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Zestimate Takes Logical Step Into AI

Zestimate Takes Logical Step Into AI

Zillow recently announced accuracy improvements for off-market Zestimates, which will now utilize neural networks to generate valuations. We believe historically the majority of the Zestimate used algorithms that were designed by data scientists. These algorithms are static in nature and therefore, have difficulty keeping pace with a hot housing market. Neural networks are essentially algorithms that have the ability to dynamically create new algorithms on their own, hence the phrase machine learning. The bottom line is the new Zestimate should be more accurate because it will be more agile.

Initially, Zillow has reported modest improvements in accuracy from switching to neural network-based outcomes. What’s more important than the initial accuracy gains is that Zillow has just put AI on the clock, given we can now timestamp the Zestimate’s accuracy pre and post addition of the neural network. If history repeats itself, we should see measurable improvements in the Zestimate’s accuracy over the next two years.

Zestimate accuracy inches forward

As a reminder, there are two flavors of the Zestimate: on and off-market. Off-market Zestimates are the most important Zestimate for the success of Zillow 2.0 because the majority of live Zestimate cash offers will go to homeowners whose homes are not on the market. While sellers who have already listed their home could pivot and sell to Zillow Offers, they would likely have to navigate a listing agent contract, which we view as unlikely.

The off-market Zestimate median error rate is now 6.9%, compared to 7.8% previously. In plain English, this means 50% of the 104m off-market Zestimates are accurate within +/- 6.9% of a home’s eventual sale price. The other 50% fall outside of this +/- 6.9% range. In short, the off-market Zestimate is still unpredictable and has a long way to go. That said, the important thing is that it’s getting better, which we believe is important for three reasons:

  1. Expands live Zestimate buybox. The tangible result of the Zestimate improvement is that the pool of eligible homes for a live Zestimate offer will “likely increase by 30%” from 900k to roughly 1.2m (a fraction of the ~105m off-market homes in the US). Increasing the box of addressable homes is key for acquiring inventory, something Zillow struggled to do in the March quarter, which led them to guide Homes revenue for the June quarter about 10% lower than expectations. The more homeowners that see a live Zestimate and the more accurate it is should increase seller leads and conversion, leading to more inventory.
  2. Builds trust with consumers. The reason a more accurate Zestimate builds trust is because pricing transparency is core to the iBuying experience, given homeowners initially anchor their decision to sell based on price. If the live Zestimate undershoots, Zillow won’t build inventory. Regardless of whether it’s a machine or a human, if you bid too low, you’re not going to get the house. If the initial live Zestimate overshoots and the company must materially lower its final cash offer after an in-person inspection, consumer trust will erode.
  3. Maintaining its lead in search. The Zestimate helps Zillow control of the top of the real estate search and discovery funnel because the Zillow surfing phenomenon is rooted in people’s curiosity to know the value of their dream home or their neighbor’s. The more accurate the Zestimate, the more valuable it is to users. Maintaining control of the top of the search funnel is important for Zillow 2.0 because it provides a huge organic audience (220m monthly visitors) to which the company can advertise its iBuyer offerings at no added cost. Over time, this marketing cost advantage should translate into better margins for Zillow and better offers to home sellers, leading to more inventory and selection for home buyers, driving the flywheel.

Putting it together, Zestimate accuracy is a key piece in Zillow’s iBuying puzzle. We are long-term believers in the power of AI and believe that machines will eventually be capable of consistently appraising the value of a home better than humans.


Opendoor, Zillow
3 min. read Show less
Real Estate Disruption Landscape

Real Estate Disruption Landscape

A number of companies are going after the opportunity to disrupt residential real estate – Zillow, Opendoor, Redfin, Offerpad, Compass, Homeward, and Porch, to name a few. The reason is that residential real estate is 1) a massive, fragmented market with around 5.5m home transactions annually, triggering an exchange of around $2T in value, and 2) full of friction because digital offerings today are nascent. For perspective, iBuying accounts for less than 1% of all home transactions today, and tech-powered brokerages such as Redfin and Compass have less than 5% share of transaction volumes.

The unifying thread among new entrants is an attempt to bring liquidity and reduce friction in the home transaction and ultimately, the moving process. That said, the opportunity is being approached through a spectrum of strategies. In our opinion, iBuying platforms have the potential to be the most transformative. That’s because they’re solving the most difficult problem – using machines to price and purchase homes directly from consumers – along with building a platform to streamline all activities around moving to provide a one-stop digital shop to buy and sell. Given the size of the TAM, other tech-powered approaches from brokerages like Redfin and Compass and alternative home financing companies such as Homeward will continue to grow as they help improve home transaction efficiency.

