Yes — wireless systems can be added without wall demolition. Lutron Caseta (lighting control, no neutral required), Sonos (multi-zone audio, wireless), Ecobee or Nest (smart thermostats), Ring or Nest (video doorbells and cameras), and smart locks (August, Schlage Encode) can all be installed in a finished home without opening walls. Hardwired systems — Lutron RadioRA 3 (requires a neutral at switches), in-ceiling speakers (require speaker wire), and structured network wiring (requires CAT6 to AP locations) — require wire runs through finished walls, which involves drywall patching. RainFire Builders recommends wireless-first for retrofit projects and taking advantage of any open-wall window during renovation to install hardwired infrastructure that would otherwise require expensive retrofit installation.