Theater Design Company designs, sells, installs and services high-performance audio, video and lighting systems, mainly for homes: private theaters, whole-home AV, TV installs with concealed cabling, lighting control and architectural downlights. It is based in the Seattle–Tacoma area with a showroom open by appointment, and says it serves all of Washington, with consulting and installation farther afield.
For whole-home control it says RTI and Josh.ai are typical, with lighting, shades, audio, video, climate and security on one interface, and it installs Nexus 21 motorized TV, projector and appliance lifts. Its products page names Lutron RA3 and HomeWorks lighting systems, motorized shades and drapery, Sony, DMF and other lighting lines, and eero mesh Wi-Fi.