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Permit Number: TC-RES-0526-02663
Parcel: 117071410

Address:
647 S 4TH AV

Review Status: Requires Resubmit

Review Details: RESIDENTIAL ADD/ALT v.1

Permit Number - TC-RES-0526-02663
Review Name: RESIDENTIAL ADD/ALT v.1
Review Status: Requires Resubmit
Review Date Reviewer's Name Type of Review Description Status Comments
05/25/2026 Historic APPROVED This was reviewed as ADU under 528 E 4th Street. There was no address for the proposed ADU at the time of historic review. A new address of 645 N 2nd has been issued for the ADU with same TC-RES-03447 and SD-0725-00107. Same parcel with two addresses. Historic conditions have been met. Staff has reviewed the plans and meets historic conditions. Permits may be issued for new address.
Contact: Michael.Taku@tucsonaz.gov
05/20/2026 Residential Engineering NOT REQUIRED
05/28/2026 Bldg Permits - Post Review Express PENDING ASSIGNMENT
05/28/2026 Residential Building - Standard REQUIRES RESUBMIT TC-RES-0526-02663
PLAN REVIEW COMMENTS

Plan review for the above referenced structure has been completed. This letter reflects comments to be addressed. Provide a separate Comment Response Letter when submitting updated plans. Facilitate 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 revisions.

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 and 2018 International Energy Conservation Code. The 2024 International Energy Conservation Code takes effect July 1st. 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.

PROVIDE A COMPLETE PLAN SET showing all proposed alterations to the building with 2024 IRC code compliance.

Provide a separate response letter addressing each comment with location of change on the plans.

SITE PLAN:

1. Show the location of the electrical service panel, R106.1.1.

SECTIONS - DETAILS:

1. Clarify the placement of ceiling/roof insulation for determining the need for attic ventilation, R806. Attic space outside of the thermal barrier requires a ventilation calculation for showing the attic vent opening size using 1 to 150 of attic area in compliance with R806.2 and the unvented roof assembly requires an air-impermeable rigid insulation material with a minimum R-5 value applied correctly to either side of the roof sheathing, R806.5. Identify the ventilation requirements and insulation types for complying with the condensation control issues.

MECHANICAL PLANS:

1. Show the HVAC system size for the bedroom demand in accordance with M1401.3, M1601.1.

ELECTRICAL PLANS:

1. Designate the circuit number at the location of each light fixture, receptacle, appliance, and equipment disconnect switch, R106.1.1.
2. Show the Bathroom receptacle with a separate 20 AMP dedicated circuit, E3703.4 and E3901.6.
3. Show a switch-controlled light for the stairways, E3903.3.
4. Interior new or extended circuits serving bedroom outlet locations including receptacles, lights, and smoke detectors require combination type arc-fault circuit interrupters, E3902.16. Add notation to plans.

OUTDOOR LIGHTING CODE

1. Show a full cutoff fixture were located within 25 feet from the property line OLC 401.3.3.

If you have any questions, please contact:
Kenneth.VanKarsen@tucsonaz.gov
City of Tucson Residential Building Safety
05/21/2026 Residential Zoning REQUIRES RESUBMIT Zoning approval pending review/approval by Historic.
05/20/2026 PDSD Application Completeness Express REVIEW COMPLETED