Option C

None of those. Get a duct extension. That’s the proper way to do it. You can’t do the third option at all with that hood. That’s not how you do a wood hood.

Hi Sophie - The walls are concrete - this house is not in the US. Duct extension will not work. I looked into it before posting. Any reason why option C won’t work given the measurements posted? Thanks!

Of course a duct extension will work. Covering the duct to a tall ceiling is what it is designed to do.

None of those silly cabinet door kludges look like anything but kludges. But the third is the worst. It looks like someone didn’t buy the right hood insert and was determined to do a wood hood anyway. With no way to properly attach it.

Are these cabinets 18.5 inches deep like the hood, or does the hood protrude? If it protrudes, then among the choices given I would go with C, but running the backsplash design up to the soffit and moving the side cabinets away an inch or two to provide some visual "air" around the hood.

If that little wood panel at the top is covering an inadequate length duct extension, then a correctly sized one could be fabricated by a sheet metal shop.

I think we need more information to address the cabinet layout holistically.

It's ok to give exposed hoods some room on sides. I actually prefer this to give a more open look & keep the occasional heavy steam that did not get sucked up off the surrounding cabinets.

same sizes on both sides for symmetry.

Tile all the way up.

Read the stove and hood instruction manuals for suggested placement.

It also depends how much you cook, in what is the best type of hood & the spacing needed.

Here's an example, that explains why..

From Proline Range Hoods FAQ section:

"The third variable which affects the effective capture area of your range hood is the size of the hood. You can have the strongest and most powerful vent hood, with the best design, and if you don’t cover the cooktop and trap the cooking exhaust you can never get rid of it. This is especially true for range hoods over island cooktops. Once you have considered your cooking style consider the size of the range hood. Try to size the hood 6” larger in width than the cook top. Most range hoods come in 22-27” depths with some of the range hoods being 30” deep. The more coverage the better for the serious cooks. If you use your cooktop and you are serious about cooking then remember “coverage is king” especially in an island range hood setting. You can also help yourself by trying to keep your cooking over the primary capture area of your range hood. BBQ and Heavy Smoke cooking environments, both indoor and outside need coverage so size of the range hood is critical. Again, if you can catch the smoke and exhaust you can get rid of it but if you don’t “trap” or catch the smoke it is almost impossible to get rid of without removing an inefficient unnecessary amount of additional air in the room. All of which must be heated or air conditioned in most cases." http://www.prolinerangehoods.com/1-801-973-3959/support/common-questions/

Looks like I need to provide more details on the context - before we can come up with the best design - give me 1 more day - gathering some details. Will post answers to all questions and list all project constraints as well.

I'm sure we are all standing by with bated breath.