Why Castaic's Median Home Price and Its Price Per Square Foot Are Moving in Opposite Directions
Open a market report for Castaic this month and you'll find two numbers that shouldn't coexist. The median list price is up. The price per square foot is down. Read that twice if you need to. Both are true, in the same market, in the same month, and neither one is a typo.
If you're comparing Castaic to other corners of the Santa Clarita Valley, or trying to figure out what your own home is actually worth right now, that contradiction matters more than either number on its own. It means the "market" you're reading about on a portal homepage is really two markets stitched together, and knowing which one you're standing in changes what you should expect at the negotiating table.
As of September 2026, Movoto's listing data put Castaic's median asking price at roughly $930,000, up about 8 percent from a year earlier. In the same snapshot, the median price per square foot sat at $370, down 4 percent year over year. Closed-sale data from Redfin tells a version of the same story from a different angle: in February 2026, the median sale price was $863,000, up 5.5 percent from the year before, while the price per square foot was $402, down 3.4 percent over that same stretch.
Two different data providers, two different measures of price, and the same shape both times. Price climbing. Cost per square foot falling. That's not noise from one site's methodology. It's a pattern showing up on both the listing side and the closed-sale side.
Zoom out to a single week and the variance gets even more visible. A separate snapshot from early September 2026 showed 57 active Castaic listings averaging $410.55 per square foot with a median list price near $888,000, which lands close to Movoto's figure but with a noticeably different per-square-foot read. None of these sites are wrong. They're each drawing from a slightly different slice of what's actively for sale at that exact hour, and that slice is exactly what determines the headline number.
Days on market tell a consistent story underneath all of this. Redfin's February 2026 data showed Castaic homes taking an average of 64 days to sell, up from 49 days the year before. A market where prices are rising and homes are taking longer to sell isn't behaving like a typical seller's market. It's behaving like a market absorbing a wave of new supply that buyers are still sorting through.
The supply doing the sorting has a name: Williams Ranch. Built by Williams Homes, a builder founded by Lance and Sadie Williams in Santa Clarita, Williams Ranch is a 430-acre master-planned community going up in Castaic's Hasley Canyon, with 497 single-family homes planned at full build-out. That build-out isn't expected to finish until 2030, which means new inventory from this single project will keep entering the Castaic sales count for years.
The homes themselves run large. Lots range from roughly 7,000 to 23,000 square feet, well above the typical Castaic parcel, and homes sit anywhere from about 2,200 to just over 4,200 square feet depending on the floor plan. Pricing spans roughly $899,000 to $1.45 million. Planned amenities include a recreation center with a pool and spa, an amphitheater, and neighborhood parks woven between citrus orchards and working vineyards, with a wine pavilion planned as a gathering spot.
Here's the part that explains the paradox. A $1.2 million home on a 4,100 square foot floor plan sounds expensive, and it is, but on a per-square-foot basis it can actually land below a smaller, older home nearby that's asking a premium for scarcity. Add enough of these large new homes to the sales mix and the median price rises because the typical home changing hands is simply bigger and more expensive in absolute terms. The price per square foot falls or holds flat because size, not finish quality or land value, is doing most of the work.
One more detail matters if you're comparing Williams Ranch against resale: homes there carry a special tax rate of roughly 1.51 percent, layered on top of standard property tax, to fund the community's infrastructure and services. That's a real ongoing cost, and it changes the true monthly comparison between a new-construction home and an older resale that doesn't carry the same assessment.
While Williams Ranch pulls the median in one direction, Castaic's established tracts are trading closer to where they've always traded, and the variance between them is worth seeing in actual numbers.
A recent listing in Camino del Lago asked $600,000 for 1,932 square feet, which works out to about $310 per square foot. A smaller home in Hillgate, at 1,284 square feet, asked $699,900, or roughly $545 per square foot, likely reflecting a recent renovation or a smaller, higher-demand floor plan. A four-bedroom in the Cambridge Collection asked $899,000 for 2,772 square feet, landing near $324 per square foot. At the top end, a home in Wild Horse asked $2.5 million and sat on the market for 75 days, well above the citywide average, suggesting that even strong demand for space has a ceiling once price climbs high enough.
Older, established pockets like Sulphur Springs continue to anchor the more affordable end of Castaic's resale stock, alongside manufactured-home communities such as Lakehills Estates and Hasley Canyon Mobile Estates, which serve a different buyer entirely than either the new master-planned tracts or the hillside custom lots.
The spread here, from roughly $310 to $545 per square foot within blocks of each other, is the real texture hiding underneath any single citywide median. Castaic's average home size, at 3,284 square feet, already runs well above the county average of 2,989 square feet. Add hundreds of new, even larger homes to that mix and the citywide number stops describing any specific neighborhood at all.
For a buyer weighing a Williams Ranch home against something in an older tract, the sticker price is the least useful comparison you can make. Two homes at the same price can carry very different monthly costs once you factor in the 1.51 percent special tax on new construction against whatever HOA or lower base tax rate applies to an established resale. Lot size cuts the other way. Williams Ranch parcels run from 7,000 to 23,000 square feet, larger than what most older Castaic tracts offer, which is part of what buyers are paying for even when the per-square-foot number looks reasonable.
Financing terms differ too. Williams Ranch homes are eligible for VA and FHA financing, which matters if you're weighing loan programs, while some manufactured-home communities in older parts of Castaic use different financing structures entirely.
If your home sits in Sulphur Springs, Hillgate, or any of Castaic's older tracts, the citywide median climbing past $900,000 can create a false sense of what your specific home should list for. The number moving is describing a different kind of house than yours. Days on market data from Redfin showing homes taking 64 days to sell in February 2026, up from 49 the year before, suggests buyers are taking longer to compare options across a wider range of price points and home sizes than they used to.
The more reliable comparison is your tract's own recent per-square-foot sales, not the blended citywide figure. A buyer's agent representing a serious offer will be doing that same math, and a listing priced off the wrong benchmark tends to sit exactly as long as the data above suggests.
Does a rising median price mean my Castaic home appreciated this year? Not automatically. The median reflects whatever mix of homes sold or listed during that period, and a wave of new, larger construction can push it up even when your specific tract's per-square-foot value hasn't moved. Pull recent sales from your own neighborhood before assuming the citywide number applies to you.
Is the special tax on new Williams Ranch homes a reason to avoid the community? Not on its own. Special tax rates are standard for large master-planned communities and fund infrastructure the community itself relies on. The number to focus on is the total monthly cost, tax included, compared honestly against what an older resale would actually cost you to carry each month.
Numbers like these are easy to misread from a portal homepage and much harder to misread once you know which tract, which lot size, and which special assessments are behind them. If you're weighing a move into Castaic, sizing up a Williams Ranch floor plan against an established tract, or trying to price a home you already own here, Kramer Cruz Group can walk through the actual comps behind the headline number with you. Schedule a consultation and let's look at what your specific street is really telling you.
Whether you're in the research phase at the beginning of your real estate search or you know exactly what you're looking for, you'll benefit from having a real estate professional by your side. She'd be honored to put her real estate experience to work for you.