Maricopa County, Arizona
Maricopa County Residential Design & Permit Information
This page covers residential permitting and design planning for properties located in unincorporated areas of Maricopa County, where jurisdiction checks, rural-lot conditions, utilities, drainage, and site access often shape the project before drawings begin.
How This Page Helps
What to Know About Building in Maricopa County
Projects in unincorporated Maricopa County often involve properties outside city limits, where site conditions and utilities play a larger role in the design process. These properties may rely on septic systems, wells, private utilities, long driveways, private roads, washes, floodplain considerations, or drainage conditions that need to be verified before planning begins. The first question is often jurisdiction itself: some addresses that feel rural may still be inside a city, while others are governed by county review. Confirming zoning, setbacks, floodplain or drainage requirements, access, and site-specific constraints early helps prevent delays during plan review and construction.
Common Project Types
- Custom homes in unincorporated areas
- Additions and remodels
- Detached structures and RV garages
- Rural and large-lot development
- As-built documentation
Before You Start
Information that helps move a project forward
It is critical to confirm whether the property is within city limits or unincorporated county. That jurisdiction check determines which permit path, forms, code references, review process, and site requirements apply.
- Confirm whether the property is in a city or unincorporated county
- Project scope, parcel information, and rough building placement
- Known septic, well, private utility, access, drainage, or floodplain constraints
- Any available survey, site plan, existing plans, photos, or field documentation
Current Code Adoption
Current Maricopa County code references
Maricopa County follows the 2021 code cycle, including the 2021 IRC, 2021 IBC, 2021 IMC, 2021 IPC, 2021 IECC, and the 2020 NEC, with county amendments.
- 2021 IRC
- 2021 IBC
- 2021 IMC
- 2021 IPC
- 2021 IECC
- 2020 NEC
- County amendments apply
Process Overview
How unincorporated Maricopa County residential projects typically move through review
Maricopa County uses a digital plan review process. Projects are reviewed for building code compliance, zoning, drainage, and site conditions, so clear site information and accurate scope definition matter before the plan package is submitted.
Online Portal
Maricopa County uses its online permitting system for plan submittals, permit tracking, and inspections.
Related Services
Services that often connect to Maricopa County projects
County projects often begin either with a new design path, such as a custom home, detached structure, RV garage, shop, casita, or rural lot development, or with existing-condition documentation where as-built drawings help clarify scope before county review. Site planning is especially important when septic, wells, drainage, floodplain, access, or unincorporated-county jurisdiction questions affect where and how the project can be built.
Custom Homes
Permit-ready plans for new residential projects built around the lot and the way the home needs to function.
Remodels & Additions
Plans for additions, remodels, and changes to existing homes that need accurate existing-condition coordination.
Detached Structures
Design support for detached garages, RV garages, shops, casitas, and accessory structures.
As-Built Services
Useful when accurate existing-condition drawings are needed before planning a remodel, addition, or permit correction path.
Contact Residential Design
Planning a Project in Maricopa County?
Tell us about the property, the project type, and whether it is within city limits or unincorporated county. Whether you are planning a custom home, remodel, addition, RV garage, shop, casita, or need existing-condition drawings, starting with accurate jurisdiction and site information helps avoid major delays and surprises.