Zillow vs. Redfin Estimate: Which Is More Accurate?

Redfin’s home value estimate carries a median error rate of approximately 2.1% for on-market homes, compared to Zillow’s Zestimate at roughly 2.4%, but for off-market properties, Zillow holds a slight accuracy advantage. This on-market versus off-market split is the finding that most redfin vs zillow home value comparisons overlook entirely.

The gap between on-market and off-market accuracy is not a minor footnote. For listed homes, both tools perform in the low 2% error range. For unlisted homes, errors climb to 6% to 7%+, meaning a $500,000 home estimate could be off by $35,000 in either direction.

This guide covers how each platform calculates its estimates, a full zillow zestimate vs redfin estimate comparison table, the on-market and off-market accuracy reversal explained in detail, the most common causes of inaccurate estimates, and a six-step protocol for improving the accuracy of your own home’s estimate.

What are Zillow Zestimate and Redfin Estimate?

Both Zillow and Redfin offer free automated property valuations, but they draw on different data and cover different numbers of homes. Neither platform produces a formal appraisal; both give you a benchmark, not a guarantee.

What is a Zillow Zestimate?

A Zillow Zestimate is an automated valuation model (AVM) that estimates the market value of a home using public records, MLS listings, tax assessments, and user-submitted data. According to Zillow’s Zestimate accuracy stats, the tool covers more than 100 million homes across the United States, making it the broadest free home value estimate available online. The Zestimate is not a formal appraisal and carries no legal or lending standing; it is a starting benchmark for property valuation.

What is a Redfin Estimate?

The Redfin Estimate is also an automated valuation model (AVM), but it draws primarily from MLS data in markets where Redfin operates as a licensed brokerage. According to Redfin’s error rate data, the tool covers more than 40 million homes in Redfin-served markets. Because Redfin has direct MLS access, its algorithm ingests listing data and comparable sales faster than tools relying solely on public records. Like the Zestimate, the Redfin Estimate is not a home appraisal and cannot substitute for one in lending or legal contexts.

How Zillow and Redfin calculate home values

The accuracy difference between the two platforms traces directly to their data sources. Understanding those sources explains why listing status changes which tool performs better.

Zillow data sources and algorithm

Zillow builds its Zestimate from a wide mix of inputs: public records, tax assessments, user-submitted home facts, MLS data, and comparable sales across its full 100M+ home database. This diversity of sources is why Zillow holds a slight edge for off-market homes, where no current listing data exists. The algorithm weights recent nearby sales and listing price history, and it incorporates user-submitted updates that owners enter directly into their Zillow profile.

Redfin’s MLS-based methodology

Redfin’s estimate relies primarily on MLS data, the same dataset licensed real estate agents use. Because Redfin is itself a licensed brokerage, it receives MLS feeds directly rather than waiting for those sales to enter public records. This gives the Redfin Estimate a structural advantage for on-market homes: it sees the most current listing prices and recent closings before that data propagates to other sources. For off-market homes, Redfin falls back on public records and comparable sales, the same inputs Zillow uses, but from a smaller database.

The FHFA AVM quality control guidelines require automated valuation model providers to maintain accuracy testing, quality standards, and nondiscrimination safeguards. Both Zillow and Redfin publish their median error rates voluntarily as a transparency measure.

Update frequency for both platforms

Redfin updates estimates daily for on-market homes and weekly for off-market homes. Zillow updates its Zestimate several times per week for most properties, though the exact cadence varies by region and data availability. For a home that just listed or recently sold, Redfin’s daily on-market update cycle typically reflects new information faster than Zillow’s rolling schedule.

Zillow vs. Redfin: full comparison table

The table below gives a side-by-side view of the zillow zestimate vs redfin estimate across seven key features. The on-market and off-market accuracy rows appear adjacent by design: the reversal between those two scenarios is the single most important fact in any redfin vs zillow home value comparison.

Feature	Zillow Zestimate	Redfin Estimate
On-market median error	~2.4%	~2.1%
Off-market median error	~7.1% to 7.5%	~6.5% to 7.7%
Primary data source	Public records + MLS + user input	MLS data (primary)
Update frequency	Several times/week	Daily (on-market); weekly (off-market)
Geographic coverage	100M+ homes nationwide	40M+ homes in Redfin markets
Best accuracy scenario	Off-market/unlisted homes	On-market (actively listed) homes
Owner data corrections	Yes, owners can update home facts	Limited

Error rates are median figures published by each company and updated periodically; check each platform’s accuracy page for the most current figures.

