Total monthly cost of ownership
Cost to Own a Home in Diablo, California
A $2,000,000 home here costs
$13,459per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $10,282. The real number is $3,177 higher every month — 31% more than the payment most buyers budget for.
Where every dollar goes
Only the first line is a mortgage payment. Change any assumption above and every figure below recalculates.
Diablo against Contra Costa County and California
| Measure | Diablo | Contra Costa County |
|---|---|---|
| Median home value | $2,000,001 | $830,800 |
| Median property tax | $10,001 | $6,903 |
| Effective tax rate | 0.500% | 0.831% |
| Median gross rent | — | $2,322 |
| Population | 1,072 | 1,161,458 |
The weather behind that power bill
Diablo sits in Contra Costa County, which averages a high of 82.8°F in its hottest month and a low of 41.3°F in its coldest, with 26.05" of precipitation a year and 58% of it in a single three-month stretch. That climate drives 926 cooling and 3,309 heating degree days, which is what sets the $299 electricity line above.
See the full climate breakdown for Contra Costa County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Contra Costa County
Full Contra Costa County cost breakdown · Every county in California
Common questions
How much does it cost to own a home in Diablo?
A $2,000,000 home in Diablo, California costs approximately $13,459 per month with 20% down at 6.66%. That is $10,282 principal and interest, $833 property tax, $310 homeowners insurance, $367 utilities and $1,667 set aside for maintenance.
What is the property tax rate in Diablo?
Diablo has an effective property tax rate of 0.500%, based on a median home value of $2,000,001 and median real estate taxes of $10,001. That is lower than the Contra Costa County average of 0.831%.
What is the average home price in Diablo?
The median owner-occupied home value in Diablo, California is $2,000,001, against $830,800 across Contra Costa County.
Is it cheaper to rent or buy in Diablo?
Rent data is not published for Diablo at this level of detail.
Sources & methodology
- Median home value, real estate taxes, gross rent and population for Diablo — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for California.
- Electricity price — EIA Electric Power Monthly Table 5.6.A.
- Mortgage rate — Freddie Mac PMMS, refreshed weekly.
- Maintenance (1%/yr) and water and sewer ($68/mo) are national estimates. Every assumption above is editable.