Horizon Line · Slab-on-grade
Studio
A compact, efficient footprint — perfect as a guest suite or rental.
- Area
- 572 sq ft
- Layout
- Studio · 1 Bath
- Footprint
- 22′-6″ × 28′-6″
Now legal statewide · Arizona HB 2928Build Your ADU.
Build Your ADU.
See It On Your Lot First.
Use our Site Configuration Tool to instantly check your property, explore floor plans, and understand what's possible under Arizona's HB 2928 law.
- Models
- 5
- Sizes
- 572–997 sf
- Legal in
- All AZ
Preview any model on a real lot — setbacks and placement included.
Featured Models
Four plans. One simple system.
Every Horizon Line model is pre-designed and to scale — pick a starting point, then make it yours in the configuration tool. And every plan can be mirrored or flipped to suit your lot; the mirrored 1-Bed below is just an example of that.
Horizon Line · Slab-on-grade
1-Bed
A true one-bedroom with a defined living space and full kitchen.
- Area
- 630 sq ft
- Layout
- 1 Bed · 1 Bath
- Footprint
- 34′-6″ × 20′-6″
Horizon Line · Slab-on-grade
2-Bed / 1-Bath
Two bedrooms with a shared bath — great for family or a small household.
- Area
- 815 sq ft
- Layout
- 2 Beds · 1 Bath
- Footprint
- 36′-6″ × 24′-6″
Horizon Line · Slab-on-grade
2-Bed / 2-Bath
Our largest layout — two full suites for maximum flexibility.
- Area
- 997 sq ft
- Layout
- 2 Beds · 2 Baths
- Footprint
- 24′-6″ × 44′-6″
Mirrored exampleHorizon Line · Slab-on-grade
1-Bed — Mirrored
Every Horizon Line plan can be mirrored or flipped — this 1-Bed is our example, with the entry and layout flipped to the opposite side.
- Area
- 630 sq ft
- Layout
- 1 Bed · 1 Bath
- Footprint
- 34′-6″ × 20′-6″
The Opportunity
Arizona changed the rules. Your backyard just got more valuable.
Arizona's HB 2928 makes accessory dwelling units (ADU's) legal on single-family lots across the state. In plain terms: most homeowners can now add a second, self-contained home in their backyard — a guest house, rental, or space for family.
Create reliable income
Add a rentable unit to your property and turn unused backyard space into monthly cash flow.
Use your home's equity
Put the equity you already have to work by building an asset that adds value to your lot.
Offset your mortgage
Rental income from an ADU can help cover your mortgage and everyday costs of ownership.
Now legal across Arizona
Arizona HB 2928 opened the door to ADU's on single-family lots statewide — the timing has never been better.
How It Works
From address to action in four simple steps
Step 1: Check Your Lot
Enter your address and instantly see your property with real setbacks drawn to scale.
Step 2: Choose Your Model
Pick from our pre-designed Horizon Line floor plans, sized from studio to two bedrooms.
Step 3: Place & Customize
Drag and position your ADU on your lot to see exactly how it fits before committing.
Step 4: Get Next Steps
Review your configuration and move toward permitting with a clear, confident plan.
The Digital Tool
Know what's possible before you spend a dollar.
Most people start an ADU project with a phone call and a lot of uncertainty. Our Site Configuration Tool flips that around: see your setbacks, place a model, and understand your options in minutes. It's the modern, low-risk way to explore an ADU.
Try the toolSee real setbacks
The tool pulls your actual lot and draws the buildable area — no guesswork about what will fit.
Visualize placement first
Position a to-scale model on your property and understand the outcome before talking to anyone.
Low-risk exploration
Explore models, sizes, and placement on your own time. No pressure, no sales call required to start.
Why Horizon Line
Built for speed, cost, and confidence.
The Horizon Line isn't just a set of plans — it's a system designed to make high-quality ADU building accessible, repeatable, and trustworthy across Arizona.
- Pre-approved plan strategy
- Starting from proven, pre-designed plans means a faster path and lower cost than a one-off custom design.
- A transparent process
- Clear steps, real dimensions, and honest expectations — you always know what comes next.
- Partnered with Copperstate Truss
- Factory-engineered truss packages from a trusted Arizona manufacturer add credibility, quality, and savings.
- A long-term vision
- We are building toward affordable, repeatable ADU construction that helps families and communities thrive.
Start configuring your ADU today.
Check your lot, explore the models, and see your ADU in place — all in a few minutes, right from your browser.
At a home show? Come see the physical models at our booth, then scan to pick up right where you left off.
Start configuring at guestadu.com