Getting started · 5 min read

How to Measure a House When You Don't Have a Floor Plan

PlanSnapper works from any image of a floor plan — but what if you don't have one? Before you assume you're stuck, there are several places a floor plan might already exist. And if there truly is nothing available, you have options.

Step 1: Check these sources first

Many homeowners and agents are surprised to find a usable floor plan in places they hadn't thought to look:

• Previous appraisal report. If the home has ever been appraised — for a purchase, refinance, or estate — the appraiser almost certainly drew a floor plan sketch. Ask the homeowner or pull from the loan file if you have access.
• MLS listing photos. Many listings include a floor plan image. Check the photo carousel on Zillow, Redfin, or the brokerage site. Even older listings sometimes have them archived.
• Builder or architect records. For newer homes, the builder may have the original floor plan on file. For custom homes, the architect typically has drawings.
• Permit records. Permit applications require a site plan or floor plan in most jurisdictions. Your county building department archives are public records — check online or in person.
• Home inspection report. Some inspection reports include rough floor sketches. Not to scale, but a starting point.
• HOA or condo association. For condos and townhomes, the HOA often has unit floor plans on file from the original developer.

Step 2: Get a quick scan if you need one

If no existing floor plan is available, the fastest way to get a to-scale floor plan is a scan service:

• CubiCasa — Shoot photos room by room with your phone using their app. They generate a floor plan within a few hours for around $25 to $30. The output is professional and to scale.
• Matterport — 3D scan with a specialized camera (or some phone models). More expensive but produces a highly accurate floor plan along with a 3D walkthrough.
• iGUIDE — Similar to Matterport. Often used by real estate photographers. Produces accurate floor plans.

These services export PDF or image floor plans that work directly in PlanSnapper.

Step 3: Sketch it yourself

If you need a measurement now and cannot wait for a scan, you can create a usable floor plan with a tape measure and a piece of paper:

1. Walk the exterior of the home and measure each wall segment. Note the length of every straight run.
2. Sketch the shape on paper — it does not need to be beautiful, just proportionally correct. Use graph paper if available.
3. Write the actual measurements on each wall segment.
4. Take a clear, flat photo of the sketch from directly above (no angle).
5. Upload the photo to PlanSnapper, trace the perimeter, and use one of your measured wall lengths to set the scale.

A hand-drawn sketch works well for simple rectangular or L-shaped homes. For complex floor plans with many offsets, a scan service will save time and reduce errors.

What about the FAQ answer "what if I don't have any measurements"?

PlanSnapper requires at least one known real-world dimension to set the scale. If you do not know any wall lengths, you cannot calculate square footage from a floor plan image alone — the software does not know how big the drawing is in real life.

The minimum you need: one wall whose length you know (or can measure). Even one correct measurement — say, a 20-foot garage door opening — is enough to set the scale and calculate everything else accurately.

See: What if I don't have any measurements?

Related questions

• What if I don't have any measurements?
• How to set scale in PlanSnapper
• Using CubiCasa, Matterport, and iGUIDE floor plans
• Can I use phone photos for floor plans?
• How accurate is PlanSnapper?
• How to measure square footage of a house
• How to get a floor plan of an existing home
• Laser Measure vs Tape Measure for Floor Plans: Which Is More Accurate?
• CubiCasa vs Matterport: Which Floor Plan Tool Should You Choose?