Industrial drawing survey
when the drawings you have no longer match the building
A drawing survey measures an industrial building or plant exactly as it is built today and turns that measurement into reliable drawings. When the drawings you have were lost, remained on paper, or stopped matching reality, the survey restores a reliable planimetry on which to decide again.
Keep reading: “I don’t have reliable drawings of my building”, and what to do about it ↓
“I don’t have reliable drawings of my building”
It is the sentence with which almost every project begins. The plant has been running for years, has changed many times, and the documentation has been left behind. It happens to almost any facility that is still operating.
The original drawings of the building were lost, or are in a drawer on paper, or remain in a DWG that no longer represents what is installed. Every recent job — a new line, a pipe rack, an electrical panel — went in without the drawings being updated. And a good part of the plant’s knowledge lives in the head of one person: the veteran who knows where every run passes and which pipe is out of use.
While everything works, people live with it. The problem appears when you have to decide on the plant: design an extension, put a job out to tender, prepare a permit regularisation or value the asset. At that point, intervening on a drawing that no longer tells the truth is expensive, and measuring by hand every time a dimension is needed is slow and introduces errors.
- The drawings do not match the building. What is installed stopped matching what the drawing says after years of undocumented changes.
- The knowledge is in one head. Only the plant manager or a veteran operator knows where each installation runs, and that knowledge lives only in their memory.
- Every project starts by measuring by hand. Before any job, measurements have to be taken again with a tape and a laser distance meter, with the delay and margin of error that implies.
A drawing survey solves a specific problem: recovering a faithful planimetry of your building when the one you have was lost or stopped matching reality, so that you can decide on real data and not on an archived drawing.
What a reliable planimetry is
The key word is “reliable”: the drawing matches the real plant, not what was designed twenty years ago.
A reliable survey does not redraw the old drawing: it measures what is actually installed — the structure, the electrical and fluid services, the equipment and the pipework — and draws it as it is. The difference from an inherited drawing lies in the check against reality: the real geometry of the plant is taken and compared with the existing documentation and with the plant manager, who contributes what no measurement sees — which equipment does what, which line is no longer in use.
The result is a reliable base to work from: the as-built drawings of the area, measurable and owned by you, and — if you wish — the BIM model of the facility. Ultimately, a survey and a drawing digitisation are the same thing seen from two angles: moving from documentation that no longer matches to documentation that matches the real facility and serves as a basis for decisions about it.
A reliable planimetry is one that matches the plant as it is built today: it is obtained by measuring reality and checking it against the existing documentation and against the people who know the plant, not by copying an inherited drawing.
From manual survey to 3D laser scanning
Plants have always been surveyed; what has changed is how they are measured. There are four current methods, and each performs best in a different setting.
For decades, a survey was done by hand: tape measure, laser distance meter and sketches on site. It works in simple spaces, but in a dense industrial plant it is slow, requires interpreting every dimension and carries errors that accumulate from station to station. Today’s measurement turns that logic around: instead of deciding on site what to measure, all the geometry is captured first and the work is done afterwards on the data.
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Traditional method
Manual survey
Tape measure and laser distance meter, with sketches taken on site. Valid for simple geometries; in a plant with dense equipment and pipework it is slow, interpretive and prone to accumulated errors.
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Points and axes
Industrial surveying
A total station positions points and axes with precision. It is the way to georeference the plant and to cover exteriors or long distances, but on its own it does not capture the dense interior of equipment and pipework.
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From photographs
Industrial photogrammetry
It reconstructs geometry from many overlapping photographs. It works well on façades, roofs and wide surfaces; in very crowded process rooms it loses the detail hidden between equipment.
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What A3D does
3D laser scanning with point cloud
The scanner measures the interior of the plant point by point and at very high density, and generates a point cloud: a metric replica of the facility. It is the method that captures the real detail — equipment, pipework, structure — that the others leave out, and the one on which A3D builds the drawings and the model.
The methods are not mutually exclusive: when the project calls for it, laser scanning is combined with topographic georeferencing so that the model matches the mapping and other projects on the site. The underlying logic is the same in all of them: let the instrument capture the real geometry instead of interpreting each measurement by hand, so that the final drawing rests on verifiable data.
A3D surveys industrial plants with a 3D laser scanner: it measures the facility point by point in a point cloud and on it reconstructs the as-built drawings and the BIM model, faithful to the real plant as measured.
If you would like us to look at yours, we will tell you how we would survey it — scope, timescale and what you receive — before anything is moved.
