Structural analysis

Structural review refers to the independent verification of structural calculations and construction drawings by a state-certified structural engineer. It is an essential part of the building permit process and ensures that a structure possesses the required stability, load-bearing capacity, and fitness for use. Only after the inspection report has been submitted does the building authority typically grant approval for the construction of load-bearing components.

Responsibilities of the Structural Engineer

The structural engineer reviews the structural calculations, reinforcement plans, and construction drawings prepared by the structural engineer (structural designer) for completeness, accuracy, and compliance with applicable standards (primarily Eurocodes and DIN standards). They assess whether the applied loads are realistic, whether the building materials have been selected correctly, and whether the structure is safe in the event of an earthquake. In Bavaria, the structural engineer is appointed by the competent building supervisory authority (district office, independent city); their costs are borne by the building owner.

When is a structural review required?

The requirement for a review is determined by the state building code of the respective federal state and the building class of the construction project. In Bavaria, the BayBO generally requires a structural review for building classes 4 and 5 (buildings taller than 13 meters or with special uses); for simple residential buildings in classes 1-3, the building authority may waive the structural review if the structural calculations were prepared by a design engineer authorized to submit building plans. For construction work on existing buildings-such as additions, renovations, or the removal of load-bearing walls-a structural review is also frequently required.

Process and Costs of the Structural Review

After the building documents are submitted, the building authority forwards the structural documents to the review engineer. The engineer typically prepares a review report within four to eight weeks. Notices of defects and additional requests extend the process. The Fee Schedule for Architects and Engineers (HOAI) does not apply directly to structural engineers; their compensation is based on state fee schedules and the amount of work involved. For a medium-sized single-family home, inspection costs of 1,000 to 3,000 euros are typical; for commercial buildings or special structures, the costs can be significantly higher.

Structural Analysis and Existing Buildings: Special Challenges

When renovating existing buildings, the structural analysis is often more complex than for new construction because the original construction documents are missing or incomplete. In Nuremberg’s Wilhelminian-style buildings, for example, construction documents were often not fully archived or were destroyed during wartime damage. In these cases, the structural engineer must first conduct a site survey and prepare structural documentation before performing structural calculations for the modifications. This takes time and money but is essential to establish a reliable foundation for the structural analysis.

Practical Tip for Property Owners in Nuremberg and Franconia

Anyone renovating or adding stories to a building in Nuremberg or the surrounding area should plan for the structural analysis early on-both in terms of time and budget. Especially with older residential buildings constructed during the Wilhelminian era or the 1950s through 1970s, the actual load-bearing capacities of the floors may differ from the design assumptions. For example, anyone wishing to remove load-bearing walls or convert an attic typically requires a structural analysis, even if the building falls into building classes 1 through 3.

We recommend involving an experienced structural engineer from the region as early as the planning phase, who will work closely with the responsible inspection engineer and expedite the process. The Nuremberg City Planning Office also offers preliminary inquiries upon request, allowing you to clarify the structural review requirement for a specific project in advance-this helps you avoid surprises when submitting your building permit application. Contact us; we can recommend experienced structural engineers who regularly work with Nuremberg’s historic building stock.

Difference Between Structural Engineering and Structural Review

The terms “structural engineering” and “structural review” are often confused in everyday conversation-yet they refer to fundamentally different services. The structural engineer (also known as a structural analyst) prepares the structural calculations and reinforcement plans on behalf of the building owner. They are part of the planning team and are responsible for the correct calculations. The structural engineer, on the other hand, is independent of the construction project and reviews the structural engineer’s work on behalf of the building authority. They must not be the same person as the structural engineer-this independence is required by law.

This division is not a bureaucratic end in itself, but a proven dual-control principle: errors in the structural design, which can occur even to an experienced structural engineer, are caught by an independent inspector before they reach the construction phase. In practice, this often leads to inquiries, additional requirements, and corrections-which takes time but prevents structural damage.

Structural Review and Property Value

A properly reviewed and approved construction project has a direct impact on property value. Buildings with unresolved structural issues-such as walls removed without structural analysis or unauthorized additions-may face significant value reductions during appraisal. Banks sometimes refuse to finance such properties because their mortgageability is limited. Anyone wishing to sell a property that has undergone structural alterations without a structural engineering review should clarify this early on-in the worst-case scenario, retroactive approval or even demolition may be required.

Frequently Asked Questions

Who pays the structural engineer?

The costs are borne by the building owner. In Bavaria, they are collected via fee notices from the building authority; the structural engineer bills the authority directly for their services. The building owner has no say in the selection of the structural engineer-this is the responsibility of the building authority.

Can I start a renovation before the structural analysis is available?

No. Work involving load-bearing elements or safety-critical aspects may not begin until the structural engineer has granted approval. Anyone who builds without approval risks a construction halt, demolition orders, and fines. In serious cases-such as when a load-bearing wall has been removed without permission-the authorities may order complete demolition at the builder’s expense, even if the building is structurally sound.

Does the structural analysis also apply to energy-efficient renovations?

For insulation measures involving only the building envelope, a structural analysis is usually not required. However, if the insulation significantly alters the load assumptions for the roof or facade-such as when adding insulation to an existing roof structure-a structural engineer should be consulted as a precaution to determine whether a formal structural analysis is necessary.

How long is a structural analysis report valid?

A structural analysis report is tied to the specific approved project. It loses its validity if the plans are significantly altered-for example, if components differ in type, dimensions, or material. Significant changes to the plans during the construction phase must be resubmitted to the structural engineer. In such cases, a new permit and an updated structural analysis report are mandatory.

Back to the Real Estate Glossary.