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Lincoln Net Positive Farmhouse

Building Details

Building NameLincoln Net Positive Farmhouse Construction / refurbishment date01/05/2017 Building Size394.8 sqm
Building Typeresidential single Address 5 Farrar Rd Lincoln Massachusetts 1773 United States Region americas

Performance Details

Net Zero Operational Carbon

Buildings or developments that display best practice outcomes in energy efficiency, are powered by renewable energy, and as such have been verified and certified as "net zero energy and/or carbon" projects.

Qualification criteria: ILFI Zero Energy Certificate level: Zero Energy Net EUI: 25.8 kWh/m2/yr Net RPI: 43.4 kWh/m2/yr Net Offset Ren Energy Src: Net Offset Details: Net Verification Year: 2017

Additional Details

This modern farmhouse blends into the cultural landscape of Lincoln, Massachusetts – a town known for its rich history, farming traditions, conservation efforts, and visionary architecture. The President of Thoughtforms, an accomplished builder in the greater Boston area, and his wife collaborated with ZED to design and build a new single-family home that respects the neighborhood’s agrarian roots, produces more energy than it consumes, and provides the family with flexible spaces to live-play-work-entertain. The resulting 2,800 SF home is proof that families do not need to compromise on style, space or comfort in a highly energy-efficient and healthy home. Generous ceiling height, natural light, and views to the outdoors expand the modest footprint. A break from the current trend towards open plans, the kitchen, and dining area are paired but separate from the living area. The generously glazed dining area looks onto the south facing front lawn. Each space in the house must serve a specific use, but also be flexible for atypical scenarios. The living area with views to the front and backyard includes an Away Room for watching movies and playing the piano. It can be closed off with its oversized pocket door for secondary use as a first-floor guest bedroom with en-suite bath, ideal for elderly or disabled guests. The Mudroom serves the everyday use for the couple and their children but is also used to receive guests, eliminating the need for two entries found in most homes. Similarly, the third-floor attic creates a flexible space for play, crafts, and overnight guests, in addition to housing mechanical equipment and ducts. The attached garage is ubiquitous in new construction in New England’s cold climate. This home’s barn-inspired garage is detached from the primary dwelling. A covered walkway connects the two structures, creating an intentional connection with the outdoors between auto and home. The detached structure also includes an insulated, but not conditioned, exercise area that looks onto the backyard. The raised planting beds in the backyard also pair well with the root cellar in the basement, carved out of the thermal envelope for long-term energy free storage.

The all-electric home consumes 70% less energy than a code-built house, and with measured energy data produces 48% more energy annually than it consumes, making it a ‘net positive’ home. The super-insulated walls and roofs are free of thermal bridges by using dense-packed cellulose within the wood framing, paired with continuous rigid insulation. High performance, triple-glazed windows round out the super-insulated building envelope. The continuous air barrier yields minimal leakage, with testing revealing only .27ACH50, making the home among the tightest in the US. An air source heat pump and an energy recovery ventilator (ERV) ensure that the house stays warm in the winter, cool in the summer, and provide a constant supply of fresh, clean air throughout the year. Heat pumps hot water heater, Energy Star appliances, and induction cooktop complete the high-efficiency package. A 13.1kW array of solar panels produces more than enough energy each year to offset consumption. A circuit-by-circuit energy monitoring system allows the owners and architect to track their energy consumption and production. The home’s net positive energy offers shelter from future heating & cooling costs, superior thermal comfort, and yields enough energy to support a future electric car for the family.

The south facing, high performance, triple-glazed windows with a high solar heat gain coefficient take advantage of passive solar gain in the wintertime, which helps to decrease the heating loads.

You can find out more about this case study from ILFI here.

Submitter's Details

OrganisationInternational Living Future Institution

The all-electric home consumes 70% less energy than a code-built house, and with measured energy data produces 48% more energy annually than it consumes, making it a ‘net positive’ home.