CS40 Energy Code Feasibility Study in Boston, Massachusetts
Energy code feasibility study for a 21-unit Multifamily in Massachusetts. Compares multiple design paths. Recommended: Minimum. View full study.
- Study Type
- Energy Code Feasibility Study
- State
- Massachusetts
- Units
- 21
- Building Type
- Multifamily
- Fuel Type
- All-Electric
- Recommended Path
- Minimum
Goal
To find the most cost-effective compliance path, this report isolates energy code related costs from total construction. We use real MA bid data from vendors & clients to create a reliable framework for aligning incentives and design, with all recommendations confirmed by detailed energy modeling.
Project
- Boston, MA 02130
- 21 Units | 62,375 sqft
- 3 stories | 3 residential stories over podium parking | 3-unit building (x7) | Stacked Units
- New Construction | Specialized Opt-In Code | HERS ≤ 45 | All Electric
Overview
Read This: This report compares different ways you can build the project and meet energy code, looking at both cost and incentives, with the ultimate goal as finding the most affordable path.
- The overview outlines the key differences between each of the paths we show in this report and why we recommend the one we picked over the others.
- The recommended design section is where we share the requirements and incentives for the path we think is best based on affordability.
- The path comparison section shows the detailed requirements and incentives for each path we compared, basically showing our work if you want to dig in.
Airtight: This path targets ENERGY STAR NextGen certification, by tightening the building envelope to an ACH50 of 1.5 using AeroBarrier. Achieving this threshold unlocks the upper rebate tier at $20,000 per 3-unit building ($6,667/unit). However, AeroBarrier costs approximately $1.50/sq ft to implement, while the additional incentive gained over the standard path is only $1.12/sq ft, a net loss of $0.38/sq ft. Unless the higher certification carries meaningful marketing or long-term value for the client, the economics do not support this path.
Minimum (Recommended): This path meets code-minimum air sealing requirements and qualifies for ENERGY STAR Multifamily New Construction (MFNC) certification. By forgoing AeroBarrier, it avoids the $1.50/sq ft cost premium while still capturing a strong incentive and delivers a better net cost per square foot than the Airtight Path when the full incentive-to-cost comparison is made. It also reduces scheduling risk and contractor coordination. This is the recommended path: it achieves a certifiable, incentivized outcome with the strongest financial return and the least execution complexity.
Recommended Design
This section outlines the design requirements, product recommendations, and incentives for the design that we believe will be the most affordable path to meeting energy code.
Recommended Design - Incentives
Minimum: $83,650 - $108,850
- MassSave Single-Family (3-Unit) Base Certification ($70,000): You get this rebate for having each unit HERS certified to a score of 45 or less. Certification typically occurs at the end of construction around when certificate of occupancy is received. This rebate comes in the form of a check within 4 months of the certification paperwork being provided to MassSave.
- MassSave Single-Family WIFI enabled Thermostat Adder ($2,100): You get this rebate for installing a WIFI enabled thermostat in each townhome. This is a bonus adder to the Base program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the Base certification paperwork being provided to MassSave.
- MassSave Single-Family Induction Cooktop Adder ($5,250): You get this rebate for installing an induction cooktop in each townhome. This is a bonus adder to the Base program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the Base certification paperwork being provided to MassSave.
- DOER Alternative Energy Credits ($6,300-$31,500): This rebate is received for installing APS eligible air source heat pumps. There is an extensive process to get this incentive. It comes in the form of a check approximately 6-12 months after the heat pumps are installed and fully operational.
- IMPORTANT: Although an estimate is provided, this incentive can vary widely typically between $300-1,500 per heat pump. It’s based on expected kWh usage of the system as well as the market value of the alternative energy credits when sold.
