Home / Communities / Sonoma County / Petaluma / West Petaluma

West Petaluma Homes: Historic Districts and Older Houses

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

West Petaluma is the older side of the City of Petaluma, on the west bank of the Petaluma River, mostly in ZIP code 94952. It holds the downtown historic commercial district and two locally designated residential historic districts, Oakhill-Brewster and “A” Street, where houses date back to the 1850s and 1860s. Farther west the streets climb toward the hills and Helen Putnam Regional Park, where the city meets open ranch land.

For buyers, the west side’s appeal and its paperwork come from the same source: age. Many houses are Victorian-era or early twentieth century, and exterior changes in the historic districts need city review. This guide covers the districts and their rules, the housing stock, the inspection items that come with older homes, flood and fire maps, transit, local taxes, and what sellers should prepare. For the city as a whole, see our Petaluma real estate guide.

West Petaluma homes for sale

West Petaluma market report

Where West Petaluma is, and who governs it

Locals divide Petaluma into a west side and an east side, with the river and downtown between them and Highway 101 running north to south east of downtown. The west side is incorporated city land, so the City of Petaluma handles planning, building permits and historic review.

At the western edge, some properties with a Petaluma mailing address sit outside city limits on unincorporated Sonoma County land. There the county sets the rules, the city transfer tax doesn’t apply, and a well and septic system are more likely. Check the property tax bill or the city limits map for any address near the edge. Across the river, our East Petaluma guide covers the post-war and newer subdivisions east of the freeway.

The historic districts

Petaluma has three historic districts, and two of them are residential. All three sit in or next to downtown, which is on the west side of the river.

District	Status and date	Location (city description)	Era of buildings	Guidelines
Oakhill-Brewster Historic District	Local district, adopted by the City Council in 1990 (Ordinance No. 1796 N.C.S.)	North and west of downtown	1850s through 1980s, in a wide range of styles	Oakhill-Brewster District Preservation Guidelines & Standards; architectural inventory held by staff
“A” Street Historic District	Local district, adopted in 1986 (Ordinance 1666 N.C.S.)	South and east of downtown	1860 to 1925, nearly all before 1925	District guidelines adopted with the district
Petaluma Historic Commercial District	National Register of Historic Places, 1995; design guidelines adopted 1999 (Ordinance No. 2097 N.C.S.)	Much of downtown, about 23 acres	Mid-1800s to the end of World War II; 96 contributing buildings	Commercial Historic District Design Guidelines, including sign standards

The city reports that it has surveyed more than 300 properties for potential historic significance. A house outside the three districts can still be a designated landmark or a surveyed resource, so ask Planning about any specific address.

Housing stock on the west side

The two residential districts give the clearest picture of the oldest housing. The “A” Street district holds homes, churches and apartments built mostly before 1925. Oakhill-Brewster spans more than a century of building, so a Victorian can sit a few doors from a mid-century or later house.

Outside the districts, the age and style of houses vary by street. Expect a mix of nineteenth-century homes, early twentieth-century cottages and bungalows, mid-century houses and some newer infill, with lot sizes that vary more than in a tract subdivision. Check the lot size, year built and permit history on each property rather than relying on the neighborhood’s reputation.

Zoning also varies parcel by parcel. Section 4.020 of Petaluma’s Implementing Zoning Ordinance sets up residential zones from Rural Residential (RR) through Residential 1 to Residential 5 (R1 to R5), along with Mobile Home, Commercial, Mixed Use, Open Space and Park, Civic Facility and Floodway zones and planned unit and planned community districts. The zone controls density, setbacks and allowed uses, so look up the parcel on the city’s zoning map or ask Planning rather than assuming it from the street.

Property types include detached single-family homes, small multi-unit buildings, and some condominiums and townhomes. Ask early whether a property has a second unit and whether it was permitted, because it affects financing, insurance and resale.

Historic district rules: what needs review

Petaluma’s rules are stricter than many buyers expect. Under Implementing Zoning Ordinance section 15.050, work on a designated landmark, or on any structure in a historic district, needs approval from the Historic and Cultural Preservation Committee.

What counts as an alteration. The code defines an exterior alteration as any change, including repair or replacement of damaged or worn materials. It lists finish materials, windows, doors, signs, awnings and paint color changes, plus landscaping, lighting and mechanical equipment.
Minor work. Work of a minor nature that doesn’t substantially change the building’s appearance, such as repainting in the same colors, gets administrative review and approval without public notice.
Paint color. A change of color is treated as a full alteration, not minor work.
Standards. The city’s preservation page says reviews check conformance with the district guidelines and the Secretary of the Interior’s Standards for the Treatment of Historic Properties.

The city’s own summary is direct: almost all exterior work in the districts requires some level of discretionary review. Before you write an offer on a house you plan to change, call the Planning Division (707-778-4470, or the counter at 11 English Street) and read the district guidelines.

Mills Act contracts

A Mills Act contract can lower property taxes on a qualifying historic home in exchange for preservation commitments, where a city offers one. We did not find a Mills Act program on Petaluma’s historic preservation page, so ask the city whether one is available. Our post on Mills Act contracts for historic homes explains how they work where offered.

Buying an older West Petaluma home: what to inspect

A general home inspection is the start, not the finish, on a house that may be well over a century old. Plan for specialist reports on the items below, and budget time for them in your contingency period.

