Total monthly cost of ownership
Cost to Own a Home in Portsmouth, New Hampshire
A $641,000 home here costs
$5,084per month, all in, with 20% down at today's 7.24% 30-year fixed rate. By the 28% rule that takes a household income of about $218,000 a year.
A standard mortgage calculator would have told you $3,495. The real number is $1,589 higher every month, 45% more than the payment most buyers budget for.
Compare Rockingham County with anywhere in America · full county breakdown
Where every dollar goes
Only the first line is a mortgage payment. Change any assumption above and every figure below recalculates.
Portsmouth against Rockingham County and New Hampshire
| Measure | Portsmouth | Rockingham County |
|---|---|---|
| Median home value | $640,600 | $461,400 |
| Median property tax | $7,876 | $7,512 |
| Effective tax rate | 1.229% | 1.628% |
| Median gross rent | $1,778 | $1,619 |
| Population | 22,332 | 317,163 |
The weather behind that power bill
Portsmouth sits in Rockingham County, which averages a high of 82.0°F in its hottest month and a low of 14.3°F in its coldest, with 46.3" of precipitation a year and 27% of it in a single three-month stretch. That climate drives 499 cooling and 6,865 heating degree days, which is what sets the $171 electricity line above.
See the full climate breakdown for Rockingham County , month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Rockingham County
Full Rockingham County cost breakdown · Every county in New Hampshire
Talk to someone who works this market
These are Portsmouth averages. What one specific house costs to own, or what it would sell for today, depends on the street and the condition of the place. We will connect you with one licensed local agent who works Portsmouth every week. Free, no obligation, and we never sell your details to a list.
I'm looking to buy in Portsmouth I already own here and may sell
Common questions
How much does it cost to own a home in Portsmouth?
A $641,000 home in Portsmouth, New Hampshire costs approximately $5,084 per month with 20% down at 7.24%. That is $3,495 principal and interest, $656 property tax, $159 homeowners insurance, $239 utilities and $534 set aside for maintenance.
What is the property tax rate in Portsmouth?
Portsmouth has an effective property tax rate of 1.229%, based on a median home value of $640,600 and median real estate taxes of $7,876. That is lower than the Rockingham County average of 1.628%.
What is the average home price in Portsmouth?
The median owner-occupied home value in Portsmouth, New Hampshire is $640,600, against $461,400 across Rockingham County.
Is it cheaper to rent or buy in Portsmouth?
Median gross rent in Portsmouth is $1,778 a month, against $5,084 to own the median home all in. Renting costs less month to month here, though renting builds no equity.
What salary do you need to buy a home in Portsmouth?
Using the standard 28% rule, housing costs at no more than 28% of gross income, buying the median home in Portsmouth, New Hampshire at today's rate takes a household income of roughly $218,000 a year. That covers the full $5,084 monthly cost, not just the mortgage payment.
Sources & methodology
- Median home value, real estate taxes, gross rent and population for Portsmouth, US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance, NAIC average premium for New Hampshire.
- 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.