Publisher
The Goodheart-Willcox Co., Inc.
Tinley Park, Illinois
© Goodheart-Willcox Co., Inc.
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Chapter 15
Plot Plans
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Introduction to Plot Plans
• A site plan is a (top) view drawing that
shows the contours of the building site
and location and orientation of any
buildings on the property.
• The plot plan shows both the property
and the proposed new construction.
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The Site Plan
• The purpose of a site plan is to show the
property lines and the existing topography of
the site.
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Length and bearing of each property line
Contour of the land
Meridian arrow
Existing streets, driveways, sidewalks and patios.
Lot number or address of the site
Scale of the drawing
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Typical Site Plan
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Plot Plan Features
• Plot plans contain:
– Length and bearing (direction) of each
property line.
– Location, outline, and size of buildings on
the site.
– Contour of the land.
– Elevation of property corners and contour
lines.
– Meridian arrow (north symbol).
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Plot Plan Features
• Plot plans also show:
– Trees, shrubs, streams, and gardens.
– Streets, driveways, sidewalks, and patios.
– Location of utilities.
– Easements for utilities and drainage.
– Well, septic tank, and leach field.
– Fences and retaining walls.
– Lot number or address of the site.
– Scale of the drawing.
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Property Lines
• Property lines define the site
boundaries.
• Length and bearing of each line are
identified.
• Measured to 1/100 foot.
• A benchmark is shown with a symbol
and represents a point of reference.
• The order of drawing property lines is
clockwise.
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Property Line Designation
• This property line is 175.25' long and has
a bearing of N 89° E.
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Bearings
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Benchmarks
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Drawing Property
Lines
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Contour Lines
• Contour lines help describe the
topography of a site by depicting the
shape and elevation of the land.
• Contour lines connect points that have
the same elevation.
• Contour interval is the vertical distance
between two adjacent contour lines.
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Contour Terms and Features
• Closely spaced contour lines indicate a
steep slope.
• Contours that are smooth and parallel
show that the ground surface is even.
• Closed contour lines represent summits
and depressions.
• Contour lines of different elevations do
not cross.
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Contour Lines
• This illustration shows a five foot
contour interval.
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Contour Lines
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Contour Lines
• The relative space of contour lines
represents the slope angle.
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Contour Lines
• Contour lines show relative roughness
of the land as well as the elevation.
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Contour Lines
• Summits and depressions are
represented by closed contour lines.
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Contour Lines
• Show estimated contours with a dashed
line. Surveyed contours are represented
by solid or long dashed lines.
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Contour Lines
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Contour Lines
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Contour Lines
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Contour Lines
• Contour lines plotted from an elevation
grid using data supplied by a surveyor.
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Topographical Features
• Topographical features include:
– Trees, shrubs, streams, roads, utilities,
fences, and similar features.
• These features are represented by
symbols; most are standardized.
• Nonstandard symbols should appear
with an explanation in a legend on the
drawing.
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Topographical Symbols
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Topographical Symbols
• When color is used with topographical
symbols, follow these guidelines.
– Black is used for lettering and human-built
works, such as roads, houses, etc.
– Brown represents all land forms such as
contour lines.
– Blue is used for water features.
– Green is for vegetation.
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Locating the Structure on Site
• Analyze the site to determine the ideal
location for the structure.
• Analysis should include:
– Natural contour, trees, view.
– Surrounding houses, code restrictions.
– Style of house to be built.
– Solar orientation, winds.
– Placement of well and septic system.
– Size and shape of the site.
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Locating the Structure on Site
• Once the location is decided on, the
structure can be drawn on the plot plan.
• There are three commonly accepted
methods of representing a house on the
plot plan:
– Lay out exterior walls and shade area.
– Draw a typical roof plan.
– Draw exterior walls thickened.
• Dimension the location of the structure
on site.
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Locating the Structure on Site
• First method of locating a structure on a plot plan is
to lay out the outside of the exterior walls, omitting all
interior walls and roof.
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Locating the Structure on Site
• Second method of locating a structure on a plot plan is
to draw the exterior walls as hidden lines and show the
roof using solid lines.
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Locating the Structure on Site
• Third method of locating a structure on a plot plan is to
show the exterior walls thickened.
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Locating the Structure on Site
• The simplest way to highlight a structure is to
crosshatch the entire building area or hatch around the
perimeter of the structure. The overall representation of
the structure should conform to the overall style of the
drawing and the other symbols used.
•
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Locating the Structure on Site
• The location of the structure on the site must be
dimensioned. Dimension the distance from a wall to
the property line.
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The Site Plan
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