How to Draw Blueprints for a House
For the perimeter, use a pencil to draw the outside walls of the house. Try to take up the whole grid paper to get a larger scale.
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    The next step is to draw the inside walls, using the same style as the outer walls. Don't forget to include all rooms needed for a house. A room many people forget is a utility room where you keep your heater, washer, dryer, water filter, etc.
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    Start drawing the doors and windows. With the walls complete the next step is to add doors and windows. Window size and door sizes can vary. For example the front door will probably be a bit bigger than the door to the closet.
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    Find templates to draw the Utilities. This is where you get into detail. The house needs sinks, toilets, bathtub, cabinets, stove and a fridge. There are templates that can help draw these. Without a template, just draw the basic shape of a sky view of these utilities. There does not need to be much detail, just enough to tell what each utility is.
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    To get an idea of the final result and layout, try drawing in the furniture. This step is optional but it is nice to get an idea of what the house will look like. Some examples of furniture one could use is beds, televisions, couches, chairs and tables. There is a template for this also and you draw these like with the utilities. Keep it simple and try to make everything square or rectangle to stay with the grid paper.
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    Start working on the Yard. There is not much to add to the yard until the next step. What can be added is a porch or draw out lines for a driveway. The porch is not like the walls because you only need one line. The porch doesn't have thickness like the walls do.
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    Use the black sharpie for labeling. In each room write what each room is. One might need to abbreviate rooms like a closet where only CL can fit in the room. Also write everything in capital letters to make it easier to read. To finish up with the black sharpie, go over all of your pencil marks. Using a colored marker, color in the furniture and utilities but make cabinets a brown color. The porch can be brown or gray depending on if the porch is made of wood or cement. Green can be added around the house for grass. Blue is a good color to shade in for the windows and the walls can be black or gray.
    http://www.carnationconstruction.com/Techniques/009-Techniques-Blueprints.html