Recommended Design - Units & Common Areas
Item | Detailed Specifications |
|---|---|
Exterior Walls | 2x6 wood-framed walls with R-23 Batt Insulation. |
Podium | R-30 Batt Insulation Resting On Drop Ceiling. |
Rim Joists | Seal interior rim cavity with minimum 3.5" closed-cell spray foam (R-23) for air sealing and thermal performance. |
Roof | R-60 Closed-Cell Spray Foam OR Blown Cellulose |
Windows | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; |
Doors | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; Opaque: U-0.17 (R-5.88); |
Air Sealing | Units: ≤ 0.30 CFM50/sqft of shell area (roughly ACH50 of 5-6) (Air sealing protocol) (Backup plan) |
HVAC | Ducted; split cold climate heat pump; SEER2 17; EER2 12.2; HSPF2 10; (Product Rec) |
Duct Sealing | Total duct leakage shall not exceed 8 CFM25 per 100 sqft of served floor area. (Duct Sealing Protocol - If You Swap To Ducted Systems) |
HVAC Grading | Fan Flow Test: N/A Watt Draw Test: N/A Refrigerant Charge: N/A |
Mechanical Ventilation | L1: 75 CFM, 85% rated recovery; (Product Ref) L2: 75 CFM, 85% rated recovery; L3: 75 CFM, 85% rated recovery; |
Local Mechanical Exhaust | Bathroom(s): ≥ 50 CFM intermittent & ≤ 3.0 sones OR ≥ 20 CFM continuous & ≤ 2.0 sones, Kitchen (s): ≥ 100 CFM intermittent & ≤ 3.0 sones OR continuous, ≥ 5 ACH Based on kitchen volume & ≤ 1.0 sone. Both: Exhaust directly outdoors, ENERGY STAR certified, can utilize ERV to meet these requirements. |
Thermostats | Programmable Thermostat (Option 1) (Option 2) (Option 3) |
DHW | HPWH In Unit (UEF ≥3.88; 80 Gal) (Product Rec) |
DHW Piping | Supply piping insulated to R-3 minimum; Hot water pipe runs optimized to the following lengths: L1 Max Hot Water Pipe Length: 52.79 ft L2 Max Hot Water Pipe Length: 55.1 ft L3 Max Hot Water Pipe Length: 56.3 ft |
Water Fixtures | Watersense Certified Fixtures (Lavatory: ≤1.2 GPM, Shower: ≤2.0 GPM) |
Refrigerator | All: ≤ 700 kWh annual usage; ENERGY STAR; Electric; (Option 1) (Option 2) (Option 3) (Option 4) |
Dishwasher | All: ≤ 240 kWh annual usage; ENERGY STAR; Electric; (Product Rec) |
Clothes Washer | ≤ 136 kWh annual usage; ≥ 2.76 IMEF; ≥ 4.8 cubic ft capacity; ENERGY STAR; Electric; (Product Rec) |
Clothes Dryer | ≥ 6 CEF; ENERGY STAR; Electric; (Product Rec) |
Stove / Oven | Induction Stovetop & Convection Oven; Electric; (Product Ref) |
Lighting | 100% high-efficacy (LED) |
Solar Ready | Applicability: All new R-use buildings (including R-2 multifamily) with ≥600 sqft of roof area oriented 110°–270° of true north Minimum Area: Solar-ready zone ≥300 sqft, exclusive of MA Fire Code access/setback areas Zone Dimensions: May be multiple areas; each area must be ≥5 feet wide and ≥80 sqft (exclusive of fire code setbacks) Obstructions/Shading: Zone must be free of vents, chimneys, and roof equipment; set back from permanently affixed objects (south, east, west) by ≥2x the object's height above the nearest roof surface point Roof Penetration: For roofs with slope ≤8%, provide a capped penetration sleeve with min. 1-1/4" inside diameter Structural: Roof dead and live load documentation on construction documents confirming structure supports a future solar system Interconnection Pathway: Construction documents shall show conduit/plumbing pathways from solar-ready zone to electrical panel (or service hot water system) Panel Reserved Space: Dual-pole breaker space reserved in electrical panel for future solar system Documentation Certificate: Permanent certificate posted near electrical distribution panel indicating solar-ready zone and accommodated system size |
EV Ready | Minimum Circuit: At least 20% of all parking spaces served with a 40-amp, 208/240V branch circuit (min. 9.6 kVA) for AC Level II charging Termination: Circuit shall terminate in a NEMA receptacle or SAE J1772/J3400 connector within 6 feet of each EV ready space Labeling: Circuit labeled EV READY in service/subpanel directory; termination location at parking space also marked EV READY Conductor Sizing: Sized and installed per Massachusetts Electrical Code (527 CMR 12.00) ALMS Option (Exception 3): May comply with C405.13 - ALMS may share circuits per Table C405.13.1 (40A/2 spaces, 60A/4 spaces, 80A/8 spaces); construction documents must include amperage, wiring schematics, ALMS details, and load calculations per C405.13.2 Level I Substitution: Level II spaces may be substituted at a ratio of 3 Level I (20A, 120V) per 1 Level II required |
HPWH Ready | N/A |
Paperwork & Modeling | ERI Energy model, 2021 IECC checklists, ENERGY STAR MFNC checklists, and incentive documentation. |
Testing & Verification | Unit Blower Door Test, Duct Testing, Mechanical Ventilation Testing, Room Balancing, Slab, Predrywall & Final Inspection. |
Exterior Wall Assembly
Podium Assembly
Roof Assembly
Path Comparison
This section shows the detailed requirements and incentives for each path we compared, basically showing our work of how we determined the recommended path is the most affordable way of meeting energy code compliance.
