BDR Holdings: Sonata at Columbia Station

Positioned on the corner of S Alaska St. and Martin Luther King Jr. Way S near the Columbia City light rail station, this new 91-unit transit-oriented development is certified both Built Green 4-Star and National Green Building Standard (NGBS) Bronze level. Committed to building green, BDR Holdings’ Sonata building obtained 535 points on the multifamily checklist—135 points over the required 400 points for 4-Star.

Some of the Built Green credits that aided them in achieving their high score were using low-toxicity, low-VOC products, no added urea formaldehyde (NAUF) millwork and cabinets, and CRI Green Label Plus carpets throughout the building. Part of their energy savings comes from the centralized high-efficiency gas water heater, the extra roof insulation above the sheathing, and the rooftop PV array. Outside of the building, all landscaping is drought-tolerant, surfaces are pervious to allow for water infiltration, and nontoxic outdoor materials were used to finish off landscaping.

Vital Stats	Section	Points
Location: Seattle Star Level: 4-Star Checklist: Multifamily Residential New Construction (v. 2009) Verifier: Evergreen Certified	Site and Water	194
	Energy Efficiency	117
	Health and Indoor Air Quality	135
	Material Efficiency	89
	Total Score	535

Sonata offers a mix of studios, 1-bedrooms, and 2-bedrooms, along with an abundance of amenities for the tenants. Amenities include a rooftop deck with a viewing area for outdoor movies, fire pits, a barbecue for grilling, and a pet relief station. Within the building, you’ll find a heated bike storage room with a separate entrance to avoid tracking contaminates throughout the building, onsite storage, and common spaces for residents to socialize.

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star exterior with mountain view and nearby light rail. Photo credit: Heiser Media

Built Green Highlights

Site and Water

Nontoxic outdoor material used for landscaping
Drip irrigation with rain sensor
Low-flow lavatory, showerheads, and kitchen fixtures
Rooftop community space accessible to all tenants
Transit-oriented development

Energy Efficiency

A ceiling fan in all units
Units sub-metered for water and electricity
High-efficacy lighting with motion sensor dimmers
Energy Star appliances

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star roof deck. Photo credit: Heiser Media

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star kitchen. Photo credit: Heiser Media

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star living room with ceiling fan. Photo credit: Heiser Media

Health and Indoor Air Quality

Non-smoking building
VaproShield WRB with rainscreen beneath the siding
Foundation drainage mat
Quiet Energy Star exhaust fans

Materials Efficiency

Longer-lasting materials used on and in the building
Finished concrete floors on main level
Recycling and trash stations on every level
Abundant use of locally produced materials
+40% recycled content carpet tiles in the hallways
+40% recycled content insulation used throughout

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star tenant common space. Photo credit: Heiser Media

BDR Holdings Sonata Apartments at Columbia Station Built Green 4-Star bicycle storage room. Photo credit: Heiser Media

Photos provided by Heiser Media.

Built Green Hammer Award Winners

Isola Homes is a locally rooted, family-owned company with a passion for building exceptional homes. They collaborate and strive to bring the very best in sophisticated design, modern livability, and unmatched quality in Seattle’s most desirable locations. Their ultimate goal is to create a place that inspires you to live with the same passion that they had for building your home. Over the past year, they have certified 114 homes with Built Green: seventeen at the 3-Star level, 92 at 4-Star, and five at 5-Star.

DEP Homes strives to provide the Seattle housing market with quality homes that are technologically advanced and environmentally responsible. Their homes are strategically located in desirable neighborhoods in order to promote sustainable living through convenient access to shopping, public transportation, and major employers. In the last year, they have realized their vision for elegant sustainability through major projects like “DEP City 15” and “DEP Columbia.” Over the past year, they have certified 39 homes as 4-Star Built Green.

DevCo, Inc. is a privately held real estate investment company, and Heartland Construction is their construction affiliate that is responsible for building all of their projects. With more than 20 years of experience, together they professionally develop, build, and own multi-family apartment communities. Some unique aspects of the Discovery West project were the use of a common domestic hot water system, high energy efficient HVAC system for the common areas in the buildings, and use of low- or no VOC and eco-friendly finish materials throughout the interiors of the buildings. Heartland Construction has done an excellent job incorporating Built Green Standards seamlessly into the project. Their experience on the first two developments helped them to understand the process so the certification process on this project was completed rapidly. Their most recent certification was for 209 4-Star units.

