Build-out analyses allow planners to estimate the amount and location of development for an area. Performing a build-out analysis is the step in the community planning process that identifies the holding capacity of the land. Build-out is a supply-side calculation applied to a clearly delineated area that is based on assumptions for density, physical constraints to development, and land-use regulations that define the size and placement of structures for that area. A build-out analysis provides an answer to the question "how many buildings could be built in this area according to current land-use regulations?" A build-out analysis provides a convenient reference for future planning because it represents a theoretical maximum. It does not imply or forecast how many buildings will actually be built.
Traditionally, planners have performed build-out analyses by using spreadsheet tables to associate build-out assumptions with a hard copy map. GIS improves this technique by associating the digital land-use plan with a database of associated attributes. The Scenario 360 Build-Out Wizard automates the entire build-out process. The Wizard guides users through the choices and selections that will form the basis of a build-out analysis.
Build-out analysis results will reflect the remaining capacity for an area (they will not include the existing buildings). You can estimate the number, location, and appearance of buildings based on land-use or zoning information. You can set density assumptions in dwelling units per area, minimum lot size per dwelling unit, or floor area ratio. You can also assign design assumptions, including layout efficiency, building offsets, development constraints, layout pattern, and building type to your analysis.
There are many uses for build-out analyses. For example, you can determine:
What impact changing the zoning classification would have on the number of buildings an area could hold.
What would happen if you changed the allowed density.
What impact modifying the efficiency factor based on local conditions would have. For example, the factor for medium density residential might be 80%, but in steep areas it might reduce to 60%.
How using different constraints would spatially limit where development may take place.
The build-out process contains 3 separate, but integrated steps: numeric, spatial, and visual. Each of theses has certain data requirements and numerous options. A Build-Out Tutorial is available from your CommunityViz distributor.
See also: Decision Tools