Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
All ADUs in Tempe require a building permit. However, Tempe's zoning code was significantly reformed in 2023 to allow ADUs by-right in most residential zones, which streamlined approval—but the permit itself is mandatory and the approval process depends on lot size, zoning, and whether you already own the home.
Tempe stands apart from many Arizona cities (and from its own pre-2023 code) because the city adopted an ADU-friendly ordinance that makes ADUs a permitted use (not a conditional use or variance case) in most residential zones—R1, R2, R3, and mixed-use zones. This is UNIQUE: many Arizona suburbs still require conditional-use permits or variances for ADUs, which adds 2–4 weeks and attorney costs. In Tempe, if your lot and unit meet the development standards (setbacks, height, parking if required), you file a standard building permit and move forward. But the permit is not waived. The Tempe Planning & Zoning Department must review compliance with the 2023 ADU standards (lot size minimums, unit size caps, owner-occupancy rules that vary by unit type) before the Building Department issues a permit. Tempe also has no state-level ADU law override like California does; Arizona Revised Statutes (ARS § 32-1121) allow owner-builder involvement, but Tempe's local code governs zoning and development standards. Timeline is typically 8–14 weeks, not the 60-day shot clock you'd see in California. Fees run $5,000–$12,000 all-in (plan review, permit, impact fees).

What happens if you skip the permit (and you needed one)

Tempe ADU permits — the key details

Tempe's 2023 ADU ordinance fundamentally changed what is and is not allowed. Before 2023, ADUs were conditional uses in most zones, requiring a public hearing and Planning & Zoning approval. Now, ADUs (including junior ADUs, detached ADUs, garage conversions, and above-garage units) are permitted uses in R1 (single-family), R2 (duplex), R3 (multi-family), and certain mixed-use zones. This matters because it eliminates the hearing step and reduces the approval path to a straight zoning/planning-level document review (4–6 weeks) plus a standard building-permit review (2–4 weeks). The catch: your lot and proposed unit must meet the development standards. Detached ADUs on R1 lots require a minimum lot size (typically 6,500–8,000 sq ft, depending on configuration). Garage conversions and junior ADUs have fewer setback constraints. Above-garage ADUs must be structurally attached to the primary dwelling. If your lot is too small or the unit design violates setbacks, parking, or height limits, the city will deny the zoning clearance before the Building Department even opens the file. The bottom line: Tempe's code is permissive, but it's not a free-for-all. Get a pre-submission meeting with Planning & Zoning to confirm your project qualifies before spending money on design and engineering.

Owner-occupancy and rental eligibility rules are city-specific. Tempe's ordinance permits ADUs as long-term rentals (you do not have to owner-occupy the primary home). This is different from some Arizona cities and Arizona's pre-2023 Tempe rules, which required the property owner to occupy one unit. However, if you rent out the ADU, you must comply with Tempe's rental-licensing ordinance and fair-housing rules. Furnishing an ADU (temporary rental to tourists) may violate zoning; Tempe distinguishes between long-term residential leases (permitted) and short-term vacation rentals (typically not in residential zones, and subject to separate licensing). If your intent is Airbnb, ask the city directly—they are stricter on short-term rentals than long-term leases. Deed restrictions and covenants on your property may also prohibit ADUs or require HOA approval; check your title report and HOA documents before you permit. The city permits the ADU, but the HOA may still block you.

Utility connections and meter requirements depend on unit type. Detached ADUs and above-garage units are subject to IRC R310 egress rules (every habitable room must have a way out in case of fire, and bedrooms require min 5.7 sq ft window or equivalent egress door). If the ADU has a separate kitchen (sink, stove, refrigerator), it is a 'dwelling unit' and triggers full building-code requirements: separate meter(s) for electric, water, and sewer, or a sub-meter system that allows utility-company billing separation. Garage conversions that become ADUs must have the garage door sealed and replaced with windows/solid wall (IRC R310.1). If you are converting a garage to a junior ADU (no bedroom, kitchenette), some utility separation rules may relax, but you'll still need a separate entrance and meter for water/sewer if it has a sink. Tempe's Building Department will require utility-company sign-off (SRP for electric, City of Tempe Water Services for water/sewer) before final sign-off. Do not assume your existing lot infrastructure (water line, sewer, electric service panel) can handle the load; request a pre-application meeting with each utility. Adding a second meter may cost $2,000–$5,000 and require trenching/easement work.

