An interactive “Sunscore” visualization on Redfin shows the path of sunlight on GeekWire’s offices in Seattle. (Image via Redfin)

What’s it take to be a neighbor with a sunny disposition? Perhaps more sunlight, for starters.

Seattle-based real estate brokerage Redfin launched “Sunscore” on Monday, a new interactive feature that lets home searchers see how much natural light a property receives throughout the day.

The 3D map offers a property-level sun-path visualization, tracking sunlight and the shadows cast by surrounding terrain, buildings and trees. Different times of day and times of the year are analyzed to provide a full picture of potential shadows. Properties are scored 0-100 — the more sunlight, the higher the score.

“We know from customer feedback that sunlight is a priority for house hunters,” said Ariel Dos Santos, Redfin’s chief product and design officer, in a news release. “When you tour a home, you want to see brightly lit spaces with natural light pouring through windows. Sunscore gives home searchers that information upfront in a simple-to-understand way.”

A recent Redfin survey found that nearly 70% of people say the amount of sunlight in their home affects their satisfaction with their living situation, and 11% say it’s non-negotiable when searching for a home.

And the amount of light a home receives isn’t just a mood-booster or an aesthetic factor; the score on property-level sunlight can be also help homeowners measure the potential for solar energy and long-term cost savings.

Sunscore is developed by Austria-based Shadowmap, and the partnership with Redfin-owned Rocket is a U.S. exclusive. The feature is now available on all for-sale homes listed on Redfin.com and will be available on Redfin’s iPhone and Android apps later this year.

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