Path Comparison - Incentives
Airtight: $153,650 - $178,850
- MassSave Single-Family (3-Unit) ENERGY STAR Certification ($140,000): You get this rebate for having each townhome ENERGY STAR NextGen certified. Certification typically occurs at the end of construction around when certificate of occupancy is received. This rebate comes in the form of a check within 4 months of the certification paperwork being provided to MassSave.
- MassSave Single-Family WIFI enabled Thermostat Adder ($2,100): You get this rebate for installing a WIFI enabled thermostat in each townhome. This is a bonus adder to the Base program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the HERS certification paperwork being provided to MassSave.
- MassSave Single-Family Induction Cooktop Adder ($5,250): You get this rebate for installing an induction cooktop in each townhome. This is a bonus adder to the ENERGY STAR program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the ENERGY STAR certification paperwork being provided to MassSave.
- DOER Alternative Energy Credits ($6,300-$31,500): This rebate is received for installing APS eligible air source heat pumps. There is an extensive process to get this incentive. It comes in the form of a check approximately 6-12 months after the heat pumps are installed and fully operational.
- IMPORTANT: Although an estimate is provided, this incentive can vary widely typically between $300-1,500 per heat pump. It’s based on expected kWh usage of the system as well as the market value of the alternative energy credits when sold.
Minimum: $83,650 - $108,850
- MassSave Single-Family (3-Unit) Base Certification ($70,000): You get this rebate for having each unit HERS certified to a score of 45 or less. Certification typically occurs at the end of construction around when certificate of occupancy is received. This rebate comes in the form of a check within 4 months of the certification paperwork being provided to MassSave.
- MassSave Single-Family WIFI enabled Thermostat Adder ($2,100): You get this rebate for installing a WIFI enabled thermostat in each townhome. This is a bonus adder to the Base program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the Base certification paperwork being provided to MassSave.
- MassSave Single-Family Induction Cooktop Adder ($5,250): You get this rebate for installing an induction cooktop in each townhome. This is a bonus adder to the Base program and follows the same timelines for submission & receipt of rebate. This rebate comes in the form of a check within 4 months of the Base certification paperwork being provided to MassSave.
- DOER Alternative Energy Credits ($6,300-$31,500): This rebate is received for installing APS eligible air source heat pumps. There is an extensive process to get this incentive. It comes in the form of a check approximately 6-12 months after the heat pumps are installed and fully operational.
- IMPORTANT: Although an estimate is provided, this incentive can vary widely typically between $300-1,500 per heat pump. It’s based on expected kWh usage of the system as well as the market value of the alternative energy credits when sold.
Path Comparison - Net Cost Summary
Path | Total Cost $/sf | Total Incentives $/sf | Net $/sf |
|---|---|---|---|
Airtight | $60.56 | $2.50 | $58.06 |
Minimum | $59.06 | $1.41 | $57.65 |
Path Comparison - Envelope
Item | Path | Detailed Specifications | Cost $/sf | Incentive $/sf | Net $/sf |
|---|---|---|---|---|---|
Exterior Walls | Airtight | 2x6 wood-framed walls with R-23 Batt Insulation. | $3.65 | $0.00 | $3.65 |
Minimum | 2x6 wood-framed walls with R-23 Batt Insulation. | $3.65 | $0.00 | $3.65 | |
Podium | Airtight | R-30 Batt Insulation Resting On Drop Ceiling. | $4.15 | $0.00 | $4.15 |
