Remaining useful life

Remaining useful life - The remaining useful life (RUL) refers to the number of years for which a building is expected to remain economically usable if properly maintained. It is a key parameter in real estate valuation and has a significant impact on both the asset value and the income value of a property.

Calculation and influencing factors

The calculation of the remaining useful life follows a simple basic formula: Total useful life minus the age of the building equals the calculated remaining useful life. The total useful life is the economic lifespan assigned to a building depending on the type of building and construction method. It is specified in tabular form in the Property Value Guidelines (SW-RL), Appendix 4. Typical values range from 60 to 80 years for residential buildings constructed with solid materials. Single-family homes are often estimated at 70 to 80 years, while multi-family homes are estimated at 60 to 70 years.

The age of the building is calculated from the year of construction to the valuation date. For a single-family home built in 1975 with a total useful life of 80 years, the age in 2026 will be 51 years and the calculated remaining useful life will be 29 years. However, this purely calculated RUL does not always reflect the actual condition.

What matters in practice is the modified remaining useful life, which can be extended through renovations. The Property Value Guidelines provide for the so-called point grid method for this purpose. This method evaluates renovation measures in various areas: roof replacement, window replacement, heating system modernization, thermal insulation of exterior walls, replacement of electrical wiring, bathrooms and plumbing, interior finishing, and floor plan modifications. Depending on the scope of the measures carried out, points are awarded that determine the degree of modernization. This degree of modernization is used in a table to calculate an extended remaining useful life. A building that has undergone a complete core renovation can thus achieve a RND that comes close to the original total useful life.

Significance for the Cost Approach and Income Approach

In the Cost Approach, the remaining useful life determines the building’s age-related depreciation. The shorter the RND, the higher the percentage discount from the construction cost. A building with a total useful life of 80 years and a RUT of 20 years has already consumed 75 percent of its economic life, which is reflected in a correspondingly reduced property value.

In the income approach, the RUT influences the multiplier (present value factor) used to capitalize the net income. A longer remaining useful life leads to a higher multiplier and thus to a higher income value. In the valuation, the minimum RUL is generally 30 percent of the total useful life, even if the building is older in mathematical terms-this prevents older but still well-utilized buildings from tending toward zero in the calculation.

Remaining Useful Life and Financing

Banks and financial institutions take the remaining useful life into account when evaluating collateral and calculating the mortgage lending value. A short remaining useful life means that the building loses value as collateral before the loan is fully repaid. This can lead to lower loan-to-value ratios or shorter maximum loan terms. For a building with a remaining useful life of only 20 years, banks are unlikely to grant a 30-year financing term-the risk of diminishing collateral would be too high.

For investors in existing real estate, this means: A short calculated remaining useful life not only limits the appraised value but also the financing options. Anyone who buys and renovates an older building thereby increases both the mortgage value and financing flexibility-provided the renovations are carried out professionally and documented.

Documentation of Renovations as a Value Driver

From a valuation perspective, comprehensive documentation of all renovation measures is of great importance. Appraisers can only apply a modified RND if the measures are substantiated-through contractor invoices, building permits, photos, or inspection reports. Measures that cannot be substantiated are not included in the valuation or are included only at a discount.

We recommend that owners maintain a structured modernization folder: For each measure, there should be an invoice with the date, trade, and description of services. Even smaller measures-new electrical wiring, interior doors, bathroom renovations-add up and can significantly improve the modified RND. When planning a sale, this folder is an important selling point and can make the difference between a low valuation and a realistically higher one.

Practical Tip for Property Owners in Nuremberg and Franconia

In the Nuremberg metropolitan region, we regularly appraise existing properties from the 1950s through the 1970s that, without documented renovations, have only a short remaining useful life according to calculations. We recommend that owners thoroughly document all modernization work performed, as each documented measure can extend the modified RND and significantly increase the property’s value.

Especially in Nuremberg neighborhoods such as Gostenhof, Johannis, or the Südstadt, where older buildings dominate, the difference between a calculated remaining useful life of 15 years and a modified remaining useful life of 40 years can amount to a value difference of tens of thousands of euros. We recommend systematically storing invoices and photos of renovation work-preferably digitally and organized by year and trade. As part of our valuation consulting services, we help you prepare existing modernization documentation in accordance with expert standards.

Frequently Asked Questions

What is the difference between remaining useful life and remaining structural life?

The remaining useful life refers to a building’s economic usability and is a key parameter for valuation. The remaining structural life, on the other hand, describes the technical stability of the building’s structure and can be significantly longer. A building with an economic remaining useful life of zero years may technically remain standing for decades, but is so economically worn out that demolition and new construction would make more sense than renovation.

Can the remaining useful life be extended?

Yes. Modernization measures can significantly extend the modified remaining useful life. The point grid method of the Property Valuation Guidelines evaluates modernizations across up to eight categories. A comprehensive core renovation can reset the RND to nearly the full total useful life. Individual measures such as a new heating system or window replacement have a smaller but still measurable effect.

What is the remaining useful life of a typical post-war building in Nuremberg?

A solidly constructed apartment building built in the 1960s typically has a total useful life of 70 years. By 2026, the building will be approximately 60 years old, meaning the calculated remaining useful life (RND) will be only 10 years. However, if the heating system, windows, and roof have been replaced in the last 20 years, the modified RND can be increased to 25 to 40 years, depending on the scope of the work. An expert appraisal is particularly worthwhile in such cases.

How does a short remaining useful life affect the purchase price?

A short remaining useful life reduces the purchase price in two ways: first, through the higher age-related depreciation in the asset value method, and second, through the lower multiplier in the income value method. Added to this are the limited financing options, which deter potential buyers or force them to make lower offers. As a seller, we therefore recommend carrying out verifiable renovations before the sale and compiling all available documentation to optimally present the modified remaining useful life. A professional appraisal that correctly applies the modified remaining useful life can significantly improve the achievable purchase price.

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