10.05.2026

Zoning Plans: Concept, Benefits, and Examples

Building design

Cityscape featuring historic and modern buildings in an urban setting. Photo: londonschoolofeconomics / Unsplash

The zoning plan is the most powerful planning tool under German building law: It specifies, on a parcel-by-parcel basis, what may be built where, how tall, how densely, in what form, and for what purpose. Anyone who understands the logic of the zoning plan understands how cities and municipalities organize space, ensure quality, and steer development. No other instrument of planning law has such a direct impact on the built environment or shapes the character of streets, neighborhoods, and open spaces so directly.

What a zoning plan is, how it is classified legally, and how it differs from a land-use plan
What provisions a zoning plan may contain and what legal bases apply
How the preparation process works and what public participation steps are required
What types of development plans exist and when each type is used
The role the development plan plays in open spaces, green infrastructure, and climate adaptation
What development plans look like in practice and what typical errors arise in their application
What the limitations of this tool are and where other planning instruments are more appropriately used
How the zoning plan fits into the broader context of urban development and open space planning

What is a zoning plan? Definition, legal basis, and classification

A zoning plan is a binding urban development plan as defined by the German Building Code (BauGB). It is adopted by the municipality as a local ordinance and thus has direct legal effect on everyone. This fundamentally distinguishes it from the land-use plan, which, as a preparatory urban land-use plan, is binding only on public authorities and does not establish any direct rights or obligations for property owners. The zoning plan, on the other hand, serves as the basis for issuing building permits; it determines what is and is not permitted on a specific parcel of land.

The legal basis for the development plan is found in Sections 8 through 10 of the BauGB as well as in the Building Land Use Ordinance (BauNVO), which, as a federal statutory ordinance, specifies the possible contents of the plan. The BauNVO defines the types of development areas—ranging from small-scale settlements to general residential areas and industrial zones—and specifies which land uses are generally permitted, permitted in exceptional cases, or prohibited in each type of area. Without the interplay between the BauGB and the BauNVO, a development plan can neither be drawn up nor interpreted.

The zoning plan is generally derived from the land-use plan, which outlines the overall development of the city or municipality in broad terms. This development requirement is enshrined in the BauGB and is intended to ensure that plot-specific planning aligns with the municipality’s overarching development goals. In practice, the relationship between the two planning levels is not always without tension: If a zoning plan deviates from the provisions of the land-use plan, the land-use plan must generally be amended simultaneously or subsequently—a process known as a parallel procedure.

Provisions in the Detailed Development Plan: What Can Be Regulated and How

The scope for provisions in a detailed development plan is extensive but not unlimited. The Building Code (BauGB) and the Federal Building Regulations (BauNVO) constitute an exhaustive list of permissible provisions; a municipality may not regulate matters not provided for therein through a detailed development plan. Key provisions include the type of building use—that is, which area type is designated according to the BauNVO—and the extent of building use, which is described by the floor area ratio (GRZ), the floor space index (GFZ), building mass ratio (BMZ), and the number of full stories.

The GRZ specifies the proportion of the lot area that may be covered by structures. A GRZ of 0.4 means that a maximum of forty percent of the lot may be built upon. The BauNVO sets upper limits for various area types that may not be exceeded by the zoning plan. For ancillary facilities such as garages, parking spaces, and driveways, the BauNVO allows the GRZ to be exceeded by up to fifty percent, but not exceeding a total GRZ of 0.8. This regulation is of considerable importance for open space planning because it determines the minimum amount of unsealed area that must remain on a property.

In addition to land use type and intensity, zoning plans can define the buildable areas of a lot through building boundaries and building lines. The building line requires construction to be carried out along this line; the building boundary must not be crossed, but allows for leeway inward. Building envelope designations in the form of building windows are the most common means of controlling the spatial arrangement of buildings on the property. Other possible provisions concern traffic areas, green spaces, areas for agriculture and forestry, areas for public use, easements for utility lines, planting requirements, preservation requirements for trees and shrubs, as well as measures for the protection, maintenance, and development of soil, nature, and the landscape.

Of particular relevance to landscape architects and open-space planners are the provisions under Section 9(1)(25) of the BauGB, which allow for the planting of trees, shrubs, and other vegetation, as well as the preservation of existing trees, shrubs, and other vegetation. Through this provision, zoning plans can specify concrete greening requirements, such as the obligation to install green roofs, create infiltration basins, or preserve certain woody plant structures. Thus, the zoning plan serves as a direct instrument of green infrastructure at the neighborhood level.

