Not to be a Debbie downer but Tody already handles home maintenance tracking, and it's already close to perfect IMO. What does your app offer that Tody doesn't? I can't download it because it's iOS only.
Dismissing it as "built for stuff that gets dirty again, like vacuuming and counters" just means you didn't even look at it. Saying it doesn't support "only nagging you about gutters in the right season" is a lie, it absolutely supports that. I use it to schedule household tasks exactly as you describe, and even personal tasks like applying night cream (every 3 days) and doing my hair treatment (every 60 days).
You can also easily track multiple properties, just set each property is an "area."
I don't know why you can't just say "I'm building it because I want to build something" instead of pretending that the thing you're building doesn't already exist.