Zillow Says My House Is Worth More. Is Zillow Right?

by Moataz (Mo) Elshamy

Before You Price Your Home Based on a Zestimate, Read This First

One of the first things many homeowners do before selling is type their address into Zillow.

Then they call me and say:

"Mo, Zillow says my house is worth $1,050,000."

My answer is always the same:

"That's a data point, not a price."

Sometimes Zillow is surprisingly close.

Sometimes it's off by tens or even hundreds of thousands of dollars.

The real question isn't whether Zillow is "good" or "bad."

The real question is:

Should you trust an automated estimate when one of your largest financial assets is at stake?

What Is a Zillow Zestimate?

A Zestimate is an Automated Valuation Model (AVM).

It uses public records, recent sales, property characteristics, and computer algorithms to estimate a home's value.

It's fast.

It's convenient.

But it has one major limitation:

It can't walk through your front door.

Why Can Zillow Be Wrong?

Your home's value isn't determined by data alone.

Things Zillow often cannot accurately evaluate include:

Interior condition
Quality of renovations
Functional layout
Natural light
Views
Traffic noise
Deferred maintenance
Craftsmanship
Pride of ownership
Buyer demand at that exact moment

A computer doesn't know whether your kitchen was beautifully renovated or hasn't been updated in 35 years.

It doesn't know if your basement smells musty.

It doesn't know if your backyard backs up to a busy road.

Those things matter.

My House Has Thousands of Dollars in Upgrades. Doesn't That Automatically Increase Its Value?

Not necessarily.

This is one of the biggest misconceptions I see.

I've met sellers who proudly tell me:

"I spent $80,000 on improvements."

That's great.

But buyers don't reimburse every dollar you spend.

They pay for the value they believe they're receiving.

I once met a seller who invested heavily in an above-ground pool.

He expected buyers to pay more because of it.

Many buyers asked me one question:

"Can it be removed?"

Meanwhile, the outdated kitchen was the first thing buyers noticed.

That's where the money would have made a much bigger difference.

Then How Is My Home Really Valued?

A professional Comparative Market Analysis (CMA) isn't just about comparing square footage.

It considers:

Recent comparable sales
Active competition
Pending sales
Location within the neighborhood
School district
Lot characteristics
Condition
Updates
Buyer demand
Current market trends

It's part science.

Part experience.

Part market interpretation.

Who Really Determines My Home's Value?

This is something I tell every seller.

Your home isn't worth:

What Zillow says.
What you hope it's worth.
Even what I think it's worth.

It's worth what a qualified buyer is willing to pay in today's market.

That's the market.

Why Did My Zestimate Change Overnight?

Many homeowners are surprised when their Zestimate jumps—or drops—without any changes to the home.

That usually happens because:

A nearby home sold.
Market conditions shifted.
Zillow updated its algorithm.
New public records became available.

It doesn't necessarily mean your home's true market value changed by that amount overnight.

Should I Price My House Based on Zillow?

No.

Use Zillow as a starting point—not the final answer.

Pricing a home correctly requires more than an algorithm.

The right price attracts buyers.

The wrong price can cost you months on the market and thousands of dollars.

A Lesson From Zillow Itself

Even Zillow has acknowledged that automated estimates have limitations.

Years ago, the Zestimate for the former Zillow CEO's own home differed significantly from its eventual sale price, becoming a widely discussed example of why automated estimates aren't perfect.

That doesn't make Zillow useless.

It simply reminds us that no algorithm can replace a professional evaluation and current market analysis.

Final Thoughts

Technology is an incredible tool.

I use technology every day.

But when it comes to pricing one of your biggest assets, there's no substitute for professional judgment, local market knowledge, and experience.

Use online estimates to start the conversation.

Not to end it.

Thinking About Selling Your Long Island Home?

Wondering what your home is really worth—not just what an algorithm says?

I'd be happy to prepare a professional market analysis tailored to your home, your neighborhood, and today's market.

📱 Call or text Mo The Realtor for a no-obligation consultation.