Redfin vs. Zillow accuracy for on-market homes

For homes actively listed for sale, Redfin’s median error rate of approximately 2.1% is marginally lower than Zillow’s 2.4%. This on-market advantage is the most widely cited finding in redfin estimate accuracy comparisons, and it holds across multiple independent analyses.

Redfin’s on-market median error rate

Redfin publishes its own redfin estimate accuracy data, reporting that half of homes that sold came within 2.09% to 2.1% of the Redfin Estimate at the time of sale. An independent study conducted by SSRS, commissioned by Redfin, found the Redfin Estimate was the most accurate publicly available home value estimate for on-market homes among major providers. The reason is structural: Redfin’s MLS-primary methodology gives it access to the most current listing and sale data, updated daily.

Zestimate accuracy for on-market homes

Zillow’s published zestimate accuracy figure for on-market homes is approximately 1.94% by its own data, though independent analyses place it closer to 2.4% when measured against final sale prices across a broader sample. The range of 1.94% to 2.4% reflects differences in methodology, time period, and the mix of markets included. For practical planning, using the 2.4% figure gives you the more conservative estimate.

When the gap actually matters

On a $400,000 home, the difference between a 2.1% and a 2.4% median error is approximately $1,200. That is a narrow gap for a benchmark tool. The more meaningful question is whether either number is close enough for your purpose. Appraisers, governed by Uniform Standards of Professional Appraisal Practice (USPAP), deliver opinions of value with far tighter precision than any AVM, and their reports carry legal standing that automated estimates do not. For pricing a home to sell, even a “good” AVM result needs to be cross-checked against a comparative market analysis (CMA) from a local agent.

Redfin vs. Zillow accuracy for off-market homes

For homes not currently listed for sale, Zillow’s Zestimate is slightly more accurate than Redfin’s estimate, the opposite of the on-market pattern. This reversal in the zillow zestimate vs redfin estimate comparison is the most underplayed finding in most articles covering this topic.

Why off-market estimates are harder to get right

When a home is not listed, neither platform has access to a current listing price or recent MLS activity for that specific property. Both tools fall back on comparable sales, public records, and tax assessments. Listing status is the single biggest factor affecting home value estimator accuracy for either platform. Data from off-market homes is older, harder to verify, and more likely to miss recent renovations or condition changes. This is why off-market median error rates for both platforms jump to the 6% to 7%+ range, compared to the low 2% range for listed homes.

Zillow’s off-market accuracy advantage

For off-market properties, Redfin’s median error rate ranges from approximately 6.45% to 7.72%, while Zillow’s off-market median error runs approximately 7.06% to 7.52%. The ranges overlap, so the difference is not dramatic, but Zillow’s larger dataset of 100M+ homes and its more diverse inputs give it a marginal edge when no active listing data is available.

On a $500,000 home at a 7% median error, the estimate can be off by $35,000 in either direction. That range is large enough to affect any financial decision based on your home’s value. Redfin’s off-market accuracy suffers specifically because its MLS-primary methodology is built around active listing data: without a current listing, it relies on the same public records Zillow uses, but from a smaller database and with fewer supplemental data points.

What causes inaccurate home value estimates?

Both platforms produce higher error rates under certain conditions. Understanding these conditions helps you interpret any AVM estimate you receive.

Limited comparable sales data

AVMs need recent nearby sales to calculate an accurate estimate. When there are fewer than 5 to 10 comparable sales in the trailing 12 months, both Zillow and Redfin produce wider error bands. Rural areas, unique properties (historic homes, custom builds, unusual lot sizes), and neighborhoods with low turnover all fall into this category. No algorithm compensates fully for a thin comparable sales dataset.

Renovations and upgrades not on record

Permitted improvements such as a kitchen remodel, HVAC replacement, or a new bathroom can materially raise a home’s value before the next tax assessment cycle captures them. Until public records or an owner’s manual profile update reflects the improvement, neither platform accounts for it. Both Zillow and Redfin allow owners to update their home profile, which feeds directly into the AVM’s inputs. For a breakdown of which upgrades move the number most, see improvements that add value.

