I'm 28 but until I move to the UK from California I'll have lived with my parents my whole life. It took me a while to find some good success but it happened.
I've got zero experience with this stuff. I've never even paid rent.
My first suggestion-- If you don't know already, learn how to cook. If it's something your parents have always done for you all these years, maybe it would be a good idea to test a few favourite recipes before moving, so when you're missing a bit of home, you can fix those dishes for yourself
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Second- rent and travel are expensive. I certainly agree with respect to houseshares if you're a single guy moving over, as it is highly probable that you will want to meet people outside of work to socialise with. Check out
SpareRoom for an idea of what's available. I know rent can be shocking, but as you go further outside of London to find lower rent costs, the travel cost (and commute times) can also increase rapidly-- so it's important to consider these various factors together to find a balance that suits you. The
TFL website will give you an idea of commute/journey times.
If you're looking for a bit of personal commentary-- My partner and I make a similar amount to your expected earnings (except without the additional %). We live in a nice area of London (N5) and for rent and bills, we pay around £1,500/month. Our combined travel is another £420/month on top of that, and each of us commutes around 1 hr 20 mins to work. Our groceries are variable, but average out to around £30/week. We go out for dinner at least weekly (£30-40), and try to make trips to Europe every few months (£400). I pay $500/month in US student loans, and am able to put away £250/month into a savings account. He's not in the habit of saving, but buys new gadgets and video games regularly. I feel like we live a moderately good life, so depending on your own personal preferences/spending habits, it certainly is doable. As you've only got one mouth to feed, and one commute to cover-- I think you'll be that much better off-- especially if opting for a house share!