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

Get top-rated, practical training

High-rise apartment buildings in Waikiki, Hawaii with steep green mountains in background.

Study: Maui’s Plan to Convert Vacation Rentals to Long-Term Housing Could Cause Nearly $1 Billion Economic Loss

The plan would reduce visitor accommodation by 25,% resulting in 1,900 jobs lost.

April 6, 2025 - Honolulu Civil Beat

Two yellow and white Dallas Area Rapid Transit light rail streetcars at station in Dallas, Texas.

North Texas Transit Leaders Tout Benefits of TOD for Growing Region

At a summit focused on transit-oriented development, policymakers discussed how North Texas’ expanded light rail system can serve as a tool for economic growth.

April 3, 2025 - KERA News

Blue and white Seattle Link light rail train exiting concrete Downtown Bellevue Tunnel in Bellevue, WA.

Why Should We Subsidize Public Transportation?

Many public transit agencies face financial stress due to rising costs, declining fare revenue, and declining subsidies. Transit advocates must provide a strong business case for increasing public transit funding.

April 7, 2025 - Todd Litman

Amtrak Acela

How to Make US Trains Faster

Changes to boarding platforms and a switch to electric trains could improve U.S. passenger rail service without the added cost of high-speed rail.

2 hours ago - Bloomberg CityLab

Mural showing tools and craft supplies with banner reading 'Things are made here' in front of makerspace in Columbia, Missouri.

Columbia’s Revitalized ‘Loop’ Is a Hub for Local Entrepreneurs

A focus on small businesses is helping a commercial corridor in Columbia, Missouri thrive.

3 hours ago - Next City

Close-up of wood log with emerald ash borer larvae tracks etched in the wood.

Invasive Insect Threatens Minnesota’s Ash Forests

The Emerald Ash Borer is a rapidly spreading invasive pest threatening Minnesota’s ash trees, and homeowners are encouraged to plant diverse replacement species, avoid moving ash firewood, and monitor for signs of infestation.

4 hours ago - The Bemidji Pioneer