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

Young Professional

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 and Environmental 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 and Environmental Planner

Get top-rated, practical training for planners

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

The Hoover Dam blocking the Colorado River. The river's water level is noticeably low. The cliffs surrounding the blue water are brown and jagged.

US to reduce Colorado River water deliveries to Mexico

A new Colorado Treaty amendment reduces Mexico’s Colorado River water allocation by 250,000 acre feet.

September 11, 2026 - The Arizona Republic

Skyscrapers in Jersey City.

New Jersey’s second-largest city bans standalone data centers

Jersey City will continue to allow co-location facilities, such as those meant for research institutions that store their own data.

September 4, 2026 - The Cool Down

A New Jersey train approaches people waiting at the station.

Amtrak not solely to blame for New Jersey commuter rail's unreliability, report finds

A new study from the Garden State Initiative found that NJ Transit’s budget grew 20% across a 4 year period, but reliability declined significantly over the same period.

September 15 - Mass Transit

A tall, gray power plant billows smoke into a blue sky.

EPA erases limits on planet-warming pollution from power plants

Under Monday’s plan, power plants would still have some limits on how much mercury, arsenic and other contaminants they can emit.

September 15 - New York Times

A white RAPID bus. The lower half is light blue, and says RAPID in purple text. The bus is half visible, appearing from the left side of the image.

Phoenix announces new on-demand transit service, more frequent RAPID buses

Both new services will launch in October, and are part of Phoenix's Project Effective Access Solutions for Easing Congestion.

September 15 - KJZZ

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.