Building permits in unincorporated Navajo County are issued under the county's adopted codes and its own addenda and additions. The county runs from the Mogollon Rim to the Utah border, and much of its land area lies within sovereign tribal jurisdictions rather than county authority.
This guide covers what requires a permit in unincorporated Navajo County, the adopted codes and the county addenda that sit over them, the published lists of licensed professionals the county maintains by trade, the environmental and septic requirements on rural parcels, and the tribal-land structure that determines jurisdiction.
This guide covers unincorporated Navajo County. Tribal lands and the county's incorporated towns are separate authorities.
Navajo County is not the Navajo Nation. They share a name and overlapping territory and are entirely different governments. The county permits construction in its unincorporated areas; the Navajo Nation, the Hopi Tribe and the White Mountain Apache Tribe are sovereign governments with authority over their own lands, which cover much of the county. Establishing the land status of the parcel is the first question here.
What requires a permit in Navajo County?
Navajo County issues building permits and conducts inspections in the unincorporated areas of the county under its adopted codes and its own addenda and additions. The county runs a long, narrow jurisdiction from the Mogollon Rim country in the south to the Utah border in the north, and the character of construction changes completely along that length.
The county's adopted building code information lists the 2018 International Residential Code and the 2018 International Building Code, together with Navajo County Addenda and Additions. One detail stands out and is worth flagging to a designer: the county separately references an earlier residential code stair building provision, which means the stair requirements applied here may not be those of the 2018 text. Confirm the stair provisions specifically rather than assuming the base edition governs them.
A great deal of Navajo County is not county jurisdiction. The Navajo Nation and the Hopi Reservation occupy the northern portion of the county, and the Fort Apache Reservation occupies much of the south. Tribal land is sovereign and sits outside county building authority, as neighbouring Arizona counties state in their own adopting ordinances — excluding state and federal lands including reservations, absent an intergovernmental agreement for building code enforcement. Establishing the land status of a parcel is the first question here, not a formality.
The county publishes its environmental quality material alongside its building material, pointing to the state administrative code provisions that govern on-site wastewater, together with septic outreach resources and a questions and answers packet. On rural parcels in this county the septic system and the building permit are part of the same conversation.
Permit required
- New residential and commercial construction, additions and alterations
- Structural work, relocation and demolition in the unincorporated county
- Manufactured home installation and set-up
- Septic and on-site wastewater systems
- Utility connections, under the county's utilities permit application
- Solar photovoltaic systems and battery storage
- Electrical, plumbing, gas and mechanical work
- Work requiring soil testing or engineered design under the county addenda
Typically exempt
- Work on tribal land, which is outside county building jurisdiction
- Purely cosmetic finish work that alters no regulated system
- Like-for-like minor repairs not affecting structure or a system
- Routine maintenance that does not extend or reroute a system
Navajo County building department: who handles permitting
The most distinctive thing Navajo County publishes is a set of licensed professional lists organised by category: drafters, engineers and land surveyors, mobile home setters, wastewater-certified contractors, septic system contractors, and soil testing firms. In a rural county where the nearest qualified professional may be a long drive away, that list is a practical service rather than a courtesy.
Those categories also tell you what the county expects a project to involve. Mobile home setters and septic system contractors appearing as named categories reflects the housing stock; soil testing firms appearing reflects that engineered foundation design is a routine requirement here rather than an exception. If your project touches any of those, the county has already told you it expects a qualified specialist.
Short on time to read all of this?
Get a free quote →Environmental quality sits alongside building in the county's published material, with reference to the state administrative code title governing on-site wastewater and to septic outreach resources. The county also publishes installation inspection guidelines and a questions and answers packet, which together are the fastest orientation available for someone building on a rural parcel here for the first time.
| Detail | Information |
|---|---|
| Authority | Navajo County, unincorporated areas only |
| Adopted codes | The 2018 residential and building codes |
| County-specific | Navajo County Addenda and Additions, applying over the model codes |
| Stair provisions | An earlier residential code stair provision is separately referenced |
| Published lists | Drafters, engineers and surveyors, mobile home setters |
| More published lists | Wastewater-certified and septic system contractors, soil testing firms |
| Environmental | On-site wastewater under the state administrative code provisions |
| Published guidance | Installation inspection guidelines and a questions and answers packet |
| Tribal land | Navajo Nation, Hopi and Fort Apache lands are outside county jurisdiction |
| Contractor licence | Arizona Registrar of Contractors (ROC) |
Use the county's published professional lists. Navajo County maintains lists of licensed professionals by category — drafters, engineers and land surveyors, mobile home setters, wastewater-certified contractors, septic system contractors and soil testing firms. In a rural county that is not a directory for its own sake: it tells you which specialists the county expects a project to involve, and it saves you finding out at review that your foundation design needed a soil test from a firm the county recognises.
