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An as-built drawing records the actual position of completed structures, utility networks, and individual elements of a facility after construction or installation works have been performed.
It shows actual coordinates, elevations, dimensions, references, and deviations from the design values. This allows the client to verify whether the completed work complies with the approved design and whether the next stage of construction can be accepted.
As-built drawings in construction form part of the documentation confirming the actual execution of works. They are especially important for structures and utilities that will later be concealed by concrete, soil, finishes, or subsequent building elements.
An as-built drawing is a graphical document prepared on the basis of control measurements of completed structures, utility networks, or individual sections of a facility.
A design drawing shows how an element should be positioned, while an as-built drawing shows how it is actually positioned.
The document makes it possible to compare design and actual values, determine the magnitude of deviations, and establish whether the completed work can be accepted for subsequent construction stages.
An as-built geodetic drawing is prepared on the basis of measurements carried out by a specialist using geodetic equipment. The data must make it possible to clearly determine the position of the inspected element relative to construction axes, benchmarks, the coordinate system, and elevation marks.
As-built drawings allow the client, contractor, designer, and technical supervision specialist to verify whether the completed element complies with the design before the next stage begins.
They are used when accepting foundations, monolithic structures, columns, floor slabs, external utilities, pipelines, cable routes, and other elements of a facility.
As-built drawings also help:
— identify deviations before structures are concealed
— confirm the scope and quality of completed works
— determine the actual position of hidden utilities
— prepare concealed works inspection reports
— provide reliable information to the operating organisation
— simplify future repairs, reconstruction, or technical inspections
According to Article 28 of the Urban Planning Code of the Republic of Uzbekistan, technical control is carried out by the client with the involvement of a certified specialist or an organisation authorised to perform such activities. The specialist regularly monitors the quality of construction and installation works and, after completion, issues a conclusion on their quality.
An as-built drawing must be prepared on the basis of actual geodetic measurements and must make it possible to clearly identify the position of the inspected structure or utility network.
The document should indicate the facility and work area, construction axes, coordinates, elevations, design and actual dimensions, references to permanent points, and identified deviations. All symbols must be clear, and the information shown on the drawing must correspond with inspection reports, work logs, and design documentation.
It is not sufficient to copy a design drawing and state that the works were completed without deviations. An as-built drawing must reflect the actual measurement results, including the real position of elements and any discrepancies from the design.
Measurements should be carried out using calibrated instruments, and the results must be reliable and verifiable. General requirements for the quality of geodetic materials and the use of measuring equipment are established by the Law of the Republic of Uzbekistan “On Geodetic and Cartographic Activities”.
An as-built drawing is prepared after completion of the stage being inspected but before subsequent works conceal the structure or make it inaccessible for proper inspection.
For example, the position of foundations should be checked before construction of the load-bearing structures continues, reinforcement and embedded elements should be checked before concreting, and underground utility networks should be surveyed before trenches are backfilled.
Postponing the preparation of as-built drawings until the end of construction creates significant risks. Once a structure has been concealed, some actual parameters cannot be reliably restored without opening the structure, performing additional measurements, or carrying out a technical inspection.
For each project, it is important to determine in advance which elements require as-built surveying, at what stage measurements must be taken, who prepares the document, and who verifies it before acceptance.
Geodetic as-built drawings are prepared by the specialist who performed the control measurements and processed the results.
The contractor must provide access to the structures being inspected and supply the design drawings, construction axis information, and source benchmarks.
The surveyor performs the measurements, compares the actual position of the elements with the design, and records the resulting data on the graphical base.
The technical supervision specialist checks whether the drawing corresponds with the actual completed work, the design, inspection reports, work logs, and other documentation.
We perform control geodetic surveys of excavations, foundations, monolithic structures, masonry, façades, external utility networks, and road infrastructure. Based on the measurements, we determine the actual position of elements, identify deviations from the design, calculate completed quantities, and prepare as-built drawings for work acceptance and inclusion in the as-built documentation.