The Drafting Process: Procedure, Public Participation, and Legal Certainty

The procedure for drafting a zoning plan is regulated in detail by the BauGB and follows a multi-stage process designed to ensure transparency, public participation, and legal certainty. It begins with a resolution to initiate the plan by the competent municipal body—typically the city council or municipal council—which must be publicly announced. This resolution defines the plan area and documents the municipality’s planning intent.

This is followed by early public participation in accordance with Section 3(1) of the BauGB, during which the planning intentions are presented to the public and suggestions are solicited from residents. At the same time, early participation by government agencies and other entities representing public interests takes place. These entities—which include nature conservation authorities, road construction authorities, utility companies, and many others—are informed of the planning intentions and invited to submit comments. The comments received must be taken into account in the subsequent planning process.

After a draft plan has been prepared, the formal public participation process under Section 3(2) of the BauGB follows, during which the draft is made available for public review for at least one month. Anyone may file objections. The authorities are also consulted again. All comments received must be taken into account in a balancing process; the municipality must weigh each public and private interest against every other. This balancing process is the most legally sensitive part of the procedure: errors in this balancing process can render the zoning plan invalid.

The process is concluded with the adoption of the zoning plan by municipal resolution and its public announcement, at which point the zoning plan enters into force. For simpler planning projects, the BauGB provides for simplified and expedited procedures, such as the simplified procedure under Section 13 of the BauGB or the expedited procedure for development plans for infill development under Section 13a of the BauGB. The latter allows for the waiver of an environmental assessment under certain conditions and is a frequently used tool for infill development in existing residential areas.

Types of Development Plans: Qualified, Simple, Project-Specific

The BauGB distinguishes between various types of development plans, which differ in their scope of regulation and legal effect. A qualified development plan under Section 30(1) of the BauGB must include, at a minimum, provisions regarding the type and extent of building use, the areas of land available for development, and local traffic areas. A zoning plan is considered qualified only if all four minimum components are present; within its area of applicability, the permissibility of projects is determined exclusively by its provisions.

A simple zoning plan under Section 30(3) of the BauGB does not contain all four minimum components. Within its area of application, Section 34 of the BauGB applies supplementarily, governing the permissibility of projects in unplanned inner-city areas. Simple zoning plans are frequently used when only certain aspects of development need to be regulated—such as the permitted land use or the height of buildings—without establishing the entire regulatory framework of a qualified plan.

The project-specific development plan under Section 12 of the BauGB is a special type tailored to a specific project by a private investor. The project developer enters into an implementation agreement with the municipality, in which the developer commits to carrying out the project and covering the planning costs. This type of plan enables close integration of public planning and private investment, but it also carries risks: If the project is not carried out, a development plan remains in effect that is tailored to a project that is no longer current.

Zoning Plan and Open Space: Green Spaces, Greening, and Climate Adaptation

For landscape architecture and open space planning, the zoning plan is not only a regulatory instrument for buildings but also a central tool for securing and designing open spaces within urban areas. Public green spaces, playgrounds, sports facilities, and cemeteries can be designated as areas with a specific purpose in the zoning plan, thereby gaining a legally protected status that makes it difficult to rezone them. Without this designation, the long-term preservation of open spaces in growing cities would be virtually impossible.

The ability to establish planting and preservation requirements for trees and shrubs makes the zoning plan an instrument for tree protection at the neighborhood level. If a zoning plan mandates the preservation of a specific tree population, that population is protected from being cut down as part of construction projects, regardless of any municipal tree protection ordinance. Conversely, planting requirements can ensure that new development areas are equipped from the outset with a minimum level of greenery that improves the urban climate, biodiversity, and quality of life.

In the context of climate adaptation, the zoning plan is gaining significant importance as a policy instrument. Provisions regarding green roofs, green facades, limiting soil sealing, and the creation of infiltration areas can be directly incorporated into the zoning plan. This allows for legally binding measures at the neighborhood level to reduce the urban heat island effect, manage stormwater, and promote biodiversity. Cities such as Munich, Stuttgart, and Hamburg have gained extensive experience over the past decades in how zoning plans can be used as tools for climate-just urban development.

