4146 20th Avenue Southwest, Seattle
technical data · neighborhood and transit
Quick answers
- Does 4146 20th Avenue Southwest have open permits or code violations?
- Seattle Department of Construction and Inspections lists 6 permits, all closed, and 0 violations.
- What is the 2026 conforming loan limit in King County?
- $1,063,750 for a single-unit home, per FHFA. Larger loans are jumbo loans.
- Is radon a problem here?
- EPA radon zone 3, low potential.
- What natural disasters is 4146 20th Avenue Southwest at risk for?
- FEMA's National Risk Index rates the area relatively high overall, with elevated earthquake risk.
Permits and code violations
Every permit on file is closed out.
- Addition/alteration Nov 2023Completed
Construct alterations to existing single family residence per stfi
- Addition/alteration Aug 2023Completed
Replace 8 windows like for like manner for sfr subject to field inspection stfi.
- Addition/alteration Jun 2018Completed
Additions and substantial alterations to existing single family residence per plan.
- Violation Apr 2007Completed
Closed as incomplete - expired permit demolish exist. garage per plans (stfi).
- New Apr 2007Completed
Establish use and const. single family dwelling with attached garage per plans.
- Addition/alteration Mar 2006Completed
Construct basement and 1st floor addition deck addition to first floor and alterations to existing single family residence including raising the structure per plan.
Seattle Department of Construction and Inspections
Safety and environment
FEMA natural hazard risk
Relatively High
Highest for this area: earthquake. These drive insurance cost here.
FEMA National Risk Index, census tract
Superfund site
1.0 mi
Harbor Island (Lead) (NPL Site). Check groundwater and vapor reports on the EPA site page.
EPA National Priorities List
Leaking fuel tanks
2 within 1,650 ft
Nearest: Seattle Sd Cooper Elementary, 1901 Sw Genesee St (850 ft), open. 2 still open. Ask whether groundwater or soil vapor testing was done.
EPA UST Finder, leaking underground storage tank releases
Toxic release facility
1,650 ft
Nucor Steel Seattle Inc and 9 more within a mile. Reports chemical releases to air, water or land to EPA each year.
EPA Toxics Release Inventory
Radon potential
Low
Geology here keeps indoor radon low on average.
EPA and USGS Geologic Radon Potential Map
Wildfire risk
Very Low
Wildfire risk is low enough that standard home insurance usually covers it.
FEMA National Risk Index
Nearest public schools
950 ft
Pathfinder K-8 School (950 ft), Southwest Youth and Family Services (1,650 ft). Confirm the assigned school with the district.
U.S. Department of Education, NCES
Major airport
8.2 mi
Seattle-Tacoma (SEA). Aircraft may be audible under approach paths.
FAA large-hub airports
Conforming loan limit 2026
$1,063,750
King County. Mortgages up to this amount qualify for Fannie Mae and Freddie Mac pricing. Above it, the loan is a jumbo with stricter terms.
FHFA Conforming Loan Limit Values, one-unit
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Who lives and works in Seattle
Cloud, aerospace and one of the highest engineering wage bases in the country
Seattle is a two-industry city that pays well. Cloud and aerospace set salaries, the downtown core is dense with towers, and the residential neighborhoods around it stay low rise and green.
- $116,068
- median household income
- 20.9%
- residents aged 25 to 34
- 46%
- households that own their home
What pays the bills
- Cloud and software
- Aerospace
- Retail headquarters
- Healthcare
- Maritime
Who anchors the economy
Amazon · Microsoft · Boeing · Starbucks · University of Washington
The market is shaped around
- Engineers and product staff
- Dual-income couples
- Owners in low-rise neighborhoods
More on 20th Avenue Southwest
All addressesViewing recommendations
What's worth checking in person before deciding.
- Test water pressure and temperature at the tap, in the bathroom and kitchen, for at least a minute.
- This is a house, not an apartment. Check the lot boundaries, car access, and how water drains from the yard after rain, including whether the neighboring lot sits higher and could send water toward the property.
- Ask to see the construction documents (permit, sign-off) and check for visible cracks on the facade or in the attic/basement.
- Check exactly where you'd park: a spot in the yard or garage, or street parking, and how crowded the street gets in the evening.
- Knock on a neighboring gate and ask about noise, pets, flooding, or other issues common in the area.
- Check the sewer connection (public network or septic tank) and the water source (public network or well), including pressure and water quality.
- Ask what heating system is in place (own boiler, wood, gas) and request the last winter month's bills.
Neighborhood recommendations are derived from public OpenStreetMap data and may be incomplete. Checking in person is still what matters most.