Zillow's 'iBuying' Algorithms Overpaid For Homes

After investing more than $1 billion in buying homes over the last few years, Zillow has ended its 'iBuying' experiment as anticipated profits fail to materialize.

1 minute read

November 8, 2021, 8:00 AM PST

By Diana Ionescu @aworkoffiction


Masks and Home Sales

My Agency / Shutterstock

Kim Velsey assesses Zillow's failed 'iBuying' experiment, a $1-billion venture that saw the real estate giant buying thousands of homes using algorithm-based decisions in the hopes of flipping them for a profit. In the latest twist in the saga, the company has now suspended the program, which did not accurately predict house value appreciation.

According to Zillow chief executive Rich Barton, "the unpredictability in forecasting home prices far exceeds what [the company] anticipated," making the program a much riskier investment than previously thought. Its aggressive buying algorithms led to the company overpaying for properties, Velsey says, while materials shortages and price spikes made renovations more expensive. Consequently, "flips became flops: Zillow listed 66 percent of homes for prices below what it paid for them, with an average discount of 4.5 percent, according to an analysis of 650 Zillow homes by KeyBanc Capital markets," writes Velsey.

Zillow's biggest mistake, argues Velsey, "was not realizing that as much as people love house hunting on Zillow, when it comes to actually buying and selling properties, real estate remains very much an in-person business." Although housing prices continue to rise and automation is gaining steam in other industries, it is unclear that real estate buyers and sellers are unhappy with the traditional model.

Thursday, November 4, 2021 in Curbed

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

July 2, 2025 - Diana Ionescu

White and purple sign for Slow Street in San Francisco, California with people crossing crosswalk.

San Francisco Suspends Traffic Calming Amidst Record Deaths

Citing “a challenging fiscal landscape,” the city will cease the program on the heels of 42 traffic deaths, including 24 pedestrians.

July 1, 2025 - KQED

Google street view image of strip mall in suburban Duncanville, Texas.

Adaptive Reuse Will Create Housing in a Suburban Texas Strip Mall

A developer is reimagining a strip mall property as a mixed-use complex with housing and retail.

July 6 - Parking Reform Network

Blue tarps covering tents set up by unhoused people along chain link fence on concrete sidewalk.

Study: Anti-Homelessness Laws Don’t Work

Research shows that punitive measures that criminalized unhoused people don’t help reduce homelessness.

July 6 - Next City

Aerial tram moving along cable in hilly area in Medellin, Colombia.

In U.S., Urban Gondolas Face Uphill Battle

Cities in Latin America and Europe have embraced aerial transitways — AKA gondolas — as sustainable, convenient urban transport, especially in tricky geographies. American cities have yet to catch up.

July 6 - InTransition Magazine