Figuring out how much to budget for capex

[Nate Boda]

hey guys so I'm thinking about putting in an offer on a duplex in my area but am a little stumped on how much to figure in for capital expenditures. I'm using a 10% of rent number for vacancies and a 5% of rent for maintenance, however when it comes to capex I can't find any info on what that percentage should be. I know that it must depend on how old your house is (age of the roof, heater, etc) but is there a general percentage or a range that anyone uses?