Navajo County is not the Navajo Nation. They share a name and overlapping territory, and they are entirely different governments. The county permits construction in its unincorporated areas; the Navajo Nation is a sovereign tribal government with its own authority over its own lands, as are the Hopi Tribe and the White Mountain Apache Tribe whose lands also lie within the county’s boundaries. The incorporated towns — Holbrook, Pinetop-Lakeside, Show Low, Snowflake, Taylor and Winslow — run their own municipal arrangements again; unincorporated communities such as Heber-Overgaard are permitted by the county.
In 2025, building permits issued in unincorporated Navajo County authorized 194 new privately owned housing units, 190 of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
Navajo County permits: record types and what each covers
The record catalog here is conventional, but the supporting professional requirements are what shape a Navajo County project in practice.
Not sure this scope needs a permit?
Get a free quote →Residential permit types
| Permit type | What triggers it | Review path | Fee basis |
|---|---|---|---|
| New construction | New dwellings, additions, and accessory structures above the local size threshold | Plan review against the jurisdiction's adopted residential code and local amendments, plus zoning and setbacks | Valuation-based |
| Addition | Added conditioned or unconditioned space attached to an existing dwelling | Structural and energy review where the jurisdiction has adopted an energy code; most Arizona homes are in hot, dry climate zones, so envelope and equipment sizing draw attention | Valuation-based |
| Renovation / alteration | Structural changes, layout changes, or added plumbing, mechanical, or electrical | Plan review scaled to scope; a change that alters egress, structure, or a system is reviewed even where the footprint does not move | Valuation-based |
| Reroof | Roof covering replacement, recover, and structural deck repair | Deck and dry-in inspection; plan review rarely required, but a change of assembly type can trigger a structural check | Valuation or squares |
| Solar photovoltaic | Rooftop or ground-mount arrays, with or without battery storage | Single local review covering both the structural attachment and the electrical scope; there is no separate state electrical record in Arizona | Flat or system-size based |
| Battery energy storage | Wall or floor-mounted storage added to a dwelling | Electrical review plus fire separation, ventilation, and location check | Flat or per-permit minimum |
| Electrical | Service changes, panel upgrades, new circuits, EV chargers, meter sets, and rewiring | Local trade review and local inspection against the National Electrical Code edition the jurisdiction has adopted | Per-permit or per-device |
| Plumbing | New piping, repipes, fixtures, gas piping, and water heater replacement | Local trade review; performed by a contractor holding the matching Registrar of Contractors specialty classification | Per-permit minimum or per-fixture |
| Mechanical / HVAC | Changeouts, new ductwork, and refrigeration | Local trade review; changeout volume is heavy in Arizona given summer design temperatures | Per-permit minimum or per-unit |
| Patio cover and shade structure | Attached and detached covers, ramadas, and carports | Structural review for wind uplift and attachment, plus zoning for setbacks and lot coverage | Valuation or flat |
| Swimming pool | In-ground and above-ground pools and spas | Barrier, bonding, and electrical review; the local pool barrier rules apply, and Arizona’s state barrier law covers places with no local barrier ordinance | Valuation or flat |
| Manufactured home set-up | Placing or re-siting a manufactured or modular home | Installation permit and inspection through the Arizona Department of Housing’s Office of Manufactured Housing, or the local agency acting for it, with local zoning, setback, floodplain and utility connection review | Flat or per-unit |
| Demolition | Full or partial demolition of a dwelling or accessory structure | Utility disconnect confirmation, dust control where earthmoving is involved, and site restoration check | Flat |
| Manufactured home permit | Installation and set-up on a private parcel | Using a setter from the county's published list, under state standards | Per the county's adopted fee provisions |
| Soil testing report | Parcels where engineered foundation design is required | From a firm on the county's published soil testing list | A design cost borne by the applicant |
Rather talk it over?
