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How to Measure a Floor Plan for a Renovation

Renovation budgets live and die on accurate square footage. Contractors price by the square foot. Materials are ordered by the square foot. A 10% measurement error can mean thousands of dollars of rework. Here is how to get it right before the project starts.

What you need before you start

For a renovation measurement, you need the existing floor plan of the space being renovated. If you do not have one, a CubiCasa scan of the space runs $79-$99 and produces an accurate to-scale PDF floor plan within 24 hours. For a smaller scope (single room or addition), you can photograph a hand-drawn sketch taken with a tape measure.

You will also need the planned layout if you are reconfiguring the space. Architect drawings or sketches from a designer work for this. If you are only renovating in place (no layout changes), the existing floor plan is sufficient.

Measuring existing space

Upload the floor plan to MeasureFloorPlan.com and trace the areas being renovated. For a whole-home renovation, trace the full living area. For a kitchen or bathroom project, trace just that room. Set scale from any labeled room dimension.

The tool shows area per polygon. Add polygons for each distinct space: kitchen, living room, master bath — whatever breakdown your contractor needs for pricing. Label each one so the areas correspond to the project scope.

Measuring for specific renovation use cases

Flooring: Trace the room footprint including under cabinets and into closets. Add 10% waste factor for straight-lay hardwood or LVP, 15% for diagonal lay or tile. See floor plan measurement for flooring.

Paint: For wall area, multiply the perimeter of the room by the ceiling height, then subtract door and window areas (typically 20 sq ft per door, 15 sq ft per window). The tool gives you perimeter; enter ceiling height to get wall area.

HVAC: HVAC contractors size systems by square footage of conditioned space. Trace the total above-grade finished area being heated and cooled. Do not include garage or unconditioned basement.

Addition: Trace both the existing footprint and the addition footprint as separate polygons. The addition area helps size structural work; the combined area helps price finishes.

Getting contractor-ready numbers

Most contractors want square footage broken down by area: total living area, kitchen area, bathrooms, bedrooms. Use the multi-polygon feature to trace each space separately. The sidebar shows each polygon area plus a running total.

For permit applications, you will need both existing square footage and new square footage (if adding an addition). Keep them as separate polygons so you can report each independently.

Export your measurements as a PDF directly from MeasureFloorPlan.com.