Compare · 8 min read
Zillow vs Redfin: Which Has More Accurate Square Footage?
Buyers and sellers often notice that Zillow and Redfin show different square footage for the same home. Understanding where these numbers come from, and why they diverge: is key to knowing when to trust them and when to verify.
The short version
- Zillow: Square footage sourced from public records and MLS data. Can lag behind updates. Zestimate is square-footage-sensitive.
- Redfin: Also sources from public records and MLS. Generally more current MLS data in tech-forward markets. Same underlying data quality issues.
Zillow vs Redfin: at a glance
| Zillow | Redfin | |
|---|---|---|
| Data source | Public records + MLS | Public records + MLS |
| Physical measurement | No | No |
| Data freshness | Can lag by years | More current in tech markets |
| ANSI-compliant figures | No | No |
| Best use | Quick estimate | Quick estimate |
Already have a floor plan?
Upload it to PlanSnapper and get your square footage in minutes. No software to install.
Measure your floor plan →Where the numbers come from
Both Zillow and Redfin pull square footage from two primary sources: county tax assessor records and MLS (Multiple Listing Service) data. Neither company physically measures homes. The accuracy of their displayed square footage is entirely dependent on the accuracy of the underlying data sources.
County assessor records can be outdated, especially after additions or renovations. MLS data is more recent but depends on what the listing agent entered: which may or may not match a professional appraisal.
Why they sometimes differ
Zillow and Redfin may display different numbers for the same home because they weight their sources differently or pull from different regional MLS feeds. Zillow tends to default to public record data when it differs from MLS; Redfin sometimes shows MLS data more prominently in markets where they have direct feed agreements.
Neither is definitively more accurate. Both are as good as the data they receive.
Common errors
The most common sources of square footage error on both platforms: finished basement area included in living area (which ANSI Z765 does not allow); garage square footage accidentally included; unverified seller-entered figures from expired listings that persist in the database; and assessor records that were never updated after unpermitted additions.
How to verify
If square footage matters for a transaction, and it usually does, since it affects price per square foot, appraisal value, and tax assessment: verify with a professional appraisal, a CubiCasa or iGUIDE scan, or by uploading a to-scale floor plan to a measurement tool. Don't rely solely on Zillow or Redfin for any transaction where accuracy is critical.
Already have the floor plan?
If you have a floor plan of the property: from an appraisal, a listing package, or a scan service. You can verify or recalculate the square footage yourself using PlanSnapper. Upload the floor plan, set the scale, trace the perimeter, and get a measurement in minutes.
Related reading
- Deed square footage vs appraisal: which is accurate?
- How to measure the square footage of a house
- What is gross living area (GLA)?
- Floor plan measurement tool for GLA calculation
- Zillow vs Trulia Square Footage: comparison
- PlanSnapper vs Redfin estimate: comparison
- Is Zillow square footage accurate?: FAQ
- Appraisal square footage vs. listing square footage: FAQ
Frequently Asked Questions
What is the difference between Zillow and Redfin Square Footage?
Zillow and Redfin Square Footage are different tools with different strengths. The best choice depends on your workflow, budget, and whether you need features like 3D scanning, floor plan generation, GLA calculation, or design capabilities. This page breaks down a direct comparison.
Which is better for real estate appraisers: Zillow or Redfin Square Footage?
Zillow and Redfin Square Footage serve different workflows. Zillow is better suited for one use case while Redfin Square Footage fits another: the right choice depends on whether you need field capture or office-based GLA calculation from existing floor plans.
Can Zillow and Redfin Square Footage be used together?
Zillow and Redfin Square Footage can complement each other in some workflows: for example, using one for field capture and the other for GLA calculation and reporting. Check the comparison table above for specific integration details.
How much does Zillow cost compared to Redfin Square Footage?
Zillow and Redfin Square Footage have different pricing models: one may charge per user, per project, or via annual subscription, while the other may offer a free tier or pay-per-use option. Check the comparison table above for current pricing details and which offers better value for your volume of work.
Which is easier to use: Zillow or Redfin Square Footage?
Ease of use depends on your starting point. Zillow tends to fit one type of user or workflow, while Redfin Square Footage is designed for another. If you are working from an existing floor plan PDF and need to calculate square footage quickly, a browser-based tool like PlanSnapper may reduce the learning curve entirely: no software installation required.
Do I need Zillow or Redfin Square Footage if I already have a floor plan PDF?
If you already have a floor plan as a PDF or image, you may not need either tool. PlanSnapper lets you upload the PDF directly and trace walls in your browser to calculate GLA: no software installation required. Both Zillow and Redfin Square Footage are most useful for creating sketches from scratch or capturing measurements in the field.
Which works better for calculating GLA: Zillow or Redfin Square Footage?
Both Zillow and Redfin Square Footage can support GLA calculation, but the workflow differs. One may require field measurement and sketch entry while the other may allow importing existing floor plans. If your starting point is an existing PDF or image floor plan, PlanSnapper provides a faster path: upload, trace, and get the GLA figure without entering either tool's workflow.
How do Zillow and Redfin Square Footage handle existing floor plan PDFs?
Neither Zillow nor Redfin Square Footage is primarily designed to import and calculate square footage from an existing PDF floor plan. Both tools are built around creating or capturing floor plans from scratch. If you already have a PDF floor plan, PlanSnapper lets you upload it directly, trace the walls, and get an accurate GLA figure without redrawing anything.
Which is better for occasional users: Zillow or Redfin Square Footage?
Zillow and Redfin Square Footage are both specialized tools with learning curves that reward regular use. Occasional users often find dedicated subscription tools hard to justify. For someone who needs to calculate square footage a few times a month, PlanSnapper is designed for exactly that: no training required, no annual contract, upload and measure in minutes.