JM33 
JM44
JM66
E1600
E1640
DH37K
Fit? What to check:
Foundation height:
Base Floor Thickness
Floor-to-Ceiling height:
Overall Wall width and height
Wall overhangs Foundation
Construction style
FLAT! slideshow
Wall Cutout Wall Liner
Oscillating Saw
Jig Saw
Utility knife
Check the Stairs slideshow
Move the stairhole
New content is always being added
Q
Do I build the Extension separately?
A
I build Extensions up against the house on a very flat* table.
FLAT! Check your table! When you build a dollhouse it acquires the shape of your workbench. Then, when you move it to it's display home, it is sitting on a table with its own shape. For most dollhouses, the difference isn't much and will never be noticed, particularly dollhouses with a one-piece front where the front itself controls how straight the house is. But when an Extension is added, if the workbench sags differently from the display surface, the results can take you by surprise. And, the longer the dollhouse/extension combo, the more it will show.
I have one workbench (out of 5) that, when I pull a string side-to-side, front-to-back, and in both diagonals it shows very flat (not perfect (nothing is), but not anything I can see). I build all Dollhouse/Extension combinations on this table, the dollhouse first (check the stairs), and then the Extension up against the dollhouse. Then I know I have done my best to ensure that, if the display table is reasonably flat, the parts will line up nicely whether the customer glues them together or not.
When I don't have a flat table (like at my grandkids house) or if I can't add a layer and shim it flat, I build add-ons separately (see the note below per foundations).
A
The best fit is achieved by building the Extension up against the house so all the tiny accommodations in how the parts glue to each other are constantly being fit to the house (see FLAT above!)...
... but the most important moment in the assembly for a perfect fit is when gluing the Extension body to the foundation.
An Extension can be glued to the house along the way (easiest, but might make moving it after assembly difficult), or after all the construction is done (long bands of tape wrapped all the way around the house and extension multiple times), or not glued at all.
(see "Wall Cutout" at left)
A