Setback, height, and lot-coverage rules are tighter for detached ADUs than for attached conversions. A detached ADU on an R1 lot in Tempe must maintain 5–10 feet from the rear and side property lines (depending on neighborhood and zoning overlay), and cannot exceed 35 feet in height (or 4 stories in dense zones). Setbacks from the primary dwelling also apply (typically 10–15 feet). If your lot is small (less than 6,500 sq ft) or irregular, a detached ADU may not fit. Garage conversions and junior ADUs avoid most setback constraints because they are attached to the existing structure. Above-garage units must be structurally integral to the primary roof line and cannot overhang the lot line. If your proposed ADU unit is 800 sq ft or larger, and sits on a small lot, plan-review staff may flag lot-coverage violations (total impervious surface and building footprint limits). Parking is also required for detached ADUs (typically one space per unit in Tempe), though the code allows on-street, tandem, or carport spaces to count. Garage conversions do not eliminate parking obligations. Getting a surveyor's lot plan with setback/height annotations is not optional—it's step one of pre-design.

Timeline and fees reflect Tempe's improved efficiency but are still longer than a straight building permit. Once you submit a complete ADU zoning-clearance request with site plan, unit floor plan, and elevations, Planning & Zoning staff will do a 2–3 week completeness review and issue a list of deficiencies (if any). After you respond, staff does a 2–3 week substantive review and either approves or denies the zoning clearance. Only after zoning approval can you file the building permit with the Building Department. The building-permit review (plan-review phase) typically takes 2–4 weeks, with a round or two of corrections. Inspections (foundation, framing, rough trades, insulation, final) are spread over 2–4 months once construction starts. Total elapsed time: 10–16 weeks from zoning application to building-permit issuance, plus construction time. Fees: Tempe charges a zoning-clearance fee ($500–$800), a building-permit fee (1.5–2% of valuation, typically $2,000–$6,000 for a $200K ADU), and impact fees (school, water, street, typically $1,500–$3,000). Some ADUs qualify for fee waivers if owner-built and owner-occupied of the primary home; confirm with the city. Total hard permit/fee cost: $5,000–$12,000. Expedite options (same-day plan review) exist for an additional $500–$1,500 and are worth it if you are buying a property and want certainty before closing.

