Prop 19 lets Ventura County homeowners age 55 or older transfer their existing property tax base to a new primary residence anywhere in California, up to three times in their lifetime, as long as the replacement home is purchased within two years of the sale. If the new home costs more than the one sold, the difference is added to the old taxable value rather than triggering a full reassessment, which can save a downsizing Conejo Valley seller thousands of dollars a year.
Key Takeaways
- Prop 19 allows Ventura County homeowners age 55 or older to transfer their property tax base to a new primary residence anywhere in California up to three times in a lifetime.
- Replacement homes must be purchased within two years of the original sale, and at least one owner must be 55 or older on the date of sale.
- Ventura County's median effective property tax rate is 1.15%, and the median annual tax bill is $5,829, compared to the national median of $2,400.
- In a worked example, a Thousand Oaks home bought in 1998 for $310,000 carries a factored base year value near $560,000, keeping annual taxes around $6,400 instead of about $12,800 at full reassessment.
- If a replacement home costs more than the sale price, only the price difference is added to the old taxable value, such as $560,000 plus $150,000 equaling a new $710,000 base year value.
If you bought your Thousand Oaks or Westlake Village home in the 1990s or early 2000s, your property tax bill is probably a fraction of what a new buyer would pay on the same house today. That gap is exactly why so many longtime Conejo Valley homeowners feel stuck. The good news is that a Prop 19 property tax transfer Ventura County homeowners qualify for can let you sell, buy something better suited to this stage of life, and keep most or all of that old, low tax bill intact. This guide walks through the real numbers, the real forms, and the real Ventura County Assessor process, using actual Conejo Valley home values.
What Is Prop 19 Base Year Value Transfer and Who Qualifies in Ventura County?
Proposition 19 took effect for qualifying transfers after March 31, 2021, involving people over 55, severely and permanently disabled, or disaster victims whose property sustains more than 50% damage . Under the law, homeowners age 55 or older, or severely and permanently disabled of any age, can transfer the taxable value of their principal residence to a replacement property up to three times anywhere in the state . That taxable value is your base year value plus inflationary adjustments, commonly referred to as a factored base year value , not your current market value. Before Prop 19, moving even a few miles within California could mean a full reassessment at market value, which for many Conejo Valley sellers translated into a property tax bill three or four times higher than what they were used to paying. Prop 19 removed that penalty for age qualified homeowners, and it also removed the old restriction that limited transfers to only 10 California counties that had accepted incoming base transfers, before the geographic walls were removed entirely . Ventura County has long been one of the participating counties, since it was one of ten counties in California with an ordinance enabling intercounty base year value transfer as of November 7, 2018 , so moving from Los Angeles County into Thousand Oaks, Westlake Village, or Newbury Park under the current rules is fully supported.
Who actually qualifies
To use the senior exclusion, at least one owner of the sold property must be 55 or older on the date of sale, and the replacement home must become your new principal residence. Eligibility follows the state's core rule: the sale of the original home or the purchase of the replacement must occur on or after April 1, 2021 , and a claimant who is at least 55 must submit proof of age. If you are weighing whether a move makes financial sense at all, it helps to first understand what selling looks like in today's Thousand Oaks market before you calculate the tax side of the equation.
How Much Could a Conejo Valley Seller Actually Save by Transferring Their Tax Base?
