Total monthly cost of ownership
Cost to Own a Home in Northbrook, Illinois
A $644,000 home here costs
$5,216per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $3,311. The real number is $1,905 higher every month — 58% 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.
Northbrook against Cook County and Illinois
| Measure | Northbrook | Cook County |
|---|---|---|
| Median home value | $644,100 | $305,200 |
| Median property tax | $10,001 | $6,053 |
| Effective tax rate | 1.553% | 1.983% |
| Median gross rent | $2,334 | $1,381 |
| Population | 34,642 | 5,185,812 |
The weather behind that power bill
Northbrook sits in Cook County, which averages a high of 84.0°F in its hottest month and a low of 16.1°F in its coldest, with 33.23" of precipitation a year and 35% of it in a single three-month stretch. That climate drives 822 cooling and 6,364 heating degree days, which is what sets the $214 electricity line above.
See the full climate breakdown for Cook County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Cook County
Common questions
How much does it cost to own a home in Northbrook?
A $644,000 home in Northbrook, Illinois costs approximately $5,216 per month with 20% down at 6.66%. That is $3,311 principal and interest, $833 property tax, $252 homeowners insurance, $282 utilities and $537 set aside for maintenance.
What is the property tax rate in Northbrook?
Northbrook has an effective property tax rate of 1.553%, based on a median home value of $644,100 and median real estate taxes of $10,001. That is lower than the Cook County average of 1.983%.
What is the average home price in Northbrook?
The median owner-occupied home value in Northbrook, Illinois is $644,100, against $305,200 across Cook County.
Is it cheaper to rent or buy in Northbrook?
Median gross rent in Northbrook is $2,334 a month, against $5,216 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 Northbrook — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for Illinois.
- 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.