Minimum | R-30 Batt Insulation Resting On Drop Ceiling. | $4.15 | $0.00 | $4.15 | |
Rim Joists | Airtight | Seal interior rim cavity with minimum 3.5" closed-cell spray foam (R-23) for air sealing and thermal performance. | $0.50 | $0.00 | $0.50 |
Minimum | Seal interior rim cavity with minimum 3.5" closed-cell spray foam (R-23) for air sealing and thermal performance. | $0.50 | $0.00 | $0.50 | |
Roof | Airtight | R-60 Closed-Cell Spray Foam OR Blown Cellulose | $6.65 | $0.00 | $6.65 |
Minimum | R-60 Closed-Cell Spray Foam OR Blown Cellulose | $6.65 | $0.00 | $6.65 | |
Windows | Airtight | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; | $7.00 | $0.00 | $7.00 |
Minimum | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; | $7.00 | $0.00 | $7.00 | |
Doors | Airtight | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; Opaque: U-0.17 (R-5.88); | $0.55 | $0.00 | $0.55 |
Minimum | U-0.30 / SHGC 0.30-0.40; Double Pane Windows; Opaque: U-0.17 (R-5.88); | $0.55 | $0.00 | $0.55 | |
Air Sealing | Airtight | Units: ≤ ACH50 1.5; (Air sealing protocol) (Additional Air Sealing) | $1.65 | $0.00 | $1.65 |
Minimum | Units: ≤ 0.30 CFM50/sqft of shell area (roughly ACH50 of 5-6) (Air sealing protocol) (Backup plan) | $0.15 | $0.00 | $0.15 |
Path Comparison - Mechanical
Item | Path | Detailed Specifications | Cost $/sf | Incentive $/sf | Net $/sf |
|---|---|---|---|---|---|
HVAC | Airtight | Ducted; split cold climate heat pump; SEER2 17; EER2 12.2; HSPF2 10; (Product Rec) | $14.60 | $0.17 | $14.43 |
Minimum | Ducted; split cold climate heat pump; SEER2 17; EER2 12.2; HSPF2 10; (Product Rec) | $14.60 | $0.17 | $14.43 | |
Duct Sealing | Airtight | Total duct leakage shall not exceed 8 CFM25 per 100 sqft of served floor area. (Duct Sealing Protocol - If You Swap To Ducted Systems) | $0.25 | $0.00 | $0.25 |
Minimum | Total duct leakage shall not exceed 8 CFM25 per 100 sqft of served floor area. (Duct Sealing Protocol - If You Swap To Ducted Systems) | $0.25 | $0.00 | $0.25 | |
HVAC Grading | Airtight | Fan Flow Test: N/A Watt Draw Test: N/A Refrigerant Charge: N/A | $0.00 | $0.00 | $0.00 |
Minimum | Fan Flow Test: N/A Watt Draw Test: N/A Refrigerant Charge: N/A | $0.00 | $0.00 | $0.00 | |
Mechanical Ventilation | Airtight | L1: 100 CFM, 82% rated recovery; (Product Ref) L2: 100 CFM, 82% rated recovery; L3: 100 CFM, 82% rated recovery; | $3.00 | $0.00 | $3.00 |
Minimum | L1: 75 CFM, 85% rated recovery; (Product Ref) L2: 75 CFM, 85% rated recovery; L3: 75 CFM, 85% rated recovery; | $3.00 | $0.00 | $3.00 | |
Local Mechanical Exhaust | Airtight | Bathroom(s): ≥ 50 CFM intermittent & ≤ 3.0 sones OR ≥ 20 CFM continuous & ≤ 2.0 sones, Kitchen (s): ≥ 100 CFM intermittent & ≤ 3.0 sones OR continuous, ≥ 5 ACH Based on kitchen volume & ≤ 1.0 sone. Both: Exhaust directly outdoors, ENERGY STAR certified, can utilize ERV to meet these requirements. | $1.50 | $0.00 | $1.50 |
Minimum | Bathroom(s): ≥ 50 CFM intermittent & ≤ 3.0 sones OR ≥ 20 CFM continuous & ≤ 2.0 sones, Kitchen (s): ≥ 100 CFM intermittent & ≤ 3.0 sones OR continuous, ≥ 5 ACH Based on kitchen volume & ≤ 1.0 sone. Both: Exhaust directly outdoors, ENERGY STAR certified, can utilize ERV to meet these requirements. | $1.50 | $0.00 | $1.50 | |
Thermostats | Airtight | Programmable Thermostat (Option 1) (Option 2) (Option 3) | $0.05 | $0.00 | $0.05 |
Minimum | Programmable Thermostat (Option 1) (Option 2) (Option 3) | $0.05 | $0.03 | $0.02 |
Path Comparison - Plumbing & Appliances
Item | Path | Detailed Specifications | Cost $/sf | Incentive $/sf | Net $/sf |
|---|---|---|---|---|---|
DHW | Airtight | HPWH In Unit (UEF ≥3.88; 80 Gal) (Product Rec) | $2.85 | $0.00 | $2.85 |
