Dave in Gig Harbor, WA (just south of Seattle) says:
Here's a 750 sq ft home I shot with a 24mm. If this doesn't prove that all those zoom-wide lens aren't needed I give up. I literally never go any wider than 24mm these days (often 50mm). The 24mm TS-E hasn't been off my camera in 6 months (I do have another camera for longer lenses). I've have some of my clients actually call me--to make fun of a new listing on the Hot Sheet, and how wide it's been shot... People are starting to get it!
I was actually trained to shoot real estate with a 24mm prime! When I started shooting my wife's listings in around 2000, all we had was a 24mm prime for our Nikon 6006 film DSLR. We thought this was the top lens choice for interior photography, and used it for all her listings for many years. When I got a Canon 5DMKII and a 16-35mm zoom, the first listing I shot for her using the 16-35mm, I racked it out to 16mm for the whole thing. I'd never even seen images at 16mm and thought they were really cool! When I showed her the images, she went ballistic and sent me back to reshoot the listing at 24mm. From then on, every time I got below 24mm, she would complain the image looked like a bowling alley!