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How to read house construction plans

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Explained below are 5 types of construction plans: floor plans, site plans, sub-floor plans, elevations and sections. Two types of interaction are available on this web page: 'magnify' and 'fully interactive'. Read the explanation and instructions below for more specific information.

Plan 1: Floor plan

A floor plan is an overhead view of the completed house (with the roof removed). You'll see parallel lines that scale at whatever width the walls are required to be. Dimensions are usually drawn between the walls to specify room sizes and wall lengths. Floor plans will also include details of fixtures like sinks, water heaters, furnaces, etc. Floor plans will include notes to specify finishes, construction, methods or symbols for electrical items.

Interactive floor plan Click button to see an interactive version of the floor plan.

Move the cursor (or finger on iPad) over the floor plan below to magnify it.

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Plan 2: Site plan

Site plans are drawn to show the location of a building on the land that it will be built on. It is an overhead view of the construction site and the building as it sits in reference to the boundries of the lot. Site plans should outline location of utility services, retaining walls, setback requirements, easements, fences, location of driveways and walkways, and sometimes even topographical data that specifies the slope of the terrain.

Interactive site plan Click to see interactive version of plan.

Move the cursor (or finger on iPad) over the site plan below to magnify it.

Plan 3: Sub-floor Plan

The sub-floor plan gives details of how this area will be constructed and how services will be arranged.

Interactive sub-floor plan Click to see interactive version of plan.

Move the cursor over the sub-floor plan below to magnify it.

Plan 4: Elevations

Elevations are a non-perspective view of the house. These are drawn to scale so that measurements can be taken for any aspect necessary. Plans include front, rear and both side elevations. The elevations specify ridge heights, the positioning of the final fall of the land, exterior finishes, roof pitches, fence locations and other details that are necessary to give the house its exterior architectural styling.

Elevation Click to see interactive version of plan.

Move the cursor over the elevation plan below to magnify it.

Plan 5: Section

A section cuts through the dwelling and the location of this 'cut through' is noted on the floor plan. It describes how the building will be constructed and discusses how the internal finishes are to look. Sections are used because they explain certain conditions in more detail.

Interactive section plan Click to see interactive version of plan.

Move the cursor over the section plan to magnify it.

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