Choosing the right floor plan is one of the most important decisions when building an Accessory Dwelling Unit (ADU). A well-designed layout can maximize your property’s potential, improve daily living, and make a small footprint feel spacious and flexible.
At PlanHAUS, we’ve developed a collection of layouts designed specifically for Arizona homeowners—plans that balance comfort, efficiency, and style. While our full plan collection will launch soon, here’s a preview of five ADU types that work beautifully for a wide range of living needs.
1. Studio Efficiency ADU
A compact 400–450 square foot studio can offer everything you need for a comfortable guest suite, rental unit, or downsized living space. Studios prioritize an open-concept layout, combining sleeping, living, and dining into a flexible area that feels larger than the square footage suggests.
Design Tips:
- Use built-in cabinetry to maximize storage without crowding the space.
- An open kitchen and living area creates an airy, connected feel.
- Consider adding a small private patio or courtyard to extend usable living space outdoors.
2. One-Bedroom ADU
Ranging from about 500–650 square feet, a one-bedroom ADU adds privacy and separation between living and sleeping spaces, making it ideal for aging parents, adult children, or long-term guests.
What to Focus On:
- Decide what matters most: Does the resident need a larger living area for gatherings, or is bedroom space a bigger priority?
- Smart design can tuck a washer and dryer into a walk-in closet to save floor space.
- Open kitchen and living layouts create a welcoming, flexible core to the home.
3. Two-Bedroom Compact ADU
Perfect for families or shared rental units, a two-bedroom ADU (around 700–850 square feet) can support multiple living arrangements while maintaining a sense of privacy and comfort.
Design Priorities:
- Efficient circulation: minimize hallway space so square footage goes toward livable rooms.
- Integrated storage: use cabinetry walls or dual-use furniture.
- Outdoor transitions: access to patios or yards expands the feel of the home dramatically.
4. Garage Conversion Model
Turning an existing garage into an ADU is often the most cost-effective path for homeowners. A typical 20×20 or 24×24 garage can be transformed into a cozy 400–500 square foot living space with thoughtful upgrades.
Key Considerations:
- Insulation and foundation retrofitting are crucial to meet modern building codes.
- Open kitchen/living areas can make garage footprints feel fresh and inviting.
- Clever storage solutions, like cabinetry walls and combined utility spaces, maximize functionality without sacrificing style.
5. Shipping Container ADU
Using shipping containers to create modular ADUs offers a creative, fast-track approach to building. Typically ranging from 320–640 square feet, container homes can be configured singly or combined for expanded layouts.
Advantages:
- Strong, durable steel frame construction.
- Flexible stacking or side-by-side arrangements for expansion later.
- Opportunities for modern industrial design blended with warm, livable interiors.
Designing for How You Live
When planning your ADU, think beyond square footage. Focus on how the space will be used:
- If you’re housing a smaller household member, consider whether living space or bedroom space matters more to their comfort.
- Look for opportunities to combine utility functions—for example, placing a washer and dryer inside a walk-in closet.
- Use cabinetry walls to double as storage and pantry space, keeping everyday living simple and organized.
- Embrace open kitchen and living layouts to make smaller interiors feel expansive and connected.
A well-designed ADU doesn’t feel like a tiny house—it feels like a full home, just smarter.
Not Sure Which Path is Right for You?
If you’re comparing stock plans, pre-designed options, or full custom services—we can help you weigh the pros and cons. We’ll take a look at your lot, your goals, and your city’s requirements to help you find the best-fit solution.
