving the Greater Phoenix Metro Area
AZ ROC 250565 · Licensed, Bonded & Insured · fortressresidentialgci.com

Prices shown are starting estimates and subject to site conditions, design selections, and permitting requirements. Contact us for a detailed project quote.
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