14 Dec 2025

Building Expert Assessments – When They Are Necessary and What They Involve

Data of last update: 14.12.2025

Building expert assessments are a key element of the safe use of building structures and an integral part of the process of maintaining properties in proper technical condition. In many situations related to the operation of buildings, it becomes necessary to carry out a detailed analysis of the technical condition of the structure, which goes beyond standard periodic inspections and requires specialized engineering knowledge. Property owners and managers must be aware of the circumstances in which a building expert assessment becomes necessary, both from the perspective of user safety and legal requirements arising from the Construction Law and the activities of the Building Supervision Authority.

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Damage and Failures as the Main Reason for Commissioning Expert Assessments

During the use of a building, defects and failures may occur affecting various elements of the structure, installations, or foundations. Damage may result from the natural aging of construction materials, improper use of the building, design or construction errors, as well as external factors such as weather conditions or ground vibrations.
In the event of damage or failures of building structures, a building expert assessment becomes necessary to determine the causes of the problems, assess the technical condition of the structure, and indicate the required repair measures. An owner or manager who notices alarming signs such as wall cracks, deformation of structural elements, moisture, or other symptoms of deterioration should immediately commission a building expert assessment in order to prevent further degradation and ensure the safety of building users.

Expert Assessments Required by the Building Supervision Authority

In the event of defects and failures, the Building Supervision Authority often initiates administrative proceedings in which it frequently obliges the owner or manager to submit a building expert assessment of the structure. Proceedings before the Building Supervision Authority may be initiated ex officio, at the request of interested parties, or as a result of inspections carried out by the authority.
A building expert assessment required by the Building Supervision Authority during administrative proceedings must be prepared by persons holding appropriate construction licenses and experience in diagnosing the technical condition of buildings. An owner or manager required to submit an expert assessment should take immediate action, as failure to comply may result in additional sanctions imposed by the authority and, in extreme cases, an order to suspend the use of the building until the situation is clarified and irregularities are remedied.

Changes in Structural Loads as Grounds for an Expert Assessment

A change in the use of a building or the installation of additional equipment often results in changes in loads, which in turn necessitates verification of whether the structure can safely carry the new loads. In such cases, a building expert assessment aims to verify the load-bearing capacity of the existing structure and determine whether it requires strengthening or other remedial measures before the planned changes are introduced.
A particularly important example of load changes is the installation of photovoltaic systems on building roofs, which introduces additional permanent loads resulting from the weight of panels, supporting structures, and equipment, as well as variable loads related to wind and snow. Owners planning to install photovoltaic systems should commission a building expert assessment prior to commencing work to verify whether the roof structure and the entire static system of the building can safely carry the additional loads. This helps prevent future problems and ensures compliance with construction regulations.

Expert Assessments for Renovations and Changes of Use

Building expert assessments are essential in the case of renovations and changes in the use of buildings, which may significantly affect the structural behavior and require adaptation of existing elements to new requirements. Renovation of a building often involves interference with the load-bearing structure, changes in room layout, or the introduction of new openings in walls or floors, all of which require a detailed analysis of the impact of planned changes on the safety and stability of the entire building.
Changes in the use of premises—for example, converting a residential building into a commercial facility or changing storage areas into office space—are associated with new requirements regarding imposed loads, which may differ from the original design assumptions. In such cases, a building expert assessment helps determine the scope of necessary structural strengthening and ensures that the building, after renovation or change of use, will be safe for users and comply with all technical and legal requirements.

Representation Before the Building Supervision Authority

During administrative proceedings conducted by the Building Supervision Authority, owners and managers of buildings often require support from specialists who represent their interests and assist in the proper conduct of the entire process. Representation of an investor before the Building Supervision Authority requires not only technical knowledge of the building’s condition but also familiarity with construction law regulations and administrative procedures applicable in such proceedings.
Professional representation enables effective communication with the authority, clear presentation of technical arguments, and ensures that all required documents, including building expert assessments, are prepared and submitted in the correct form and within the required deadlines. Owners or managers who engage specialists to represent them before the Building Supervision Authority gain confidence that their case is handled professionally and in compliance with applicable regulations.

Comprehensive Building Expert Services at METIB

METIB offers comprehensive services in the field of building expert assessments and technical opinions, covering all situations that require a detailed analysis of the technical condition of building structures. The company prepares expert assessments necessary in cases of damage and failures, changes in loads, renovations, and changes of use.
Since expert assessments and technical opinions are often required by the Building Supervision Authority during administrative proceedings, METIB provides not only professional technical documentation but also representation of investors before the Building Supervision Authority. The company delivers building expert services in many locations, including Bielsko-Biała, Częstochowa, Zielona Góra, Katowice, and Toruń, enabling efficient service for clients from various regions of Poland. METIB’s comprehensive approach includes not only technical diagnosis but also preparation of repair and structural strengthening designs, providing full support for owners and managers at every stage of property maintenance.

Summary

Building expert assessments are necessary in many situations related to the use of building structures, including cases of damage and failures, changes in structural loads, renovations, and changes of use. During building operation, defects and failures may occur that require a detailed technical analysis beyond standard periodic inspections.
The Building Supervision Authority often initiates administrative proceedings in which it obliges the owner or manager to submit a building expert assessment, making it a legally required document. Expert assessments are particularly important when loads change, such as during the installation of photovoltaic systems on roofs, as they verify whether the structure can safely carry the new loads. Professional representation before the Building Supervision Authority ensures proper handling of administrative proceedings and effective communication with the authority. METIB offers comprehensive expert assessment and technical opinion services in multiple locations, including Bielsko-Biała, Częstochowa, Zielona Góra, Katowice, and Toruń.

FAQ – Frequently Asked Questions About Building Expert Assessments

When is a building expert assessment necessary?
A building expert assessment is necessary in cases of damage and failures, changes in loads such as photovoltaic installation, renovations, and changes of use. It is also required by the Building Supervision Authority during administrative proceedings.

Can the Building Supervision Authority require a building expert assessment?
Yes. In the event of defects and failures, the Building Supervision Authority often initiates proceedings in which it obliges the owner or manager to submit a building expert assessment. This is a legal requirement, and failure to comply may result in sanctions.

Does installing photovoltaic systems require a building expert assessment?
Installing photovoltaic systems on roofs often results in changes in loads, which makes it necessary to verify whether the structure can safely carry the new loads. In such cases, a building expert assessment is recommended or required.

What situations require an expert assessment when changing the use of a building?
A change of use often involves new loads and technical requirements. A building expert assessment helps determine whether the existing structure is suitable for the new purpose and whether structural strengthening is required.

What happens if the owner fails to submit an expert assessment required by the authority?
Failure to submit an expert assessment required by the Building Supervision Authority may result in additional sanctions and, in extreme cases, an order to suspend use of the building.

Is an expert assessment required for every renovation?
Building expert assessments are required for renovations involving interference with the load-bearing structure, changes in room layout, or the introduction of new loads. The scope of the assessment depends on the nature of the planned changes.

Who can represent the owner before the Building Supervision Authority?
Representation before the Building Supervision Authority may be carried out by specialists with technical expertise and knowledge of construction law regulations.

In which cities does METIB offer building expert assessments?
METIB provides building expert assessment services in many locations, including Bielsko-Biała, Częstochowa, Zielona Góra, Katowice, and Toruń, serving clients across different regions of Poland.