Three Tempe accessory dwelling unit (adu) scenarios

Scenario A
Detached 600 sq ft ADU on a 7,500 sq ft R1 lot in central Tempe (new construction)
You own a 7,500 sq ft lot in an established central Tempe neighborhood (close to Arizona State University). The lot is rectangular, 75 feet wide and 100 feet deep. Your primary home is a 1,200 sq ft 1960s ranch on the front half. You want to build a detached 600 sq ft, one-bedroom ADU on the back half. The detached footprint is 20 feet by 30 feet, with a small covered porch. Under Tempe's 2023 code, this is a permitted use in R1 zoning. Setbacks: rear setback 10 feet (your lot is 100 feet deep, primary home is ~50 feet from street, so you have ~50 feet left; minus 10-foot rear setback and 5-foot separation from the main house, you have plenty of room). Height: 16 feet to peak (single story, roof slope), well under the 35-foot limit. Parking: one space in a carport alongside the unit (carport spaces count). Your lot drainage is critical in Phoenix/Tempe: caliche (hardpan) sits ~18 inches below grade. Your builder will need to core the caliche for foundation footings and ensure perimeter drainage is graded away from the structure. The Building Department will require a geotechnical report if the home is over two stories or has structural settlement concerns; a 600 sq ft single-story detached ADU typically does not, but a drainage report is standard. Utilities: You need a second electric meter (SRP service call, ~$1,500) and a separate water/sewer meter from the City of Tempe (trench to the main in the street, ~$3,000–$5,000). Sewer capacity may be limited if your lot drains into an aging residential line; ask the city's development-review team. Building permit fees: ~$2,000 (1.5% of $140K estimated valuation). Zoning-clearance fee: $650. Impact fees: ~$2,000 (schools, water, street). Total permit cost: ~$4,650. Inspection sequence: foundation (excavation, footing holes), framing (before drywall), rough electrical/plumbing/HVAC, insulation/drywall, final interior, electrical rough-in sign-off, plumbing rough-in sign-off, and final building inspection. Plan review and zoning clearance: 8–10 weeks. Construction: 4–6 months. Total timeline: 6–9 months from submittal to CO.
Permitted use (no variance) | 600 sq ft one-bed detached | Separate electric and water meters ($4,500–$5,500) | Geotechnical report likely not required | Caliche-drilling cost $1,000–$2,000 | Zoning clearance $650 | Building permit $2,000 | Impact fees ~$2,000 | Total hard cost (permits + utilities): $10,000–$12,000
Scenario B
Garage conversion to junior ADU (kitchenette, no bedroom) in Tempe R1, existing 2-car garage
Your primary home is a 1,950 sq ft two-bedroom, one-bathroom house on a 6,200 sq ft R1 lot in south Tempe. You have a detached two-car garage (400 sq ft) built in the 1980s, positioned 12 feet from the rear property line and 5 feet from the side. You want to convert it into a junior ADU: remove the garage doors, install French doors and a window for egress (IRC R310), add a kitchenette (sink and mini-fridge, no stove), a full bathroom, and living/sleeping space. Total ADU footprint: 350 sq ft. Under Tempe's 2023 code, a junior ADU (no bedroom, kitchenette) is a permitted use with fewer restrictions than a full ADU. Key difference: junior ADUs are exempt from some setback increases that apply to full detached ADUs, because they are smaller and have fewer occupancy impacts. However, you still need egress (R310.1 requires min 5.7 sq ft window or egress door in habitable room; your kitchenette/living space counts as habitable, so two windows or one window + door is required). The existing garage already sits within the setbacks, so no setback variance needed. But utility separation is trickier: since this is a kitchenette (sink), Tempe will likely require a separate water meter (or sub-meter) and separate sewer line. Electric can go to a sub-panel tied to your main service, but the city's Building Department may ask for a sub-meter so the ADU tenant pays their own water/sewer bill. Trench cost for sewer separation: $2,000–$4,000 (if the main sewer is close). Water line: $1,500–$2,500. Sub-panel: $500–$1,000. The conversion itself (roof, interior, HVAC, plumbing, electrical inside the garage): $40,000–$60,000. Building permit: ~$1,200 (1.5% of $80K estimated valuation). Zoning clearance: $550 (junior ADUs often have a lower fee because they're smaller). Impact fees: ~$1,500. Total permit cost: ~$3,250. The plan-review phase is typically faster for conversions than new construction (4–6 weeks instead of 6–8 weeks) because the structure exists; the city is checking code compliance, not new design. Inspections: framing (interior reconfiguration), rough plumbing/electrical, insulation, drywall, final, and utility sign-off. Timeline: 6–8 weeks for permits, 3–4 months for construction. Total: 5–6 months from submittal to CO.
Junior ADU permitted use | Kitchenette (separate water/sewer required) | No bedroom (smaller impact fee) | Existing garage (no foundation cost) | Egress window + door required (IRC R310) | Utility separation $4,000–$7,000 | Interior conversion $40,000–$60,000 | Zoning clearance $550 | Building permit $1,200 | Impact fees ~$1,500 | Total permit + utility: $7,250–$8,250
Scenario C
Above-garage ADU (350 sq ft, one-bed, rental intent) on R3 mixed-use lot in Tempe near downtown
You are an investor who bought a 0.35-acre R3-zoned lot in central Tempe, close to downtown, with a 1,200 sq ft primary single-family home (original 1970s structure) and a detached one-car garage. The lot is 50 feet wide and 300+ feet deep (narrow and long, typical of older Tempe subdivisions near the ASU campus and light-rail). You plan to add a 350 sq ft one-bedroom ADU above the existing garage. The new second-story sits on the garage roof, cantilevered slightly but structurally supported by posts anchored to new footings at the garage corners. The garage itself will be converted to open carport-style parking (posts only, no walls), which counts as one parking space toward the ADU requirement. The above-garage unit has a private exterior staircase and an interior egress window meeting IRC R310. Under Tempe's 2023 code, above-garage ADUs in R3 zoning are permitted uses. R3 is more permissive than R1, so setback and height constraints are looser. Your above-garage unit must be structurally integral (cannot cantilever beyond the garage footprint by more than 2–3 feet per local interpretation). A surveyor's site plan will confirm this. Structural engineer's design of the new roof-framing system (to support the second-story ADU weight) is required; cost $2,000–$4,000. Foundation: the new posts/footings must anchor into bedrock or caliche if within 3 feet of surface. Caliche drilling and footing design: $1,500–$2,500. Utilities: a separate electric meter (SRP service, $1,500) and a sub-meter for water/sewer (the city often accepts shared sewer for above-garage units if the primary home's sewer is adequately sized; a plumber and the city must verify). Electrical sub-panel: $500–$800. Building permit valuation: ~$140K (structural, mechanical, electrical for a second story). Permit fee: ~$2,100 (1.5% of valuation). Zoning clearance: $650. Impact fees (R3 lots may have lower rates or waivers depending on pre-existing density): ~$1,500–$2,000. Total hard permit cost: ~$4,250–$4,750. Rental licensing: once you rent the unit, Tempe requires a rental-license application (separate from building permit, ~$200–$300, annual renewal $150–$200). Plan-review timeline: 6–8 weeks (structural plans add review time; the city engineering staff must sign off on the post-and-foundation design). Construction timeline: 4–6 months. Total: 5–7 months from zoning clearance to CO. The structural engineer's involvement adds cost and time versus a simple detached ADU, but the R3 zoning and rental intent are compliant.
Permitted use in R3 (mixed-use) | Above-garage, structurally attached | One-bed, 350 sq ft, rental intent | Structural engineer design required ($2,000–$4,000) | Caliche-core footings ($1,500–$2,500) | Separate electric meter + sub-panel ($2,000–$2,300) | Water sub-meter or shared sewer (verify with city) | Zoning clearance $650 | Building permit $2,100 | Impact fees $1,500–$2,000 | Rental license $250–$350 | Total hard permit + professional: $11,000–$13,600

