I'm aware of at least two attempts by others to draw a floor plan: One is in a book of blueprints of various fictional TV houses; the other is an online picture that I found by browsing the web. Both versions arrive at solutions that ignore many clues given during the episodes of the DVD Show. One of them even contains numerous blatant discrepancies that conflict with what is plainly seen on the show. So I decided to try my own solution.
The main problem is the part of the house containing the den (or guest room) and Richie's room. Here's what we know about the rooms:
Richie's room -- From "The Man From My Uncle", we know that Richie's room:
(a) has a window facing the house across the street
(b) is reached by a hallway, and is entered by approaching from the left of the hall, as seen from inside the room.
Item (a) is no problem; that would position the room to the left of the den, as seen from the living room; and that fits with the wall that can be seen through the open front door of the house. But item (b) is a real problem. How can you go past the den, enter from the hall on the correct side, and be at the front of the house -- unless the layout is something like this:
It's a layout that makes no sense. No architect would design a hallway that wraps completely around a room, as this hall wraps around the den. Yet this layout seems to be required in order to make everything fit together as shown on the program.
Then I figured out a possible solution. What if the Petrie home were situated inside a curve on Bonnie Meadow Road? There is such a location on that street.
In that case there would be multiple houses, in different directions, visible from rooms in the house -- like this:
Now everything falls into place. Richie's room is located like this:
Richie's bedroom window still looks out across the street -- but at a 90-degree angle from the front door. The den is not surrounded by the hallway, but instead has exterior walls with windows on one or even two walls of the room.
The rest of the house is fairly easy to lay out. The following drawing is certainly not to scale; distances and angles are too hard to determine on a 2-D television screen. Green areas are those we see on the show; yellow areas are never seen, and therefore are purely speculative on my part.
I've left out the positioning of the basement, and the stairs to the basement. You can only go so far with a project like this...
1 - Front Door
2 - Coat closet
3 - Den (the little wall inside the door is awkwardly placed. Perhaps it's a structural element -- maybe made necessary by the boulder in the basement?)
4 - Step up/down
5 - Bay window
6 - wood stove on brick hearth
7 - Pass through window to kitchen
8 - Ottoman
9 - Piano (usually seen only at parties; once seen against this wall of the room)
10 - Kitchen
11 - Broom closet
12 - Sliding glass doors
13 - Laundry room (never seen but once mentioned; this seems like a logical location)
14 - Garage (orienting the garage in this way makes sense if the street curves around the house as I've speculated)
15 - Wood deck (I've assumed the arms of the U shape; it would explain why the Helpers don't come in straight from outside the sliding door, and also gives a location for the grill (16) that was implied in that location in one episode.
17 - Master bedroom. I've drawn it as a trapezoid instead of a rectangle, as a close observation of the room while watching the show reveals an angle > 90 degrees between the wall with the window, and the wall the beds are against.
18 - Master bath
19 - Hall to Richie's room
20 -Richie's room
21 - Bath
22 - Window used by G-Man for stakeout
23 - Driveway
24 - To Millie and Jerry's house
25 - Bonnie Meadow Road