Host of Million Dollar Contractor on DIY Network and HGTV, Stephen Fanuka frequently works with leading architects and designers as a contractor on high-end projects. His attention to detail comes from years of training as a master craftsman. Last week, Fanuka guided participants of Cadillac’s Driven by Design, an event co-sponsored by Architectural Digest, through a Chelsea townhouse he recently renovated. After the tour, Fanuka shared some tips for renovations with the editors of AD.

What is the first thing you change in a room?

Moldings make a huge difference. Add a chair rail, crown, or new base molding. Take a flat door and apply panel molding to make it look like a recessed paneled door. You can also change the knobs and hinges on your doors to finished metal to give them a more polished look.

Is there a particular type of molding you recommend?

If you want to keep your crown molding looking crisp, use ones made of resin or Styrofoam instead of wood. Wood breathes; it expands and contracts. That’s why you see cracking where the molding meets the ceiling and walls. Resin and Styrofoam moldings don’t move. The goal here is to keep it looking good for years.

Are there any physical tricks for making a small room feel more spacious?

I love pocket doors. They help you avoid hitting pieces of furniture. And a tight room feels bigger when you don’t see the doors. You can paint the upper sleeve that hides the track black to create a shadow effect.

Any advice for people who want a big change without a complete renovation?

Look up at your ceiling. The ceiling is the fifth wall. Add a pop of color or hang wallpaper.