My 18 month old daughter loves her new house. Have the main house in the garden and the extension in our house which is being used as a separate play house in her room. Main house is very study and providing hours of play. The extension seems a bit flimsy for outside use, but inside no issues.
Whilst getting to this stage wasn't the easiest due to the first house being delivered with missing parts, we finally got there and the look on my nieces face once in the house says it all - she loves it