Freshly updated, 100 year old brick house on a hill with double paned windows, and security cameras all sides. I will open fire from a perched position before the first idiot reaches my doorstep.

Fire code has guidelines for storage of bulk smokeless powder (an excess of 50 lbs). Long story short, build a wooden box with minimum 1" thick wooden sides and nail shut. Use only nails to fasten or some other "loose" method that allows gaps in the wood. Do not alter in any way that would create a seal or else you essentially are turning that box into a explody boomy. You want that box to be able to controlled vent if the contents inside were to ever catch fire.

Also keep in mind best locations in the home to store these items. Closets burn hotter in a house fire. Close to basement foundation walls will generally be the best protected from heat. The purpose of the wood box above is to buy time before the heat of the fire reaches the contents inside. A typical wood stud interior partition has a fire rating close to 1hr. I imagine a solid 1" of lumber might be closer to 1-1/2 to 2 hr. Resistance.

You can store lots of powder in this fashion so long as it's max 50lbs per box. I think once you have a few hundred lbs, you're then considered a "battery" which has a slew of other requirements.

Interestingly enough, I have never found any guidelines for the storage of primers or fully manufactured ammo. Only thing I have found is that primer storage is limited to 10k primers per building/residence (lol). I suppose primers would pose less danger due to their package and only creating small & localized detonations like little fire crackers. Never take primers out of their packaging and dump them into a jar or other vessel, otherwise they might make a bigger boom. Same thoughts with ammo. When ammo detonates outside of a chamber, it is not much more dangerous then a fire cracker.

All of this info is per the fire code. Which you could honestly just decide to ignore most likely and never get caught as a private home owner. However, I recommend to try to adhere to those guidelines for the safety of any fire responders unlucky enough to enter the burning home of a reloader.