The RPA I Ecocor base model homes are designed with a shallow frost protected foundation. The foundation includes insulation formwork which stays in place after the concrete slab is poured. This is the most efficient and cost effective type of foundation system for meeting the Passive House standard. Our wall panels and roof can be installed on any type of foundation system including a basement, crawl space, or even piers provided that the proper levels of insulation have been engineered into the foundation.
We provide a base set of approval drawings for you to submit for a building permit. Securing the building permit and all other approvals and inspections are the responsibility of the homeowner.
The square foot cost estimated for an RPA | Ecocor model home is indicative of a “turnkey project,” meaning the price estimate includes all that is required to take occupancy of your prefabricated Passive House.
For contractors or homeowners who may desire to manage completion of a home, the cost is broken down into two line items:
The first line item is for The Ecocor Shell, which includes the raft slab foundation, exterior wall panels, interior walls and doors, the ventilation system, the roof, air-sealing and insulation, windows and exterior doors, siding and exterior trim, equipment rental, travel and transportation cost, and consulting cost.
The second line item is for Elements Provided by Others (local contractors, owner/builders, etc.). This line item includes concrete and rebar, standing seam metal roof, interior finishes, mechanical, electrical, plumbing and the ventilation system installation as well as a number of miscellaneous construction costs.
The estimates provided are based upon average construction cost in the Northeastern United States (regional cost will vary). As with all types of new home construction, the homeowner may decide to alter certain design elements or select fits and finishes that have not been quoted.
The wall assembly used by RPA I Ecocor is engineered to manage water and water vapor very well so our model homes can be designed with or without roof overhangs. Roof overhangs are largely an aesthetic and cost preference for the home owner. For example, one client may select a moisture-resistant exterior cladding with no overhangs while another selects natural wood cladding with overhangs that help maintain the original look of the exterior finish. RPA will help clients select the form and materials that work best for them.
The range of model homes we offer is designed to appeal to a broad range of the home buying market. Interior modifications are provided at a modest additional cost. The cost for modifying the exterior walls and windows is provided on a case-by-case basis. Garages, sheds, breezeways, bris soleil and other shading devices for the southern façade can all be added at an additional cost.
Our model homes are designed to meet the Passive House standard using a raft slab foundation. An optimal site is relatively flat with good access to free solar energy from the sun. The south facing wall should be oriented within 20 degrees of solar south. We can meet the Passive House standard even if these requirements are not meant by adjusting the insulation levels in the slab and roof and adjusting the glazing ratios and glazing specifications.
Once you sign a contract and your model home is in the production schedule, it takes between 2 to 3 months for the Ecocor prefabrication facility in Searsmont, ME to manufacture, deliver, and assemble your model home, provided the site preparation is complete. The foundation can be installed concurrently with the fabrication of your new home, drastically reducing the total construction time Once the model home is set by Ecocor, your home is ready for mechanical, electrical, plumbing, interior and exterior finishes.
RPA | Ecocor is currently servicing climate zones 5, 6, and 7 with plans to expand our offerings for other North American climates and conditions. For example, all RPA | Ecocor homes can be engineered for varying wind loads or seismic activity. We have found that clients in other climate zones where building costs are extremely expensive have found it economical to purchase one of our model homes instead of building on site.
Prefabricated or “Prefab” construction is a method in which both standardized and non-standardized building components are fabricated in a quality-controlled factory environment then shipped to and quickly assembled on site. RPA | Ecocor Prefabricated Passive Houses use patent pending wall components that are certified by the Passive House Institute to meet Passive House levels of airtightness. Prefabrication by Ecocor supports Passive House certification, lessens exposure to the outdoor elements during construction and speeds time to completion.
The prefabricated RPA I Ecocor Model homes range in cost from $190sf to $275sf for the base models delivered anywhere in New England. For cost related to delivering a prefabricated Passive House to your region, go here.
The initial cost of a Passive House building is comparable to standard construction of a similar sized home. Industry estimates find that the construction of Passive Homes can be approximately 0% to 10% more expensive than typical construction. Given the high quality construction of a Passive House, monthly heating and cooling costs can be reduced by as much as 80% to 90%. The financial benefits are quickly realized by the homeowner with reduced cost of ownership. Link to this.
Check out our Passive House Components. Our Panelized Construction approach to passive house building is perfect for all high performance building applications.