How to Get Square Footage from a CubiCasa Floor Plan

CubiCasa produces some of the most accurate floor plans in real estate, but they deliberately leave out total square footage. Here's why, and how to get the number you need.

Why CubiCasa floor plans don't show square footage

CubiCasa uses LiDAR scanning and photogrammetry to produce highly accurate,to-scale floor plans. They're widely used by real estate agents, especially in markets like San Francisco where professional floor plans are now standard practice.

Despite their accuracy, CubiCasa floor plans typically omit total square footage. The reason is almost certainly liability: if CubiCasa publishes a square footage number that turns out to be off by even a small margin, they could face disputes in real estate transactions. By omitting the total and leaving individual room dimensions visible, they shift the calculation responsibility to the end user.

The result: you have a precise, to-scale plan with all the room dimensions you need, but no total, and calculating it manually from room dimensions is tedious and error-prone on anything but a simple rectangular floor plan.

Method	Accuracy	Time
Trace floor plan in PlanSnapper	Within ~1% of true GLA (LiDAR-accurate plan)	2–5 min
Sum individual room dimensions manually	Lower — misses hallways, closets, wall thickness	15–30 min + error-prone
Field exterior measurement (ANSI Z765)	Highest — appraiser standard	30–90 min; requires property access
Google Maps / satellite area tool	Low — 10–20% off; roofline distortion	5 min but unreliable

The fast way: PlanSnapper

PlanSnapper was built specifically for this workflow. It reads the floor plan as an image, auto-detects the exterior perimeter, and lets you calibrate the scale using any single measurement visible on the plan.

Export or screenshot your CubiCasa floor plan. Any image format works, PNG, JPG, or a screenshot of the PDF.
Upload to PlanSnapper. Drag and drop the image. Auto-detect will trace the exterior perimeter in seconds.
Set the scale. Click the two ends of any wall or room dimension shown on the CubiCasa plan. Enter the real length (e.g. 12'6").
Calculate. Get total square footage, all wall lengths, and perimeter instantly.

Because CubiCasa plans are generated from LiDAR data and are accurately to-scale, PlanSnapper results on CubiCasa floor plans are consistently within 1% of the true square footage when calibrated from a known wall measurement.

Try PlanSnapper on your CubiCasa floor plan, $9 day pass or $29/month. Get started →

Which CubiCasa plan format works best?

PlanSnapper works on any image-based floor plan. For CubiCasa specifically:

2D floor plan (PNG/PDF): Best option. Clean lines, clear room labels, auto-detect works reliably.
Furnished floor plan: Works, though furniture can sometimes confuse auto-detection. Use the gap slider or manual trace if needed.
3D renders: Not supported, PlanSnapper needs a top-down 2D view.

What about multi-level homes?

CubiCasa produces separate floor plans for each level. Run PlanSnapper once per level, each measurement takes under a minute once you have the scale set. Sum the results for total livable square footage. Use the "Add Separate Polygon" feature within a single level to handle attached garages or ADUs separately.

Manual alternative: calculating from room dimensions

If you'd rather calculate manually from the CubiCasa room labels:

List each room's dimensions from the plan labels.
Multiply width × length for each room.
For irregular roomss (L-shapes, angled walls), break them into rectangles and sum.
Add all room areas together.
Subtract any areas that shouldn't count as living space (closet walls, stairwells depending on jurisdiction).

This works but has real failure modes: it's easy to miss a wall offset, double-count a shared wall, or misread a label. On a complex floor plan, manual calculation can be off by 50–200 sq ft without realizing it.

For appraisers: CubiCasa vs. your GLA measurement

If you're an appraiser, you likely have your own field measurement as the primary source per the ANSI Z765 standard. PlanSnapper on a CubiCasa plan is useful as a quick cross-check, if your field measurement and PlanSnapper diverge significantly, it's worth investigating before the report goes out. Many SF Bay Area appraisers use this workflow as a secondary verification step on every appraisal.

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Frequently Asked Questions

How accurate is CubiCasa square footage measurement?

CubiCasa claims accuracy within 1% of professional measurements in controlled tests. In practice, accuracy depends on scan quality, phone hardware, and room complexity. Results are suitable for marketing and listing purposes but should be verified for formal appraisal use.

Does CubiCasa measurement meet ANSI Z765 standards?

CubiCasa produces floor plans and square footage estimates, but their measurement methodology is not certified as ANSI Z765-compliant. For mortgage appraisals requiring ANSI Z765 GLA, an appraiser must perform an independent exterior measurement.

What file formats does CubiCasa export for floor plans?

CubiCasa exports floor plans as PDF, PNG, JPG, DXF (CAD), and JSON data formats. The PDF and image exports are useful for listing marketing. The DXF format allows further editing in CAD software. JSON data can be integrated with property management platforms.

Why doesn't CubiCasa show total square footage on its floor plans?

CubiCasa omits total square footage primarily for liability reasons. If the published figure turned out to be off by even a small margin, CubiCasa could face disputes in real estate transactions. By showing individual room dimensions but leaving the total calculation to the user, they shift that responsibility to the end user.

Can I use a CubiCasa floor plan to verify square footage before buying a home?

Yes. CubiCasa floor plans are to-scale and accurate enough for a meaningful pre-purchase check. Upload the CubiCasa plan to PlanSnapper, calibrate the scale from any labeled wall dimension, and trace the exterior perimeter to get total square footage. The result is typically within 1% of true GLA on well-scanned plans.

How do I calculate square footage from a CubiCasa floor plan without measuring room by room?

Upload the CubiCasa floor plan image to PlanSnapper, click two endpoints of any labeled wall to set the scale, and trace the exterior perimeter of the living area. PlanSnapper calculates GLA automatically from the traced polygon - no room-by-room math required. This takes 2 to 5 minutes per floor level.

Does CubiCasa work for two-story homes?

Yes. CubiCasa produces a separate 2D floor plan for each level of a multi-story home. Run PlanSnapper on each level separately and sum the results for total above-grade GLA. Use the "Add Separate Polygon" feature within a single level to handle attached garages or ADUs as distinct measurements.

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More guides on floor plan measurement tools:

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