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Tempe's 2023 ADU code reform and why it matters

In 2023, Tempe overhauled its ADU ordinance in response to state-level advocacy and local housing-affordability pressure (Arizona State University students and young professionals were being priced out). The old code (pre-2023) required ADUs to go through a conditional-use permit (CUP) process, which meant a Planning & Zoning Commission hearing, public notice, neighbor objections, and a 4–8 week approval timeline. The new code made ADUs a permitted use in R1, R2, R3, and mixed-use zones, eliminating the public hearing. This single change cut 4 weeks off approval timelines and reduced attorney/consultant costs by 30–50% for many projects. However, Tempe's reform is narrower than California's SB 9 or Oregon's statewide ADU law. Arizona has no state-level ADU preemption statute that overrides local zoning (unlike California Government Code 65852.2 or Oregon ORS 227.375). Tempe's local code is the ceiling and floor. If Tempe says ADUs are permitted but lot-size minimums are 6,500 sq ft, then 6,500 sq ft is the rule—the state does not override it. This is critical for investors comparing Tempe to California cities: Tempe is ADU-friendly by Arizona standards, but it is not California-level permissive.

The permitted-use status also means no variance path if you are under the lot-size minimum. In California, if SB 9 allows an ADU on your lot, you get it—no vote, no exception. In Tempe, if your R1 lot is 6,000 sq ft (below the 6,500 sq ft minimum for a detached ADU), you cannot simply apply for a variance and hope for approval. You have two options: (1) reclassify the project as a junior ADU (no bedroom, kitchenette), which has lower lot-size minimums and may fit; or (2) propose an above-garage or garage-conversion unit, which also has lower thresholds. Tempe's zoning staff are helpful and will work with you to find an alternate path, but the permitted-use framework does not include a variance escape hatch.