Aegis Living was chosen for this award for their brand new, 129-unit Aegis of Queen Anne at Rodgers Park assisted living community development. The Aegis of Queen Anne at Rodgers Park project met and surpassed Built Green 4-Star requirements. The development collects and retains 80% of storm water and building water discharge; used only low-VOC and low-toxic interior paints and finishes for all surface areas (including doors, windows, and trim); controlled building moisture; used effective air distribution and filtration systems; sent at least 85% of jobsite waste to a local recycling center; and maximized efforts to install locally-produced materials (local windows, cement, and wood).

Sola 24 LLC achieved Built Green 4-Star certification for a 23-unit project in Seattle this past year. Their premise was simple - super tight buildings consume less energy for heating and cooling. In order to achieve this, they used spray foam insulation to achieve a virtually airtight building shell. In addition, all penetrations, such as lights, switches, and outlets were sealed with caulking or gaskets and large, high-tech Andersen E-Series windows that provide natural daylight for both light and warmth. This combination of efficiency and natural light makes the spaces inviting and relaxed.

Fairwinds Development is a family-owned, father-and-son-operated developer of single-family and low density multi-family homes in North Seattle neighborhoods. The Eltovar rowhouse project that they have been working on this past year is an example of a certified 4-Star Built Green project. Over the past year, they have achieved certification for nine 4-Star projects.

This past year Malboeuf Bowie Architecture certified a 5-star remodeled home in the Wedgewood Neighborhood– the only 5-Star remodel so far in 2016. They kept the foundation (minimizing ground disturbance) and installed a new concrete slab floor with hydronic radiant heating. With a 6.4 kW solar PV system, the home is modeled to perform 45% better than new homes built to code.

Model Remodel’s backyard cottage in Seattle’s Columbia City neighborhood received Built Green 4-Star certification for its calculated design and mindful construction. Durability, energy efficiency, and overall user-healthiness come together in this comfy second story studio dwelling atop a two-car garage. The trees around the unit offer privacy and the feeling of a tree house while the windows on the north and south open to carry the cool, aromatic, Lake Washington breeze through during the summer heat.

The two units by TC Legend Homes are stunning examples of healthy, sustainable, and energy efficient single-family homes. Located on two peaceful wooded lots in the Victory Heights neighborhood of Seattle, the outward appearance of these 5-Star dwellings belie their advanced construction and ultra-high performance. The homes are constructed using Structural Insulated Panels (SIPs) which is one of the trademarks of builder Ted Clifton, a leading figure in the net-zero energy building community. TC Legend Homes also included many advanced energy efficiency measures in addition to the 9.5 kW solar arrays on each roof. They also meet 100% rainwater infiltration on site, have continuous exhaust ventilation, and used salvaged materials from the previous home.

Built Green Pioneer Award

David Barnes

Sam Lai

Aaron Fairchild

The Built Green Pioneer Award this year was award to David Barnes, Sam Lai, and Aaron Fairchild. David Barnes pioneered the green building priority permit review in the City of Kirkland as well as makes a big effort to reach out and loop builders into the Built Green program.

Sam Lai and Aaron Fairchild, both of Green Canopy, have worked tirelessly to support Built Green and have come up with idea after idea to better the program. They played a huge role in the conference this year and in the past. Sam Lai sits on the Built Green Marketing Subcommittee and Aaron Fairchild was on the Built Green Executive Committee and now is an MBA Board Member.

While it was difficult to select the nominees and award recipients from such a talented, hard working group of Built Green members, we wish to thank everyone who has been involved with and helped Built Green over the course of this year. We are already looking forward to next year’s Built Green Conference and sincerely hope you will join us!

built-green-conference-2016-award-winners

Built Green™

09/22/2017

Why Energy Models?

Built Green 4-Star project by Denizen Development LLC

Most builders pursuing Built Green certification quickly realize that the energy model of their project is one of the keys to achieving a given star-level. Almost all Built Green star-levels for nearly all certification types (Community certification and Refit certification being the exceptions) require an energy model.

How does this work? Why is this the case? Let us explain.

What is an energy model?

An energy model is a projection of how much energy a home will use, given its design and equipment. Energy models are extensively researched and widely accepted, but they are also an estimate of how much energy a home will use. There is no way to account for certain variables, occupant behavior being a big one. However, models can be very useful tools for judging a home’s efficiency and for comparing the likely benefits of different efficiency strategies.

There are many ways to perform an energy model and models may vary in their intricacy, in part due to different software tools that can be used. Built Green’s modeling protocol is based on the software REM/Rate for single-family models and on eQuest for larger, multifamily models.

Built Green’s… modeling protocol?

