That depends on the individual property and purpose. The more unusual and larger the property and the more important the instruction, the more benefit there is in instructing an expert to support you.
The real estate stock typically comprises a high proportion of owner-occupied residential properties.
If you simply want an informal price estimate for your house or apartment out of interest or to test the market, there are plenty of online calculators provided by internet portals and automated calculation engines provided by financing brokers or estate agents at your disposal – in some cases free of charge. We would recommend you consider and clarify issues such as confidentiality and use of data, competence and possible fees prior to use.
The more uniform and comparable the property, the more likely the use of such automatic systems will result in a realistic value estimate. This is easiest to achieve in larger cities with active property markets and developed with owner-occupied apartment and houses. Market data is plentiful and readily available in such locations.
By contrast, personal local expertise is in particularly high demand in the case of individual buildings, leased multi-family residential buildings, office buildings, commercial and manufacturing properties and residential/retail buildings. This also applies to retail properties such as shopping centres, discounters, warehousing and logistics properties, hotels and project developments. These types of buildings are often more heterogeneous, characterised by fewer properties, varying lease contracts, unusual property features and are thus more problematic in appraisal terms. There is often a lack of publicly available information and poor market data.