General attributes
| Attribute | Value | Comments |
| Location | Amherst, MA | |
| Architect | GO Logic | |
| Builder | Integrity Development and Construction | |
| Bedrooms |
3
|
|
| Bathrooms |
1.5
|
|
| Space | 1300 sq ft | External walls |
| Space | 1000 sq ft | Passive House |
| Certification | Passive House Academy | In progress |
| Blower door test | 0.34 ach | 50 Pa |
Square Footage
Living space only, excluding stairs and storage
| Space | Square feet |
| Main living |
480
|
| 1/2 bath |
23
|
| Upstairs hall |
84
|
| Study |
98
|
| Master bed |
136
|
| Guest bed |
108
|
| Bath |
53
|
| Interior total |
982
|
Exterior
| Item | Type | Comments |
| Walls | 8" SIPs + 6" stud | SIPs from Branch River |
| Windows | Triple pane, tilt and turn | Kneer-Südfenster |
| Siding | Fiber cement | CertainTeed |
| Roof | Standing seam metal | Englert, 24 gauge |
Interior
| Item | Type | Comments |
| 1st floor flooring | Concrete slab | Power troweled and treated with a densifier |
| 2nd floor flooring | White Pine | Square edge 10” |
| Paint | Low VOC | Benjamin Moore Natura |
| Kitchen | IKEA | Applad |
| Countertops | Wood | Maple |
Insulation
| Type | R value | % Area | |
| Walls | 8” EPS foam + 5” blown-in fiberglass |
50
|
46.2%
|
| Windows | Triple pane |
6
|
10.4%
|
| Door | Triple pane |
5
|
0.9%
|
| Roof | 2’ Loose fill cellulose |
100
|
19.3%
|
| Foundation (under) | 10” EPS foam |
25
|
18.1%
|
| Foundation (side, above ground) | 8” EPS foam |
30
|
3.0%
|
| Foundation (side, below ground) | 8” EPS foam |
35
|
2.0%
|
| Weighted average |
49.3
|
100.0%
|
Energy usage
| Energy usage | Value | Comments |
| Lights, appliances, and electronics | 5.2 kWh/d |
50%
|
| Hot water | 3.2 kWh/d |
31%
|
| Heating | 1.7 kWh/d |
17%
|
| Air conditioning | 0.2 kWh/d |
2%
|
| Daily average | 10.4 kWh/d | All electric, estimated by PHPP* |
| Annual | 3781 kWh/a | All electric, estimated by PHPP* |
| Supply | 2 kW PV system | Provides 100% of energy usage |
Appliances
| Fixture | Brand | Model | Price |
| Dishwasher | Miele | G4225SC Futura Classic Dishwasher Prefinished (White) |
$999
|
| Cooktop | Miele | KM5753 Induction Cooktop |
$2,499
|
| Oven | Miele | DGC6800XLBRWS Convection Steam White |
$3,899
|
| Range hood | Vent-a-hood | CWEAH6-K30 250 CFM 30" Wall Mounted Duct-Free Air Recovery System (ARS) |
$2,124
|
| Washer | Miele | W3038 Lotus White Large Capacity |
$1,999
|
| Dyer | Miele | Heat pump, not available in US | |
| Total |
$11,520
|
Hot water
| Item | Model | Min gpm | Max gpm |
| Shower, washer | Stiebel Eltron Tempra 15 |
0.58
|
2.5 (40F) |
| Kitchen sink, dishwasher | Stiebel Eltron DCH 8-2 |
0.58
|
1.5 (33F) |
| 1/2 bath sink | Stiebel Eltron Mini 4 |
0.4
|
1 (24F) |
| Bath sink 1 | |||
| Bath sink 2 | |||
| Heat recover drain pipe | Renewability (3”x6’) |
HVAC
| Model | Efficiency | Comments | |
| HRV | Zehnder ComfoAir 200 |
95%
|
29 to 118 CFM |
| Heat pump outdoor unit | Fujitsu AOU18RLX |
344%
|
HSFP=9.3 Btu/Wh SEER=18 Btu/Wh |
| Heat pump indoor unit (x2) | Fujitsu ASU9RLS2 |
Financial information
Construction costs, all inclusive
| Item | Cost | Cost per sq ft |
| Net construction |
$175,397
|
$135
|
| Architect fees |
$50,000
|
$38
|
| Driveway & excavation |
$48,350
|
$37
|
| Windows |
$22,948
|
$18
|
| SIPs, EPS foam |
$22,140
|
$17
|
| Heat pump & HRV |
$19,224
|
$15
|
| Appliances |
$11,846
|
$9
|
| Concrete slab |
$9,490
|
$7
|
| Passive House certification |
$6,000
|
$5
|
| Standing seam roof |
$7,000
|
$5
|
| Countertops & cabinets |
$4,104
|
$3
|
| Tankless water heaters |
$4,000
|
$3
|
| Plumbing fixtures |
$3,870
|
$3
|
| Electric utility fee |
$3,406
|
$3
|
| Permits |
$2,500
|
$2
|
| HERS rating |
$2,000
|
$2
|
| Energy monitor |
$1,716
|
$1
|
| Lighting fixtures |
$1,031
|
$1
|
| LED light bulbs |
$500
|
$0
|
| Temperature, Voc sensors |
$499
|
$0
|
| Total |
$396,021
|
$305
|
Construction costs, construction only
| Item | Cost | Cost per sq ft |
| Net construction |
$175,397
|
$135
|
| Windows |
$22,948
|
$18
|
| SIPs, EPS foam |
$22,140
|
$17
|
| Heat pump & HRV |
$19,224
|
$15
|
| Concrete slab |
$9,490
|
$7
|
| Standing seam roof |
$7,000
|
$5
|
| Countertops & cabinets |
$4,104
|
$3
|
| Tankless water heaters |
$4,000
|
$3
|
| Plumbing fixtures |
$3,870
|
$3
|
| Lighting fixtures |
$1,031
|
$1
|
| Total |
$269,204
|
$207
|
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