Permit Review Detail
Review Status: Requires Resubmit
Review Details: RESIDENTIAL ADU v.1
Permit Number - TC-RES-0326-01422
Review Name: RESIDENTIAL ADU v.1
Review Status: Requires Resubmit
| Review Date | Reviewer's Name | Type of Review | Description | Status | Comments |
|---|---|---|---|---|---|
| 03/26/2026 | Residential Engineering | NOT REQUIRED | |||
| 04/08/2026 | Bldg Permits - Post Review Express | PENDING ASSIGNMENT | |||
| 03/25/2026 | Addressing Validation | REQUIRES RESUBMIT | For questions: PDSD-Permits@tucsonaz.gov The permit and plan show to be for an Accessory Dwelling Unit (ADU) and requires to be separately addressed. Please contact Pima County Addressing at addressing@pima.gov or 520-724-9512 to assign/add the units or a new address for this ADU. Please resubmit your plans and all supporting permit documents to reflect the updated address, in addition, a change of address request will need to be submitted in order to properly update the location of this permit. Instructions can be found here to request change of address: https://www.tucsonaz.gov/files/sharedassets/public/v/2/pdsd/documents/tdc-faq/new-pdfs/sub-records.pdf |
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| 03/26/2026 | Residential Building | REQUIRES RESUBMIT | TC-RES-0326-01422 PLAN REVIEW COMMENTS Plan review for the above referenced structure has been completed. This letter reflects comments to be addressed. For facilitating a shorter back check time, please provide updated plans and calculations with a written response to each of the notated items indicating action taken. Do not cloud the changes made for comment updates; revisions are processed if changes occur after the permit is issued. SCOPE OF REVIEW: The scope of this plan review covers architectural, plumbing, mechanical, energy conservation and electrical. All code references are to the 2024 International Residential Code. All features were checked only to the extent allowed by the submittals provided. All portions of this project are assumed to meet or will meet other departmental requirements, conditions, and concerns before permit approval. GENERAL REQUIREMENTS: The City of Tucson adopted the 2024 IRC with amendments and building ordinances for all dwellings. Place the reference code on the plans. All engineers and architects involved in the design of the structure are to seal the related sheets of plans, details, and calculations in accordance with the rules of the State Board of Technical Registration. Place the registrant seal on the plans or remove the “architect” title form the plans. Provide a separate response letter addressing each comment with location of change on the plans. GENERAL COMMENTS: https://www.tucsonaz.gov/Departments/Planning-Development-Services/Codes/Building-Codes 1. An ADU is a dwelling unit requiring separation for safe functionality from the primary dwelling. The dwellings require a fire rated wall and separate utility connections. 2. Show compliance with the Inclusive Home Design Ordinance adopted by the City of Tucson Ordinance #10463 on 10/16/2007. Notate accessible route, minimum door width, changes in floor elevation, door hardware, electrical outlet reach range, grab bar reinforcement, etc. PLANS: 1. Notate a cool (white) roof finish (greater than 60 SRI) as required by the ADU provisions. 2. Show a maximum ½” floor elevation changes at a notated accessible route entrance on the floor plan, R106.1.1. Include all threshold conditions for a route from the exterior into the living space. 3. Individual dwelling units require separation with a 1-hour fire-resistance rated assembly without openings, R302.3. Provide a detail or notation showing compliance with Table 721.1(2) of the 2024 IBC. 4. Provide a minimum 6 mil polyethylene vapor retarder with joints lapped not less than 6 inches between the concrete floor slab and the base course or the prepared subgrade where a base course does not exist, R506.3.3. SECTIONS - DETAILS: 1. Show one-hour fire-resistive framed construction separating dwellings in compliance with IBC Table 721.1(2). 