It's funny, I used to live in an old ass 500 square feet apartment with zero soundproofing and no A/C. Now I live comfortably in a slightly bigger condo but am perpetually broke. I don't regret the choice but it sucks having to choose between having a house and having money.
My mortgage payments are probably just over 20% of my take-home pay (ie. after tax, NI and pension deductions). With utilities, factoring/maintenance fees and Council Tax (tax for local services scaled roughly by home value for you non-UKers) - it's just over 30%.
Luckily I was able to buy a place as I was paying almost the same to rent a much worse flat beforehand - one of the benefits of living outside a major city.
About a 1/6 gross. Our biggest problem is our son’s daycare is almost another 10%. But he will be in school next year and we will have our house paid off in about 3-4 years. Things should start looking up then.