Commercial Zoning Compliance Square Footage Calculator

ANA›Life Services Authority›National Calculator Authority›Commercial Zoning Compliance Square Footage Calculator

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Commercial Zoning Compliance Square Footage Calculator

Determine if your commercial building project complies with zoning regulations by calculating allowable building footprint, maximum gross floor area, required open space, and parking area based on lot dimensions, setbacks, floor area ratio (FAR), and lot coverage limits.

Lot Width (ft)

Lot Depth (ft)

Front Setback (ft)

Rear Setback (ft)

Left Side Setback (ft)

Right Side Setback (ft)

Floor Area Ratio (FAR)

Typical commercial FAR: 0.5 – 5.0

Maximum Lot Coverage (%)

Number of Floors

Required Open Space (%)

Percentage of gross lot area that must remain open/landscaped

Parking Ratio (spaces per 1,000 sq ft GFA)

Area per Parking Stall (sq ft)

Typical stall + drive aisle: 300–350 sq ft

Calculate Compliance

function comCalc() { var resultDiv = document.getElementById('com-result'); resultDiv.style.display = 'none'; resultDiv.innerHTML = '';

var lotWidth = parseFloat(document.getElementById('com-lot-width').value); var lotDepth = parseFloat(document.getElementById('com-lot-depth').value); var frontSetback = parseFloat(document.getElementById('com-front-setback').value); var rearSetback = parseFloat(document.getElementById('com-rear-setback').value); var leftSetback = parseFloat(document.getElementById('com-left-setback').value); var rightSetback = parseFloat(document.getElementById('com-right-setback').value); var far = parseFloat(document.getElementById('com-far').value); var maxCoverage = parseFloat(document.getElementById('com-lot-coverage').value); var floors = parseFloat(document.getElementById('com-floors').value); var openSpacePct = parseFloat(document.getElementById('com-open-space').value); var parkingRatio = parseFloat(document.getElementById('com-parking-ratio').value); var parkingStall = parseFloat(document.getElementById('com-parking-stall').value);

var errors = [];

if (isNaN(lotWidth) || lotWidth 100) errors.push("Maximum Lot Coverage must be between 1 and 100."); if (isNaN(floors) || floors = 100) errors.push("Required Open Space must be between 0 and 99."); if (isNaN(parkingRatio) || parkingRatio = lotDepth) errors.push("Front + Rear setbacks equal or exceed lot depth — no buildable depth remains."); if ((leftSetback + rightSetback) >= lotWidth) errors.push("Left + Right setbacks equal or exceed lot width — no buildable width remains.");

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// ── Core Calculations ──────────────────────────────────────────────────────

// 1. Gross Lot Area var grossLotArea = lotWidth * lotDepth;

// 2. Buildable Envelope (after setbacks) var buildableWidth = lotWidth - leftSetback - rightSetback; var buildableDepth = lotDepth - frontSetback - rearSetback; var buildableEnvelope = buildableWidth * buildableDepth;

// 3. Max Building Footprint by Lot Coverage // Max Footprint (coverage) = Gross Lot Area × (maxCoverage / 100) var maxFootprintByCoverage = grossLotArea * (maxCoverage / 100);

// 4. Max Building Footprint by FAR & Floors // Max GFA by FAR = Gross Lot Area × FAR // Max Footprint by FAR = Max GFA by FAR / Floors var maxGFAbyFAR = grossLotArea * far; var maxFootprintByFAR = maxGFAbyFAR / floors;

// 5. Controlling Max Footprint = min(buildableEnvelope, maxFootprintByCoverage, maxFootprintByFAR) var maxAllowableFootprint = Math.min(buildableEnvelope, maxFootprintByCoverage, maxFootprintByFAR);

// 6. Max Gross Floor Area (GFA) // GFA = maxAllowableFootprint × floors (but also capped by FAR) var maxGFAbyFootprint = maxAllowableFootprint * floors; var maxGFA = Math.min(maxGFAbyFootprint, maxGFAbyFAR);

// 7. Actual Lot Coverage % achieved var actualCoveragePct = (maxAllowableFootprint / grossLotArea) * 100;

// 8. Required Open Space Area // Open Space Area = Gross Lot Area × (openSpacePct / 100) var requiredOpenSpace = grossLotArea * (openSpacePct / 100);