Foundation and framing. Older foundations, past seismic retrofit work and any settlement. A structural engineer can review what the general inspector flags.
Electrical. Original wiring, undersized service and later add-ons. Insurers ask about wiring age.
Plumbing and sewer lateral. Galvanized supply lines and older clay or cast-iron sewer laterals; a camera inspection of the lateral is worth the cost.
Lead paint and asbestos. Homes built before 1978 come with the federal lead-based paint disclosure; see our lead-based paint disclosure guide.
Wood-destroying pests and dry rot, especially at porches, siding and windows.
Permits. Compare the house to the city’s permit file. Unpermitted additions or window replacements in a historic district can be costly to legalize.

Our post on historic homes near the Sonoma Plaza covers renovation budgeting for homes of a similar age. Diamond may refer you to partners we work with, such as inspectors and contractors; you’re free to choose any provider.

Flood and fire hazards

Flood

Petaluma’s mapped floodplain follows the Petaluma River, and the city says it has had five major floods since 1982. Floods can close low roads and affect underpasses, parking structures and basements. The city also warns that localized flooding can reach properties outside mapped flood zones.

Check any property on FEMA’s Flood Insurance Rate Map through the FEMA Flood Map Service Center, and ask your lender whether flood insurance will be required. Parcels near the river and its tributary creeks need the closest look, and an elevation certificate helps where one exists. Our guide to North Bay flood zones explains zone letters and insurance.

Fire

CAL FIRE released Petaluma’s updated Local Responsibility Area fire hazard severity zone maps on February 24, 2025, covering Moderate, High and Very High zones. The city links a 2025 viewer for both local and state responsibility areas. Look up the parcel, especially near the western hills and open space. A High or Very High zone triggers specific disclosures and, at sale, defensible space documentation; see our guides to North Bay fire hazard zones and AB 38 defensible space inspections.

Getting around and getting outside

SMART rail. The Petaluma Downtown station is at 220 Lakeville Street, across the river from the historic core. Trains run south to Larkspur, where the station is at 600 Larkspur Landing Circle. Our guide to homes near SMART and the ferry covers commute options.
Highway 101 runs north to south east of downtown, so west side drivers cross town to reach it.
Helen Putnam Regional Park. The county park has about 6 miles of trails through grassland and oak woodland, a fishing pond and a playground. Trailheads are at 411 Chileno Valley Road and 373 Windsor Drive.

Local rules and costs

Item	West Petaluma (inside city limits)
Jurisdiction	City of Petaluma, Sonoma County
County transfer tax	$0.55 per $500 of value ($1.10 per $1,000), after deducting assumed loans
City transfer tax	$2.00 per $1,000 (Petaluma Municipal Code 4.20.020), with no deduction for assumed loans
Historic review	Historic and Cultural Preservation Committee for landmarks and district properties (IZO 15.050)
Flood map	FEMA Flood Insurance Rate Map
Fire map	2025 LRA and SRA fire hazard severity zone viewer, linked by the city

Petaluma also has its own tenant protections, mobile home rules and short-term rental rules, which our Petaluma guide summarizes. On a $1,200,000 sale inside city limits with no assumed loan, the county tax is $1,320 and the city tax $2,400, for $3,720 in all. See our California transfer tax guide for how the tax is figured.

Selling a home in West Petaluma

Buyers of older and historic homes ask detailed questions, and the answers are in documents. A seller who gathers them before listing is in a stronger position when an offer comes in.

Confirm status. Ask Planning whether the house is in a historic district, a landmark or a surveyed resource, and gather the district guidelines.
Pull the permit file. Match additions, window replacements, decks and second units to permits, including any historic approvals.
Consider pre-listing inspections, especially foundation, sewer lateral and pest reports. Our pre-listing inspection guide weighs the pros and cons.
Check hazard maps. Flood and fire zones drive disclosures and, in High or Very High fire zones, defensible space paperwork.
Price from the right comparables. West side and east side homes trade differently, so use sales from similar streets, ages and conditions.

We did not find a Petaluma point-of-sale inspection ordinance for single-family homes, but confirm current requirements with the city before you list.

Questions people ask

Where is the Oakhill-Brewster Historic District?

The city describes it as north and west of downtown Petaluma. It was adopted as a local historic district by the City Council in 1990, with its own preservation guidelines and standards.

Do I need city approval to replace windows on a historic Petaluma house?

If the house is a designated landmark or in a historic district, yes in most cases. Petaluma’s zoning code treats repair or replacement of exterior materials, including windows and doors, as an alteration that needs Historic and Cultural Preservation Committee approval, with administrative approval for minor work.

Can I repaint a house in a Petaluma historic district?

Repainting in the same colors is treated as minor work that still needs administrative approval. Changing paint colors is treated as a full alteration under section 15.050.

Is West Petaluma in a flood zone?

Petaluma’s mapped floodplain follows the Petaluma River, so it depends on the parcel. Check the FEMA Flood Insurance Rate Map for the address, and remember the city warns that localized flooding can occur outside mapped zones.

What is the transfer tax on a West Petaluma sale?

Inside city limits, the county tax of $1.10 per $1,000 plus Petaluma’s $2.00 per $1,000, for $3.10 per $1,000 in total. The city tax doesn’t deduct assumed loans. In North Bay markets the seller customarily pays, but it’s negotiable.

Does Petaluma have a Mills Act program?

We did not find one on the city’s historic preservation page. Ask the Planning Division whether Mills Act contracts are currently available.

Which SMART station serves West Petaluma?

The Petaluma Downtown station at 220 Lakeville Street, just across the river from the historic core. Trains run south to Larkspur.

If you are buying or selling an older home on Petaluma’s west side, Diamond Real Estate Group can help you sort out the records, the review rules and the right comparable sales. Start with a free home valuation, or explore the rest of Sonoma County.

Sources & notes

Last reviewed October 2026 by Matthew Martinez.