Ernest Ongaro & Sons Inc — building and trade permits in Marin County, CA

At a glance

First permit on record

2016-07-13

Most recent permit

2026-10-29

Years with filings

11 (2016–2026)

Busiest year

2021 · 256 permits

Main category

Mechanical / HVAC · 58.3%

Distinct addresses

1,472

Median declared value

$4,900

How Ernest Ongaro & Sons Inc compares in Marin County

In 2025, Ernest Ongaro & Sons Inc filed 119 mechanical (HVAC) permits in Marin County — 1st of 92 companies named on mechanical (HVAC) permits that year. Across all records since 2016, it ranks 1st of 290 with 1,179 mechanical (HVAC) permits.

Ranked by the number of permits in the company's main category, among every company named on such permits in Marin County records — not only those with a page here. Companies with equal counts share a place. Filing volume measures activity, not quality.

Latest building and trade permits

The 5 most recent filings; the full list is further down.

Licences on record

A contractor commonly holds several licences, one per class of work, so more than one number is normal. The number is reproduced as Marin County published it. A licence appearing on a permit does not prove it is current: check status and expiry with the issuing authority before acting.

Permit categories

3 categories, as classified by the issuing authority. Small categories stay visible rather than being rounded away.

Activity by year

Busiest year on record: 2021, with 256 permits. One project can account for several filings, so read this as filing activity rather than workload.

Where they worked

1,472 distinct addresses on record; the 14 most recent are shown. Declared value on record runs from $1 to $60,000, median $4,900. Addresses appear as the authority published them. A permit is a filing at an address, not a completed job there.

Also named on permits at the same addresses

Companies that also appear in Marin County permit records at addresses where Ernest Ongaro & Sons Inc filed, in any year. Sharing an address is a documented co-appearance, not proof that they worked on the same project or with each other.

Building and trade permits on record

Fields appear as the issuing authority published them, including spelling and blanks. Scope text is the applicant's description of intended work, not an inspection finding.

Other mechanical (HVAC) contractors in Marin County

Companies whose main permit category in Marin County is also mechanical (HVAC), closest to Ernest Ongaro & Sons Inc in filing volume. Listed for comparison, not as a recommendation.

Questions about Ernest Ongaro & Sons Inc

What permits has Ernest Ongaro & Sons Inc filed in Marin County?

2,016 building and trade permits on record from 2016 through 2026, most often mechanical / hvac (58.3% of the record).

When did Ernest Ongaro & Sons Inc last file a permit in Marin County?

The most recent permit on record was issued 2026-10-29: plumbing at 68 SEMINARY COVE DR, MILL VALLEY, CA 94941.

Where does Ernest Ongaro & Sons Inc work?

1,472 distinct Marin County addresses appear on its permits.

Is Ernest Ongaro & Sons Inc licensed?

Its permits list licence number 215233.0. A licence on a permit shows it was on file that day, not that it is current — check with the issuing authority.

Search these records

The 2,016 permits above are a static record through 2026. Select a year above to open that year’s records, or search Ernest Ongaro & Sons Inc in Marin County, CA by address, trade or date range.

Source and limits

Public Marin County building and trade permits from the County of Marin through 2026, counted by distinct permit number. This is a historical filing record: it cannot show current backlog, pricing, crew availability, licensing or insurance, and a quiet period may only mean work was filed elsewhere. Confirm anything commercial with the company and with the issuing authority before acting. How we build these records, and what we withhold →

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