// 9. Required Parking Spaces // Parking Spaces = (maxGFA / 1000) × parkingRatio → rounded up var requiredParkingSpaces = Math.ceil((maxGFA / 1000) * parkingRatio);

// 10. Parking Area Required // Parking Area = requiredParkingSpaces × parkingStall var parkingAreaRequired = requiredParkingSpaces * parkingStall;

// 11. Net Usable Site Area (lot minus open space minus parking) var netUsableSite = grossLotArea - requiredOpenSpace - parkingAreaRequired;

// 12. Compliance Checks var coverageCompliant = actualCoveragePct = maxAllowableFootprint;

// ── Formatting Helper ──────────────────────────────────────────────────────
function fmt(n, dec) {
dec = dec === undefined ? 2 : dec;
return n.toLocaleString('en-US', {minimumFractionDigits: dec, maximumFractionDigits: dec});
}
function badge(ok) {
return ok
? '✔ Compliant'
'✘ Non-Compliant'; }

var overallOK = coverageCompliant && farCompliant;

var html = '### Zoning Compliance Results ';

html += ''; html += '' + 'Parameter' + 'Value' + '';

var rows = [ ["Gross Lot Area", fmt(grossLotArea) + " sq ft"], ["Buildable Envelope (after setbacks)", fmt(buildableEnvelope) + " sq ft (" + fmt(buildableWidth) + " ft × " + fmt(buildableDepth) + " ft)"], ["Max Footprint — Lot Coverage Limit", fmt(maxFootprintByCoverage) + " sq ft"], ["Max Footprint — FAR / Floors Limit", fmt(maxFootprintByFAR) + " sq ft"], ["Max Allowable Building Footprint", "" + fmt(maxAllowableFootprint) + " sq ft"], ["Max Gross Floor Area (GFA)", "" + fmt(maxGFA) + " sq ft"], ["Actual Lot Coverage", fmt(actualCoveragePct) + "% (limit: " + fmt(maxCoverage) + "%) " + badge(coverageCompliant)], ["FAR Check", "GFA " + fmt(maxGFA) + " sq ft ≤ " + fmt(maxGFAbyFAR) + " sq ft " + badge(farCompliant)], ["Required Open Space", fmt(requiredOpenSpace) + " sq ft (" + fmt(openSpacePct) + "% of lot)"], ["Required Parking Spaces", requiredParkingSpaces + " spaces"], ["Parking Area Required", fmt(parkingAreaRequired) + " sq ft"], ["Net Usable Site Area", fmt(netUsableSite) + " sq ft"], ];

rows.forEach(function(r, i) { var bg = i % 2 === 0 ? '#fff' : '#f9f9ff'; html += '' + '' + r[0] + '' + '' + r[1] + '' + ''; });

html += '';

var summaryColor = overallOK ? '#1a7a1a' : '#b00020';
var summaryText = overallOK
? '✔ Project is within zoning compliance limits.'
'✘ Project exceeds one or more zoning limits. Review highlighted items.';

html += '' + summaryText + '';

resultDiv.style.display = 'block'; resultDiv.innerHTML = html; }

#### Formulas Used

1. Gross Lot Area Gross Lot Area = Lot Width × Lot Depth

2. Buildable Envelope Buildable Width = Lot Width − Left Setback − Right Setback Buildable Depth = Lot Depth − Front Setback − Rear Setback Buildable Envelope = Buildable Width × Buildable Depth

3. Max Footprint by Lot Coverage Max Footprintcoverage = Gross Lot Area × (Max Lot Coverage % ÷ 100)

4. Max Footprint by FAR Max GFAFAR = Gross Lot Area × FAR Max FootprintFAR = Max GFAFAR ÷ Number of Floors

5. Controlling Max Allowable Footprint Max Allowable Footprint = min(Buildable Envelope, Max Footprintcoverage, Max FootprintFAR)

6. Max Gross Floor Area (GFA) Max GFA = min(Max Allowable Footprint × Floors, Gross Lot Area × FAR)

7. Required Open Space Required Open Space = Gross Lot Area × (Open Space % ÷ 100)

8. Required Parking Parking Spaces = ⌈(Max GFA ÷ 1,000) × Parking Ratio⌉ Parking Area = Parking Spaces × Area per Stall

9. Net Usable Site Area Net Usable Site = Gross Lot Area − Required Open Space − Parking Area

#### Assumptions & References

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References

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