Is it legal to have a bouble sided deadbolt lock on a front door of a up stairs apartment?

Answer:
No, safety fire issue.

---

It depends on the housing laws of your city and state. I personally do not like the idea of having to have a key to get out of my own apartment.

---

Many people would have this I'm sure, if you can keep a spare key in the lock incase of a fire I don't see a problem, as long as the key is ALWAYS there. That way if there is a fire you don't have to stress about FINDING the keys then crawling to the front door, then (panicing by now), trying to get the key into the lock without suffocating. The key is already there, you just crawl, unlock, and run!

---

No.

---

Fire codes generally prohibit such a lock on an exit. Such codes do vary by jurisdiction however.