Help, Architect, Interior Architect or Interior Designer?

Hi,

I want to do some renovations to a 1960’s flat roof bungulow – make a bigger kitchen, replacement windows, doors, landscaping and general tlc work. There’s plenty of space so I don’t need to add on – I just need to make better use of what’s there. I know what I like and don’t like, I’m in the graphic design business but I’d love to work with a professional specialising in this area – who do I need to talk to? All recommendations and suggestions very welcome. Thanks.