Algemeen Bouwreglement (ABR) 2024 – Building Regulations for the City of Ghent
The Algemeen Bouwreglement (ABR) is the official municipal building ordinance issued by the City of Ghent (Stad Gent), Belgium. This coordinated 2024 edition was adopted by the city council on March 25, 2024, and published in the Belgian Official Gazette on May 27, 2024. It serves as the primary regulatory framework for urban planning and building compliance within the municipality's territory. These regulations apply in full to all environmental permit applications (omgevingsvergunningsaanvragen) submitted from August 1, 2024, onwards.
The document is structured into five thematic parts governing distinct regulatory domains: permit-required works (Part 1), interaction with the public domain and adjacent buildings (Part 2), climate measures and environmental impact mitigation (Part 3), residential and student housing standards (Part 4), and parking requirements (Part 5). It defines critical urban parameters such as the te beschermen eengezinswoning (protected single-family house), net floor area (NVO), and specific thresholds for felling trees, installing green roofs, and managing wastewater separation. These rules ensure that all construction and renovation projects align with Ghent's standards for liveability, sustainability, and urban spatial quality.
The following sections detail the specific technical requirements and procedural rules established by this ordinance for developers, architects, and property owners operating within the Ghent territory.
Permit Requirements and Tree Preservation
The ordinance mandates an environmental permit for specific activities that might otherwise be exempt under regional Flemish law, including certain tree removals and changes in building use.
- Tree Felling: A permit is required to fell any tree with a trunk circumference of at least 50 centimeters at 1 meter above ground level, or 75 centimeters at ground level, provided it is not located in a forest.
- Hospitality Use: Any change of use, whether primary or secondary, to hospitality (horeca) requires a permit to mitigate noise and odor nuisance. Temporary use for pop-ups is limited to four periods of thirty consecutive days per year.
- Environmental Nuisance: New hospitality units must include a dedicated waste storage room of at least 4 m² and specific ventilation exhaust heights (1 meter above the roof ridge).
Public Domain and Infrastructure Integration
Developments must minimize their impact on the public domain and ensure functional integration with street-level activity.
- Protrusions: Balconies and architectural elements may only protrude beyond the building line under strict height-based limits: 10cm below 2.20m height, 20cm (structural) or 60cm (non-structural) above 3m height.
- Street Contact: The ground floor of buildings in closed rows must feature a window opening to facilitate social interaction and safety (levendige plint). Garages at the street front are prohibited if the building width is less than 7 meters.
- Driveways: Only one driveway is permitted per property outside the port area. The maximum width at the building line varies from 3m to 4.5m depending on the width of the adjacent roadway.
- Waste Collection: Large residential projects (50+ units) must provide an underground sorting point (sorteerpunt) on the public domain or private property.
Climate Measures and Water Management
To combat urban heat and water flooding, the ABR enforces strict standards for paving and rainwater management.
- Green Roofs: All new, rebuilt, or expanded flat roofs with an area greater than 6 m² and a slope up to 15 degrees must be constructed as green roofs. They must provide a buffer volume of at least 35 liters per m².
- Water Separation: Separate drainage systems for wastewater and rainwater are mandatory. Direct discharge via waterspouts onto the sidewalk is prohibited to prevent ice hazards.
- Paving Limits: Hard surfaces must be kept to a minimum and should prioritize water-permeable materials where possible.
Residential and Student Housing Standards
Part 4 protects the existing housing stock and sets minimum quality standards for different types of dwellings.
- Protected Single-Family Houses: Houses with a net floor area (NVO) of 220 m² or less are protected against conversion into multi-family units to ensure a supply of family housing.
- Dwelling Mix: Multi-family buildings must provide a mix of unit sizes: at least 25% large (3+ bedrooms), no more than 25% small (studios/1-bedroom), and an overall average NVO of at least 75 m².
- Student Housing: Large-scale collective student accommodation must contain at least 50 units for new builds or 30 units for renovations. At least 20% of units must be rooms without private facilities to ensure affordability.
- Room Dimensions: Minimum NVO for a student room is 12 m², a studio is 21 m² (or 30 m² in permanent residential buildings), and the first bedroom in an apartment must be at least 11 m².
Parking Norms
The city regulates parking to stimulate bicycle use and manage the volume of vehicles within the city center.
- Bicycle Parking: Mandatory for single-family projects of 5+ houses and all multi-family or student projects. Residents' standards: 2 spaces for the first bedroom, 1 per additional bedroom. Visitor spaces: 0.2 per unit (mandatory for 5+ spaces).
- Public Car Parking: The creation of new public car parking spaces is prohibited within the R40 / N430 ring road unless an equivalent number of public on-street spaces are removed by the city.
- Bicycle Storage Design: Standard spaces require 2.2 m² each; high-low systems can reduce this to 1.6 m².
Frequently Asked Questions
When is a green roof mandatory in Ghent?
A green roof is mandatory for new, rebuilt, or expanded flat roofs with a surface area greater than 6 m² and a slope of 15 degrees or less. It must have a minimum buffer capacity of 35 liters per m².
What is the minimum size for a student room in Ghent?
A student room in large-scale collective accommodation must have a minimum net floor area of 12 m². If a kitchen or bathroom is added within the room, the minimum area increases by 3 m² per facility.
Are garages allowed on the street front of narrow houses?
No, if a building is part of a closed row and the parcel width at the building line is less than 7 meters, garages or drive-throughs are prohibited to maintain street-level vitality.
What counts as a 'protected single-family house' in Ghent?
A 'te beschermen eengezinswoning' is a house with a net floor area of 220 m² or less. These cannot be converted into multi-family units or used entirely for hospitality or retail.
How many bicycle parking spaces are required for an apartment?
The standard is 2 spaces for the first bedroom and 1 space for each additional bedroom. Additionally, 0.2 visitor spaces per unit must be provided if the total exceeds five spaces.
Do I need a permit to cut down a tree in my Ghent garden?
Yes, if the tree is not in a forest and has a circumference of at least 50 cm at a height of 1 meter or 75 cm at ground level, an environmental permit for urban planning acts is required.
What is the minimum ceiling height for new rooms?
For new construction, the free height between floor and ceiling must be at least 2.5 meters for living rooms, kitchens, bedrooms, and student rooms.
Are septic tanks required for all new buildings in Ghent?
Yes, a septic tank for fecal wastewater is mandatory for new builds and major renovations where the drainage system is modified, unless technical impossibility is proven and a deviation is granted.
