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San Jose, CA Noise from Specific Sources: Generator Noise (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Adjustment provision
SJMC § 20.100.500(A)(12)
Residential property-line limit
55 dBA
Commercial property-line limit
60 dBA
Underlying standard
SJMC § 20.40.600(B)(2), Table 20-105
Process
Director decision, no hearing

Summary

San Jose lets the planning director approve a generator already covered by a development permit through an administrative adjustment, no new permit, no hearing, if it meets citywide performance standards for noise and air pollution.

A.The director may, at the director's sole discretion, approve an adjustment for the following elements of a previously-issued development permit, subject to and in accordance with the provisions of this section:1.General Extensions...12.Generators meeting performance standards for noise and air pollution.

Source: SJMC Title 10 NoiseView official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 5 Update 3).

Full Breakdown

Under San Jose Municipal Code § 20.100.500(A)(12), a generator already covered by a development permit can get an administrative adjustment, no public hearing, no new permit, if it meets performance standards for noise and air pollution. The noise benchmark those standards point to sits in the commercial-district performance rules at § 20.40.600(B)(2): sound from any use, including a generator, can't exceed 55 dBA at a property line abutting residential property, or 60 dBA next to commercial property, without a special use permit. The director's adjustment decision is final and requires no hearing.

Violations & Fines

Running a generator loud enough to bust the 55/60 dBA property-line limit without a special use permit is a zoning violation the director can deny, condition, or revoke: plus it forfeits the adjustment shortcut, forcing a full development-permit review.

Frequently Asked Questions

Does San Jose cap generator noise in decibels?
Not with a generator-specific number. Generators fall under the citywide commercial performance standard: 55 dBA at a residential property line, 60 dBA at a commercial one, under SJMC § 20.40.600(B)(2).
Do I need a new permit to run a backup generator in San Jose?
If it's already covered by a development permit and meets the noise and air-pollution performance standards, the director can approve it as an administrative adjustment under § 20.100.500(A)(12) instead of a new permit.

Sources & Official References

Other rules in San Jose

Bar & Nightclub NoiseSome RestrictionsNoise Ordinances: Aircraft NoiseSignificant RestrictionsParking Rules: Curb Color RulesSome RestrictionsParking Rules: Preferential Parking DistrictsSignificant RestrictionsParking Rules: Driveway RulesSome RestrictionsParking Rules: Commercial & Oversized VehiclesSignificant RestrictionsFence Regulations: Fence Permit RequirementsSome Restrictions

All San Jose rules

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