Call 1-855-478-4290 →Commercial permit types
| Permit type | What triggers it | Review path | Fee basis |
|---|---|---|---|
| New commercial construction | Ground-up commercial, industrial, and institutional buildings | Concurrent review against the jurisdiction's adopted building code and amendments, plus fire and zoning | Valuation-based |
| Tenant improvement / upfit | Interior fit-out of an existing tenant space | Building, trade, and life-safety review; accessibility attaches on change of use | Valuation-based |
| Change of occupancy | Converting a building or space to a different use group | Occupancy classification, egress, and accessibility review | Valuation or flat |
| Commercial electrical | Service, distribution, and branch circuit work | Local trade review and local inspection; Arizona has no central state electrical permit for either residential or commercial work | Per-permit or valuation |
| Commercial plumbing | Process piping, fixtures, backflow, and grease waste | Local trade review; backflow and grease interceptor sign-off where applicable | Per-fixture or valuation |
| Commercial mechanical | Rooftop units, kitchen exhaust and hood systems, and refrigeration | Local trade review; hood and suppression systems draw fire review alongside mechanical | Per-unit or valuation |
| Commercial reroof | Roof covering replacement on a commercial structure | Deck, dry-in, and attachment inspection | Valuation or squares |
| Signage | Wall, ground, and illuminated signs | Zoning review for size and placement, plus electrical where illuminated | Flat or per-sign |
| Grading and drainage | Clearing, grading, and site work that alters drainage | Civil review of grading and drainage, separate from the building permit; monsoon-season flows drive the design | Acreage or valuation |
| Dust control permit | Earthmoving, trenching, and construction dust on a qualifying site | County air quality department, not the building department; required under the county’s dust (PM-10) rules, which are strictest in the Phoenix-area PM-10 nonattainment area | County air quality fee schedule |
| Commercial demolition | Full or partial demolition of a commercial structure | Utility disconnect, asbestos notification, dust control, and site restoration | Flat or valuation |
| Utilities permit | Utility connections and related work | Filed on the county's published utilities permit application | Per the county's adopted fee provisions |
| Engineered design submittal | Where the county addenda or site conditions require it | Prepared by an engineer from the county's published list | A design cost borne by the applicant |
Residential
- Building and trade permits are issued and inspected by the same local authority
- There is no separate state electrical permit — electrical is a local record
- Work that needs a permit must be done by a Registrar of Contractors licensee, at any job value, unless the owner is doing it under the owner-builder exemption
- A new or changed septic system needs approval from ADEQ, or the county agency acting for it, before it is installed
Commercial — multi-discipline
- Concurrent review across building, trades, fire, and zoning
- Signed and sealed plans from Arizona-registered design professionals, apart from the small buildings and alterations state law exempts
- The licensee's classification must match the actual scope of work
- Accessibility and life-safety review attach to any change of occupancy
Records you will actually see in Navajo
| Record | What it covers |
|---|---|
| Building permit | Construction and alteration in the unincorporated county |
| Trade permit | Electrical, plumbing, gas and mechanical by the ROC-licensed contractor |
| Manufactured home permit | Installation and set-up, using a listed mobile home setter |
| Septic permit | On-site wastewater under the state administrative code provisions |
| Utilities permit | Filed on the county's published utilities permit application |
| Solar photovoltaic permit | Arrays, inverters and battery storage |
| Soil testing report | From a firm on the county's published list, where required |
| Engineered design submittal | Where the county addenda or site conditions call for it |
| Installation inspection | Under the county's published installation inspection guidelines |
Rather not deal with the Navajo County building department?
Get a free quote →Solar permits in Navajo
Solar in unincorporated Navajo County is permitted and inspected by the county under its adopted codes and the county addenda, which apply over the model text. Confirm the electrical edition adopted alongside the 2018 building and residential codes. At Navajo County elevations — the Rim country in the south, the plateau in the north — snow and wind loading on an array are genuine structural questions rather than formalities. On tribal land none of this applies: the tribe's own authority governs.
Roofing permits in Navajo
Reroofing follows the ordinary sequence with the deck and dry-in inspected before the covering goes on. Design conditions here are high-elevation rather than desert across most of the county, so snow load and freeze-thaw govern rather than heat and ultraviolet exposure. Check the county addenda alongside the model codes — the county separately references an earlier residential code stair provision, which is a reminder that its adopted position is a set of specific choices rather than a single edition.
