Total monthly cost of ownership
Cost to Own a Home in Islandia, New York
A $452,000 home here costs
$3,936per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $2,324. The real number is $1,612 higher every month — 69% 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.
Islandia against Suffolk County and New York
| Measure | Islandia | Suffolk County |
|---|---|---|
| Median home value | $451,700 | $539,500 |
| Median property tax | $9,583 | $10,001 |
| Effective tax rate | 2.122% | 1.854% |
| Median gross rent | $1,781 | $2,190 |
| Population | 3,581 | 1,525,680 |
The weather behind that power bill
Islandia sits in Suffolk County, which averages a high of 83.9°F in its hottest month and a low of 26.0°F in its coldest, with 47.22" of precipitation a year and 27% of it in a single three-month stretch. That climate drives 945 cooling and 4,906 heating degree days, which is what sets the $269 electricity line above.
See the full climate breakdown for Suffolk County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Suffolk County
Full Suffolk County cost breakdown · Every county in New York
Common questions
How much does it cost to own a home in Islandia?
A $452,000 home in Islandia, New York costs approximately $3,936 per month with 20% down at 6.66%. That is $2,324 principal and interest, $799 property tax, $99 homeowners insurance, $337 utilities and $377 set aside for maintenance.
What is the property tax rate in Islandia?
Islandia has an effective property tax rate of 2.122%, based on a median home value of $451,700 and median real estate taxes of $9,583. That is higher than the Suffolk County average of 1.854%.
What is the average home price in Islandia?
The median owner-occupied home value in Islandia, New York is $451,700, against $539,500 across Suffolk County.
Is it cheaper to rent or buy in Islandia?
Median gross rent in Islandia is $1,781 a month, against $3,936 to own the median home all in. Renting costs less month to month here, though renting builds no equity.
Sources & methodology
- Median home value, real estate taxes, gross rent and population for Islandia — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for New York.
- 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.