Editorial update: · Richter Immobilien-Transaktionen
A missing permit, a converted attic or a garage now used as a bedroom can complicate a house sale. The first task is to establish whether paperwork has been lost or an alteration lacks the approval it needs. This guide explains how to investigate the position and prepare a sale in Germany, with particular reference to North Rhine-Westphalia.
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Establish exactly what is missing
The phrase “a house without a building permit” can describe several very different situations. The owner may have lost the private copy of an existing approval. The original house may be properly documented while records for a later extension are missing. Alternatively, work requiring approval may actually have been carried out without it.
There is another possibility: the particular work may lawfully fall outside an individual approval procedure. In North Rhine-Westphalia, the state building code distinguishes works exempt from procedure, known as verfahrensfrei, and a conditional exemption process called Genehmigungsfreistellung. These are German legal categories, not equivalents of rules in an English-speaking country. Section 60 of the current NRW building code also makes clear that exemption from approval does not remove applicable public-law requirements.
Begin with a precise description of the affected part: the whole house, an extension, a conservatory, an attic or a converted garage. List the documents you have and the source of each statement about the work. Something you commissioned yourself has a different evidential basis from a previous owner's recollection.
A sale is generally possible despite an unresolved approval position. However, a purchase contract does not make an unlawful use lawful. The useful starting question is what you can demonstrate about the property and what a buyer can safely include in their plans. That determines which investigation is needed before you decide how to market the house.
Search the building file systematically
Contact the building authority responsible for the property's location and identify its archive service. In Düsseldorf, owners or their authorised representatives can request access or extracts, with proof of ownership and identification listed among the required documents. The city's building archive service page explains access and charges. Other municipalities have their own arrangements. Request records early.
Give the current address and, where known, earlier street numbers, plot details, approximate construction dates and application references. Ask about both the original building and subsequent alterations. A drawing alone may come from an abandoned application. You need to understand its relationship to the decision, approved plans, later amendments, conditions and description of the authorised use.
Your own purchase papers, a former owner or the architect involved at the time may provide additional leads. Building invoices can help date work but do not establish that permission was obtained. Likewise, a land register entry, cadastral plan, tax assessment or energy certificate serves a different purpose. The appearance of a structure in one of those records is not general confirmation of its lawful use.
If nothing is found, document which records were searched and ask whether another archive may hold older material. “No file located” is not the same finding as “a required approval was never granted”. A professional can assess the value of alternative evidence. Newly measured drawings may be helpful, provided they are clearly identified as records of the present building rather than approved plans. Producing a new drawing does not itself authorise the rooms it shows.
Compare the documents with the building that exists
Finding an approval is an important step, but it only answers questions within its actual scope. Compare the approved drawings with the current building: external dimensions, extensions, storeys, room uses and the number of separate dwellings. Approval for a single-family house does not by itself confirm a later conversion into two flats. The same issue arises where a room marked as storage now functions as permanent living accommodation.
An architect or suitably qualified building engineer can carry out this comparison. Measuring floor space alone is a narrower task. Structural alterations or escape routes may require additional specialists. Agree the scope and fee so that everyone understands what the resulting assessment will cover.
Consider a house in Düsseldorf with 120 square metres of documented, calculated living space. An attic with a stated area of 25 square metres has also been fitted out as a bedroom, but the available approved plan labels it as storage. This is a specific question to investigate. It is too early either to advertise 145 square metres of established living space or to conclude that the conversion can never be regularised.
The assessment needs to address both lawful use and an appropriate area calculation. Depending on the facts, relevant issues may include ceiling height, daylight, escape routes and structural changes. Heating and attractive finishes do not settle those questions. Record any inaccessible areas and missing information in the assessment. Do not present a limited inspection as confirmation of complete compliance.
Assess possible approval and protection for existing buildings
Older properties require an understanding of their history. Establish when the relevant part was built, what use was authorised and what changed afterwards. The German concept of Bestandsschutz concerns protection for an existing lawful position; it is not an automatic reward for a building's age. Long occupation without an objection does not, by itself, prove that every later alteration is authorised.
Where required approval was not obtained, subsequent approval may be a possible route. It is not guaranteed merely because the structure already exists. Matters to examine can include the local development plan, the site's planning context, separation distances, access, fire protection and other applicable requirements. Ask the designer to identify what additional evidence, physical changes or permissions may be needed. A neighbour's agreement is not a substitute for that assessment.
Keep the stages of progress distinct. A professional may consider a solution plausible; an application may have been submitted; or an approval or other reliable legal basis may actually have been established. Informal advice should not be described as a binding approval. Statutory decision periods also do not provide a universal completion date for archive research, design work, document preparation and any necessary alterations together.
Section 82 of the NRW building code allows prohibitions of use and removal orders where its conditions are met. That does not mean every missing document leads to demolition. If an authority has already written to you, or there are concrete safety concerns, arrange prompt professional assessment. Obtain legal advice on any running deadline. Planning a sale is not a reason to leave an official notice unanswered until ownership changes.