Minimum | HPWH In Unit (UEF ≥3.88; 80 Gal) (Product Rec) | $2.85 | $0.00 | $2.85 | |
DHW Piping | Airtight | Supply piping insulated to R-3 minimum; Hot water pipe runs optimized to the following lengths: L1 Max Hot Water Pipe Length: 52.79 ft L2 Max Hot Water Pipe Length: 55.1 ft L3 Max Hot Water Pipe Length: 56.3 ft | $0.15 | $0.00 | $0.15 |
Minimum | Supply piping insulated to R-3 minimum; Hot water pipe runs optimized to the following lengths: L1 Max Hot Water Pipe Length: 52.79 ft L2 Max Hot Water Pipe Length: 55.1 ft L3 Max Hot Water Pipe Length: 56.3 ft | $0.15 | $0.00 | $0.15 | |
Water Fixtures | Airtight | Watersense Certified Fixtures (Lavatory: ≤1.2 GPM, Shower: ≤2.0 GPM) | $0.50 | $0.00 | $0.50 |
Minimum | Watersense Certified Fixtures (Lavatory: ≤1.2 GPM, Shower: ≤2.0 GPM) | $0.50 | $0.00 | $0.50 | |
Refrigerator | Airtight | All: ≤ 700 kWh annual usage; ENERGY STAR; Electric; (Option 1) (Option 2) (Option 3) (Option 4) | $0.40 | $0.00 | $0.40 |
Minimum | All: ≤ 700 kWh annual usage; ENERGY STAR; Electric; (Option 1) (Option 2) (Option 3) (Option 4) | $0.40 | $0.00 | $0.40 | |
Dishwasher | Airtight | All: ≤ 240 kWh annual usage; ENERGY STAR; Electric; (Product Rec) | $0.20 | $0.00 | $0.20 |
Minimum | All: ≤ 240 kWh annual usage; ENERGY STAR; Electric; (Product Rec) | $0.20 | $0.00 | $0.20 | |
Clothes Washer | Airtight | ≤ 136 kWh annual usage; ≥ 2.76 IMEF; ≥ 4.8 cubic ft capacity; ENERGY STAR; Electric; (Product Rec) | $0.40 | $0.00 | $0.40 |
Minimum | ≤ 136 kWh annual usage; ≥ 2.76 IMEF; ≥ 4.8 cubic ft capacity; ENERGY STAR; Electric; (Product Rec) | $0.40 | $0.00 | $0.40 | |
Clothes Dryer | Airtight | ≥ 6 CEF; ENERGY STAR; Electric; (Product Rec) | $0.50 | $0.00 | $0.50 |
Minimum | ≥ 6 CEF; ENERGY STAR; Electric; (Product Rec) | $0.50 | $0.00 | $0.50 | |
Stove / Oven | Airtight | Induction Stovetop & Convection Oven; Electric; (Product Ref) | $0.40 | $0.08 | $0.32 |
Minimum | Induction Stovetop & Convection Oven; Electric; (Product Ref) | $0.40 | $0.08 | $0.32 |
Path Comparison - Electrical
Item | Path | Detailed Specifications | Cost $/sf | Incentive $/sf | Net $/sf |
|---|---|---|---|---|---|
Lighting | Airtight | 100% high-efficacy (LED) | $3.50 | $0.00 | $3.50 |
Minimum | 100% high-efficacy (LED) | $3.50 | $0.00 | $3.50 | |
Solar Ready | Airtight | Applicability: All new R-use buildings (including R-2 multifamily) with ≥600 sqft of roof area oriented 110°–270° of true north Minimum Area: Solar-ready zone ≥300 sqft, exclusive of MA Fire Code access/setback areas Zone Dimensions: May be multiple areas; each area must be ≥5 feet wide and ≥80 sqft (exclusive of fire code setbacks) Obstructions/Shading: Zone must be free of vents, chimneys, and roof equipment; set back from permanently affixed objects (south, east, west) by ≥2x the object's height above the nearest roof surface point Roof Penetration: For roofs with slope ≤8%, provide a capped penetration sleeve with min. 1-1/4" inside diameter Structural: Roof dead and live load documentation on construction documents confirming structure supports a future solar system Interconnection Pathway: Construction documents shall show conduit/plumbing pathways from solar-ready zone to electrical panel (or service hot water system) Panel Reserved Space: Dual-pole breaker space reserved in electrical panel for future solar system Documentation Certificate: Permanent certificate posted near electrical distribution panel indicating solar-ready zone and accommodated system size | $0.05 | $0.00 | $0.05 |
