**Conciseness**

Python overloads operators, that is `*` works differently for numbers or numbers and strings. You can use it to shorten some functions of yours:

    def makeSpace(num):
        return " " * 7 * num
    
    def makeFloor(num):
        return "*" * 7 * (num + 1)

**Global typo**

    white_space5 = makeSpace(Num - num2)
                             ^

That `n` should be lowercase as uppercase it refers to a global and referring to a global variable from a function is very bad.

**Use your functions**

You can use `makeSpace` once more in `render`:

    def render(num, num3):
        num2 = num - 1
        white_space7 = ""
    
        white_space = makeSpace(num)
        white_space5 = makeSpace(num - num2)
        # ...

The same goes for the top level code (that should be put in a `main` function for modularity)

    def main():
    
        Num = raw_input("Number of Stairs:" )
        Num = int(Num)
    
        white_space2 = makeSpace(Num + 1)
        print(white_space2 + "*******")
        # ...

**Variable names**

Naming the variables and arguments `num` or `num3` or `Num` is a very bad idea as it does not tell me about the meaning of what is contained inside.
 I suggest, `Num` -> `staircase_height` as an example but all the names can and should be improved.

**Avoid reassigning the same variable**

You re-assign `white_space7` and that gave me headaches when refactoring, reassigning is generally avoided in Python.

**Simplify branching**

The printing part in `render`:

    print(white_space + "      *" + white_space5 + "*")
    print(white_space + "   o  *" + white_space5 + "*")
    print(white_space + "  /|\ *" + white_space5 + "*")
    print(white_space + "  / \ *" + white_space5 + "*")
    if num3 != 0:
        print(white_space + "*******" + white_space7 + "*")
    else:
        print(white_space + "*******" + white_space5 + "*")

Extract common code out of branches. 

_and_

    for x in range(staircase_height - 1):
        render(staircase_height - x, 0)
    render(staircase_height - (x + 1), staircase_height - 1)

**Use less variables**

You can use a simple subtraction in the loop to easily avoid the `y` variable:

    for x in range(staircase_height):
        if (x < staircase_height - 1):
            render(staircase_height - x,0)
        else:
            render(staircase_height - x,staircase_height - 1)

and:

    print(makeSpace(staircase_height + 1) + ("*" * 7))

**Further simplify render**

Simply `right_pad  = makeSpace(1)`, not the long winded expression that always evaluated to one.