I bought my flat outright just over three years ago and it was the best thing I ever did workwise; I saved virtually all of what I needed, took a smallish bank loan for the rest and then transferred most of that to an interest free money transfer card by drawing what I needed to pay the loan off. I have a tiny amount to pay off the card, but since it's still interest free until May it hasn't cost me a penny extra
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It's risky - it's extremely unlikely that you'll find a freehold flat which means you'll be in breach of your lease by working from it, and if you have any problems it's not as simple as just giving notice and bogging off. It's vital that you find the right place and don't just pick one because it's nice and within your budget, but if you choose well you'll save a fortune and my incall overheads don't even amount to a one hour booking a week.
The most important thing to know would be that you will need far more money than you think you will; solicitors fees and admin stuff obviously, but don't underestimate the cost of furnishing an empty flat even just enough to make it workable. Mine also needed some plastering and minor repairs, plus I had to replace the boiler because it was ancient and the hot water wasn't reliable. I did the decorating myself and ordered virtually all the furniture from IKEA but I still had to buy a washerdryer, kitchen appliances and towels/linen as well as all the small stuff like toiletries, crockery, lamps, basic food for the cupboards, curtains, waste bins, mirrors - the list literally goes on for ever. And it still isn't finished
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Also know that it takes longer and involves more frustration and pissing about than you can ever plan for - I lost two weeks I could have been working because the silly twat I bought mine from forgot to book a day off work to move (they were supposed to have vacated a month earlier - this sort of thing happens all the time). The whole process from me putting an offer in to actually getting the keys took three and a half months, and given that I didn't have to get the money from anywhere I was pretty bloody quick.