Owner-builder status and licensing requirements also differ from California. Under Arizona Revised Statutes § 32-1121, Arizona allows owner-builders to construct on their own property without a contractor's license, provided the owner is not acting as a contractor (i.e., not being paid to build it). In Tempe, you can self-perform work on your ADU and pull the permit in your own name, as long as you are not hiring yourself out as a contractor. However, some trades (electrical, plumbing, HVAC) still require a licensed contractor in Tempe, even for owner-builders. You can pull rough electrical and do rough plumbing, but the final sign-off and sub-panel/meter work must be done by a licensed electrician and plumber. This is different from some Arizona cities, which are more permissive. Confirm with Tempe's Building Department which trades require licensure before you plan to DIY.

Utilities, meters, and the Tempe water/sewer capacity squeeze

Tempe's water and sewer systems are under stress from growth and climate change. The city is in a hot-arid climate (climate zone 2B, some mountain areas 3B), with limited groundwater and increasing reliance on Colorado River water through the Central Arizona Project (CAP). Sewer lines in central Tempe, especially near downtown and the ASU campus, are aging and frequently at or near capacity during peak demand. When you apply for an ADU permit, the city's development-review team will pull a capacity-availability report for your lot's sewer line. If the line is at 85%+ capacity, the city may deny your permit or require you to fund a line-upgrade project (cost: $5,000–$50,000+ depending on the extent). This is rare but not unheard of. Ask the city upfront: is your lot's sewer line in a capacity-constrained zone? If yes, factor in potential upgrade costs and timeline delays. Water is less of an issue city-wide, but winter water-shortage concerns have led some cities in Arizona to impose ADU-water-use limits or require drought-resistant landscaping. Tempe does not currently mandate this, but it may in the next few years. Metering: any ADU with a separate kitchen (sink, stove, fridge) must have a separate water meter or sub-meter. Sub-metering typically costs $500–$1,500 (the city must approve the sub-meter design), plus a plumber's labor to install the valve and lines ($1,500–$2,500). A second full meter (new service line from the main) costs more ($3,000–$5,000) because it requires coordination with the city's water department and may require a street cut and trench. Most ADU projects opt for a sub-meter to save cost.

Electrical service is less constrained than water/sewer, but you still need to confirm your primary home's service capacity. A typical older Tempe home (1970s–1990s) has a 100-amp or 150-amp main service panel. A 350–600 sq ft ADU with air conditioning and electric water heating will draw 20–40 amps continuously. If your primary home is already running at 80%+ capacity, you may need to upgrade the main panel to 200 amps (cost: $3,000–$5,000). SRP (Salt River Project), Tempe's electric utility, will perform a load-capacity review at the time you apply for meter service. Ask SRP early: does my service panel have capacity for an ADU sub-panel, or do I need a main-panel upgrade? This can add $3,000–$5,000 to hard costs and 2–4 weeks to the timeline if SRP has backlogs.

Gas is optional but common in Tempe ADUs. If your ADU will have gas appliances (stove, water heater, or space heater), you need a gas meter and service line. Gas service in Tempe is provided by Southwest Gas Corporation (SWGas). A second meter and service line cost $1,500–$3,000 and typically take 1–2 weeks to install. Because Tempe is a hot climate, many ADU owners skip gas and use all-electric (electric resistance water heater, induction cooktop, mini-split heat pump). This simplifies permitting (no gas inspection) and may reduce long-term operating costs if you are on a time-of-use electric rate.

City of Tempe Building Department (Planning & Zoning for zoning clearance; Building Department for building permit)
Tempe City Hall, 3 South Hardy Drive, Tempe, AZ 85281 (confirm exact office location and hours with city website)
Phone: (480) 350-8100 (main city line; ask for Building Department or Planning & Zoning) | https://www.tempe.gov/government/permits-and-development (check for online ADU portal or zoning-clearance system)
Monday–Friday, 8:00 AM–5:00 PM (typical; verify on Tempe city website before visiting)

Common questions

What is the difference between a junior ADU and a full ADU in Tempe?

A junior ADU has no bedroom and a kitchenette (sink, no stove) and is typically under 400 sq ft. It requires fewer setbacks and has lower lot-size minimums. A full ADU has one or more bedrooms and a full kitchen (sink, stove, refrigerator) and is subject to full building-code requirements and tighter setback rules. Tempe's 2023 code favors junior ADUs on small lots because they have lower impact. If your lot is under 6,500 sq ft, a junior ADU is usually the path forward.