Minimum | Applicability: All new R-use buildings (including R-2 multifamily) with ≥600 sqft of roof area oriented 110°–270° of true north Minimum Area: Solar-ready zone ≥300 sqft, exclusive of MA Fire Code access/setback areas Zone Dimensions: May be multiple areas; each area must be ≥5 feet wide and ≥80 sqft (exclusive of fire code setbacks) Obstructions/Shading: Zone must be free of vents, chimneys, and roof equipment; set back from permanently affixed objects (south, east, west) by ≥2x the object's height above the nearest roof surface point Roof Penetration: For roofs with slope ≤8%, provide a capped penetration sleeve with min. 1-1/4" inside diameter Structural: Roof dead and live load documentation on construction documents confirming structure supports a future solar system Interconnection Pathway: Construction documents shall show conduit/plumbing pathways from solar-ready zone to electrical panel (or service hot water system) Panel Reserved Space: Dual-pole breaker space reserved in electrical panel for future solar system Documentation Certificate: Permanent certificate posted near electrical distribution panel indicating solar-ready zone and accommodated system size | $0.05 | $0.00 | $0.05 | |
EV Ready | Airtight | Minimum Circuit: At least 20% of all parking spaces served with a 40-amp, 208/240V branch circuit (min. 9.6 kVA) for AC Level II charging Termination: Circuit shall terminate in a NEMA receptacle or SAE J1772/J3400 connector within 6 feet of each EV ready space Labeling: Circuit labeled EV READY in service/subpanel directory; termination location at parking space also marked EV READY Conductor Sizing: Sized and installed per Massachusetts Electrical Code (527 CMR 12.00) ALMS Option (Exception 3): May comply with C405.13 - ALMS may share circuits per Table C405.13.1 (40A/2 spaces, 60A/4 spaces, 80A/8 spaces); construction documents must include amperage, wiring schematics, ALMS details, and load calculations per C405.13.2 Level I Substitution: Level II spaces may be substituted at a ratio of 3 Level I (20A, 120V) per 1 Level II required | $0.65 | $0.00 | $0.65 |
Minimum | Minimum Circuit: At least 20% of all parking spaces served with a 40-amp, 208/240V branch circuit (min. 9.6 kVA) for AC Level II charging Termination: Circuit shall terminate in a NEMA receptacle or SAE J1772/J3400 connector within 6 feet of each EV ready space Labeling: Circuit labeled EV READY in service/subpanel directory; termination location at parking space also marked EV READY Conductor Sizing: Sized and installed per Massachusetts Electrical Code (527 CMR 12.00) ALMS Option (Exception 3): May comply with C405.13 - ALMS may share circuits per Table C405.13.1 (40A/2 spaces, 60A/4 spaces, 80A/8 spaces); construction documents must include amperage, wiring schematics, ALMS details, and load calculations per C405.13.2 Level I Substitution: Level II spaces may be substituted at a ratio of 3 Level I (20A, 120V) per 1 Level II required | $0.65 | $0.00 | $0.65 | |
HPWH Ready | Airtight | N/A | $0.00 | $0.00 | $0.00 |
Minimum | N/A | $0.00 | $0.00 | $0.00 |
Path Comparison - Soft Costs
Item | Path | Detailed Specifications | Cost $/sf | Incentive $/sf | Net $/sf |
|---|---|---|---|---|---|
Paperwork & Modeling | Airtight | ERI Energy model, 2021 IECC checklists, ENERGY STAR MFNC checklists, ENERGY STAR NextGen and incentive documentation. | $7.41 | $2.24 | $5.16 |
Minimum | ERI Energy model, 2021 IECC checklists, ENERGY STAR MFNC checklists, and incentive documentation. | $7.41 | $1.12 | $6.28 | |
Testing & Verification | Airtight | Unit Blower Door Test, Duct Testing, Mechanical Ventilation Testing, Room Balancing, Slab, Predrywall & Final Inspection. | $0.00 | $0.00 | $0.00 |
Minimum | Unit Blower Door Test, Duct Testing, Mechanical Ventilation Testing, Room Balancing, Slab, Predrywall & Final Inspection. | $0.00 | $0.00 | $0.00 |
Additional Design Considerations Not Represented In This Study
- N/A