The correct dimensioning of a plot of land and a building plan is essential in order to be able to carry out subsequent building projects accurately. After all, the aim here is to properly represent the planned structure or the building that is to be renovated. Even small mistakes can have fatal consequences in planning. It is often assumed that only the floor plans are shown on the plan to a certain scale – this is not the case. Instead, plans must have far more extensive dimensions in order to actually be implemented. The simple floor plans are therefore only those that the layman can see. When it comes to the construction plan, you will come across a lot more drawings, characteristic curves and the like. In this sense, the correct dimensioning is more complex than you might think – but not impossible for you as a layman! Because especially with our software, the ArCADia BIM 3D Architect, construction plans with the correct dimensions can be created by you as a beginner in no time at all.

What should you watch out for when dimensioning?

So we have found that correct dimensions are important for the quality of the construction plan and for further work with it. For this reason, several things need to be taken into account when dimensioning, which range from general to standardized specifications. Because even if the way to a proper and extensive floor plan seems difficult, everything will be easier when it is finished. The goal is therefore that all data and dimensions can be easily read from the drawing at the end. Afterwards, neither calculations nor many thoughts should be necessary. In order to maintain this high level of ease in further planning, you should therefore pay attention to various points relating to the drawing of the floor plan.

The orderly presentation of the floor plan is always particularly important. Legible font and an appropriate font size are particularly important when this is drawn by hand. This step is of course simplified with various planning software such as ArCADia BIM 3D Architects. If you again draw the floor plan by hand, it is best to use the DIN 406 and DIN 1356 standards as a guide. In these you will find numerous specifications relating to the representation of the dimensions. You can also easily find out what these are online

First and foremost: find the right scale

The time has come: start drawing and dimensioning the floor plan! At this point you are already dealing with the first decision. So you have to find the right scale. However, contrary to what is often assumed, this is not always freely selectable. It is primarily a matter of determining a scale that represents the entire construction plan in an appropriate size and is therefore easy to understand. Accordingly, it must be proportionate, in that there is space for all the details on the paper and all dimensions can also be easily displayed. However, this does not mean that you now have to experiment with numerous ratios. In fact, there are specific specifications for the scale, which differ from industry to industry. For example, while site plans are shown relatively small, a low ratio, for example 1: 5, is required for detailed drawings. This of course varies with the real size of the detail. The given proportions are based on the mostly actual size. However, one yardstick is often not enough, especially for comprehensive plans. A general relationship is used here. In addition, details within this plan are displayed in different scales, which are of course noted on the plan.

That includes the professional blueprint

While finding the right yardstick is the first step towards a professional plan, it is defined by a lot more. Because only with the right scale is your blueprint useless. Instead, various details are required which provide more information. This includes, for example, the dimension lines, which represent the actual floor plans and can be recognized by solid lines. To define this as a route, they are terminated by a boundary. This is revealed either as a slash or as a point at the end of the line. The lines are now drawn and the scale is indicated – but how high are the dimensions? So that you no longer have to worry about calculating and instead simply read everything from the plan, you now need the so-called dimensions. These indicate the number of units of measurement and must be easy to read at first glance. Therefore, draw it in with the unit of measurement centered above the dimension line. However, especially with extensive drawings, there may be a lack of space, in which case you can also enter the numbers on the side.

For the sake of precision, you must be meticulous when specifying numbers. After all, even small mistakes can cause problems later. Accordingly, fractions of the unit of measurement must also be specified precisely. Always pay attention to the ratio used, as an error in the calculation can later lead to serious mistakes.

Diversity: these different dimensions exist

Since all the details of the floor plan must be included in your construction plan, there are also a wide variety of dimensions. All of these must be observed and accurately marked. The focus is usually on the length dimensioning, which includes all kinds of floor plans. This therefore applies to the external dimensions, the internal dimensions or the room thickness. So that the different delimitations can be recognized, details such as openings or pillars must also be observed and entered. In the other direction, the height dimensioning plays an important role. This indicates the height of the individual rooms or floors. In addition, it also identifies all other elements that protrude upwards. These include, for example, windows or doors. How much space different elements take up is determined by the thickness dimensioning, which indicates the thickness of the individual components. It is marked with a “t” and is particularly important for later implementation with the help of the construction plan in order to avoid construction errors. The same applies to the angular dimensions, which provide more information about the course of the individual elements. Architectures are often variable and by no means only exist in simple geometric shapes.