LL97 Penalty Calculator — NYC Window Savings Modeler

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This building exceeds LL97 emission limits and faces annual penalties starting in 2024. Window replacement can reduce or eliminate these fines.

Current Annual Penalty

Building is compliant

Emissions 0 / 0 tCO₂e (metric tons of CO₂ equivalent)

Building Energy Profile

Grade

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Energy Star

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Site EUI (Energy Use Intensity)

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GHG Emissions (metric tons CO₂)

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📐 Building Dimensions (from NYC PLUTO — Property Land Use Tax Lot Output)

Frontage

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Depth

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Floors

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Perimeter

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Total Facade

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Est. Window Area

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Facade area = 2×(front+depth) × floors × 12ft. Window area = facade × WWR. 🔮 AI Vision analysis coming soon

🪟 Window Replacement Savings Model

Energy Use Reduction from Window Replacement 15%

5% (Basic) 15% (Standard) 25% (Premium) 35% (Full Envelope)

🏗 Window-to-Wall Ratio (WWR) — % of facade that is glass

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30%

10% Masonry 40% Mixed 65% Glass 80% Curtain

Effective energy reduction (adjusted for window area + heating/cooling share): —

Current Energy Use (kBtu/ft²)

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Projected Energy Use

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Current Emissions (tCO₂)

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Projected Emissions

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New Projected Penalty

Annual Penalty Savings

Projected Grade Change

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Compliance Status

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💵 Financial Impact — Penalty Savings from Window Replacement

Annual Penalty Savings

5-Year Savings (Phase 1)

10-Year Savings (Both Phases)

⚠️ This calculator provides estimates based on NYC Local Law 97 emission limits and typical window replacement energy savings. Actual results may vary based on building-specific factors, window specifications, and installation quality. Penalty rate: $268/tCO₂e over limit. Consult a licensed energy auditor for precise calculations.

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