Arizona solar and roofing work is permitted and inspected locally, against the code edition each jurisdiction has adopted; utilities run interconnection on their own timeline. Arizona rules
Navajo County permit cost
Permit fees are assessed under the county's adopted fee provisions, with building fees driven by valuation and plan review assessed alongside. Trade permits are charged per discipline, and the septic and environmental scopes are assessed separately.
The costs worth anticipating in this county are professional rather than administrative. The county's own published professional categories — engineers and land surveyors, soil testing firms, septic system contractors, mobile home setters — indicate where a rural project here typically needs specialist input. Engineered foundation design following a soil test is a common requirement rather than an unusual one, and it is a design cost incurred well before the permit fee.
| Fee component | How it works |
|---|---|
| Building permit fee | Under the county's adopted fee provisions |
| Plan review | Assessed alongside the building permit |
| Trade permits | Electrical, plumbing, gas and mechanical charged per discipline |
| Septic and wastewater | Assessed separately under the environmental provisions |
| Soil testing | A design cost, from a firm on the county's published list |
| Engineered design | Where the addenda or site conditions require it |
| Manufactured home set-up | Assessed on its own basis |
Want a precise number for a specific Navajo project? Send us the scope and we will price the permit path before you file.
Navajo County trade permits
The trades are permitted and inspected by the county under the adopted codes and the county addenda. Arizona has no state electrical permit, so nothing is filed with the state alongside.
Electrical permits
Required for service work, panel changes, photovoltaic systems, electric vehicle chargers and most wiring alterations. Confirm the electrical code edition adopted alongside the 2018 building and residential codes, and read the county addenda, which apply over the model text.
Plumbing permits
Required for new piping, repipes, fixtures and water heaters. On rural parcels the plumbing scope connects to an on-site wastewater system governed by the state administrative code provisions, and the county publishes lists of both septic system contractors and wastewater-certified contractors.
Mechanical permits
Required for heating, ventilation and air-conditioning work, ductwork and refrigeration. Navajo County runs from the high Rim country to the northern plateau, so heating load dominates across most of it — the opposite of the low-desert assumption.
Manufactured housing
A major category in this county, and one the county has built its published professional lists around. Mobile home setters appear as their own listed category, and installation is reviewed against the state manufactured housing installation standards alongside the county's installation inspection guidelines.
Want this handled start to finish?
Get a free quote →Arizona licenses contractors through the state Registrar of Contractors, and the small-job exemption never covers work that needs a permit. Arizona rules
Navajo County permit application: how to apply step by step
Here is how to get a building permit in Navajo County, from confirming the requirement through to close-out. Each step below corresponds to a real decision point where projects commonly stall.
Navajo Nation, Hopi and Fort Apache lands cover much of this county and are outside county building jurisdiction. Municipalities permit their own work. Settle which authority applies before anything else.
The county lists the 2018 residential and building codes with its own addenda and additions, and separately references an earlier stair provision. Read the addenda alongside the model text.
Use the published lists for drafters, engineers and land surveyors, mobile home setters, septic system contractors, wastewater-certified contractors and soil testing firms.
On-site wastewater is governed by the state administrative code provisions and the county publishes septic outreach material. On a rural parcel this is part of the same project, not a later errand.
The county publishes them alongside its permit material, and they set out what an inspection will actually be looking for — particularly on manufactured housing.
Work the inspection sequence with the permit and approved plans on site, and clear the septic and any engineered-design conditions alongside the building items.
Inspections in Navajo County
Inspections follow the ordinary sequence against the adopted codes and the county addenda, with the county publishing installation inspection guidelines that set out what is being checked. On manufactured housing in particular those guidelines are the working document rather than the general code.
The geography of this county shapes inspection scheduling more than any rule does. Navajo County runs several hours north to south with sparse population at both ends, so inspector travel is a real constraint. Give as much notice as the county asks, have the work genuinely ready, and keep the permit and approved plans where they can be found on site.
Winter is a genuine seasonal constraint across most of the county. The Rim country and the northern plateau both get real winter weather, and site access, concrete placement and roofing are all affected in ways a Phoenix programme would not anticipate. Build weather contingency into the inspection sequence rather than adding it once the schedule has already slipped.
Close-out follows the ordinary sequence to the occupancy certificate. On a rural parcel the septic approval and any engineered-design conditions need clearing alongside the building items, so identify them at submittal rather than at final inspection.
Navajo County permit search and official resources
These are the primary Navajo County and Arizona sources behind this guide. The county publishes its addenda separately from the model codes, so read both.