The content of the drawing depends on the type of structure, but it must allow the measured object to be clearly identified and the actual result to be compared with the design.
An as-built drawing usually includes:
— name and address of the facility
— building, section, floor, or work area
— construction axes and benchmarks
— design and actual coordinates
— design and actual elevation marks
— dimensions and distances between elements
— magnitude and direction of deviations
— references to design drawings
— date of measurements
— equipment used
— information about the surveyor
— symbols and legends
— signatures of responsible specialists
For complex projects, one drawing may not be sufficient. Measurement schedules, deviation tables, explanatory notes, photographs, and other supporting materials may be attached.
An excavation as-built drawing shows the actual boundaries, depth, bottom elevations, slope positions, and compliance with design dimensions.
A foundation as-built drawing shows the position of structures relative to the construction axes, actual dimensions, top elevations, and deviations.
Separate drawings may be required for the foundation base, pile field, pile caps, foundation slabs, anchor elements, and other components.
An as-built drawing of monolithic structures confirms the actual position of walls, columns, beams, and slabs after concreting.
A column as-built drawing records displacement relative to the axes, elevation marks, and deviations from vertical alignment.
A floor slab as-built drawing may include actual surface elevations, structural thickness, positions of openings, and deviations from the design plane.
A formwork as-built drawing is used to check the position of the formwork before concreting. It does not replace the final inspection of the completed structure, since the formwork or individual elements may move during concreting.
A pipeline as-built drawing should show the actual route, diameters, elevations, slopes, joints, manholes, chambers, and references to permanent objects.
A water supply as-built drawing records the position of pipes, fittings, manholes, and connection points.
A sewerage as-built drawing should additionally confirm actual gradients and elevations, since errors in these values directly affect system performance.
As-built drawings of external utilities are particularly important after backfilling, when the position of underground infrastructure can no longer be visually determined.
An electrical as-built drawing shows the actual position of cables, trays, ducts, equipment, and connection points.
Electrical as-built drawings are necessary when cables are concealed in walls, slabs, trenches, or other locations that become inaccessible after completion.
A cable route as-built drawing should make it possible to identify the actual cable path, installation depth, crossings, joints, and references to permanent objects.
As-built drawings attached to concealed works inspection reports confirm the actual position of an element that will become inaccessible after the next stage of construction.
For example, when accepting an underground cable line, the inspection report confirms the quality of the concealed work, while the drawing shows the actual route of the line.
A report without reference to a specific section and measurement data provides limited information. Likewise, a drawing without an inspection report does not confirm that the work was properly presented and accepted by the parties responsible for control.
Verification begins by confirming that the document relates to the correct facility, section, and construction stage.
The drawing is then checked against the design drawing, coordinate system, construction axes, and elevation benchmarks.
Actual values are compared with design values and permissible tolerances. If a deviation exceeds the allowable limit, it must not be concealed or replaced with the design value.
The drawing is then compared with concealed works reports, work logs, measurement records, and the actual condition of the facility.
As part of technical supervision, specialists monitor the quality of works, compliance with the design, materials, and as-built documentation. The service also includes preparation and verification of reports, logs, and other construction records.
As-built drawings in Tashkent should be prepared immediately after completion of the relevant construction stage.
Specialists carry out control measurements, record the actual position of structures and utility networks, calculate deviations, and prepare graphical documents for inclusion in the as-built documentation.
Professional verification makes it possible to identify missing references, incorrect elevations, discrepancies from the design, preparation errors, and inconsistencies between the drawings and the actual condition of the facility.
To order geodetic measurements and preparation of as-built drawings, submit a request on the geodetic survey page.
An as-built drawing is not merely a formal attachment to an inspection report, but documentary evidence of the actual position of a completed element.
A reliable drawing must be based on control measurements, contain both design and actual values, show deviations, and be linked to a specific section of the facility.
Timely preparation and verification of as-built drawings reduces the risk of concealing defective structures, losing information about underground utilities, disputes with contractors, and delays in project acceptance.
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