Why is my Zestimate too low?

A low Zestimate isn't cosmetic. It's the number a buyer sees first, the figure your neighbor repeats, and the anchor an agent has to argue against. If it's running below your home's real market tier, that gap can cost you real money at the worst possible moment — when you list.

The usual suspects

• Wrong facts on file — understated square footage, a missing bedroom or bathroom, wrong lot size. The most common and most fixable cause.
• Invisible improvements — a renovated kitchen, finished basement, or addition the model has no way to see.
• Out-of-town comps — sales pulled from a cheaper neighboring municipality, dragging your estimate toward their market. More on cross-town comp drag →
• A low recent sale nearby — one distressed or odd sale can anchor the model below trend.
• Thin data or a silent model update — fewer true comps, or a region-wide repricing you were never told about.

How to diagnose yours

1. Claim your home and audit every recorded fact. Fix anything wrong — this alone resolves a surprising share of low estimates.
2. Build a list of 4–6 genuine comps inside your own municipality. If they cluster well above your Zestimate, the model is likely leaning on the wrong sales.
3. Check other AVMs. If Redfin and Realtor.com sit higher and only Zillow is low, that points to Zillow-specific data, not your market.
4. Scan your Zestimate history for the moment it diverged — that timestamp usually fingerprints the cause.

How to push it back up

• Correct the facts and add high-quality photos that show true condition.
• Document your same-municipality comps and the out-of-town sales you believe are dragging you.
• Report data errors to Zillow and keep a clean evidence sheet for buyers and agents.

The full method is in the step-by-step correction guide. If you'd rather see the whole picture at once, an audit will tell you which of these is actually hurting you.