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© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only

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PublisherThe Goodheart-Willcox Co., Inc.Tinley Park, Illinois

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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.– 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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• 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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• 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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• 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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• Third method of locating a structure on a plot plan is to show the exterior walls thickened.

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• 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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• 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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