Mobile Appraiser for Used Cars: Legally Sound Valuation Reports

A key aspect in valuing used cars is the absolute independence of the appraiser. Unlike many online portals or purchasing stations, which value vehicles in order to then buy or broker them themselves, DIAVAG operates as a pure inspection body under ISO/IEC 17020 Type A. This means there is no economic self-interest in the purchase or sale of vehicles, insurance, or repair services. This neutrality is the fundamental prerequisite for the legal usability of an appraisal, whether in private sales, inheritance matters, or legal disputes.

DIAVAG's appraisers are qualified according to the guidelines of the BVSK (German Association of Independent Automotive Appraisers). Each PDF appraisal produced is additionally reviewed and signed by a senior inspector. This multi-step process ensures that the valuation meets the highest quality standards and can withstand third-party scrutiny at any time. For customers, this means a level of certainty that goes far beyond simple algorithm-based estimates. While algorithms merely provide statistical averages based on year of manufacture and mileage, the mobile appraiser captures the individual condition of the specific asset on site.

DIAVAG's mobile service is characterized by a highly efficient, technology-supported workflow. The appraiser carries a special hardware case containing all the instruments needed for a precise diagnosis. The central element is the OBD2 scanner, used to read the vehicle's fault memory and analyze real-time parameters from the control units. This allows the identification of hidden defects that often go undetected during a simple test drive. In parallel, a coating thickness gauge is used to measure paint density at various points on the body. This makes it possible to unambiguously prove repainting and repaired accident damage, even if it has been optically disguised to perfection.

The inspection also includes a check of tire tread depth and comprehensive, standardized photo documentation. These images are taken using a tamper-proof procedure and are a fixed part of the appraisal. Data collection on site usually takes less than 15 minutes. This time savings is a decisive advantage over traditional appraiser appointments at workshops, which often involve long waiting times and travel. Thanks to digital transmission of the data to headquarters, the finished appraisal can often be provided as a PDF on the very day of the inspection. Optionally, the document can be given a notarial hash on the Polygon blockchain, which permanently and tamper-proof documents the integrity of the data.

A common problem when commissioning appraisers is the unclear cost structure, which is often based on hourly fees or the value of the item. DIAVAG breaks with this practice and offers clear fixed prices. The standard valuation report for cars, boats, cargo bikes, or e-scooters costs auf Anfrage. This price includes travel within the regions of Hamburg, Berlin, and Munich, as well as the complete preparation of the BVSK-compliant appraisal. There are no hidden fees for documentation or delivery of the digital report.

For more complex assets such as electric cars or home storage systems, a premium rate of auf Anfrage is charged. This surcharge is justified by the use of specialized diagnostic technology, particularly for the Premium Battery Test. In a market environment where appraisals can often cost several hundred euros, this model offers planning certainty for both private and commercial customers alike. For large customers such as car dealers or fleet operators reaching a volume of more than 50 appraisals per month, individual terms are agreed. These can also be connected via an API interface directly to existing Dealer Management Systems (DMS), which reduces administrative effort to a minimum.

For used electric vehicles, the traction battery is the value-determining component. A conventional appraisal that only assesses the visual condition and tread depth falls short here. DIAVAG therefore integrates the Premium Battery Test into every Premium appraisal for electric cars. This test provides precise data on the state of health (SoH) of the battery, cell balance, and the actual kWh capacity. While many inspection organizations only read basic diagnostic data from the onboard computer, DIAVAG conducts an in-depth analysis of the battery management system parameters.

This data is crucial, since the remaining capacity of the battery directly affects the vehicle's market value. An electric car with an SoH of 95 percent achieves a significantly higher price on the market than an identical model with only 85 percent. The Premium Battery Test gives buyers the assurance that no costly consequential damage from a worn battery is looming. This proof is also a strong argument for sellers in price negotiations. With an eye on the upcoming EU Battery Passport, which becomes mandatory from February 2027, DIAVAG is already technologically positioned today to capture all relevant battery data in a standards-compliant manner.