From measurement to your drawings and your model
A survey does not end with the capture: what you take away are usable documents, in standard formats and owned by you.
The measurement first produces the point cloud, which is already a navigable, measurable document in itself, before anything is drawn. On it, the as-built drawings of the area are built — plans, elevations, sections and services, including those of an electrical installation survey when it falls within the scope — and, if you wish, the BIM model of the facility: the base on which the extension is designed, coordinated with the engineering firms and, later, kept up to date as the plant’s source of truth. The detail of what an as-built drawing includes and in which formats it is delivered is in as-built drawings; and if the term BIM is new to you, what BIM is explains it without jargon.
How to commission a drawing survey
You do not need to survey the whole plant to begin. The work is bounded to the area you are going to intervene in, with everything fixed before starting.
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Define what you need it for
An extension, a tender, a permit regularisation, valuing the asset: the objective determines what has to be surveyed and in how much detail. What the decision needs is surveyed, not everything equally.
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Technical visit and scope
An engineer walks the area with you and defines what to measure. You leave with scope, timescale and price fixed for that job, before starting. The sales visit is free of charge.
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Measuring the real condition
The plant is scanned exactly as it is, with production running, capturing the real geometry — including what appears on no drawing — and checking it with the plant manager.
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Delivery of your drawings
You receive the point cloud and the as-built drawings of the area — and the BIM model, if you asked for it — in standard formats and owned by you. The complete process, milestone by milestone, is set out in how we survey it.
Questions about drawing surveys
Answers to the most common searches about recovering the planimetry of an industrial plant.
What is a drawing survey of an industrial building or plant?
A drawing survey is the work of measuring a building or plant exactly as it is built today and translating that measurement into reliable drawings. In a reliable industrial survey, reality is measured — structure, services, equipment and pipework — and what is actually installed is drawn, rather than copying an old drawing. A3D does it with a 3D laser scanner, which captures the real geometry point by point in a point cloud, and on that basis builds the as-built drawings and the BIM model of the facility.
I have no drawings of my building, or the ones I have no longer match reality. How do I start?
It is the most common situation: the original drawings were lost, remained on paper, or stopped matching the plant after years of changes that nobody documented. The starting point is to measure the real condition. On a visit, we define which area is of interest according to what you are going to do with the drawings — an extension, a tender, a permit regularisation — and the scope is bounded. From there, laser measurement reconstructs your drawings faithful to what is there today.
What is the difference between industrial surveying, photogrammetry and 3D laser scanning?
They are three ways of measuring. Industrial surveying positions points and axes with a total station, and is useful for georeferencing and for exteriors or long distances. Photogrammetry reconstructs geometry from many photographs, and works well on façades and surfaces. 3D laser scanning measures the dense interior of a plant — equipment, pipework, structure — point by point and at very high density; it is the method A3D uses to survey industrial plants, because it captures the real detail that the others leave out. When the project calls for it, it is combined with georeferencing.
Can the survey be done with production running?
Yes. A3D scans with the plant running: the scanner captures the geometry from each station while activity continues. Routes and access windows are planned with your plant team, and in areas that require it, work is carried out with a minimum crew of two people in the field for occupational health and safety reasons.
How much does an industrial drawing survey cost?
It depends on the size of the area, the density of equipment and pipework, and what you need to receive — as-built drawings only, or the BIM model too. It can be bounded to the area you are going to intervene in, with scope, timescale and price fixed before starting, and the rest of the plant decided with that first job already in hand. A first area starts from around €6,000 (estimated); the detail is in the pricing guide.
What is drawing digitisation?
Digitising drawings means turning your old documentation — paper, PDF or DWG that no longer matches — into drawings and a model checked against the reality of the plant. The difference lies in the check: instead of redrawing an old drawing, what is there today is measured by laser and compared with the existing documentation and with the plant manager, so that the result matches the real facility and serves as a basis for decisions about it.
If this describes your building, the next step is to measure
Recovering the planimetry of your plant starts with real data: what is installed today, measured accurately. We do this work every day on industrial plants that are running, and we can look at it for yours — which area to survey first, with what scope and what you receive — before you move anything.
A3D produces the drawings and the as-built BIM model of existing industrial plants from laser scanning, faithful to the real condition as measured.
What state are your drawings in?
Before planning a job, the useful step is to know where you stand. Tell us about your plant: an A3D specialist will tell you in 15 minutes where to start, which area to survey first and with what scope.
Want the detail? See what an as-built drawing includes or how much it costs to digitise a plant.