If you have a garden you can have an extension.
If you have an empty attic you can have a loft conversion.
If you have high ceilings you can put in a mezzanine.
If you live in a flat on an upper floor you have to knock a hole through to the neighbours flat and take it over by force.. ;-)
Post or PM some more details about what you are thinking about (size, budget etc) and I can probably point you in the right direction
Making small houses bigger:
If you have a garden you can have an extension.
If you have an empty attic you can have a loft conversion.
If you have high ceilings you can put in a mezzanine.
If you live in a flat on an upper floor you have to knock a hole through to the neighbours flat and take it over by force.. ;-)
Post or PM some more details about what you are thinking about (size, budget etc) and I can probably point you in the right direction