Tips & Setup · 4 min read

What If I Don't Have Any Measurements?

PlanSnapper needs one known wall length to set the scale. If you don't have a tape measure and the floor plan doesn't include dimensions, here are several reliable ways to get a wall length — ordered from most to least accurate.

1. Google Maps — Measure Distance (most accurate)

Google Maps has a built-in measuring tool that works directly off aerial imagery. It is surprisingly accurate for exterior wall lengths on residential properties.

How to use it:

• Go to maps.google.com and search for the property address
• Switch to Satellite view
• Right-click on one corner of the house
• Select Measure distance
• Click the opposite corner of the wall you want
• Google shows the distance in feet — use that as your known wall length in PlanSnapper

Pick the longest straight exterior wall for the most accurate scale. The longer the reference wall, the smaller any measurement error becomes relative to the total area.

If the property is obscured by tree cover or the aerial image is low resolution, try Google Earth instead — it sometimes has better imagery for the same address.

2. Estimate from a car in the aerial photo

If you can see a car parked next to or near the house in the aerial image, you have a built-in scale reference. A standard sedan is roughly 15 feet long and 6 feet wide. An average SUV or pickup runs about 17 feet long and 7 feet wide.

Compare the car's apparent length to the wall you need to measure, estimate the ratio visually, and use that to get a ballpark wall length. Not as precise as the Google Maps measuring tool, but useful when no better option exists.

3. Standard door widths

Doors are one of the most reliable visual references because they are highly standardized in residential construction. If you can see a door on the floor plan or in a photo, you can use it to estimate wall length.

• Standard interior door: 2'8" (32 inches) wide — the most common size in US homes
• Standard exterior/entry door: 3'0" (36 inches) wide
• Sliding glass door: 6'0" or 8'0" wide
• Single garage door: 8'0" to 9'0" wide
• Double garage door: 16'0" to 18'0" wide

If the floor plan shows a door on a wall you can measure against, count how many door-widths long the wall is and multiply. For example, a wall that appears to be roughly four standard interior doors wide is approximately 10'8".

4. Standard window sizes

Windows are less standardized than doors but still useful as a rough reference:

• Standard double-hung window: 24 to 36 inches wide (2'0" to 3'0")
• Common bedroom window: 2'8" to 3'0" wide
• Picture window: 4'0" to 6'0" wide

5. Kitchen appliances

If the floor plan shows a kitchen with appliances, those are highly standardized:

• Standard range/stove: 30 inches wide
• Dishwasher: 24 inches wide
• Refrigerator: 30 to 36 inches wide
• Base cabinets: 24 inches deep

A run of kitchen cabinets with a stove and dishwasher visible on the floor plan can give you a rough wall length to work with.

6. Brick counting

For brick homes, you can count the bricks visible along an exterior wall and calculate the length. A standard US brick is 3-5/8 inches wide with a 3/8 inch mortar joint, giving 4 inches per brick measured horizontally. Count the bricks along the wall and multiply by 4 inches.

For example, 30 bricks across a wall = 120 inches = 10 feet. This works best from a straight-on photo or Street View.

7. County assessor or permit records

Most county assessor websites publish building dimensions, lot size, and sometimes room dimensions as part of the public property record. Search for the property address on your county assessor site and check the parcel details.

Building permits are also public record. If the home had an addition or renovation, the permit drawings sometimes include exterior dimensions. Check with the local building department.

Accuracy tip: pick the longest wall you can estimate

Whatever method you use, set the scale using the longest wall you can estimate. A 1-foot error on a 10-foot wall is a 10% scale error. The same 1-foot error on a 40-foot wall is only 2.5%. The longer your reference, the less any estimation error affects the final square footage.