Not every situation requires the full formal framework of a market value appraisal pursuant to § 194 BauGB (German Building Code). The expert opinion is a methodically equally sound but more compact assessment by a valuer — for purposes where the full formality of a comprehensive appraisal report is not required or not economically sensible.

Despite the shorter format, the methodological basis is identical: personal inspection (where required), market data analysis and professionally substantiated value assessment. The difference lies not in the quality, but in the scope of documentation.

Where the task is to review a valuation prepared by someone else, the appropriate framework is the Second opinion.

Where full evidence for third parties is required, by contrast, the route is via the market value report.