Multnomah County Home Building Costs
Building a house in Multnomah County, Oregon costs about $241/sq ft in 2026 — roughly $424,160–$539,840 for a 2,000 sq ft mid-range home (construction only, land excluded). Population: 815,000.
Real Permit Activity in Multnomah County (2025)
Permit valuations are builder-declared at filing and typically understate final construction cost.
Source: U.S. Census Bureau Building Permits Survey, 2025 annual data.
Local Market Factors
- ›Portland
- ›Most expensive in state
- ›Strict green building codes
What building in Multnomah County actually involves
Cost per square foot is one number. These are the local conditions behind it.
How busy this market is
Multnomah County ranks 3rd of 35 counties in Oregon for single-family permits issued in 2025, accounting for 10.8% 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 36.1% of finished property value in Oregon, which is a markup of about 56% on construction cost. For the $482,000 build above, that implies roughly $269,920 for the lot.
This is a statewide figure. Lots inside Multnomah 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, Oregon. BLS Occupational Employment and Wage Statistics, May 2025.
Climate, spec and timing
- 5,121 heating and 313 cooling degree days a year in Oregon — heating drives the mechanical budget. (NOAA, 2016-2025 average)
- The median new home in the West is 2,090 sq ft and the Census median contract price there is $176.87/sq ft, excluding land — the same basis as our estimate above. (Census Survey of Construction 2025)
- Oregon issued 9,215 single-family permits in 2025 overall. See the 35-year state history.
Reconciling our estimate with permit filings
The average declared valuation on Multnomah County permits was $302,815 per single-family unit, against our $482,000 estimate for a 2,000 sq ft mid-range build. These two numbers are not measuring the same thing and should not match: builders declare a valuation for permit-fee purposes, which is routinely below the finished construction cost, and the permits cover homes of every size and finish level rather than a 2,000 sq ft mid-range one. We show both because the gap between them is itself informative — and because quoting only the flattering one would be dishonest.
Cost by Home Size in Multnomah County
| Home Size | Basic | Mid-Range | Premium |
|---|---|---|---|
| 500 sq ft | $89,093 | $120,500 | $164,085 |
| 1,000 sq ft | $178,186 | $241,000 | $328,170 |
| 1,500 sq ft | $267,279 | $361,500 | $492,255 |
| 2,000 sq ft | $356,372 | $482,000 | $656,340 |
| 2,500 sq ft | $445,465 | $602,500 | $820,426 |
| 3,000 sq ft | $534,559 | $723,000 | $984,511 |
| 4,000 sq ft | $712,745 | $964,000 | $1,312,681 |
| 5,000 sq ft | $890,931 | $1,205,000 | $1,640,851 |
Costs are estimates only and represent construction costs, excluding land, architect fees, permits, and landscaping. Land in Oregon averages 36.1% of finished property value (FHFA), which adds roughly 56% on top of these construction figures.
County multiplier of 1.15× applied to Oregon 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. For planning purposes only.