Yes, Built Green has a modeling protocol to ensure that projects are all being modeled the same way. On top of the different modeling tools, modeling is not an exact science and two different modelers could make two different decisions in how to account for certain components, with neither necessarily incorrect. To standardize our process and make sure that Built Green certification means the same thing for different projects, Built Green introduced modeling protocols to guide third-party verifiers and modeling experts. The protocols are designed with the input of experts and with the aim of making Built Green as accessible as possible for builders, while at the same time ensuring Built Green qualifies for various incentives. Third-party verifiers are a great resource for questions about modeling since they are the ones who often do the model or who work with the person doing the model.

So why a model?

Built Green is a certification that represents a building’s environmental gains above code. One of these gains is energy efficiency. Thus, projects need to demonstrate to Built Green that their energy consumption will be less than a similar code home and Built Green needs to demonstrate to governments and utilities that offer green building incentives that the program is meeting expectations. A model does just that.

What does the model show exactly?

Since Built Green is a regional certification, we look at improvement beyond the Washington State Energy Code. Models, therefore, show the percentage improvement of a Built Green home over its performance had it only been built to code. In other words, a model shows how much energy a home would use with code-compliant design and equipment and how much energy it would use as actually designed—the difference between the two being the energy reduction achieved by green upgrades and smart design. Built Green requires a 10% improvement over code for 3-Star certification, 20% for 4-Star, and 30% for 5-Star. Emerald Star homes must be net zero energy, which means these homes must consume the same or less energy than they produce via renewable energy in a year. These levels ensure Built Green certification carries meaning and acts a basis for incentives that benefit green builders.

Models are complicated; there is no doubt about that! Hopefully this post explains their purpose and how Built Green utilizes them. If you want to do a deep dive into the details of our modeling protocol, reach out to your third-party verifier for project specifics or to us for general information!

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Built Green™

11/30/2021

Resiliency and Peace of Mind—Coupling Solar PV with Battery Storage

Author: Nina Olivier, Built Green Coordinator

Solar batteries, when connected to a home solar system, provide an attractive return on investment, increase the value of your property, and help the country take steps towards energy independence.

Installing a solar battery storage solution provides the greatest benefit to homeowners who live in areas that experience frequent power outages, where full-retail net metering isn’t offered, or where battery incentives are available.

When solar panels are paired with a home battery, the excess electricity goes into the battery instead of going to the grid. As a result, when the sun goes down and your panels aren’t producing electricity anymore, you can use the energy you have stored in your battery—instead of paying for electricity from the utility.

A+R Solar install

Investment Opportunities in Battery Systems

Given local proposed rate increases for utilities, solar PV systems and battery storage are becoming a more economically viable option. The style of battery greatly affects how the batteries are used and how long they last. Many factors contribute to variability in battery life including temperature, proper discharge and recharge, and optimal application usage.

Average household batteries cost anywhere from $4000 for a small 4kWh battery up to $15,000 or more for a large 13kWh battery depending on the type of battery, installation location, backup power requirements, and type of inverter used. To give some perspective, an average 3-bedroom home uses around 20kWh of electricity per day. However, a lot of this energy is used during daylight hours and could be directly powered by solar alone. Therefore, a moderately sized 10kWh battery would generally be large enough to cover the evening and overnight periods. However, every household is different, and usage patterns can vary greatly. For those that are more energy conscious and use efficient appliances, a smaller 6kWh battery may be suitable.

The payback period or return on investment (ROI) for most battery systems is around 7–10 years. It’s generally more cost-effective to install rooftop solar and run efficient appliances or heat hot water during the day rather than store excess energy in a battery. However, for some people, the value and security of having a reliable, sustainable power supply easily outweighs the cost.

The high cost of clearing trees, creating access roads, and building power poles can be prohibitive to getting power in remote locations. After recent grid events in Texas and California, the value of battery backup is harder to ignore. In states like Hawaii, residents are even required to store energy because there are restrictions in place that do not allow for the export of excess solar power to the grid.

Incentives and Financial Assistance for Washington State

Congress extended the federal solar tax credit (known as the ITC) for an additional two years. This means that you’ll receive a tax credit of 26% of your system’s cost in 2021 and 2022 and 22% in 2023. If the full value is not used within one year, the remainder will roll into the next year. Federal tax incentives can also be extended to home battery storage systems.

The 100% Clean Electricity Act passed in 2019 by the Washington State Legislature removes the sales tax for most typical residential solar energy systems and offers some sales tax relief for larger commercial scale systems. For the average customer, that means you save around 10 percent right off the bat.