Do I need to own-occupy the primary home if I want to rent out the ADU?

No. Tempe's 2023 code does not require owner-occupancy of the primary dwelling. You can own the property and rent out both the primary home and the ADU as long-term rentals. However, you must comply with Tempe's rental-licensing ordinance and fair-housing rules. Short-term vacation rentals (Airbnb, VRBO) are not permitted in residential zones; confirm with the city if your intent is short-term.

Can I build a detached ADU if my R1 lot is only 5,500 sq ft?

Not under standard Tempe rules (6,500 sq ft minimum for detached ADUs in R1). Your options: (1) propose a junior ADU, which has a lower lot-size minimum (~4,500 sq ft); (2) convert your garage to an ADU; or (3) add an above-garage unit. Each has different setback and design rules. Talk to Tempe Planning & Zoning staff for a pre-application meeting to explore which fits your lot.

How long does it take to get an ADU permit in Tempe from start to finish?

Zoning clearance typically takes 6–8 weeks (completeness review + substantive review). Building-permit plan review takes 2–4 weeks. Total for permit approvals: 8–12 weeks. Construction timelines vary (3–6 months for new detached ADUs, 2–4 months for conversions). Total elapsed time from application to CO: 5–9 months. Expedited plan review (add $500–$1,500) can compress the review phase by 1–2 weeks.

What if my HOA or deed restrictions prohibit ADUs?

The city cannot override private deed restrictions or HOA rules. Even if Tempe permits your ADU, your HOA can still block it. Check your CC&Rs and HOA bylaws before investing in design. If the HOA prohibits ADUs, you will need to amend the restriction (usually requires 75%+ HOA vote) or find a different property. Tempe's planning staff cannot help with HOA enforcement, but an attorney can.

Do I need a separate entrance for my ADU?

Yes. All ADUs in Tempe must have a separate, direct exterior entrance. This is required by code for life-safety (egress) and is also part of Tempe's definition of an ADU as a separate dwelling unit. Garage conversions must have the original garage door sealed and replaced with a new entrance. Above-garage units require an exterior staircase or integrated entryway.

Will my homeowner's insurance cover an ADU, or do I need a separate policy?

Most homeowner's policies do not cover rental dwellings or commercial use. If you rent out the ADU, you will need a separate rental or landlord policy. Contact your insurer before you permit to confirm coverage limits. Insurance costs typically run $600–$1,200 per year for an ADU rental unit. Some insurers offer a multi-dwelling rider to your primary-home policy; shop around.

What happens if the city denies my zoning clearance for the ADU?

If staff deny your zoning clearance, you receive a written decision explaining the reason (e.g., setback violation, lot-size non-compliance, parking shortfall). You have the right to appeal to the Tempe Planning & Zoning Commission (30-day window). An appeal typically requires a hearing and attorney representation; cost $2,000–$5,000. Alternatively, you can redesign the project to address the deficiency and resubmit. Resubmission cost is a new zoning-clearance fee ($550–$650).

Is owner-builder allowed for ADUs in Tempe?

Yes, under Arizona law (ARS § 32-1121). You can pull the permit in your name and perform work yourself, provided you are not acting as a paid contractor. However, licensed trades (final electrical, plumbing, HVAC, gas) still require a licensed contractor in Tempe. You can do rough work (framing, some plumbing rough-in), but final hookups and sign-offs must be licensed. Confirm specific trade requirements with the Building Department before you start work.

What is the estimated total cost (permits + construction) for an ADU in Tempe?

Permits and fees: $5,000–$12,000 (zoning clearance, building permit, impact fees, utilities). Construction: $150,000–$350,000 depending on size, finishes, and lot conditions (new detached ADU is ~$250–$350/sq ft; garage conversion is ~$120–$180/sq ft). For a 500 sq ft new detached ADU: permits $7,000–$10,000 + construction $150,000–$175,000 = $157,000–$185,000 total. For a 350 sq ft garage conversion: permits $4,000–$6,000 + construction $50,000–$70,000 = $54,000–$76,000 total. Land, loan, and soft costs (design, engineering, project management) add another 20–30%.

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Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current accessory dwelling unit (adu) permit requirements with the City of Tempe Building Department before starting your project.

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