Black Diamond, WA Housing Market 2026: Median Home Price, Last 12 Months

If you invest in or around Black Diamond, the number that matters is what homes actually close for, not what sellers are asking. Here is what Black Diamond sale prices look like right now, built from the closings Resideline tracked over the last 12 months, as of October 2026.

The snapshot

• •Closings tracked, last 12 months: 230
• •Median sold price, last 12 months: $733,750
• •Median sold $/sqft, last 12 months: $346
• •Middle half of sales closed between: $579,950 and $829,950

What the numbers say

Resideline tracked 230 closed sales in Black Diamond over the last 12 months, with a median closing price of $733,750. That median is the midpoint of what buyers actually paid, not what sellers hoped to get, which is why it moves differently from the asking prices you see on listing sites. The middle half of those sales closed between $579,950 and $829,950. That spread matters more than the headline median: where a specific property sits inside it decides whether the citywide number helps you or misleads you. These are the closings Resideline tracks and may differ from complete county or municipal records. 83% of the Black Diamond closings we track here are single-family houses, so these figures primarily reflect that segment, and the citywide $/sqft figure primarily reflects that segment as well. Across the 230 closings with usable living area, the middle half sold between $305 and $476 per square foot.

Figures last updated November 6, 2026 from closings Resideline tracked.

Median home price in Black Diamond, WA (October 2026)

The median home price in Black Diamond is $733,750, measured across the 230 closed sales Resideline tracked over the last 12 months. The middle half of those sales closed between $579,950 and $829,950.

Where Black Diamond sale prices land

Medians hide the shape of a market. The distribution above covers the closed sales Resideline tracked in Black Diamond over the last 12 months that carry a usable sale date, trimmed to the 5th through 95th percentile, with the middle half of sales closing between $579,950 and $829,950. Among the 74 Washington markets with a published band, Black Diamond's middle-half spread ($579,950 to $829,950) ranks 21st from the narrowest. Where your target property sits inside that spread matters more than the citywide median. Measured as the ratio of the upper to the lower quartile, its middle-half spread ranks in the 15th percentile of the 2,291 US markets in Resideline's national Market Watch set, on data as of November 3, 2026.

How long a sale takes here

• •Listed to under contract: a median of 24 days, across 124 Black Diamond closings Resideline tracked in the last 12 months
• •Contract to closing: a median of 32 days, across 157 Black Diamond closings Resideline tracked in the last 12 months

Both are measured from the closings themselves, not from listing inventory. Each sale is timed using its own listing and contract dates. That is why these counts are smaller than the 230 closings above: a sale is counted here only when we hold both of its dates.

The Black Diamond angle

Black Diamond returned 230 tracked closings over the last 12 months, a median closed sale price of $733,750, and a middle half between $579,950 and $829,950. The band is tighter than most markets we track, so closings here sit closer to one another than they do in most places we cover and the median means more than it usually does. The question to answer is not what the market is worth but whether your subject is a normal Black Diamond sale, because in a clustered market an exception stands out quickly and has to be argued for.

From market read to offer price

A market read is the backdrop. The decision still comes down to one property and one number: what it is actually worth and what you should pay. Every Resideline report opens with this same market snapshot for the subject's exact ZIP code, then gives you the property's value, the sold comps behind it, and a market rent estimate. Pricing a specific deal? The free ARV calculator, rehab cost estimator, BRRRR calculator and rental property calculator run the numbers in about a minute.

And we show our work. Every estimate is frozen while the home is for sale and graded against the real closing price after it sells. See the live accuracy dashboard for the receipts, or read how the Area Market Snapshot works.

Run any Black Diamond address through Resideline and you will see the local market and the property's value together, in one report.

Cite this

Using these numbers? Please cite the source and the sample size:

Source: Resideline Market Watch
Market: Black Diamond, WA
Geography: incorporated municipality, Census place 5306330
Data updated: October 2026
Analysis period: last 12 months
Tracked closings: 230
Median sold price: $733,750
Median sold $/sqft: $346 (230 qualifying)
Property mix: 83% houses
https://resideline.com/blog/black-diamond-wa-housing-market

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<a href="https://resideline.com/blog/black-diamond-wa-housing-market">
  <img src="https://resideline.com/images/embed/black-diamond-wa.png" alt="Black Diamond, WA home sale price distribution, last 12 months" width="1000" style="max-width:100%;height:auto">
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<p>Source: <a href="https://resideline.com/blog/black-diamond-wa-housing-market">Resideline Market Watch</a></p>

The local market statistics in this report are calculated from closed sales tracked by Resideline. Transaction coverage may differ from complete county or municipal records.

Every local market figure on this page is computed from closed sales Resideline tracked in Black Diamond over the last 12 months, and is refreshed when the data is.