The purpose of as-built surveying is the measurement and documentation of the position and other technical characteristics of completed buildings, structures, or parts thereof. 

By its nature, as-built surveying is divided into two categories:

• As-built surveying of a completed object: utility networks (pipelines, cables, etc.), roads, paved areas, and any completed structures. These works are carried out in accordance with the above-mentioned procedure.

• As-built surveying of an object under construction, including its components: earthworks, construction bases, foundation elements, concrete works, load-bearing structures, elevator shafts, etc. These works are not regulated by the above-mentioned procedure.

The output of an as-built survey of a completed object is a drawing provided both on paper and in digital format, which is also submitted to the local municipality. The output format of as-built drawings for objects under construction is agreed upon between the surveyors and the contractor.

Increasingly, modern technologies such as laser scanning and photogrammetry are used in as-built surveying in addition to traditional measurement methods.

As-built surveying of underground utility networks is particularly important. At the time of measurement, the trench of a pipeline or cable must be open at least at junctions and bends. Otherwise, it is not possible to determine the position of the installed pipeline or cable with sufficient accuracy. Inaccurate as-built survey data may be the main cause of damage to pipelines or cables during later excavation works. In addition, as-built surveying determines several other important parameters, such as the gradient of gravity-flow pipelines.

For REIB, as-built surveying is an important field of activity. We have extensive experience and expertise in carrying out this work professionally. Our quality management system enables us to ensure a key requirement for contractors—operational efficiency. Furthermore, our specialists have participated in the development of the above-mentioned procedure, which means we know exactly what requirements a proper as-built drawing must meet.

When accepting an as-built surveying order, it is necessary to know the most suitable time for measurement (the structure completed and the trench still open), the extent of the object to be surveyed, the construction materials used, and whether there are any special requirements not specified in generally applicable regulations.

Ordering as-built drawings is the contractor’s obligation; as-built drawings are part of the construction completion documentation.