Switzerland’s widely adopted spatial policy rejects the use of new land in favour of promoting the densification of existing buildings or brownfield developments. However, to date there has not been an assessment of the volumetric building reserves that are still available within the current building regulatory framework. This paper addresses this lacuna using a case study of the agglomeration of Lausanne. An automated spatial policy model with particular focus on building density and its volume in residential and mixed-use areas allows for building policy to be quantified, assessed and evaluated on a countrywide scale since it takes the location of the building lot into consideration and cross-references it with the correct building regulation. Three-dimensional comparison allows us to identify whether the maximum volume permitted under the building regulation is greater than the current existing building volume. For the test case, spatial policy model identified 38 hectares of available square metres for densification (‘building surplus’ in the context of existing buildings, either in the form of extending existing buildings or infill development) and 93 hectares of square metres available for new developments (brownfield development of vacant or derelict open land) of residential and mixed-use buildings. At the same time, almost all areas are allocated beyond Lausanne’s inner-city boundaries.

瑞士广泛采用的空间政策拒绝使用新土地，以促进现有建筑物或棕地开发的致密化。但是，迄今为止，尚未对当前建筑法规框架内仍然可用的容积式建筑储备进行评估。本文以洛桑（Lausanne）集聚的案例研究解决了这一空白。一个自动的空间政策模型特别关注住宅和混合用途区域中的建筑密度及其体积，允许在全国范围内对建筑政策进行量化，评估和评估，因为它考虑到了建筑地块的位置，并且可以交叉请参考正确的建筑法规。三维比较使我们能够确定建筑法规允许的最大容积是否大于当前的现有建筑容积。对于测试用例，空间政策模型确定了38公顷的可用面积用于致密化（在现有建筑物的背景下，“建筑剩余”以扩展现有建筑物或填充发展的形式）和93公顷的可用面积用于新建筑。住宅和混合用途建筑物的开发（空地或废弃的空地的棕地开发）。同时，几乎所有区域都被分配到洛桑市中心以外的地区。空间政策模型确定了38公顷可用于致密化的可用平方米（在现有建筑物的背景下为“建筑物剩余”，以扩展现有建筑物或填充发展的形式）和93公顷可用于新开发项目（棕地开发）。空置或废弃的空地）。同时，几乎所有区域都被分配到洛桑市中心以外的地区。空间政策模型确定了38公顷可用于致密化的可用平方米（在现有建筑物的背景下为“建筑物剩余”，以扩展现有建筑物或填充发展的形式）和93公顷可用于新开发项目（棕地开发）。空置或废弃的空地）。同时，几乎所有区域都被分配到洛桑市中心以外的地区。