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Read the drawing without guessing
Site plan scale: what 1 inch = 20 feet means
Scale connects a distance on paper to a distance on the property. Read the written scale, check the scale bar, and print at actual size before measuring the sheet.
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Stated scale + scale bar
The short answer
One inch on paper can stand for many feet outside.
A note such as 1" = 20' means one inch on the correctly printed sheet represents 20 feet on the property. A line measuring 3 inches on that sheet represents 60 feet outside.
The same scale can appear as 1:240. Both sides then use the same unit. One inch on paper represents 240 inches, or 20 feet, on the property.
Scale does not prove a boundary. It only states the drawing relationship. Use written dimensions and verified records before scaled measurements.
Common scale examples
A larger denominator fits more ground on the sheet.
These examples explain the math. They are not a substitute for your permit office's sheet and scale requirements.
| Written scale | Ratio | What changes | Quick ruler check |
|---|---|---|---|
| 1 inch = 10 feet | 1:120 | Shows more detail, but covers less ground on the same sheet. | 2 inches on paper represents 20 feet on the property. |
| 1 inch = 20 feet | 1:240 | Balances lot coverage and readable detail for many residential drawings. | 2 inches on paper represents 40 feet on the property. |
| 1 inch = 30 feet | 1:360 | Fits more of a large lot, while making each feature smaller. | 2 inches on paper represents 60 feet on the property. |
| 1 inch = 40 feet | 1:480 | Covers still more ground, so labels and short dimensions need care. | 2 inches on paper represents 80 feet on the property. |
Three checks before filing
Check the output, not only the scale note.
- 01
Read the permit instructions
Confirm the accepted sheet size, required drawing details, and any stated scale rule. Local instructions control.
- 02
Print at actual size
Choose actual size or 100%. Fit-to-page settings can shrink the drawing and make the written scale inaccurate.
- 03
Measure the scale bar
Compare the printed bar with a ruler. Then verify one labeled distance. Stop if either check disagrees.
Choose a readable scale
Fit the lot without shrinking the information.
Start with the required paper size and everything the reviewer must see. Choose a scale that keeps the full lot, project, dimensions, north arrow, notes, and title block inside the printable area.
Keep labels legible
A scale fails when dimensions fit but the text becomes too small to read.
Use written dimensions
Label the distances that decide placement. Do not make the reviewer measure every gap.
Keep a graphic scale
A scale bar gives the printed or resized page a visible check.
Site plan scale questions
Short answers before you measure
What scale should a residential site plan use?
Use a scale that fits the full required area on the requested sheet while keeping labels and dimensions readable. The permit office's current instructions control. Common engineering-style examples include 1 inch equals 10, 20, 30, or 40 feet.
What does 1 inch = 20 feet mean on a site plan?
It means each measured inch on the correctly printed drawing represents 20 feet on the property. The equivalent ratio is 1:240 because 20 feet contains 240 inches.
How do I know whether a PDF printed to scale?
Print at actual size or 100%, not fit to page. Then measure the graphic scale bar with a ruler. You can also compare one written dimension with its measured paper length. If the checks disagree, do not measure other distances from that copy.
Can I measure a site plan on my phone screen?
Do not rely on a screen ruler. Zoom level, browser scaling, and device size change the displayed length. Use written dimensions first. Use the scale bar on a correctly printed copy when you must measure the drawing.
Is a scaled site plan a land survey?
No. Scale describes the drawing's size relationship. It does not certify a boundary or turn public-record linework into field-located surveying work.
Does EasySitePlan create scaled drawings?
EasySitePlan creates editable preliminary permit plans with a stated scale and graphic scale bar for eligible fence, shed, and pool projects in six Texas cities. You inspect the free watermarked preview before buying the clean PDF for $24.
Continue with one useful guide