Non-disclosure states and data gaps

Approximately 12 non-disclosure states do not make sale prices part of the public record. Commonly cited examples include Texas, Louisiana, Idaho, Montana, Utah, and Wyoming. In these states, both platforms lose access to actual transaction data and must rely on listing prices, tax assessments, and user-submitted inputs instead. If your property is in a non-disclosure state, treat any AVM figure as a wider estimate than the national median error rates suggest.

Which home estimate is most accurate overall?

No free online tool is the most accurate home valuation method available. A professional appraisal conducted in person by a licensed appraiser is the gold standard for home value estimator accuracy. That said, the redfin vs zillow home value verdict by scenario is clear: Redfin wins for on-market homes (2.1% median error) and Zillow holds a slight edge for off-market properties (7.1% to 7.5% median error).

For any decision that involves meaningful money, supplement your AVM with one of the following options.

A comparative market analysis (CMA) prepared by a local real estate agent uses current MLS data plus agent judgment about condition, presentation, and micro-market demand. According to NAR’s CMA guide, a CMA is standard practice in the listing process and is typically provided free by agents competing for your business. It is more accurate than either AVM for pricing decisions because it incorporates professional judgment alongside live MLS data.

A professional home appraisal is required by mortgage lenders for underwriting and involves a licensed appraiser physically inspecting the property. According to the CFPB appraisal guide, the appraiser adjusts for condition, improvements, and local market nuances that algorithms cannot assess. Appraisals typically cost $300 to $500 for a standard single-family home (costs vary by market and property complexity) and take 1 to 2 weeks to complete.

One important qualifier: even Redfin’s best-case 2.1% median error means half of on-market estimates fall outside that margin. The median error figure describes the middle of the distribution, not a guaranteed range for any individual home.

Estimate vs. appraisal vs. CMA: key differences

The three main property valuation methods serve different purposes and carry different levels of accuracy, cost, and professional involvement.

Professional home appraisal

A licensed appraiser conducts an in-person inspection, reviews comparable sales, and adjusts for condition, lot characteristics, and improvements. The process follows USPAP and produces a formal report that mortgage lenders and courts accept. The Appraisal Institute standards govern appraiser training, certification, and accountability nationwide. Cost: typically $300 to $500 for a standard single-family home, with variation by market and property complexity. Timeline: 1 to 2 weeks.

Comparative market analysis (CMA)

A CMA is prepared by a licensed real estate agent using current MLS data, recent comparable sales, and on-site judgment about condition and location. It is not a formal home appraisal, but it is more accurate than any AVM for pre-listing pricing decisions. Cost: free from a listing agent. Timeline: 1 to 3 days. A CMA is the best free option for sellers who need accurate pricing guidance before listing.

When to use each valuation method

The table below compares cost, speed, accuracy, and best use case across all three options.

Method	Cost	Speed	Typical accuracy	Requires professional	Best used for
AVM (Zestimate or Redfin Estimate)	Free	Instant	2.1% to 7.7% median error	No	Quick benchmark
CMA	Free from agent	1 to 3 days	Lower error than AVM	Real estate agent	Pre-listing pricing
Home appraisal	$300 to $500	1 to 2 weeks	Highest accuracy	Licensed appraiser	Mortgage underwriting, legal proceedings

If you are near a sell-and-buy decision, knowing your home’s value is just the first step. See what you can afford after your sale to model the full move before you list.

How to improve your home value estimate

Claiming your home on both platforms and correcting the property data takes 5 to 10 minutes per platform. Both Zillow and Redfin allow owner updates, and those updates feed directly into their AVM inputs. Steps 2 and 5 require email verification on each platform before you can edit property facts.

After updating both profiles, allow 24 to 48 hours for the changes to appear in each platform’s estimate. Overall home value estimator accuracy on both platforms improves when owners keep property profiles current. Both zestimate accuracy on Zillow and redfin estimate accuracy on Redfin depend on fresh data inputs. To benchmark a third AVM alongside both tools, see Trulia vs Zillow estimates.

Online estimates give you a useful benchmark, but a real offer tells you exactly what buyers will pay today. iBuyer.com connects you with multiple vetted cash buyers who submit competing offers on your home, typically within 24 to 48 hours after you submit your address and basic details. You can compare those offers side by side without listing on the MLS, paying agent commissions, or completing repairs. If the numbers work, you can close in as few as 7 days.

Frequently Asked Questions