The regulations governing interventions under the Federal Nature Conservation Act (BNatSchG) are closely linked to the zoning plan. If a zoning plan permits interventions in nature and the landscape, the municipality must ensure, as part of the balancing process, that these interventions are avoided, minimized, or offset. Compensatory measures may be specified within the plan’s area of application or elsewhere; they must be documented in the environmental report. For landscape architects involved in zoning plan procedures, the professional handling of this impact-compensation assessment is one of their central tasks.

Common Mistakes and Misconceptions in Dealing with Zoning Plans

A common misconception is to view the zoning plan as a static document that is established once and then never changed. In practice, zoning plans must be regularly adapted to changing requirements. The German Building Code (BauGB) provides for amendment and supplementation procedures for this purpose, which can be carried out either through a simplified process or the full procedure, depending on the scope of the change. Outdated zoning plans dating back to the 1960s or 1970s—which are based on the land-use structures and guiding principles of that era—can significantly hinder urban development if they are not updated.

Another common mistake is over-specification: If a zoning plan contains too many and overly detailed provisions, it restricts the flexibility of development and makes it difficult to respond to changing requirements. Particularly with project-specific zoning plans, there is a risk that a plan will be so narrowly tailored to a specific project that it becomes unusable for other projects if the original project is not carried out. Good land-use planning strikes a balance between adequate guidance and sufficient openness to different forms of implementation.

On the other hand, too few stipulations lead to legal uncertainty and can result in an inability to prevent undesirable developments. If a zoning plan specifies the type of use but contains no regulations regarding density, height, or design, investors can exploit loopholes that the municipality finds undesirable. Subsequent corrections are costly and not always legally possible once building rights have already been established.

A specific problem in open space planning is the insufficient consideration of green spaces and greening requirements in early planning phases. When green structures are added only retrospectively to a development plan that has already been finalized, this often results in residual areas lacking functional coherence that are unsatisfactory from both an ecological and a design perspective. Expertise in open space planning should therefore be incorporated into the planning process from the very beginning, not just when the green space provisions are being drafted.

The Zoning Plan in the Context of Urban Development: Limitations and Alternatives

As powerful as the zoning plan is as a tool, it has clear limitations. It can exclude certain land uses and mandate specific measures, but it cannot compel investment. A zoning plan that specifies a particular land use does not guarantee that this use will actually be implemented. If the economic conditions or demand are lacking, the plan remains on paper. Especially in structurally weak regions or in cases of complex ownership structures, a zoning plan can remain ineffective for decades.

Other planning tools are better suited for certain tasks. Urban development concepts, informal framework plans, and master plans can respond more flexibly to changing requirements and offer more scope for participation and discussion. They are not legally binding but can serve as a basis for subsequent zoning plan procedures and guide the development of an area over a longer period of time. In practice, urban planning and landscape architecture often employ a mix of tools that combines formal and informal planning instruments.

Urban development contracts under Section 11 of the German Building Code (BauGB) supplement the zoning plan with private-law agreements between the municipality and the project developer. They may contain provisions regarding follow-up costs, the provision of infrastructure, the social housing quota, or the implementation of green space measures that cannot or should not be specified in the zoning plan itself. The combination of a zoning plan and an urban development contract is a proven model for aligning public planning objectives with private investment interests.

The Tool in the Big Picture: Planning Responsibility and Technical Depth

The zoning plan is not a bureaucratic form, but an expression of planning responsibility. It determines how a part of a city or municipality will look and function for decades to come. The quality of a zoning plan depends not only on the correctness of its legal drafting but also on the depth of the urban and open-space planning analysis on which it is based. Anyone who draws up a zoning plan without understanding the open space structure, climatic conditions, ecological interrelationships, and social land-use requirements of an area produces, at best, legally sound mediocrity.

For landscape architects, the zoning plan is a field of work with considerable design potential. The options for designating green spaces, plantings, infiltration, green roofs, and ecological compensation measures are extensive and are not yet fully utilized in practice everywhere. Those who are familiar with these options and incorporate them into planning processes can help ensure that zoning plans not only establish building regulations but also safeguard urban quality.

The challenges of climate adaptation, the biodiversity crisis, and the housing shortage require urban land-use planning to adopt a new level of consideration. In the future, the zoning plan must be understood even more strongly than before as an instrument of integrated urban development that simultaneously takes into account building density, the quality of open spaces, climate resilience, and social accessibility. This requires that the experts who draft and oversee development plans understand the interplay between these dimensions and are able to translate them into legally binding provisions. This is the true expertise that transforms the development plan from an administrative act into a tool for good urban planning.

