Market Value Appraisal under DIN EN ISO/IEC 17024: What the Valuer's Certification Really Means

When selecting a real estate valuer, one frequently encounters the designation "certified according to DIN EN ISO/IEC 17024". For clients, it is often unclear what this standard means – and whether a valuer certified under this standard provides a "better" or legally more secure appraisal report than others. This article contextualizes the certification and explains what actually matters for the recognition of the market value appraisal.

What DIN EN ISO/IEC 17024 Regulates

The standard DIN EN ISO/IEC 17024 is titled "Conformity Assessment – General Requirements for Bodies Operating Certification of Persons". It specifies the conditions under which a certification body may assess and confirm the competence of individuals. It is therefore a personnel certification – as opposed to standards concerning products (ISO/IEC 17065) or management systems (ISO 9001).

For real estate valuers, this means: An accredited certification body assesses professional knowledge, practical competence, and the ability to produce standard-compliant appraisal reports within a regulated procedure. The certification is time-limited and must be maintained through monitoring and recertification – typically on a five-year cycle.

The Role of Accreditation (DAkkS)

For a certification to be meaningful, the certifying body itself must be supervised. In Germany, this is the responsibility of the German Accreditation Body (DAkkS). Sie akkreditiert Zertifizierungsstellen nach ISO/IEC 17024 und stellt sicher, dass diese unabhängig, unparteiisch und nach einheitlichen Maßstäben arbeiten. Man spricht deshalb von einer akkreditierten Personenzertifizierung – ein zweistufiges System, das Vertrauen von der Gutachterperson über die Zertifizierungsstelle bis zur staatlich beliehenen Akkreditierungsstelle durchreicht.

Certification, Official Appointment, and Independent Valuers

In addition to the certified valuer, there are two other qualification pathways that are often confused:

• Officially appointed and sworn-in (ö.b.u.v.) valuers are appointed by a chamber (e.g., the Chamber of Commerce and Industry). This is also a state-recognized proof of competence, but it is based on a different, chamber-bound procedure.
• Independent valuers are also permitted to prepare appraisal reports; however, their qualification is not substantiated by a uniform, supervised procedure.

Neither certification nor official appointment is legally required to prepare a market value appraisal – the professional title “valuer” is not protected in Germany. This is precisely why a verifiable, supervised proof of competence is an important selection criterion for clients.

Significance for the Recognition of the Appraisal Report

For courts, tax authorities, and banks, the primary consideration is the substantive quality of the appraisal report: a methodologically sound valuation in accordance with the ImmoWertV, traceable derivations, and a documented inspection. Certification according to ISO/IEC 17024 does not replace this quality, but it supports it:

• The tax office generally accepts appraisal reports from certified or officially appointed valuers as evidence of a lower fair market value (for property tax, inheritance/gift tax purposes).
• Before court the certified qualification enhances the credibility and evidentiary weight of a private appraisal report.
• For the Mortgage lending value determination banks already require appropriate proof of competence from the valuer.

Conclusion

A market value appraisal "according to DIN EN ISO/IEC 17024" correctly means: prepared by a person-certified valuer. The certification demonstrates tested, independently monitored competence and facilitates acceptance by courts, tax offices, and banks – however, the actual evidentiary weight arises from the substantive quality of the valuation. Both factors combined make an appraisal report robust.

The Real Estate Valuer Office STRECKEL prepares market value appraisals in accordance with the requirements of the ImmoWertV, based on certified valuer qualifications. Book a non-binding consultation appointment now.