Seattle Property Intelligence

Earthquake liquefaction zones

fill areas near the Duwamish River, SoDo, and parts of Capitol Hill sit on soils that can liquefy during a seismic event. CaveatBuyer maps every property against King County's liquefaction susceptibility layers.

Volcanic lahar inundation

Mount Rainier lahar flows would follow the Puyallup River valley into Tacoma and surrounding areas. Pierce County properties are mapped against 7 lahar FeatureServer layers with 3-tier severity classification.

Sewer lateral failure risk

Seattle's combined sewer system means many homes connect to aging clay or concrete laterals. CaveatBuyer's proprietary Sewer Failure Score analyzes pipe material, age, tree proximity, and soil type to estimate failure risk.

Knob-and-tube wiring in pre-1950 homes

34% of Seattle properties built before 1950 trigger elevated insurance difficulty ratings based on CaveatBuyer's analysis. K&T wiring is the single most common insurance-complicating factor in the Seattle market.

Sound Transit construction disruption

active light rail expansion through West Seattle, Ballard, and the Eastside will affect thousands of properties through the late 2030s. CaveatBuyer's Construction Disruption Forecast maps proximity and timeline.

What should I check before buying a house in Seattle?

Before buying in Seattle, check for earthquake liquefaction zones, landslide-prone slopes, FEMA flood zones, sewer lateral condition, environmental contamination history, and building era risks like knob-and-tube wiring in pre-1950 homes. CaveatBuyer's free Foundation Report covers all of these from 50+ public data sources. The paid Intelligence Report adds proprietary analysis including Insurance Difficulty Score, Flip Detection, and Sewer Failure Risk.

How do I check if a Seattle property is in a flood zone?

CaveatBuyer checks every Seattle-area property against the FEMA National Flood Hazard Layer (NFHL) and King County's landslide, steep slope, and liquefaction hazard maps. Enter any address at caveatbuyer.com to see flood zone status, plus 40+ additional risk factors, in under 2 minutes.

What are common issues with older homes in Seattle?

Pre-1940 Seattle homes commonly have knob-and-tube wiring, cast iron drain pipes nearing end of life, lead paint, and original plaster walls concealing outdated systems. Homes from the 1940s-1960s often have asbestos insulation, galvanized steel water pipes prone to corrosion, and oil-fired heating systems with potential buried tanks. CaveatBuyer's Building Code Knowledge Graph infers likely building systems from construction era and flags insurance and safety implications.

Is earthquake risk a concern for Seattle homebuyers?

Yes. Seattle sits in a seismically active region with multiple fault lines. Specific neighborhoods — particularly fill areas near the Duwamish River, parts of SoDo, Pioneer Square, and waterfront areas — are in liquefaction susceptibility zones where soil can lose structural integrity during an earthquake. CaveatBuyer maps every property against King County's liquefaction layers and WA DNR's statewide geology data to identify seismic risk.

How much does a CaveatBuyer property report cost?

CaveatBuyer's Foundation Report is free — it includes all findings from public data sources like county assessor records, permit histories, FEMA flood maps, and environmental databases. The full Intelligence Report costs $49 and adds CaveatBuyer's proprietary analysis: Insurance Difficulty Score, Flip Detection, Renovation Completeness, Construction Disruption Forecast, and more. No subscription required.