Hoornse Hoogte 2021 – Vision on Urban Growth and High-Rise Development
The Hoornse Hoogte is a municipal policy document issued by the Gemeente Hoorn in 2021. It serves as a strategic framework for urban intensification and the development of high-rise buildings within the city. The document sits under the broader legal umbrellas of the Meer Stad Worden strategy and the Woonvisie, and its principles are integrated into the city's Omgevingsvisie (Environmental Vision). It addresses the increasing demand for affordable housing and the need to preserve the historical character of the city while allowing for modern urban growth.
The document defines specific regulatory domains including building heights, density requirements, and environmental impact assessments. It categorizes the city into four distinct zones: the historical center (Binnenstad), mixed urban areas (Gemengd stedelijk), small-scale urban districts (Klein stedelijk), and green residential neighborhoods (Groene woonbuurt). It introduces the Hoogbouw Effect Rapportage (HER), a mandatory assessment for projects exceeding defined height thresholds, ensuring that new developments do not compromise protected sightlines from the Markermeer or the A7 motorway.
Professional stakeholders, including architects and developers, must adhere to the standards set for the Floor Space Index (FSI) and specific spatial quality requirements such as the bomen-norm (tree quota). The following sections detail the geographical strategies and technical conditions for development in Hoorn.
Area Strategies and Height Limits
The vision distinguishes between different urban environments, each with specific rules for building layers and architectural character:
- Binnenstad and Historic Ribbons: Protection of the 16th-century silhouette is paramount. No high-rise is permitted; only developments matching the historical scale are allowed.
- Mixed Urban (Gemengd stedelijk): Located primarily within 1200 meters of stations and along the Provincialeweg. Standard heights range from 4 to 6 layers, with accents allowed up to 8 layers (30 meters).
- Small Urban (Klein stedelijk): Transformation areas like Pelmolenpad allow for 3 to 5 layers, with occasional accents up to 8 layers.
- Green Residential (Groene woonbuurt): Higher density is permitted only near neighborhood shopping centers or main access roads, strictly under the condition of a spacious green setting.
Density and Floor Space Index (FSI)
To manage urban density, the document employs the Floor Space Index (FSI), representing the ratio of total floor area to the plot area. Specific thresholds determine the required permit procedures:
- FSI 1.5: Maximum for small-scale urban environments, provided parking is not visible from the street.
- FSI 2.5: Maximum for mixed urban environments. Any project exceeding an FSI of 1.5 must solve parking through built structures.
- FSI > 2.5: Classified as high-rise, requiring a full Hoogbouw Effect Rapportage (HER) and detailed urban planning justification.
High-Rise Development and Sightlines
Buildings exceeding 8 layers are considered an exception in Hoorn. Such initiatives are only considered if they overlap with designated intensification zones and fall within specific 'blue sightline triangles' where high-rise already exists.
- Red Sightline Areas: In these zones, particularly toward the historical center, building heights are strictly capped at 8 layers to prevent dominance over the monument silhouette.
- Wind Nuisance: For buildings above 30 meters, a wind climate study according to NEN 8100 is mandatory.
- Sunlight Standards: Public spaces must maintain 'sunspots' with at least 3 hours of sunlight per day.
- Slenderness Ratio: Buildings above 12 layers must maintain a slim volume where height is at least 2.5 times the width of a facade section.
Social and Environmental Standards
Development projects must integrate quality-of-life standards into their design, focusing on sustainability and local climate adaptation:
- Bomen-norm: Developers must plant 1.3 trees for every new dwelling unit. If on-site planting is impossible, green facades or rooftops are required.
- Plinths and Facades: Street-level facades must be active, with a maximum width of 30 meters and a minimum of 2 entrance doors and 4 windows per 30-meter section.
- Shadow and Privacy: Projects must comply with the 'light' TNO-norm to ensure neighboring gardens and private outdoor spaces receive adequate sunlight.
Frequently Asked Questions
What is considered a high-rise building in Hoorn?
According to the policy, buildings exceeding 8 layers (typically 30 meters) are classified as high-rise and are subject to stricter regulatory requirements.
What is the Hoogbouw Effect Rapportage (HER)?
The HER is a mandatory report for high-rise projects that assesses technical impacts like wind and shadow, as well as social-spatial impacts like housing needs and neighborhood integration.
Are there specific zones where high-rise is prohibited?
Yes, high-rise is prohibited in the historical city center (Binnenstad) and along the old historic ribbons (linten) to protect the 16th-century silhouette.
What is the tree planting requirement for new builds?
The 'bomen-norm' requires the planting of 1.3 trees per new home. If the plot size is insufficient, alternative greening like green roofs or facades must be implemented.
How is urban density measured in this vision?
Density is measured using the Floor Space Index (FSI). An FSI above 2.5 automatically triggers the high-rise assessment procedure.
What is the station radius for intensification?
The municipality prioritizes intensification within a 1200-meter radius around the train stations to promote public transport usage.
What sunlight standards apply to new developments?
New buildings must comply with the TNO-norm for shadow prevention and ensure public meeting spaces receive at least 3 hours of sun per day.
Who evaluates the High-Rise Effect Report?
The HER is evaluated by an independent high-rise expert team consisting of a chairperson, an architect, and a municipal urban planner.
