Check the registers of contaminated sites and public-law building obligations before buying

Article L-0129 · 19.10.2026 · 7 min. read · Joé Christian Ewrard

What is the difference between contaminated sites and public-law obligations?

Contaminated sites affect the soil or groundwater. These may include former commercial uses, deposits or the handling of environmentally hazardous substances. What currently stands on the property is not the only relevant factor. Even a use that ended long ago may be relevant.

By contrast, a public-law obligation is a commitment under public law that applies to a property. The owner undertakes vis-à-vis the building control authority to perform, tolerate or refrain from a specific action. A public-law obligation may, for example, relate to access, required parking spaces, setback areas or the joint consideration of several properties under building law.

Both issues can affect a property's use, development potential, financing and marketability. However, they are recorded in different registers. A single enquiry is therefore not sufficient.

It is also important to distinguish these matters from the land register. This primarily records ownership and private-law encumbrances such as rights of way, rights of residence or land charges. A public-law obligation is not normally recorded there in full. A land register extract that raises no concerns is therefore no substitute for information from the register of public-law obligations.

Why should buyers check for contaminated sites before purchasing?

An indication of a contaminated site does not automatically mean that a property is dangerous or unusable. Initially, it may only indicate that further checks are required due to the property's former use or available information. The key questions are then: What is known, how has the matter been assessed, and are further investigations or measures required?

For buyers, this is not only about potential remediation work. Soil contamination can complicate planned excavation work, affect the disposal of excavated material or have implications for the use of a garden. Banks, surveyors or insurers may also require additional documentation if a suspected issue becomes known.

Properties that were formerly used for commercial purposes warrant particular attention. These may include workshops, petrol stations, storage areas or sites with an unknown operating history. Filled areas and former dumping grounds are also reasons to take a closer look. By contrast, the age of a house alone reveals little.

In practice, the absence of an entry is not proof that the soil is uncontaminated either. The soil protection register reflects the information known to the authorities and is updated over time. Not every former use or instance of contamination will necessarily have been recorded yet. Where there are specific indications, historical research or an expert investigation may therefore be advisable.

What can a public-law obligation mean for the buyer?

A public-law obligation can benefit or encumber a property. Guaranteed access across a neighbouring property may, for example, have been a prerequisite for obtaining planning permission for a construction project. Conversely, the property itself may be subject to an obligation to keep this access permanently clear.

The same applies to required setback areas or parking spaces. An area that at first glance appears to be available for future development, use as a garden or an additional parking space may already be designated for another purpose by a public-law building obligation. This does not necessarily speak against the purchase. However, it must be compatible with the intended use and the agreed price.

As a general rule, public-law building obligations remain in force even after a change of ownership. The buyer therefore acquires a property subject to the existing public-law obligation. It cannot be removed simply by the seller and buyer agreeing to its removal in the purchase agreement. The competent building control authority must be involved, and the legal requirements must actually be met.

A common mistake is to ask only about the word “Baulast”. Buyers should also ask to see the underlying declaration of obligation and, where applicable, the site plan. Only these documents reveal which area is affected, who benefits from the arrangement and what it means in practice for alterations, new construction or use.

Where can the relevant information be obtained?

In Rhineland-Palatinate, the register of public-law building obligations is maintained by the competent lower building control authority. Depending on the location of the property, this is generally the district administration or the municipal administration. Anyone who demonstrates a legitimate interest may apply to inspect the register or request written information. The evidence and documents required depend on the competent authority and the individual case.

In Rhineland-Palatinate, the contaminated land register is the relevant source for contaminated sites. It is also referred to as the register of suspected contaminated sites. Information on a specific property is provided by the competent regional office of the Structural and Approval Directorate. In PRIOCASA's area of operation, for example in the Eifelkreis Bitburg-Prüm, Trier, Trier-Saarburg and the Vulkaneifel, it is generally necessary to check whether the SGD Nord has territorial jurisdiction.

If the prospective buyer is not yet the owner, authorisation from the owner is generally required to obtain information from the contaminated land register. The seller should therefore be involved at an early stage. If the seller refuses an objectively justified request without a comprehensible reason, this is not proof of a problem. However, it is a reason to make further enquiries before entering into a binding commitment.

For both enquiries, the property should be clearly identified and the cadastral district, section and parcel number should be provided. A street address alone may be too imprecise for subdivided properties or properties comprising multiple parcels. The details can usually be found in the extract from the land register, cadastral documents or sales documents.

How should the information be interpreted?

The phrase “no entry on record” is easily confused with “no risk exists”. In fact, it initially means that the relevant register does not contain any corresponding information. This provides important reassurance, but is no guarantee of the actual condition of the soil or the complete situation under building law.

Where an entry exists, its precise content is what matters. In the contaminated land register, a distinction must be made between a documented suspicion, available investigations and measures that have already been carried out. A soil protection expert can assess whether the available documents are sufficient for the intended use and which questions remain unresolved.

A public-law building obligation should likewise not be considered in isolation. The decisive factors are its wording, the area to which it applies and its current use. Building permits, site plans, building records and the actual conditions on site may also be required. For example, a legally secured access route is of little benefit if it is unclear whether it can be used in practice.

