The Unreal team has recently shared a new Archviz Interior Rendering sample project.

You can now explore a small apartment scene and test a variety of scenarios to learn some techniques and then reuse elements in your own scenes.

First, you'll learn about dynamic soft shadows from area lights, how to capture fine details and mimic real shadows. You'll also explore how ray-traced reflections lend credibility by including off-screen elements.

Please note that in order to use ray tracing features in Unreal Engine, you’ll need a high-end desktop system equipped with a ray-tracing-capable graphics card. 

Learn more about the scene here.