2. Show exterior wood siding, sheathing, water-resistive barrier and wall framing with a 6” clearance above the ground (R317.1 item 5). Update detail #1/A-1. MECHANICAL PLANS: 1. Show an independent HVAC system size for the dwelling demand in accordance with M1401.3, M1601.1. 2. Provide demand calculations in accordance with Manual J standards, M1401.3, M1601.1. 3. Provide (an HVAC system with fresh air intake) whole-house mechanical ventilation with controlled exhaust, R303.4; N1103.6 & M1505.4. Identify the device model number providing an adjustable setting and note the minimum continuous setting. A one-bedroom dwelling under 1501 SF requires a 30 CFM continuous setting. PLUMBING PLANS: 1. The 2024 I-codes are adopted by the City of Tucson. Remove the UPC reference from note #2. 2. The Tucson Water Department limits flow rates for the water meter size in compliance with P2903.7. Show an appropriate yard pipe size with connection between the existing dwelling and the meter. 3. Show an individual accessible water supply shut off and water heater for the proposed dwelling unit, P2903.9.1. 4. Show the water heater rating/capacity for consistence with the electrical circuit size, R106.1.1. ELECTRICAL PLANS: 1. Provide a Riser Diagram showing independent service disconnects for both the primary and ADU dwelling, E3403. Show the ADU feeder size (minimum 100 Amp) and appropriate breaker requirement, E3602.1 & E3603.1. 2. Provide a minimum service conductor rating of #3 copper 75 degree C for the 100 AMP feeder, E3602.1 & E3603.1. 3. Show a surge-protective device (SPD) as an integral part of or placed immediately adjacent to the service equipment, E3606.5. 4. Designate the circuit number at the location of each light fixture, receptacle, appliance, and equipment disconnect switch, R106.1.1. 5. Show locations of each smoke alarm, R310. 6. Show two or more 2O AMP small appliance circuits at the kitchen countertop receptacle outlets; they may also serve the breakfast room and dining room, but not other locations, E3703.2 and E3901.3. 7. Show the Bathroom receptacle with a separate 20 AMP dedicated circuit, E3703.4 and E3901.6. 8. Provide GFCI protection for appliance receptacle outlets, E3902.12. Include the washer/dryer, range and microwave. OUTDOOR LIGHTING CODE 1. Show the proposed exterior fixtures as full cut-off (FCO) style for eliminating the need for an Outdoor Lighting Calculation when processing the site plan permit. INTERNATIONAL ENERGY CONSERVATION CODE: 1. Energy Certificate: (Mandatory) place near the indoor furnace or in utility room, N1101.14. Add notation to plans. If you have any questions, please contact: Kenneth.VanKarsen@tucsonaz.gov City of Tucson Residential Building Safety |
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| 04/08/2026 | Residential Zoning | REQUIRES RESUBMIT | PDSD TRANSMITTAL FROM: Roxanne Johnston Planner PROJECT: TC-RES-0326-01422 4749 E Towner St., Tucson, AZ 85712 ADU Addition (1st Review) TRANSMITTAL DATE: 04/08/2026 This site is located within the R-1 zone (UDC 4.7.8). A single-family residence is a permitted use in this zone (Table 4.8-2) subject to Use Specific Standards 4.9.7.B.5 - .9. RESUBMITTAL OF THE FOLLOWING IS REQUIRED: Correct plans, as noted in the comments below, along with a response letter indicating how all Site Zoning comments were addressed. 1. Please label the attached ADU and supply a unit number/address label as requested in the PDSD Permits comment from 3/25/2026. 2. Additional comments may be forthcoming depending on responses to zoning review comments and plans submitted for the next review. The City of Tucson Unified Development Code may be accessed at this site: https://codelibrary.amlegal.com/codes/tucson/latest/tucson_az_udc/0-0-0-1 Recent amendments to the UDC may be found here: https://tucsonaz.hylandcloud.com/221agendaonline/Documents/ViewDocument/ORDINANCE%2012219.pdf?meetingId=1890&documentType=Agenda&itemId=77068&publishId=189435&isSection=false If you have any questions about this transmittal, please contact Roxanne Johnston at roxanne.johnston@tucsonaz.gov |
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| 03/25/2026 | PDSD Application Completeness Express | REVIEW COMPLETED |