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MeasureFloorPlan vs Google Maps for Floor Plan Measurement

Google Maps has a built-in measurement tool that lets you trace areas on satellite imagery. It sounds like a shortcut for calculating square footage, but it measures from above, not from a floor plan. That distinction matters a lot for real estate and appraisal work.

What Google Maps measures

Google Maps' “Measure distance” tool traces distances and enclosed areas on aerial or satellite imagery. You can right-click any location, select Measure distance, and click to build a polygon: Google will calculate the enclosed area.

This works well for rough property lot sizes, but for measuring a building's floor area it has serious limitations:

• It measures the roof footprint, not the floor plan. Overhanging eaves, roof edges, and irregular rooflines distort the measurement of the actual living area below.
• Imagery resolution varies by location. In dense urban areas or rural markets, satellite imagery may be months or years old and lack the precision needed to trace exterior walls accurately.
• It does not handle multiple stories. A two-story home with 1,200 sq ft per floor reads as 1,200 sq ft from above: not 2,400. You cannot derive GLA from overhead imagery.
• No ANSI Z765 methodology. Google Maps has no concept of above-grade vs below-grade, ceiling height rules, or GLA inclusions/exclusions. The area you trace is just geometry: not appraisal-compliant square footage.

What MeasureFloorPlan measures

MeasureFloorPlan measures GLA from floor plan files: PDFs, photos, or images exported from CubiCasa, Matterport, iGUIDE, or architect drawings. You trace the exterior walls on each floor level, set a scale reference using one known dimension, and get ANSI-compliant square footage in under two minutes.

Because you're working from a floor plan rather than aerial imagery, you can:

• Measure each floor independently (main level, upper floors, walkout basement)
• Exclude non-GLA areas like garages and unfinished basements
• Apply ANSI Z765 ceiling-height rules for attics and finished spaces
• Get a measurement that matches what a licensed appraiser would produce

Side-by-side comparison

When Google Maps is fine

Google Maps measurement is perfectly adequate for estimating lot size, measuring distances between two points on a property, or getting a rough order-of-magnitude sense of a single-story building's footprint. For casual curiosity or preliminary research, it works.

Where it falls short: any use case requiring accuracy, multi-story precision, ANSI compliance, or a number you'd stake professional judgment on.

When to use MeasureFloorPlan instead

• Appraiser calculating ANSI-compliant GLA from a CubiCasa or Matterport floor plan
• Real estate agent verifying square footage before a listing goes live
• Buyer confirming the listed square footage before making an offer
• Homeowner getting an accurate number for insurance or refinance
• Investor underwriting a property based on floor plan from an existing appraisal

Bottom line

Google Maps is a mapping tool, not a floor plan measurement tool. It sees roofs from above and cannot produce GLA. MeasureFloorPlan works from actual floor plans to produce appraisal-standard square footage. They're solving different problems.

If you have a floor plan and need GLA, MeasureFloorPlan is the right tool. If you need to estimate a lot boundary from satellite view, Google Maps is fine.

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