Lake Washington School District
Seattle Metro, Washington, USA
Covering 76 square miles and supporting close to 24,000 students, Lake Washington School District is the public school district for Kirkland, Redmond, and part of Sammamish, just east of Seattle, Washington. The district manages 3.2 million square feet of building property, including 51 elementary, junior high, and high schools.
Since 2007, Rider Levett Bucknall has been working with the Lake Washington School District to develop a Life Cycle Cost model for its medium- and long-range bond planning. Populated using operating and maintenance data from several schools that have been recently constructed, the model indicated that a minimal increase in the capital cost of the building can produce a large savings throughout its useful life.
$650 million in savings
Utilizing input for a sample school project, a Life Cycle Cost model indicated that capital expenditure of $2.1 million could result in a savings of nearly $25 million over the 50 year life cycle of the property (a little over $5 million in net present value). If applied to determine design decision for future schools, this model could save the district approximately $650 million in operational, maintenance and replacement costs over 50 years.
Energy Usage and Carbon Emissions
The Life Cycle Cost model contains data related to the insulating properties of the school, typical exterior temperatures for the region and occupancy loads. From this data, the heat loss of the building is determined, which in turn enables calculation of the energy use and carbon dioxide emissions of the building.
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