If inconsistencies arise, the purchase process should not be terminated prematurely. The first step is to clarify whether documents are missing, an old entry is outdated or an official assessment exists. The right response is an orderly review, not immediate panic or downplaying the issue.

When should the checks be carried out?

The best time is before the final purchase decision and before notarisation. At that point, outstanding issues can still be clarified, documents added and the impact on use and financing assessed. After notarisation, the scope for action is generally significantly more limited.

In an orderly sales process, the parcels of land are first clearly identified. The land register, register of public building encumbrances and contaminated land register are then reviewed separately. If any issues are identified, the appropriate specialist documents are obtained. These may include building records, a previous investigation, an official statement or an expert assessment.

Relevant entries should also be submitted to the financing bank well before the notary appointment. If the bank needs to supplement its assessment, the financing decision may change. This helps buyers avoid the difficult situation of the purchase agreement, financing and actual characteristics of the property being inconsistent.

This point is particularly important for prospective buyers from Luxembourg. In the border region, German property and building regulations sometimes intersect with cross-border financing or advisory arrangements. However, responsibility for registers and permits remains with the authority where the property is located. Terms used in Luxembourg cannot simply be applied to a property in Rhineland-Palatinate.

Which additional documents should also be reviewed?

Information from the contaminated land register and the register of public building encumbrances is important, but does not constitute a complete purchase review. Other essential documents include the current land register extract, cadastral map, existing building permits and building records. In the case of extensions or alterations, it should be clarified whether the permits correspond to the property as it actually stands.

Public-law requirements outside the register of public building encumbrances may also be relevant. These include provisions in a development plan, heritage protection, nature and water conservation or special requirements relating to site access and utilities. The appropriate checks depend on the property and the buyer's plans.

For rural properties in the Eifel, attention should also be paid to the previous uses of outbuildings and yard areas. Old tanks, workshop areas, filled-in pits or undocumented deposits cannot be reliably identified from a property listing. Sellers should therefore be asked about the property's history of use, and any visible irregularities should be documented during the viewing.

A notary or lawyer is the appropriate contact for legal consequences, exclusions of warranty and the drafting of the purchase agreement. Tax implications should be referred to a tax adviser. An estate agent can organise documents, structure questions and bring the parties together, but is no substitute for legal, tax or specialist advice.

What happens if the findings raise concerns?

An unusual finding is initially information, not a final decision. Buyers should clarify what use is planned, what restriction actually exists and who can provide a professional answer to the outstanding question. Only then can it be assessed whether proceeding with the purchase still makes sense.

If contaminated land is suspected, a phased investigation may be appropriate. The type and scope are determined by a qualified expert based on the findings available to date. Buyers should not infer a remediation obligation themselves from individual soil values or historical terms.

In the case of a public building encumbrance, it should be checked whether it affects the current or planned use. If an amendment or removal is desired, the competent building control authority should be consulted before the purchase. Merely assuming that the public building encumbrance will eventually be removed is not a reliable basis for a decision.

The findings can be taken into account in the purchase negotiations and the notarised contract. Options include clear disclosures, conditions or provisions relating to investigations that are still outstanding. The legally valid form must be agreed on a case-by-case basis with the notary or a lawyer. The purchase price should only be assessed once the nature and extent of the findings have been sufficiently clarified.

Before making a binding decision to purchase, ask for the parcel details and separately request information from the register of building encumbrances from the competent building control authority and information from the soil protection register. Bring any irregularities to the attention of the bank and the appropriate specialists at an early stage. For properties in the Eifelkreis Bitburg-Prüm, Trier and Trier-Saarburg, the Vulkaneifel and along the border with Luxemburg, PRIOCASA can help compile the documents and prepare the next questions for the notary, authority or experts.

Frequently Asked Questions

Are building encumbrances recorded in the land register?

In Rheinland-Pfalz, building encumbrances are recorded in the register of building encumbrances maintained by the competent building control authority. The land register primarily contains private-law rights and encumbrances. Buyers should therefore check both registers separately.

Who may request information on contaminated sites?

The owner can request information from the soil protection register. Prospective buyers usually require authorisation from the owner. The competent regional office of the Struktur- und Genehmigungsdirektion provides information about the required documents.

Does an entry in the soil protection register mean that the soil is contaminated?

No. An entry may also document a suspected issue, a previous use or a matter that has already been investigated. The decisive factors are the information provided by the authorities and, where applicable, the assessment of a soil protection expert.

Can a building encumbrance be removed after the purchase?

Removal is not automatically possible. The competent building control authority must determine whether there is no longer any public interest in the building encumbrance and whether the requirements for its removal have been met. Reliable information on this should be obtained before the purchase.

Is the information “no entry on record” sufficient?

It is an important part of the assessment, but not a guarantee. Registers reflect the information known to and documented by the authorities. Further investigation may be required if there are indications of unusual previous use, visible signs or conflicting documents.

Topics: contaminated sites, register of building encumbrances, soil protection register, property purchase, Eifel, Trier, property due diligence, building control

Responsible for this article: Joé Christian Ewrard — Owner & IHK-certified estate agent, PRIOCASA Immobilien & Finanzservice. Last updated: 19.10.2026. The draft was created with the support of artificial intelligence and was reviewed and approved before publication (AI Transparency). This post does not replace legal or tax advice; for individual questions, please contact a notary, lawyer, or tax advisor.

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