The savings depend entirely on how long you have owned your current home and what your replacement home costs. Ventura County's median effective property tax rate runs 1.15%, above the national median of 1.02% , and the median annual Ventura County tax bill is $5,829, $3,429 higher than the national median of $2,400 . For homeowners who bought decades ago, the gap between their old assessed value and today's market prices can be enormous. Here is a worked example using real Conejo Valley numbers. Say you bought your Thousand Oaks home in 1998 for $310,000. With California's Prop 13 annual cap of roughly 2%, your factored base year value today would be approximately $560,000, meaning your current property tax bill is close to $6,400 a year. Thousand Oaks now has a median sale price around $1,117,000 as of March 2026 , so a same size replacement home nearby would otherwise be assessed at full market value if you did not qualify for Prop 19, pushing your new tax bill to roughly $12,800 a year, nearly double. With Prop 19, if your replacement home is equal to or less than your sale price, you simply carry over your $560,000 factored base year value, keeping your bill near $6,400 a year. If you buy up, the excess above the sale price is added dollar for dollar. So if you sell for $1,050,000 and buy a $1,200,000 home in Westlake Village or Newbury Park, your new base year value becomes $560,000 plus $150,000, or $710,000, not the full $1,200,000. That is a difference of roughly $5,600 in annual property tax, year after year, for as long as you own the home.
Estimated Annual Property Tax: With vs. Without Prop 19 Transfer
$0$3.5K$7K$10.5K$14K$6,400$13,300$8,200Current BillNo Prop 19With Prop 19Illustrative example: $310K 1998 purchase moving into a $1.2M Conejo Valley home
Source: Ventura County Assessor effective tax rate data and Redfin median sale prices, 2026.
How Do You File a Prop 19 Claim With the Ventura County Assessor?
The process itself is straightforward, but timing and paperwork matter. Here is the step by step process using the actual Ventura County Assessor's office procedures.
- Confirm your eligibility. At least one owner must be 55 or older (or severely disabled) on the date the original home sells, and the sale or purchase must fall on or after April 1, 2021.
- Sell your original residence and close on a replacement home within the required window. Retroactive relief is available if you file within three years of the replacement's purchase or construction, and you own and occupy the replacement property as your principal residence at the time of filing . If you miss that three year window, you can still qualify, but the reduced assessment will begin the year the claim is filed rather than retroactively.
- Complete form BOE-19-B, the Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least 55 Years of Age, available directly through the Ventura County Assessor's Prop 19 resources.
- File it with the Ventura County Assessor's office at 800 South Victoria Avenue, Ventura, CA 93009, either by mail, in person, or through their online property information portal. You can reach the office directly at (805) 654-2181 with questions about your specific parcel or filing status.
- Wait for the Assessor's certification. The county will issue a Certification of Value (form BOE-19-C) establishing your new base year value on the replacement home.
- Review your new tax bill to confirm the transferred base year value was applied correctly before your first installment is due.
Because the transfer limit is up to three times for age and disability claims , it is worth thinking ahead. If you are also weighing what a new home purchase does to your overall tax picture, our comparison of Los Angeles County and Ventura County tax implications is a useful companion read, especially if you are considering a move across the county line into Calabasas or Hidden Hills.
Where Can You Move Within Ventura County and Still Qualify?
Because Prop 19 allows transfers to a property located anywhere in the state , you are not limited to staying in the same neighborhood. Many Conejo Valley sellers downsize from a larger family home in Thousand Oaks or Westlake Village into a smaller single story property in Newbury Park, Oak Park, or one of Camarillo's dedicated 55+ communities. Current pricing across the area varies significantly, which affects how much of your sale proceeds you keep and how the "equal or lesser value" math plays out.
| Area | Typical Home Value (2026) | Notes for 55+ Sellers |
|---|---|---|
| Thousand Oaks | ~$1,052,875 average value | Zillow reports an average Thousand Oaks home value of $1,052,875, up 0.5% over the past year |
| Westlake Village | ~$1,608,558 average value | Zillow reported an average Westlake Village home value of $1,608,558 as of June 30, 2026 |
| Newbury Park | ~$1,026,272 average value | The average Newbury Park home value is $1,026,272, up 0.3% over the past year |
| Oak Park | ~$1,085,696 average value | The typical home value of homes in Oak Park is $1,085,696 |
| Agoura Hills | ~$1,262,997 average value | The average Agoura Hills home value is $1,262,997, up 0.8% over the past year |
| Leisure Village, Camarillo (55+) | ~$623,000 average price | The average price of homes in Leisure Village is around $623,000 , a common downsizing destination for Conejo Valley sellers |
This spread matters because a Thousand Oaks seller cashing out of a $1.1 million home and moving into a $623,000 unit at Leisure Village keeps their full factored base year value with no addition at all, while a Westlake Village seller moving into a similarly priced Westlake Village replacement stays roughly even. For buyers weighing whether to stay in the Conejo Valley or explore a smaller home nearby, it also helps to compare lifestyle fit, not just price. Our breakdown of Oak Park versus Agoura Hills and Oak Park versus Westlake Village cover walkability, HOA culture, and day to day convenience that matter as much as square footage once you are downsizing.
