Delimitation is negative
The outer zone is everything lying neither within a qualified local plan nor within a contiguously built-up locality. The definition is therefore framed negatively.
Typical outer zone land is open farmland, woodland and meadow, open land between settlements, and isolated buildings away from the settlement core. The boundary in the individual case remains contentious nonetheless.
Distinguishing it from built-up areas is therefore the decisive step, and it is frequently contested. The article on development in unplanned built-up areas covers the conditions for contiguity.
Two categories of project
The statute distinguishes privileged and other projects, and the difference is fundamental. It concerns not the requirements but the test applied.
| Category | Definition | Principle |
|---|---|---|
| Privileged projects | uses exhaustively listed in the statute that by their nature belong in the outer zone | permissible in principle |
| Other projects | everything else | in principle prohibited, admitted only in the individual case |
In practice a clear rule follows. An ordinary dwelling is almost never permissible in the outer zone.
The decisive difference lies in two verbs
This is the core of the provision and the point at which the two categories genuinely differ. It concerns whether a weighing takes place at all.
| Category | Condition |
|---|---|
| Privileged project | public interests must not stand against it |
| Other project | public interests must not be impaired |
The difference is substantial.
| Category | Test | Consequence |
|---|---|---|
| Privileged project | public interests and the project are weighed against each other | impairment does not automatically make it impermissible |
| Other project | no weighing | as soon as a public interest is impaired, the project is impermissible |
For the privileged uses the legislator has therefore taken the planning out of the municipality's hands and given them a special position. Those uses need no local plan.
The public interests are not exhaustively listed
The statute gives examples of when public interests are impaired. Named among others are contradiction of a landscape plan or other sectoral plan, uneconomic expenditure on transport, supply or disposal installations, and the creation or consolidation of scattered development.
The list is expressly not exhaustive. Further interests may be added. The catalogue therefore only indicates the direction.
In practice this means that advance clarification in the outer zone may require expert reports, particularly on nature and landscape protection, emissions control and water law. Those reports fall due before the application is made.
No discretion exists here either
A point the wording conceals.
For other projects the statute says they may be permitted in the individual case. That reads like a discretionary provision but is not one.
The reason is constitutional: were the decision discretionary, the content of property rights would be determined by the authority rather than by statute. The provision is therefore construed as a bound decision.
In practice: where an unprivileged project impairs no public interests and servicing is assured, an entitlement to permission exists. The hurdle lies in the first condition, not in any margin of discretion.
What applies in addition
Three requirements sit alongside the permissibility assessment. They apply irrespective of the category of the project.
| Requirement | Content |
|---|---|
| Assured servicing | required in the outer zone too, and providing it can be considerably expensive |
| Land-efficient and sensitive execution | all projects permissible in the outer zone must limit land take and soil sealing |
| Undertakings | for certain projects a declaration must be given, particularly concerning removal after permanent abandonment |
Favoured projects in existing buildings
Alongside privileged projects the statute recognises a third group: favoured projects. Certain public interests cannot be raised against them.
They essentially concern existing buildings: changes of use of formerly agricultural or forestry buildings, extensions and replacement buildings, under narrow conditions. They are of no help for new projects.
For projects involving existing buildings in the outer zone it should therefore always be examined separately whether a favour applies. The conditions are narrowly drawn and assessed case by case.
What follows for practice
Three recommendations for outer zone projects. All three take effect before design begins.
| Recommendation | Why |
|---|---|
| Clarify the classification before acquiring the site | whether land is inner or outer zone determines its value |
| Assess privilege early | it determines which condition applies and therefore the prospects |
| Use the preliminary ruling | it matters more in the outer zone than in built-up areas, because the assessment may need expert reports |
Related articles
This article reflects the position of the rules and case law at the date of checking and serves professional orientation. It does not constitute legal advice and does not replace assessment of the individual case.