Lincle, I think Greenwood has the better idea. Bespoke dolls houses are not really for children and can be very expensive , even the kit forms can be expensive. A three year old would be far better with one that is on the website shown on Greenwoods link.
I did think it might be for yourself initially.
Humankind has not woven the web of life. We are but one thread within it. Whatever we do to the web, we do to ourselves. All things are bound together. All things connect.