Soldato
Your calculations are broadly fine, but what happens over the next 1800 days remains to be seen.
What if you break up and are a forced seller in a down market? What if they decide to adopt universal basic income and everybody gets money meaning the housing market booms? What if they put a flight path over your house? What about if you have Japanese knotweed which costs a tonne to put right? What if you decide to get a homebuyers survey and then find the property has structural damage that wasn't in the survey? What if it's on a flood prone area? What if you have some inheritance? What happens if you have more children and need a bigger property? What if a family member falls poorly and you need to move to support them?
The reason I say these things is the debate about "rent Vs buy" is not as straightforward as which is the best decision financially. If you rented and some of the above happened, you'd be glad you could get out quickly. On the other hand, if the next 5 years play out perfectly as planned, except you rented, you'd be financially worse off.
It's sensible to give thought to the housing situation in the country, but the sums you are doing almost never work out the way you would predict. This comes from the minute you choose to buy: there are things which will cost more than you expect, and others less.
This is the implicit unpredictably of big life decisions, and it should be this way! If everything went exactly as imagined, how boring!
Some of them are a bit meh but get your point, flight path is area dependent and isnt done on a whim, only OP knows if that is remotely possible
Japanese knotweed, its not that much in real terms its time consuming
Survey, a decent survey should pick it up, and if not thats why you buy house insurance, which will already know if its likely an issue from during the buying process
Flood area, likewise part of buying
Inheritance, impossible to plan for
More children (there are ways to avoid this )
Some of the contra points, what if no house price crash comes
What if your landlord decides to put up your rent dramatically
What happens if your landlord decides to sell and gives you notice
What happens if your landlord doesnt fix things properly when you have issues such as damp or a dodgy boiler etc
Can you do what you want to the house as a tenant, for the majority you cant, and for a lot of things you would be daft to anyway. For me when i rented this was seriously annoying, having to put up with things
There are pluses and minus in all things, benefits under some circumstances are negatives under others.
For most the difference in owning or renting is dramatic. Whilst the financial impact may not be high over 5 years, once you start getting into the 10, 15, 20 year horizon the difference can become massive.
There is going to be a real wave of pensioner poverty when the declining ownership group start to ripple into retirement, for many there probably wont be a retirement, they will need to work to pay rent.