King County condo sales fell 24.1% in September compared with a year earlier. The median sale price also declined, leaving fall sellers with good reason to check what comparable units are actually selling for.
In its October 6 update, Northwest Multiple Listing Service reported a September condo median of $496,000, down 6.0% from September 2025. King County condominiums had 7.05 months of inventory.
That inventory figure compares active listings at the end of the month with the number of sales that closed during it. It does not mean a condo will take seven months to sell. Likewise, the lower median describes the homes that sold, rather than a 6% loss in every owner’s property value.
The unit down the hall is a useful starting point
For a seller, recent sales in the same building or complex deserve an early look. Then compare nearby condos with a similar size and layout. Keep asking prices and sold prices separate: one shows what another owner hopes to receive; the other records a completed sale.
The differences need some attention. A parking space, a brighter living room, elevator access or a kitchen that needs work can change how a buyer compares two units. Price per square foot alone will miss those details.
Association dues belong in the comparison, too. Check what each payment covers before assuming the unit with lower dues costs less to own.
Get the building questions answered early
Before listing, ask your broker and association manager which records are needed and how long they take to obtain. The budget, reserve information, insurance, planned projects, assessments and applicable restrictions all deserve a review.
If a project or expense is still under discussion, explain what is known and who can answer the remaining questions. Having that information ready gives a prospective buyer something concrete to review.
Watch what happens after the first showings
Set a date with your broker to review showing activity and feedback. A repeated concern about the asking price, condition or monthly costs is more useful than an isolated comment. Check whether competing units have sold, reduced their prices or come off the market.
When an offer arrives, compare the estimated proceeds after credits and concessions, along with contingencies and the closing date. Those details can matter as much as the offer price when you have another move to make.
Source
Information and statistics compiled and reported by the Northwest Multiple Listing Service. Figures cover King County condominiums in September 2026; annual comparisons are with September 2025. Source: NWMLS market update, October 6, 2026, checked October 9, 2026.
Image: AI-generated editorial illustration of an imagined condominium building; not a property listing.
