homeworking jobs? Is it better to demand it from the get-go
I doubt there's a company in the land that would recruit an unknown, straight off the street, give them a salaried post and let them work 100% from home.
For a start, there's no guarantee you wouldn't just goof around for the 6 months or so it would take for them to realise you're a lazy freeloader and then go through the process of firing you (sacking people in the UK and the rest of Europe is a long-drawn out process: employees have rights). Second, they'd have to install a load of kit in your house which would take time and you'd also have little or no "induction" into the company, your boss, the goals and culture.
So on the occasions where I have worked for places that do have home working: either as perk for trusted employees or as a cost-saving measure for the one that seriously messed up its estate management, it's not something you go "demanding" and definitely not from the start - or "get-go" in your language.
Finally, home working has many, many disadvantages. Apart from being isolated, you become an invisible part of the team - and therefore disposable. You never interact with your work-mates and never get to hear "grapevine" stuff, like where the promotion opportunities are. Neither does your boss "see" you, so you never bond and can easily get passed over for pay rises or interesting projects. Some people also find they instead of working, they spend all day with their face in the fridge and pile on the pounds.