General Data
Name of instrument Minimum limitation of floor-space-index (= unteres Limit der Geschossflächenzahl)
Country DE
Spatial level local
Type Spatial planning instrument
Subtype Formal planning instrument
Description Part of the local land development plan. A high density of housing units is reflected in a high floor-space-index (residential area across all floors/plot area) between 1,0 and 2,0.
General objectives Densification of newly constructed residential areas. Minimizing length of technical infrastructure per household.
General objectives keywords inner-urban densification; Building regulations; municipal infrastructure costs;
Responsible Local authority/Municipal council
Stakeholder Involved Private individuals; Planners; Entrepreneurs/businessmen;
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General assessment of strength and weakness Strength: Easy to implement as the floor-space-index is a mandatory regulation of the local development plan. Density as a positive feature of residential areas can be communicated using economic arguments, as infrastructure costs per household are considerably lower in high-density areas Instrument is particularly promising if coordinated with public transportation departments (see (win-win-effect, more residents increase public transport revenues, better public transport accessibility increases attractiveness of high-density-areas.
Weakness: Relationship between density and infrastructure costs is not linear, that means that at a certain point, the economies of scale that result from high densities are compensated by social effects such as vandalism etc. Therefore, density needs to be carefully considered and assessed, taking into account local requirements such as building traditions, social fabric of the community and the urban housing context.��
Date of entry 30.01.2007
Legal status not-mandatory for responsible body, BUT mandatory for end-user
Extension rarely (< 25%)
Comment As mandatroy specification of the building permit, the floor-space-index has by law to be acknowledged an implemented by the land developer.
Type of monitoring other (see comment)
Preconditions for implementation
General comment
Status very strong direct relevance
Ranking 5
Status municipal administration, local economy, environmental NGOs, superordinate administration
Ranking 4
Remark the acceptance depends on several local factors and may differ from place to place even in the same municipality (see weakness of the instrument)
Ranking 5
Remark Widespread implememtation of instrument, but not sufficiently strict with minimimum limits.
Status Legislation and political will
Ranking 4
Status Direction of effect and perpetuity
Ranking 2
Remark Acceptance of high density is difficult to assess ex-ante, therefore type of effects questionable