Description
Compare a supplied upper envelope with explicit two-sided stepbacks, without zoning rules.
A planning scenario combines parcel dimensions, frontage, service space, and explicitly supplied rules. Gross, excluded, and counted areas can use different bases. A geometric result describes the chosen model while site conditions and the governing requirements need separate verification.
Compare a supplied upper envelope with explicit two-sided stepbacks, without zoning rules.
When to use this tool
Use Building Stepback Width Gap when you need the stated geometric or planning-indicator term under supplied site dimensions and rule choices.
How to use the tool and how it works
- Enter lowerWidth, upperWidth, leftStepback, rightStepback. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read availableUpperWidth, widthGap. Use the output convention below.
Calculate availableUpperWidth=lowerWidth-leftStepback-rightStepback and widthGap=availableUpperWidth-upperWidth. Require nonnegative dimensions and combined stepbacks within lowerWidth.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| lowerWidth | Lower Width | Required. Finite number; minimum 0. |
| upperWidth | Upper Width | Required. Finite number; minimum 0. |
| leftStepback | Left Stepback | Required. Finite number; minimum 0. |
| rightStepback | Right Stepback | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| availableUpperWidth | Available Upper Width | Required. Finite number. |
| widthGap | Width Gap | Required. Finite number. |
{
"input": {
"lowerWidth": 20,
"upperWidth": 12,
"leftStepback": 3,
"rightStepback": 4
},
"output": {
"availableUpperWidth": 13,
"widthGap": 1
}
}Limitations and assumptions
- Negative widthGap indicates a supplied upper width exceeding the envelope. No applicable setback rule, irregular footprint, structural capacity, or planning approval is determined.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Use measured site geometry and the applicable authoritative definitions when a planning decision needs more than this supplied term. A complete layout, access, or structural review can require additional models.
References
Similar or alternative tools
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