Helping homeowners understand their home value on Zillow

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Zillow is the leading real-estate and rentals marketplace for consumers in America. The company aims to empower people through data and insights to help them find a home they love.

The challenge was to redesign the comparable market analysis tool (CMA tool, for short), to be more user friendly and help homeowners feel more confident about the market value of the home.

The outcome of the redesign was that homeowners who used the tool felt that they had more control in estimating their home value and had greater trust in the Zestimate (Zillow’s automated home value estimate).

How to see the design in action:

Find your home on Zillow > click the “Owner View” tab > scroll down to the Comparable Homes Analysis tool


The former Comparable Homes tool struggled with several usability issues

User feedback indicated that people found that the flow was unintuitive. There was also an opportunity to update the feature to use the new design patterns and be usable on mobile screens.

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How might we simplify the process for generating a Comparable Market Analysis?

The old model involved several steps and only provided the estimated home value at the very end of the flow. What if we condensed the steps and gave immediate feedback on how a chosen comparable home affects the estimated value?

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The mobile design flow ended up being slightly more complex due to screen size constraints.

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Users trust the Comparable Homes tool’s estimate more

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To test the design, 12 homeowners from used the tool on both desktop and mobile. Overall, users appreciated the level of control, which increased their trust.

There were a couple people who thought their Zestimate was low, but after going through the tool, they trusted the Zestimate more.

Trust decreased when they were presented comparable homes with missing photos and missing data.


Reduce, reuse, and recycle

While working through the interaction details for the tool, it was very tempting to create custom modules and elements. However, while working with the Design Systems team, I found that there were actually many existing patterns I could reuse or adapt slightly and still meet requirements.

We also identified many other challenges to focus on for later, such as:

  • How might we help homeowners created an unbiased assessment of their home value? (It is easy to pick all the higher value comparable homes to artificially inflate your home value estimate)

  • How might we adapt this tool to benefit home shoppers who are evaluating how much to offer on a home?

Frances Tung