About Calculating Spaces Based on the DIN 277 Standard

DIN 277 is the area calculation standard for Germany and German-speaking countries. The DIN 277 standard included in AutoCAD Architecture 2023 toolset includes the subset of DIN 277 rules described in the following sections:

Space Classifications in DIN 277

The space type classifications in DIN 277 are the following:

Space Type_DIN	Definition
A	has roof fully enclosed by walls or curtain walls on all sides the wall or curtain wall is as high or higher than the space=full height enclosure
B	has roof partially enclosed by walls or curtain walls at least one wall or curtain wall is lower than the space=partial height enclosure
C	no roof
Exterior	exterior space

The net area type classifications in DIN 277 are the following:

NetArea Type_DIN	Use
Utilized	Living, office, production, craft, experiments, storage, sale, education, culture, health care, other uses
Technical	Operations, mechanical room, water supply, heating room, electrical room, etc.
Circulation	Halls, corridors, stairs, elevators, etc.

Calculation Rules for AutoCAD Objects

You can use AutoCAD objects like closed polylines or rectangles to generate a space that is deducted from an associative space. You could do this for example to represent construction spaces or otherwise unavailable areas. Since AutoCAD objects cannot be classified to control their behavior, the following standard behavior is applied to enclosed deducted spaces formed by AutoCAD objects in the DIN 277 standard:

• Net area: the enclosed area is deducted from the net area.
• Gross area: the enclosed area in not deducted from the gross area.

Net Area Calculations

The net boundaries are created on the inside of the walls.

Technical spaces: When the area of a technical space is larger than or equal to 1 m ² , the net boundary will be calculated to the inside of the wall. When the area of a technical space is smaller than 1 m ² , the space will not have a net boundary, and the area will be calculated as constructive area.

Gross Area Calculations

The gross boundaries are created according to the following rules:

Gross Area (Space Type_DIN A)
Adjacent Space	Boundary
Space Type_DIN A	Measured from centerline of wall
Space Type_DIN B or C, or no adjacent space	Measured from outside face of wall
Adjacent space not classified (unspecified)	Measured from outside face of wall

Gross Area (Space Type_DIN B)
Adjacent Spaces	Boundary
Space Type_DIN A	Measured from inside face of wall
Space Type_DIN B	Measured from centerline of wall
Space Type_DIN C or no adjacent space	Measured from outside face of wall
Adjacent space not classified (unspecified)	Measured from outside face of wall

Gross Area (SpaceType_DIN C)
Adjacent Spaces	Boundary
Space Type_DIN A or B	Measured from inside face of wall
Space Type_DIN C	Measured from centerline of wall
No adjacent space	Measure from outside face of wall
Adjacent space not classified (unspecified)	Measured from outside face of wall