In addition, the Rural Energy for America Program (REAP) provides grants and loans to farmers and rural businesses to help them purchase renewable energy systems and make energy efficiency improvements by paying up to 25 percent of the project. To see all available renewable energy incentives available in your zip code please visit the Database of State Incentives for Renewables & Efficiency (DSIRE).

Leading Solar Energy Storage Batteries

Solar energy storage options have been rapidly evolving and improving over the last decade and are no longer limited to large, inefficient, and unattractive nickel-iron storage systems. Now sleek, sophisticated, high performing, and long-lasting storage options are readily available. Examples are listed below with typical prices (2021 retail prices).

Tesla

Since 2015, Tesla has been at the front of the pack in the production of dependable residential solar batteries. Their flagship model, the Tesla Powerwall, is pegged by critics to be the best in the range. The Powerwall is a stackable solar battery that has a capacity of 13.5 kWh and is enough for the average home’s energy needs. Tesla has developed its lithium-ion battery in partnership with Panasonic, and the resulting product is believed to be of very high quality. The cost of one battery unit is around $10,100.

LG

LG is one of Tesla’s main rivals in the solar battery market. It has a battery model called the LG Chem solar battery system. At 9.3 kWh, the LG Chem is a decent solar battery that should be able to power a home that does not have massive power-consuming machines. It is best suited for homes that are connected to a power utility grid. Including installation charges, the LG solar battery can cost between $11,000 and $13,000.

Sonnen

Sonnen is a fast-growing German company founded in 2010. It has a share in the European and American markets through a network of agents and installers. Sonnen’s Eco battery core unit has a small capacity of 4 kWh but can be stacked to 16 kWh. Smart software within the battery system stores data relating to your home’s energy needs. It then uses the information to provide you with a genuinely futuristic solar experience. With pre-installation costs of $9000, the Sonnen Eco is an expensive solar battery. However, each battery comes with a warranty of functioning at 70% of optimum levels for ten years, which is higher than that of competitors.

The following table shows other leading solar storage energy batteries currently available on the market:

Credit: Clean Energy Reviews

A&R Solar, a local solar installation company, explains that in addition to achieving energy independence and reducing your carbon footprint, solar is a wise investment with positive financial returns. A&R Solar recommends roof-top mounted grid tied solar coupled with a double Tesla Power Wall system for a typical single-family home.

The following are price estimates for a typical single-family home provided by A&R Solar using their recommended Tesla Power Wall or SolarEdge Energy Hub systems:

Credit: A&R Solar

Achieving Total Energy Independence and Resiliency

Solar PV plus batteries boosts a home’s resiliency to power outages where gird electricity may be off for a few hours or for several days. The battery provides the means to avoid the use of fossil fuel burning generators to power the home in the event of an outage. In addition, unlike generators, solar panels and battery storage systems don’t create noise and air pollution that will bother you or your neighbors. This is a unique benefit and is a great way for anyone who currently has a generator to update their system.

Learn more about how A&R Solar provides solar and storage to build a homes resiliency during an outage:

Batteries can be used to store solar energy and then allow the owner to utilize battery power at night or anytime to reduce the purchase of highest cost of peak power. Utilities often charge the highest per kWh rate for electricity used during the peak time of day or season. Battery power can also be used to keep the building’s total grid energy usage low over time to ensure the customer is paying for the lowest price in a tiered rate structure.

In a remote location, or any location that doesn’t have an electrical grid, the combination of solar PV and batteries can supply reliable ongoing electricity to power typical household functions. Unlike grid-tied solar systems, off-grid systems have no connection to the utility grid and must make all the electricity necessary to power the home.

Credit: Lopez Community Land Trust

The Path to Community Microgrids

To meet climate action goals, many large utilities are looking to generate more electric power through solar and wind. Currently there are challenges with large scale utility storage and energy transmission. Microgrids have been shown to alleviate these challenges through functioning like a smaller version of a larger traditional electrical grid powered by solar with battery storage systems. With the increased cost of traditional grid power generated from fossil fuels, many microgrids are switching to a combination of solar and battery storage to supply electricity that is cost effective and has environmental benefits.

They provide opportunities for optimal solar placement and scalability, as they do not need to be placed on home roofs—they can be installed on parking garages, open fields, etc.—reducing roof penetrations and complexity during roof repairs and replacements. Microgrids also achieve resiliency by islanding from the central grid during an outage. Community microgrids represent a new approach for designing and operating the electric grid that achieves a more sustainable, secure, and cost-effective energy system while providing indefinite, renewables-driven backup power for prioritized loads.