Evaluation factor of a property
The valuation factors of a property refer to any objectively measurable or appraised characteristic that demonstrably increases or decreases the market value according to § 194 of the Building Code. Unlike the purchase price, which is determined by supply and demand, valuation factors are the analytical basis of every professional valuation — whether using the comparison value, income value, or asset value method. Anyone buying, selling, mortgaging, or inheriting a property should know the most important factors, as even deviations of 5–10 % in the valuation factor can determine amounts in the five- or six-figure range.
What are valuation factors? Definition and legal framework
Valuation factors are all value-relevant characteristics that are established in the Real Estate Valuation Ordinance (ImmoWertV) as the basis for expert valuation. They are divided into object-related factors (location, building condition, equipment) and market-related factors (land yield rate, standard land value, market adjustment factors). An expert combines these characteristics with the appropriate valuation method.
Which method is applied depends on the property type. As described in the guide Evaluate Property, the Comparison Value Method is most commonly used for owner-occupied houses, the Income Value Method for investment properties, and the Asset Value Method for special properties.
The Most Important Evaluation Factors at a Glance
In practice, there are around a dozen factors that appear in almost every appraisal. They act multiplicatively: a top location can partially compensate for building defects — conversely, a poor micro-location can also reduce the value of a luxuriously equipped apartment.
- Macro and micro location — city, district, street, neighborhood
- Year of construction and remaining useful life — usually 60–80 years for residential buildings
- Building condition — backlog of renovations, roof, façade, heating
- Standard of equipment — basic, average, high, very high
- Living and usable area — calculated according to the residential area regulation
- Land size and layout — standard land value × m²
- Energy efficiency — KfW class, primary energy demand in kWh/m²a
- Construction defects and damage — moisture, cracks, pollutants
Practical example: How a single factor can shift the value by 80,000 €
A concrete calculation example shows the leverage effect of the valuation factors. Two identical row houses, each with 140 m² living area, built in 1995, in the same street — the difference lies solely in the renovation status.
| Evaluation Factor | House A (renovated) | House B (unrenovated) |
|---|---|---|
| Energy Efficiency Class | B (75 kWh/m²a) | F (180 kWh/m²a) |
| Heating | Heat Pump (2022) | Gas Boiler (1998) |
| Bathrooms/Kitchen | Renovated 2021 | Original 1995 |
| Remaining Useful Life | approx. 65 years | approx. 45 years |
| Market Value | 620,000 € | 540,000 € |
The difference of 80,000 € corresponds almost exactly to the necessary renovation budget — the market thus rationally prices in evaluation factors. Whoever buys House B and renovates it themselves can, however, increase the value difference by 15–25 % through self-employment and subsidies.
Location as the Most Important Evaluation Factor
“Location, location, location” is more than a real estate agent’s phrase — it is statistically the most influential single factor and accounts for up to 60 % of the market value in metropolitan areas. It’s not just the city that counts, but especially the micro-location: quiet side street or bypass road, ground floor facing a railway line or penthouse with a skyline view — differences of 1,500 €/m² within the same postal code are normal in Munich, Hamburg, or Frankfurt.
An average apartment in a top location usually outperforms a top apartment in an average location — because furnishings can be modernized, but location cannot.
Evaluation factor vs. purchase price factor — the most common confusion
Beginners often confuse the valuation factor with the
Common mistakes in assessing valuation factors
Owners and buyers systematically overestimate or underestimate individual factors. Three errors occur particularly frequently and lead to incorrect buying or selling decisions.
- Emotional value — Memories do not increase the market value
- Renovation costs — calculated as a 1:1 value increase
- Location blindness — main street is sold as “central”
- Energy certificate ignored — has significantly reduced value since 2024
- Remaining useful life incorrect — Year of construction ≠ remaining years of use
Evaluation factors by property type
Which factors are weighted more heavily depends on the property type. For the first property for personal use, location, floor plan and equipment dominate. For a property as an investment, rent level, tenant structure and maintenance reserves come to the forefront — when evaluating an apartment building, appraisers also consider the property interest rate and the risk of rental default.
FAQ: Frequently asked questions about evaluation factors
The following questions clarify the most important uncertainties that buyers, sellers and owners regularly deal with when dealing with evaluation factors.
Which evaluation factors influence the market value the most?
The greatest influence is usually determined by location and condition of the building, followed by living space, standard of equipment, and energy efficiency. In urban areas, the micro-location can account for 40–60 % of the market value, while in rural areas, the building condition and plot size often have a stronger impact. Since the energy crisis and stricter GEG requirements, the factor of energy efficiency has also gained significant weight — unsanitized houses with efficiency classes F or G are now traded with discounts of 15–25 %.
Can I assess valuation factors myself or do I need an expert?
A rough initial assessment is certainly possible with online tools and comparison portals, as standard land values, comparable prices, and energy certificate data are publicly accessible. However, for legally secure valuations — such as in inheritance, divorce, bank financing, or disputes — a certified expert is essential. A market value expert opinion costs between 1,500–3,500 € depending on the size of the property, but is court-admissible and recognized by the tax office and banks.
How do building defects specifically affect the valuation?
Structural defects are assessed in the appraisal as a reduction in value in euros — usually at the level of the remediation costs plus a risk premium of 10–20 %. Hidden defects such as mold, wood protection issues, or asbestos can disproportionately reduce the market value because they deter potential buyers and prolong the marketing period. In a row house with a market value of 500,000 € and a renovation need of 60,000 €, the real market value is not 440,000 €, but rather around 410,000–420,000 € — the market demands a risk discount.
Back to the Wiki: Real Estate Lexicon
Real estate books for children: Timmy's Abenteuer - Mit Spaß ein bisschen Investment lernen (in German)
How much is an apartment building worth? 5 value factors for apartment buildings
Buy a villa in Berlin: Villas as an Investment - Process, Costs, Off Market & Co.
5 real estate location tips for cafés: Scale like Starbucks
Buying a villa in Hamburg: Luxury real estate as an investment - estate agents, costs, off-market & co.
Buying a villa in Düsseldorf: First-class property - costs, procedure, off-market & Co.
Investment Real Estate: What You Need to Pay Attention to When Buying Your First Property
Berlin | Kreuzberg | Apartment building | 3,700,000 € with approx. 2.7% return
Berlin | Lichterfelde | Apartment building | 4,450,000 € with approx. 1.88% return
Berlin | Reinickendorf | Apartment building | 4,650,000 € with approx. 4.5% return