06.09.2025

Industry news

De Wit: Vapors that defy time

Building design

The De Wit tapestry manufactory in Mechelen, Belgium, is world-famous. Here, antique tapestries from all over the world are cleaned and restored with the utmost care. © De Wit

Light, dust and insects are their enemies: antique tapestries are restored at the Royal Tapestry Manufactory De Wit in Mechelen thanks to a self-developed and patented cleaning system. […]

Light, dust and insects are their enemies: antique tapestries are restored at the Royal Tapestry Manufactory De Wit in Mechelen thanks to a self-developed and patented cleaning system.

Even in the early Middle Ages, they were mostly used to decorate ecclesiastical buildings. The motifs of the tapestries made in monasteries were religious, but changed in a courtly context when the tapestries were also made for the aristocratic class. During state visits and ceremonial celebrations, the ornate tapestries were hung in interior rooms and on exterior façades. They were also used as room dividers to improve acoustics and insulate castle walls from the cold and draughts. As commissioned works, they were based on the dimensions of the respective rooms; large-format tapestries could even decorate entire sequences of rooms. For a long time, they were reserved for the rich and powerful, as they could take several years to produce. After all, tapestries were easy to transport when rolled up and could be hung anywhere for display purposes.

A contract between the client and the tapestry dealer, which set out the conditions for the workshop, contained information about the function, material and size of the tapestry. The client chose the painter and determined the motifs with him. If silk, gold or silver threads were to be used, this increased the price. First, a small sketch was made on paper. This was then enlarged into a drawing. The workshops then translated the design into a textile image. In the late Middle Ages, the cities of Constance, Basel and Strasbourg were among the most important centers of warp knitting. From Brussels to Tournai, the southern Netherlands, which controlled the wool trade due to its proximity to England, then became the main production area. Incidentally, only tapestries from the Manufacture des Gobelins in Paris are considered “tapestries”.

Today, Mechelen to the north of Brussels preserves the tradition of Flemish tapestry art. The Royal Tapestry Manufactory De Wit is located in the brick building of Tongerlo Abbey dating from 1484. It has been run by the fifth generation of the De Wit family since 1889. The founder, Theophiel De Wit, learned the tricks of the trade as an apprentice at the French company Braquenié in Mechelen. He achieved his first successes by adapting to local taste, which demanded only reproductions or variations of the most famous tapestries of the past. Within a few years of handing over responsibility to his son Gaspard, the number of looms and employees had tripled. Contemporary artists were commissioned with the motifs and, with state support, the company survived the economic crisis of 1929. In the early 1980s, the concept was finally changed due to a lack of demand and the focus shifted to trading, collecting and, above all, the techniques of conserving and restoring historical pieces. At this time, the company also acquired the Tongerlo Abbey in the old town to set up the workshops there.

Thanks to its unique infrastructure, which concentrates all aspects of the treatment of antique tapestries within the same laboratory, the manufactory is now a world leader in the preservation of ageing wool and silk tapestries. It also plays a pioneering role in the development of new techniques. Damage is usually caused by the effects of insects, dust, water and light. Nails and screws also leave their mark. Added to this are improper previous repairs and incorrect storage, for example when the fabrics have been folded instead of rolled.

In the past, it was common practice to wash tapestries in temporary baths made of polyethylene and plastic pipes. Cleaning required large quantities of softened and deionized water as well as sufficient drainage. The tapestry was completely immersed in the bath. Mechanical action in the form of a sponge was also essential. To ensure that the entire surface of the tapestry received the same treatment, it was rolled on a roller in the bath. The repeated rolling and unrolling exposed the fabric to considerable stress. The mechanical action could damage delicate threads. The process was lengthy and drying could take between 12 and 24 hours, allowing potentially volatile dyes to spread.

Pierre Maes, the son of Yvan Maes De Wit, leads a team of 15 restorers and art historians as they move through rooms full of colorful balls of wool. Women in white coats bend over long restoration chairs on which centuries-old tapestries are stretched. They have a handful of spools of fine wool and silk in countless shades: ochre, bronze green, blue and crimson. They were selected to match the colors of the damaged weaving. “Our work consists of stabilizing the fabric with a linen cloth placed on the back, which is sewn with these silk threads. In the case of larger gaps, we try not to rework the tapestry identically, but to integrate these gaps into the composition through minimalist interventions,” says Pierre Maes. “When we restore tapestries, we don’t simply weave gold or silver underneath just to make it look better or appear more valuable. Each piece gives us the broad outline of its composition – and we follow it.”

