Cost to Build a House in St. Marys County, Maryland
Building a house in St. Marys County, Maryland costs about $221/sq ft in 2026 — roughly $388,960–$495,040 for a 2,000 sq ft mid-range home (construction only, land excluded). 264 single-family homes were permitted here in 2025, and the typical existing home is worth $440,800.
That is the Maryland statewide rate: no public source measures construction cost county by county, so we don't invent a local premium. What does differ by county is measured below.
How much building happens in St. Marys County
Single-family homes permitted each year, 2000–2025. 2025 is highlighted; the 2008–2011 crash years are darker.
St. Marys County is building 76% fewer homes than it did before the crash, up from a low of 238 in 2022. 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 St. Marys County?
Building a median-size new home in St. Marys County costs about $329,848 more than buying the typical existing one. That gap is wider than the Maryland average of +71.5%, 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 South, the existing home is typically older and smaller. Lot cost uses Maryland's average land share, and local lot prices can be well above or below it. Full Maryland 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 St. Marys County permits (2025)
The average declared valuation was $320,030 per home, against our $442,000 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.
What building in St. Marys County actually involves
Cost per square foot is one number. These are the conditions behind it.
How busy this market is
St. Marys County ranks 9th of 23 counties in Maryland for single-family permits issued in 2025, accounting for 3.2% of all the single-family homes permitted statewide that year.
That is a quieter market. Fewer active builders can mean less competitive bidding and longer waits for specialised trades.
U.S. Census Bureau Building Permits Survey, co2025a.txt (2025).
What land adds on top
Land averages 38% of finished property value in Maryland, which is a markup of about 61% on construction cost. For the $442,000 build above, that implies roughly $269,620 for the lot.
This is a statewide figure. Lots inside St. Marys 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.
Statewide factors
Trade wages, climate load, energy code and permit seasonality are set at state level, so they are the same for every Maryland county. See them on the Maryland page.
Cost by Home Size in St. Marys County
| Home Size | Basic | Mid-Range | Premium |
|---|---|---|---|
| 500 sq ft | $81,699 | $110,500 | $150,468 |
| 1,000 sq ft | $163,399 | $221,000 | $300,936 |
| 1,500 sq ft | $245,098 | $331,500 | $451,404 |
| 2,000 sq ft | $326,798 | $442,000 | $601,872 |
| 2,500 sq ft | $408,497 | $552,500 | $752,340 |
| 3,000 sq ft | $490,197 | $663,000 | $902,809 |
| 4,000 sq ft | $653,596 | $884,000 | $1,203,745 |
| 5,000 sq ft | $816,995 | $1,105,000 | $1,504,681 |
Other Maryland counties
Costs are estimates only and represent construction costs, excluding land, architect fees, permits, and landscaping. Land in Maryland averages 38% of finished property value (FHFA), which adds roughly 61% on top of these construction figures.
Priced at the Maryland state average, which is 1.18× the national average of $188/sq ft. Permit and home-value figures are specific to St. Marys County.
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 permits: U.S. Census Bureau Building Permits Survey. Home values: Zillow Home Value Index. For planning purposes only.