Inspections are where schedules slip.
Get a free quote →- Navajo County building information
- Arizona Registrar of Contractors
- Arizona Department of Environmental Quality
- Arizona Department of Housing, manufactured housing
- Arizona Department of Water Resources
- International Code Council
- Arizona Board of Technical Registration
Frequently asked questions
Does Navajo County permit work on the Navajo Nation?
No. The Navajo Nation is a sovereign tribal government with its own authority over its own lands, as are the Hopi Tribe and the White Mountain Apache Tribe whose lands also lie within the county's boundaries. County building authority extends to the unincorporated areas of the county outside those lands.
Is Navajo County the same as the Navajo Nation?
No, despite the shared name and overlapping territory. Navajo County is a unit of Arizona county government; the Navajo Nation is a sovereign tribal government. They are different authorities with different jurisdictions, and confusing them is the single most common error made about this county.
Which codes does Navajo County enforce?
The county's published building code information lists the 2018 International Residential Code and the 2018 International Building Code, together with Navajo County Addenda and Additions. Read the addenda alongside the model text, because they apply over it.
Are the stair requirements the same as the 2018 code?
Not necessarily. The county separately references an earlier residential code stair building provision alongside its 2018 adoptions, so the stair requirements applied here may not be those of the 2018 text. Confirm the stair provisions specifically with the county rather than assuming the base edition governs them.
Does the county recommend professionals?
It publishes lists by category: drafters, engineers and land surveyors, mobile home setters, wastewater-certified contractors, septic system contractors and soil testing firms. The lists also signal which specialists the county expects a rural project to involve.
Who handles septic systems?
On-site wastewater is governed by the state administrative code provisions, and the county publishes environmental quality material alongside its building material, including septic outreach resources and a questions and answers packet. On rural parcels the septic system and the building permit belong to the same conversation.
Do I need a soil test?
Often, on rural parcels here. The county publishes a list of soil testing firms as one of its named professional categories, which is a reasonable indication that engineered foundation design following a soil test is a routine requirement in this county rather than an exception.
Do the state accessory dwelling unit rules apply here?
Yes, since 2026. A 2025 law (A.R.S. 11-810.01) requires every Arizona county to allow at least one attached and one detached accessory dwelling unit as a permitted use on any lot where a single-family dwelling is allowed, with county regulations due by 1 January 2026. It does not apply on tribal land or near military and some public airports. The detail is in the county’s zoning provisions, so check them before you design.
Which towns permit their own work?
The six incorporated places — Holbrook, Pinetop-Lakeside, Show Low, Snowflake, Taylor and Winslow — run their own municipal arrangements. The county permits the unincorporated remainder outside tribal land, including communities such as Heber-Overgaard that have no town government.
Does weather affect the programme?
Yes, materially. Navajo County runs from the high Rim country to the northern plateau and gets real winter weather across most of its area. Site access, concrete placement and roofing are all seasonal here in a way they are not in the low desert.
What about manufactured housing?
It is a major category in this county, and the county has built published guidance around it — mobile home setters appear as their own listed professional category, and the county publishes installation inspection guidelines alongside the state manufactured housing installation standards.
Do I need a licensed contractor?
Usually. Arizona requires a Registrar of Contractors licence for work of $1,000 or more, labour and materials combined, and for any work that needs a building permit (A.R.S. 32-1121). An owner working on their own property, not for sale or rent, is exempt even where a permit is needed. The licence is a state licence valid statewide.
Simplify Navajo County permitting with Alliance Permitting
Navajo County is a long, rural, high-elevation jurisdiction where most of the land is outside county authority and where the county tells you, through its published professional lists, exactly which specialists a project needs. Alliance Permitting prepares, files and tracks Navajo County permits through issuance.
Trusted by leading builders, developers, and national contractors — 21+ years of filing in the jurisdictions we write about.
Contractors and builders choose Alliance for Navajo because the work is done by people who have stood at the counter:
- We settle the land status first, since tribal land covers much of this county.
- We work from the county addenda as well as the model codes, including the stair provisions.
- We line up the specialists from the county's own published lists before submittal.
- We treat the septic approval as part of the building project rather than a later errand.
Alliance Permitting is a permit documentation and expediting service in Arizona. We are not a law firm and do not provide legal advice, and we are not the permitting authority.
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More Arizona permitting guides
This guide is provided by Alliance Permitting for general information about Navajo County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.