Guest House & ADU Essentials: Building Casitas in Phoenix under New Laws
Guest houses, also known as accessory dwelling units (ADUs) or casitas, have grown increasingly popular in Phoenix and other Arizona cities. Recent laws have opened the door to more ADU construction by allowing homeowners to build a small secondary dwelling on their property. In this guide we’ll explain what the new regulations mean, why you might want to add a casita to your property, and how to design and build one that complements your main home.
Understanding Arizona’s new ADU laws
Arizona municipalities historically restricted accessory dwellings, but recent policy changes in Phoenix and some surrounding areas have created a path for casitas. Ordinances now generally allow one accessory dwelling per single-family lot, with size limits based on the lot size (many jurisdictions cap ADUs at around 1,000 square feet). The structure must be subordinate to the main residence and meet setbacks, height limits and parking requirements. Always check your city’s planning department for the latest rules before starting your project. Working with an experienced builder can help you navigate permit processes and zoning restrictions.
Why build a guest house or casita?
A thoughtfully designed guest house offers many benefits:
Multi-generational living: Aging parents or adult children can live independently while staying close to family. A casita allows privacy while maintaining connection.
Rental income: Some homeowners rent out their ADU as a short-term vacation rental or long-term lease, generating supplemental income. Always check local laws and regulations about short term rentals.
Flex space: Use a casita as a home office, art studio, gym or private retreat. A separate space can boost productivity and creativity.
Increased property value: A high-quality accessory dwelling can make your home more desirable and broaden the market when you eventually sell.
Hospitality: Provide comfortable accommodations for guests without sacrificing your own space.
Planning considerations
Before you break ground on a guest house, consider these practical factors:
Zoning and permits: Work with local planners to confirm ADUs are allowed on your lot. Submit permit applications with site plans, elevations and building specifications.
Site placement: Position the casita to optimize privacy, views and access. Many homeowners locate it toward the rear of the property or near a side yard to create a private courtyard.
Utilities: Plan for water, sewer, electrical and gas connections. In many cases you can tie into existing service lines; in some situations you may need upgrades.
Parking: Cities often require an additional parking space for an ADU. Think about where guests or tenants will park without disrupting your daily routine.
Outdoor space: Integrate outdoor living features like patios or gardens to make the casita feel like a destination rather than an afterthought.
Design and style tips
An accessory dwelling should complement the architecture of the main home while maintaining its own identity. Here are some design suggestions:
Architectural harmony: Match or reference rooflines, materials and colors of your primary residence to create a cohesive look.
Energy efficiency: Use high-performance windows, proper insulation and passive solar design to reduce heating and cooling costs. Overhangs, shading and efficient HVAC systems will keep the space comfortable year-round.
Flexible layout: Design the floor plan to suit multiple uses. Consider an open living area with a kitchenette, a bedroom and a full bathroom. Movable partitions can add adaptability.
Natural light: Incorporate large windows, skylights and glass doors to bring daylight into the interior. This makes small spaces feel larger and more welcoming.
Landscaping: Soften the connection between structures with desert-friendly landscaping. Native plants like palo verde, saguaro and agave complement the Arizona aesthetic and require little water.
Partner with a trusted builder
Because ADUs are relatively new in many Arizona neighborhoods, it’s essential to work with a builder who understands the local codes and knows how to optimize small spaces. Jematell Homes has experience designing and constructing custom homes and casitas in the Phoenix metro area. We stay current with municipal ordinances and collaborate with homeowners to create accessory dwellings that enhance property value and lifestyle.
If you’re considering adding a guest house to your property, reach out to our team for a consultation. We’ll guide you through zoning, design and construction, ensuring your casita blends seamlessly with your home while delivering the functionality you need.