In legal contexts such as inheritances, divorces, or insurance claims, the quality of the appraisal is decisive for its recognition. DIAVAG produces appraisals that meet the requirements of the JVEG (Judicial Remuneration and Compensation Act) and BVSK standards. Certification as an inspection body under ISO/IEC 17020 Type A documents the highest possible level of independence. This is a significant difference from valuations by workshops or sales platforms, which could often be classified as biased in court.

Lawyers and notaries use the mobile appraisals to precisely determine the value of estates or marital property. Since the appraiser comes to the location of the object, there is no logistical effort involved in transporting vehicles that may not be registered or roadworthy. This applies not only to cars but to all seven asset classes, including boats and construction machinery. In cases of disagreement about the value of a vehicle after an accident, or when returning a leased vehicle, the DIAVAG appraisal provides an objective data basis. However, it is expressly noted that DIAVAG does not provide legal advice. For specific legal questions, a qualified lawyer or notary should always be consulted.

A unique selling point of DIAVAG is its coverage of seven different asset classes. While classic inspection organizations such as TÜV or DEKRA focus almost exclusively on motor vehicles, DIAVAG also appraises boats, construction and agricultural machinery, cargo bikes, e-scooters, and residential solar storage systems. This breadth is particularly valuable for customers who need to have several different assets appraised, for example as part of a business handover or a comprehensive estate settlement.

Each asset class follows a specific inspection protocol. For construction machinery such as excavators or wheel loaders, the focus, in addition to general condition, is on safety-relevant components under the EU Machinery Regulation. For boats, the hull, propulsion, and electrical system are checked. Home storage systems, like electric cars, undergo a detailed battery diagnostic to determine storage capacity and efficiency. This holistic approach makes it possible to obtain a uniform, high-quality appraisal for the most varied mobile and stationary assets from a single source. The fixed price of auf Anfrage or auf Anfrage applies across all classes, which makes calculation extremely simple for the customer.

For car dealerships and fleet managers, DIAVAG offers a scalable solution for inventory valuation and purchase inspection. The use of the mobile appraiser enables dealers to value vehicles directly at the customer's location or at external storage sites, without tying up their own staff. From a volume of 50 appraisals per month, DIAVAG provides an API interface. This allows seamless integration of the appraisal data into existing Dealer Management Systems (DMS). This speeds up processes and significantly increases data quality in inventory management.

In addition, DIAVAG offers independent appraisers or workshops a hardware case including the associated software at a list price of auf Anfrage. This allows partners to apply the standardized DIAVAG workflow independently while still benefiting from central quality assurance and the brand. The combination of mobile on-site inspection and digital evaluation reduces vehicle standing times in dealerships and ensures transparent communication with the end customer. In a market environment increasingly shaped by online transactions, an independent appraisal creates the trust needed for digital vehicle sales.

To understand DIAVAG's positioning, a comparison with other market participants is helpful. The following table illustrates the differences in scope of service and independence:

This comparison shows that DIAVAG closes the gap between pure online estimates and stationary inspection stations. While free purchase portals often use bait offers to acquire vehicles cheaply, DIAVAG provides an objective valuation with no ulterior motives. Compared to the major inspection organizations, DIAVAG scores through its specialization in mobile deployments and the in-depth battery diagnostics that are essential for modern vehicles.

For the on-site appraisal to run smoothly within the 15-minute window, customers should make a few preparations. The vehicle or asset should be presented in a clean condition so that visual defects such as scratches or dents on the body can be documented without doubt. In addition, all relevant documents, such as the vehicle registration certificate parts I and II, the service booklet, and invoices for recent repairs or maintenance, should be kept ready.

For electric cars and home storage systems, it is also advisable to bring the system to a charge level of at least 20 to 80 percent before the appointment, to ensure optimal conditions for the battery test. The appraiser needs free access to the vehicle and to the OBD2 port. Since the appointment is arranged within 24 hours of commissioning, this short preparation time ensures a quick handling of the entire sales process. After the on-site inspection is complete, no further action is required from the customer. The appraisal is generated automatically, goes through quality assurance, and is delivered digitally.