How does the Commercial Building Automation (BAS) & DDC Retrofit Sizer calculate investment returns?

This calculator models net cash flows, cap rates, debt service coverage ratios (DSCR), and internal rate of return (IRR) by accounting for gross revenue, vacancy allowances, operating expenses, and debt amortization.

What expense ratios are recommended for rental underwriting?

Standard real estate underwriting reserves 5%–8% for property management, 5% for economic vacancy, and 5%–10% for ongoing maintenance and capital expenditure (CapEx) reserves.

Can I export these pro-forma financial schedules?

Yes, you can export your complete pro-forma underwriting model directly to CSV, Excel, or printable PDF format for lender presentation.

Commercial Building Automation (BAS) & DDC Retrofit Sizer

⚙️ 1. Facility & Controls Architecture

Conditioned Floor Area (sq ft)

Baseline Controls System

Total DDC I/O Point Count

Modern BAS Protocol / Platform

💡 2. Energy Baselines & Utility Tariffs

HVAC Electric Intensity (kWh/sq ft-yr)

HVAC Gas Heating Intensity (Therms/sq ft-yr)

Blended Electric Rate ($/kWh)

Natural Gas Utility Rate ($/Therm)

📈 3. Sequences, CapEx & Incentives

Control Sequences of Operation

Turnkey Cost per DDC Point ($/pt installed)

Utility RCx / Analytics Rebate ($/sq ft)

IRA EPAct §179D Tax Deduction Rate ($/sq ft)

20-Year Net Value Created (NPV @ 7%)

$342,850

Internal Rate of Return (IRR): 34.2% • Simple Payback: 2.8 Yrs

Annual Utility Savings

$42,150/yr

262,500 kWh • 6,720 Therms

Avoided Maintenance

$6,000/yr

Pneumatic compressors & cal labor

Turnkey Gross CapEx

$208,000

$2.77 / sq ft conditioned

Total Incentives & Rebates

$69,375

Rebate: $18,750 • 179D: $50,625

📊 BAS Controller & Capital Schedule

Component / Metric	Quantity / Allocation	Financial / Performance Impact