Navigating Washington Mortgage Rates Amidst Rising Seattle Housing Inventory

The combination — rates above the 7% threshold crossed earlier this month and a widening gap between new supply and signed contracts — is the core data point for any buyer or seller operating in the Puget Sound market right now.

The supply-demand math in Seattle

HousingWire's six-week window (July 17 through August 21) gives the cleanest read on the imbalance. In the Seattle metro, the ratio of new pending sales to new listings ran at roughly 81 to 100, down from 96 to 100 a year earlier. The two components moved in opposite directions:

• New listings: +7.2% year over year
• New pending sales: −9.3% year over year
• Active single-family inventory: 7,927 homes on July 17 → 8,510 on August 28
• Median days on market: 42 → 56 across the same period

The pending-to-listings ratio is the more diagnostic metric. Active inventory tells you how much supply has accumulated; the ratio tells you whether today's buyers are keeping pace with what is arriving today. Seattle's 81-to-100 reading sits behind the national figure (96 to 100, versus 98 a year earlier), confirming what KIMT's reporting describes as a market that is, in price terms, shifting toward buyers — even if the buyers themselves don't feel the shift yet.

Calendar note and forward read

A calendar distortion applies to the latest weekly prints. Labor Day fell on September 7 this year versus September 1 in 2025, which makes a clean year-over-year comparison for the week ending September 11 unreliable. The six-week window used above sidesteps the issue by averaging across the distortion.

The underlying mechanic is straightforward: if new pending sales consistently trail new listings for more than a week or two, inventory builds as more homes come to market than buyers put under contract. If pendings catch up, the rate-driven slowdown reads as a seasonal pause rather than a rebalance.

For Seattle, the binary projection is this. If the pending-to-listings ratio stays below 85 through October, median price compression in the single-family segment becomes the base case for the metro's end-of-year data. If the ratio recovers to 90 or above alongside any relief in the 7.22% rate environment, the inventory build gets absorbed and the 2026 closing curve flattens rather than steps down.