An insulation bid is a stack of areas: walls to batt or blow, attic flats to cover, rim joists and knee walls to seal, maybe a basement. Each one is priced per square foot at a depth, and all of them come from measurements somebody has to take.
What the scan measures directly
- Wall area per room, openings subtracted — exterior walls are your cavity area
- Ceiling area per room, which is the attic flat below it
- Wall heights, which decide batt lengths and whether knee walls are in play
- Whole-house totals for a blanket retrofit number
Interior versus exterior walls
The scan gives you every wall. Insulation only cares about some of them, and the model is what lets you tell them apart quickly — walk the plan, identify which walls are on the building envelope, and sum those. For a sound-insulation scope, interior partitions become the quantity instead, and the same scan already has them.
What to note out loud
Insulation scope lives in details a geometry capture cannot see. Pin them as voice notes while you are in the space:
- Existing insulation type and rough depth
- Whether the attic has a floor over the flat
- Vent baffles, can lights, and knob-and-tube
- Access — hatch size and where it is
Attics, practically
You can scan an attic, and the footprint and height come back usable. What you will not get is a clean room model out of a space framed with trusses. For most bids the better path is to take the attic flat from the ceiling areas below it, and use the attic visit for condition, depth, and access notes.
Why it wins work
Retrofit insulation is sold on a payback story, and the story needs real square footage. "Your envelope is 2,840 square feet of wall and 1,610 of flat" is a different conversation from an estimate.
Air leaks are invisible. The area you are sealing does not have to be.