Many sellers in this stage of life spend a Saturday morning walking the trail loop around Wildwood Regional Park to Paradise Falls before deciding whether a smaller lot still gives them the lifestyle they want, or head out to the Dos Vientos Open Space trail network in Newbury Park, which offers more than 41 miles of hiking and cycling trails right off Borchard Road. If dining out is part of your retirement picture, the walkable cluster of restaurants near Civic Arts Plaza, including Mastro's Steakhouse, is one more reason many sellers choose to stay close rather than leave the Conejo Valley altogether.
Frequently Asked Questions About Prop 19 Property Tax Transfer in Ventura County
Can I transfer my Thousand Oaks property tax base to a new home?
Yes. If you or a co-owner is 55 or older, you can transfer your factored base year value from your Thousand Oaks home to a replacement primary residence anywhere in California, including elsewhere in the Conejo Valley or a different county entirely. The replacement must be purchased within two years of the sale, and you must file form BOE-19-B with the county where the new home is located.
How many times can I use Prop 19 transfer in California?
Homeowners who qualify based on age or disability can use the base year value transfer up to three times in their lifetime . This is a meaningful change from the old Prop 60/90 rules, which allowed only a one time only benefit . Disaster victims are not subject to the three time cap.
What is the 2026 exclusion cap on the value difference?
If your replacement home costs more than your original home, the excess is added to your transferred base year value rather than triggering a full market reassessment. For example, under the Board of Equalization's illustration, when a replacement residence is valued $200,000 more than the original residence, that difference is added to the transferred base year value, making the new base year value the original amount plus $200,000 . There is no dollar cap on how large this addition can be for the senior exclusion, unlike the separate $1 million cap that applies to parent to child transfers.
Do I need to stay in Ventura County to keep my tax base?
No. Because Prop 19 allows the tax base to be transferred to a property located anywhere in the state , you could move from Thousand Oaks to Ventura County communities like Camarillo or Moorpark, or even into Los Angeles County locations such as Calabasas or Sherman Oaks, and still carry your factored base year value with you, as long as all other eligibility requirements are met.
What happens if I file my BOE-19-B claim late?
You will not lose the benefit entirely. Filing within three years of the purchase date secures retroactive relief back to the purchase date, but if you do not file within three years, you can still qualify, though the reduced assessment will begin the year the claim is filed rather than retroactively, which can mean paying full market rate taxes in the interim.
If you are ready to explore whether a move makes sense financially, our detailed guide to selling in Westlake Village and our companion piece on selling in Newbury Park walk through pricing strategy alongside the tax considerations covered here. For the full statewide picture beyond the senior transfer rules, see our broader explainer on how Prop 19 works when you move in California.
Wondering exactly how much you'd save by transferring your tax base to a new Conejo Valley home? Get a free, personalized Prop 19 savings estimate from Davis Bartels. Call (805) 341-6125 or request your custom report online.
Thinking About Buying or Selling in Thousand Oaks, Westlake Village, Newbury Park, Oak Park, Agoura Hills (Ventura County-wide)?
Davis Bartels and the DB Real Estate Group have served families across the Conejo Valley and Ventura County since 2009, with 500+ closed transactions and nearly $500 million in career sales volume, including a career-best 100 closings and $103M+ in 2025. Whether you're exploring your options or ready to make a move, reach out for a no pressure conversation about your goals.
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