Sunnyside: permit history and electrical signals

Sunnyside by the numbers

Among the 12 neighborhoods in this hub, Sunnyside ranks 2nd for permit activity per home since 2022, 1st for panel and service upgrades per home (4.7 per 100 homes with a build year), and 12th for the share of pre-1974 housing.

Counts are City of Tucson GIS permit layers 85 (residential), 81 (commercial) and 102 (code enforcement) inside the neighborhood boundary, issued or opened on or after 1 January 2022 — the window those layers cover. Older permits exist in the City’s Property Research Online file and show up in the per-address report. Build years are the assessor’s published values, which stop at 2009. “Per 100 homes” divides by homes with a published build year; the comparison figure uses the same measure summed over the City’s 140 registered neighborhoods, not every parcel in the city.

When Sunnyside was built

• Before 19502%
• 1950–196435%
• 1965–197330%
• 1974–198923%
• 1990–19952%
• 1996–20077%
• 2008 or later1%

Highlighted bands are the eras that carry a known wiring or panel issue in Tucson housing.

Post-war services and ungrounded circuits

About 35% went up between 1950 and 1964 — Tucson's post-war boom. Services from those years were 60 to 100 amps, often a fuse panel since swapped for breakers without the service itself ever being enlarged. Grounded branch circuits did not become the norm until the early 1960s, and the cloth jacket on that era's cable embrittles in a Tucson attic. That is the 8th-largest share of the 12 neighborhoods in this hub.

Aluminum branch-circuit wiring

Roughly 30% went up between 1965 and 1973 — the window when solid aluminum was used for 15 and 20 amp branch circuits. The wire itself is not the problem; the terminations are, and the accepted repairs are COPALUM crimps or AlumiConn connectors. A wire nut is not a repair. That is the largest share of the 12 neighborhoods in this hub.

Federal Pacific and Zinsco panels

About 23% of the stock dates to 1974–1989, when Federal Pacific Stab-Lok and Zinsco/Sylvania panels were still being installed. Both have documented failure-to-trip histories in the breaker-to-bus connection itself, so a new breaker does not resolve it — the panel is what gets replaced once you need to add a circuit. That is the largest share of the 12 neighborhoods in this hub.

Permit activity by year

Recent permits worth noticing in Sunnyside

• solar2026-08-10 · TC-RES-0726-03966 — PV Solar installation
• remodel2026-07-20 · TC-RES-0625-02831 — ADU
• remodel2026-07-15 · TC-RES-0526-02565 — Renovate SFR
• panel2026-07-13 · TC-RES-0726-03772 — Main electrical panel upgrade from a 100 amp service to a 200 amp
• remodel2026-07-13 · TC-RES-0626-03225 — ADU
• hvac2026-07-06 · TC-RES-0626-03095 — *URGENT/EMERGENCY NEED* Customer elected to have HVAC system replaced as opposed to repairing existing system. Replac
• hvac2026-07-06 · TC-RES-0626-03506 — *URGENT/EMERGENCY NEED* Customer elected to have HVAC system replaced as opposed to repairing existing system. Replace
• remodel2026-06-29 · TC-RES-0626-02933 — Additional Dwelling Unit/Guesthouse

Permit number, date, type and the City’s own description — nothing else. Each links to the official record.

Example property reports in Sunnyside

Real parcels in the neighborhood with a permit history deep enough to read. Each opens the full report.

• 701 W Calle Ramona — built 1990, 35 permits on record
• 6340 S Santa Clara Av — built 1982, 33 permits on record
• 5975 S 12th Av — built 2008, 38 permits on record
• 5740 S Nogales Hy — built 1935, 14 permits on record

Look up an address in Sunnyside

Any address in Pima County works. You get the parcel, the year built, the full permit history (City file back to about 2006), the code cases, and what each system’s record implies — plus an AI read of the whole record and of the plan sheets behind a City permit.