The manufactory sometimes dyes the silk and cotton threads used itself in its laboratory with hundreds of synthetic pigments in order to preserve the colors of the tapestries and guarantee their quality. Before they can take these steps, however, the pieces must first be cleaned. The aerosol suction cleaning method used here was patented over 30 years ago. The suction method has since established itself throughout the museum world as the benchmark method for cleaning antique fabrics. Washing is a risky step: over the years, the cotton has often frayed and the silk has often been pulverized by the effects of time and light. The scientific approach, in which every step is carefully recorded and documented, has set standards.

The system uses a combination of aerosol spray and vacuum suction. It is equipped with integrated sensors to control the pH value, temperature, water flow and pressure. The system consists of a closed chamber with glass panels. The base is a large 5 x 9 meter suction table. There are 45 aerosol sprays attached to the ceiling, approximately 1.75 meters above the platform. During the cleaning process, the tapestry is held in place by continuous suction. When the aerosol is switched on, the chamber fills with water vapor, which is drawn evenly through the entire tapestry. A low concentration of a non-ionic detergent is introduced into the aerosol system for as long as it is deemed necessary for soil removal. This is replaced by softened and then deionized water during the rinsing process.

The subsequent drying process takes place at 30 degrees. Unstable colors flow into the collecting basin. This procedure, including drying, takes around eight hours and is controlled by a series of computers and chemical tests. Famous pieces such as the “Lady with the Unicorn” from the Musée de Cluny in Paris, “Los Honores and Los Paños de Oro” from the Patrimonio Nacional in Spain or the “Le Dais” tapestry by Charles VII from the Louvre have already undergone the process. Regular customers also include private collectors and important collections, such as Spain’s Patrimonio Nacional, the Kunsthistorisches Museum in Vienna, France’s Mobilier national and the Louvre, the Bavarian National Museum in Munich and the UK’s National Trust. “We are in the fortunate position of being able to carry out the most important and most beautiful restoration commissions that are awarded internationally,” says Pierre Maes. And in his hands and those of his highly focused team, they receive the care that these treasures, which are highly prized at art fairs such as TEFAF in Maastricht or BRAFA in Brussels, deserve.

19.12.2024

Artful interlocking

Building design

Living

“Building on” was the motto for the extension of a semi-detached house in Aachen. With a keen sense for the existing, the Amunt architectural office has created an extension that artfully combines the old with the new.

The small house, which is located in a workers’ housing estate on the northern outskirts of Aachen, was purchased by a family of three in 2010. As the floor space of 70 square meters proved to be too small, it was clear from the outset that an extension was needed. The solution was a two-storey extension that cleverly picks up on the cubature of the existing building and at the same time generates an open, independent structure.

The architectural theme of interlocking is a common thread running through the building. Both the shaping of the volume and the spatial organization follow this principle. While the extension on the first floor is clearly recognizable as a new part of the building thanks to the exposed concrete skeleton, on the upper floor it takes up the roof shape of the existing building and creates a polygonal roof sculpture that links old and new.

The floor plan works in the same way. The additional living and dining room is designed as an open “garden room”. The extensive glazing provides a view of the garden, while the brick façade of the existing building becomes an interior wall. The floor above accommodates four bedrooms, two of which are in the extension. Due to the spatial overlap at the intersection of the roof surfaces, the interior bathroom can be naturally lit via a light well. At the same time, its ceiling serves as a sleeping gallery for the adjoining children’s room. The staircase, which forms a transition zone, is of particular importance. An air space has been added to it, making the wooden beam ceiling of the extension visible on the upper floor, as well as the brick wall of the existing building.

The theme of interlocking is most evident in the façade. The unrendered pumice lightweight concrete brick of the extension merges with the clinker brick of the existing building at the verge. Both parts of the building merge into a single unit, but at the same time can be distinguished from each other by the resulting “seam”.

The architects wanted to take away the “hard newness” of the building and incorporate the character of the estate into their design. Thanks to precise interventions, they succeeded. They have created a homogeneous structure whose history remains legible.

Photos: Filip Dujardin