Below we outline the landscape of companies addressing the residential real estate opportunity. We’ve segmented them into three categories: iBuyers, tech-powered brokerages, and alternative home financing companies.

  1. iBuyers – The three largest iBuyers are Opendoor, Zillow and Offerpad. Although Zillow has its legacy ad business, the company has been clear that its focus with Zillow 2.0 is buying and selling homes. iBuyers purchase and sell homes directly to consumers. They generate revenue from a service fee that sellers pay in exchange for the certainty of an all-cash offer, the time certainty of choosing a closing date, along with the convenience of not having to repair, stage, or show the house. They also earn revenue from any home price appreciation when they sell a home. In the first quarter of 2021, Opendoor held roughly 56% of iBuying purchases, followed by Zillow at 29% and Offerpad at about 15%. Today, Opendoor has been more aggressive in acquiring inventory which has benefited its share. Long-term, we see the iBuying leadership concentrating between Zillow and Opendoor. The basic question is whether Opendoor continues to pay up for homes while growing its brand. For Zillow, its future is dependent on the company’s ability to convert its top-of-the-funnel leadership today (221m unique users in the March 2021 quarter), improve the accuracy of the Zestimate, and convert browsers into sellers.
  2. Tech-powered brokerages – Redfin and Compass are examples of tech-powered brokerages which leverage software to transact homes faster (while Redfin has a very small iBuying arm (RedfinNow), it’s not the company’s focus). In the case of Redfin, these efficiencies are passed on to home buyers and sellers in the form of discounted agent fees. We view Redfin as the digital broker for everyone, with an average home transaction value of about $490,000 in 2020. For Compass, the goal is to equip agents with better technology to buy and sell more homes, earning them more in commissions. We view Compass as the digital broker for people with more expensive homes, with an average home transaction value of just over $1m in Q1 2021. While there is value to be captured in these approaches, fundamentally they don’t change the nature of home transactions. Agents and commissions are still front and center.
  3. Alternative Home Financiers – Three of the primary players in this space, all private companies, are Knock, Orchard, and Homeward. While their offerings vary slightly, they focus on a “Buy Now Sell Later” option, by which homeowners can unlock equity in their existing home to purchase a new home, and then sell their previous home after the fact (in essence, it’s a bridge loan). Many of these companies will also back buyers’ offers with their own cash, essentially turning into an all-cash offer. From a high level, these offerings help solve 1) the timing issue of buying and selling a home while avoiding double moves and overlapping mortgages, and 2) makes buyers more competitive because their offers are not contingent on securing financing or the sale of their existing home. Similar to tech-powered brokerages, while these companies are solving some paint points, we don’t see them disrupting the fundamental mechanics of home transactions like iBuyers.
  4. Everything in between – In between the discovery, financing, buying, and selling, is a checklist of smaller tasks and services that are part of every move. These include finding insurance, movers, and handymen for repairs and installation, as well as transferring internet/tv, and security systems providers to a new location. Porch’s business model is essentially lead generation around what are five components of a move. From a consumer standpoint, Porch removes the headache of finding these components, and from a service provider’s perspective, they give access to high-intent customers.

iBuying represents the biggest opportunity

We believe the iBuying is the category of the real estate landscape with the largest opportunity. One of the core challenges for iBuyers to solve is using machines to accurately price and purchase homes at scale. The fundamental question is whether a machine will eventually be capable of consistently appraising the value of a home better than humans. We are long-term believers in the power of AI, and see appraising home values as a wheelhouse machine learning use case. The bigger the problem, the greater the potential reward.

Bringing it together

We’ve outlined 9 companies that are tracking the real estate disruption opportunity. Long-term, the most frictionless process will be when a customer can sell, buy, finance, insure, renovate and move using the same company. In other words, bringing the disparate parts of a real estate transaction under the same roof. We believe this anchor point will be iBuyers, as they are already tackling the most difficult problem of pricing and purchasing homes at scale. Today, the three iBuyers mentioned above offer mortgage and closing services, and in the future, we expect they will bolt on or build out additional ancillary services. This is where seamless transactions and true liquidity will arrive, along with a superior consumer experience and value proposition.


Opendoor, Zillow
4 min. read Show less