This is whereby the architect designs the house in such a manner that the house occupants can continue adding more rooms in future as their needs increase.
The house starts with 1 bedroom which can easily be added to become 2 bedroomed ,3 bedroomed and 4 bedroomed.
See
http://www.a4architect.c...ial-house-construction/
for more information.
As the family size grows, the house also grows concurrently.
This architectural design aids greatly in planning for the future.
As Iron Sharpens Iron, So one Man Sharpens Another.