Compare three realistic routes to a sale
One route is to clarify the approval position before marketing. For a lost document, obtaining the relevant archive copy and checking it against the building may resolve the issue. Unauthorised alterations can require a more involved process. A clearer position makes the property easier to describe, but investigation, works and delay may have a cost. It does not guarantee that the eventual sale price will increase by more than those expenses.
A second route is a sale with the unresolved issue expressly disclosed. This requires a buyer who understands the investigation and can bear its consequences. Describe the affected area, the available findings and the remaining uncertainty. A broad “sold as seen” statement does not explain a missing authorisation for residential use. Nor does a negotiated discount answer whether the purchaser will be able to occupy the rooms as intended.
A third route may involve a lawful, more limited use or professionally planned removal or reversal of the alteration. In the attic example, the space might only be included with a use that is actually permissible. Simply relabelling a bedroom as storage is not a solution if the underlying position remains unchanged. Required works and evidence must be assessed, including their effect on the rest of the structure. Reversal itself may require regulatory and technical checks.
Compare the options on a consistent basis: expected proceeds, further expenditure, holding costs during the investigation and risks that remain. The right choice follows from the property's demonstrated possibilities and your circumstances.
Explain the price, floor space and financing position
There is no reliable universal percentage discount for missing building approval. An uncertainty affecting a minor outbuilding differs from one affecting an essential bedroom or the entire residential use. A missing copy also differs from a difficult and expensive route to compliance. Your property valuation should reflect these distinctions and identify which characteristics are established and which are only possible future improvements.
For the example with 120 square metres of documented living space and a 25 square metre attic whose status is unresolved, keep the figures separate. Calling the additional area “usable space” is not enough if the overall advertisement still gives a misleading impression. Explain the physical condition, the available documentation and the unresolved use together. If residential use is subsequently confirmed, the stated area still needs an appropriate, traceable calculation.
Avoid deducting the same risk twice. If a valuation already treats the uncertain space conservatively, do not automatically subtract the full estimated alteration cost again. Conversely, a contractor's quotation may omit design fees, application costs or consequential work. For each figure, establish what it includes and which assumptions it depends on. Use a reasoned range when estimates remain uncertain.
A buyer's lender assesses the property and supporting documents according to its own requirements. Gaps may lead to additional questions or a different valuation; they do not justify predicting that all banks will reject the purchase. Give serious buyers the relevant records in time for their assessment. Do not promise a loan decision or finance for later works. The asking price and the financing discussion should both refer to the same actual condition of the house.
Disclose material findings and prepare the contract
Prepare a clear account of the approval position before detailed negotiations. Identify the building part, its documented use, its present use, missing evidence and investigations already completed. Supply relevant authority correspondence and professional assessments in an organised form. Keep a record of the version supplied and when it was provided. A significant problem should not be left for the purchaser to infer from a large, unsorted bundle of drawings.
Known material problems should be raised expressly. The particular disclosure duties and consequences depend on the facts. Under section 444 of the German Civil Code, a seller cannot rely on an exclusion of liability to the extent that a defect was fraudulently concealed or a guarantee of the relevant characteristic was given. A lack of knowledge is not automatically fraud. State what you actually know and avoid replacing uncertainty with unsupported assurances.
Send the factual account to the notary early. German property purchase contracts require notarisation under section 311b of the Civil Code. Matters to address can include the description of the property, responsibility for further applications, agreed costs and what happens if the desired outcome is not achieved. An attorney should advise on particular liability issues. Notarisation is not a technical inspection or confirmation of building approval.
Our guide to hidden defects when selling a house covers the wider documentation of known problems. Here, the key is consistency between the advertisement, viewing discussions and contractual preparation. If a new approval, refusal or assessment arrives during negotiations, update the affected prospective purchasers.
Turn the findings into a manageable next step
Use a practical sequence: obtain the records, compare the existing building and documented use, assess possible solutions, then choose the sale route. Assign each outstanding question to a person and a next action. This makes it clear whether progress depends on an archive response, a site visit or legal advice. These dependencies determine a workable sale timetable.
For an initial sales discussion, useful information includes the location, property type, approximate construction year, the affected alteration and the records available. For example: “Single-family house in Düsseldorf; attic currently used as a bedroom; available plan describes storage; no later approval located.” This provides much more useful information than saying only that the house has no permit.
You can use the sales enquiry to RICHTER Immobilien-Transaktionen to explain the situation and your preferred timing. It provides a starting point for discussing the sale process, valuation needs and missing property information. Questions about building compliance belong with the relevant authorities and qualified specialists, while contractual and liability issues require the notary or legal adviser. A sales enquiry does not provide approval for construction or use.
The house sale checklist helps organise the remaining documents. Keep the building records together as the sale progresses. Section 74(9) of the NRW building code provides for preservation and transfer of the specified building documents to legal successors. At handover, record what is actually supplied. The resulting file supports an informed sale decision.
