Cost to Build a House in Hillsborough County, New Hampshire
Building a house in Hillsborough County, New Hampshire costs about $227/sq ft in 2026 — roughly $399,520–$508,480 for a 2,000 sq ft mid-range home (construction only, land excluded). 380 single-family homes were permitted here in 2025, and the typical existing home is worth $555,063. Population: 430,000.
That applies a local adjustment of +8% to the New Hampshire average of $210/sq ft.
How much building happens in Hillsborough County
Single-family homes permitted each year, 2000–2025. 2025 is highlighted; the 2008–2011 crash years are darker.
Hillsborough County is building 76% fewer homes than it did before the crash, up from a low of 321 in 2009. A thinner builder market can mean fewer bids and longer waits for specialist trades.
U.S. Census Bureau Building Permits Survey, county annual files 2000–2025 (1-unit structures, total including imputation).
Build or buy in Hillsborough County?
Building a median-size new home in Hillsborough County costs about $390,193 more than buying the typical existing one. That gap is wider than the New Hampshire average of +61.4%, because existing homes here are cheaper than elsewhere in the state.
The two sides are not the same product: the build is brand new at the median new-home size for the Northeast, the existing home is typically older and smaller. Lot cost uses New Hampshire's average land share, and local lot prices can be well above or below it. Full New Hampshire build-vs-buy comparison
Existing home value: Zillow Home Value Index, single-family, middle tier (2026-08) — an index of typical value, not a median sale price. Land: FHFA Working Paper 19-01.
What builders declared on Hillsborough County permits (2025)
The average declared valuation was $423,312 per home, against our $454,000 estimate for a 2,000 sq ft mid-range build. The two measure different things: builders declare a valuation for permit-fee purposes, which routinely understates finished cost, and permits cover homes of every size and finish level. We show both because quoting only the flattering one would be dishonest.
Source: U.S. Census Bureau Building Permits Survey, 2025 annual data.
Local Market Factors
- ›Manchester/Nashua
- ›Boston commuter market drives costs
What building in Hillsborough County actually involves
Cost per square foot is one number. These are the conditions behind it.
How busy this market is
Hillsborough County ranks 2nd of 10 counties in New Hampshire for single-family permits issued in 2025, accounting for 11.6% of all the single-family homes permitted statewide that year.
That puts it among the busiest building markets in the state — deep contractor supply, but also the most competition for their time.
U.S. Census Bureau Building Permits Survey, co2025a.txt (2025).
What land adds on top
Land averages 41% of finished property value in New Hampshire, which is a markup of about 69% on construction cost. For the $454,000 build above, that implies roughly $313,260 for the lot.
This is a statewide figure. Lots inside Hillsborough County's built-up areas will run above it and rural parcels below, so treat it as an order of magnitude rather than a budget line.
FHFA Working Paper 19-01 land values.
What the trades cost
Median hourly wage, New Hampshire. BLS Occupational Employment and Wage Statistics, May 2025.
Climate, spec and timing
- 7,042 heating and 380 cooling degree days a year in New Hampshire — heating drives the mechanical budget. (NOAA, 2016-2025 average)
- The median new home in the Northeast is 2,459 sq ft and the Census median contract price there is $179.3/sq ft, excluding land — the same basis as our estimate above. (Census Survey of Construction 2025)
- Statewide, permit filings peak in May and bottom out in January. Contractors have the most capacity in the quiet months.
- New Hampshire issued 3,279 single-family permits in 2025 overall. See the 35-year state history.
Cost by Home Size in Hillsborough County
| Home Size | Basic | Mid-Range | Premium |
|---|---|---|---|
| 500 sq ft | $83,918 | $113,500 | $154,553 |
| 1,000 sq ft | $167,835 | $227,000 | $309,106 |
| 1,500 sq ft | $251,753 | $340,500 | $463,660 |
| 2,000 sq ft | $335,670 | $454,000 | $618,213 |
| 2,500 sq ft | $419,588 | $567,500 | $772,766 |
| 3,000 sq ft | $503,505 | $681,000 | $927,319 |
| 4,000 sq ft | $671,340 | $908,000 | $1,236,426 |
| 5,000 sq ft | $839,176 | $1,135,000 | $1,545,532 |
Other New Hampshire counties
Costs are estimates only and represent construction costs, excluding land, architect fees, permits, and landscaping. Land in New Hampshire averages 41% of finished property value (FHFA), which adds roughly 69% on top of these construction figures.
County multiplier of 1.08× applied to the New Hampshire state average (which itself is 1.12× the national average of $188/sq ft).
Cost data: HouseBuildCalc Permit Cost Index (876,000+ building permits, 1,700+ ZIP codes), U.S. Census Bureau Survey of Construction, BLS Producer Price Index, NAHB Cost of Constructing a Home (published summaries). County-level multipliers are estimates derived from regional market data. County permits: U.S. Census Bureau Building Permits Survey. Home values: Zillow Home Value Index. For planning purposes only.