You’ll need a bathroom of course. Here’s how we built one with no rough in and without breaking the concrete: https://www.frugalfamilytimes.com/2017/12/how-to-install-basement-bathroom-or-anywhere-without-major-construction-saniflo.html?m=1
Hi Manda, here's a great checklist of things to do when converting your garage into an apartment - https://www.alansfactoryoutlet.com/how-to-turn-a-garage-into-an-apartment Hope it helps
You will have to get planning permission from your local Authority to do that and also Building Regulations. Do contact them first, before you start, because if you don't it could cost you dear and be a waste of money. Alternatively call in a local Builder that will have had experience of Garage conversions and ask him for his opinions..........
Thank you very much. I will do it first.
Manda, That's a huge question so let me give you a quick list of things for you to research:
Suggest you look at current cost vs value remodeling data to get a realistic idea of what things will cost, starting here ... and good luck.