No chimney? Where is his forge?
Is he a toolsmith, a weapon maker, or a farrier? It's important to know whether he is tempering the steel or just forging it.
If he is tempering, he needs to control the light where they are working, to see the temper of the steel. Most blacksmith shops I've been in have been dim, just one or two small windows, not open areas that the sun can get in.
Look through the Abana site, http://www.abana.org/
They might have some shots of contemporary blacksmiths shops, the layout and tooling won't be much different from medieval ones. (except the new ones have drop hammers and fancier anvils, and some use gas forges)
It also seems larger than necessary, unless he's making weapons and needs to keep them locked up inside. And the grounds are too clean, there should be lots of scrap metal, half-finished projects, old benches, and other junk piled up outside.