I personally don't like a sink in the island... you will always have something dirty in the sink on the coutertop. Three stools at the island, 4 will be crowded.

Why not add cabinetry around perimeter and have a table and chairs rather than seating up to an island? What will the sunroom be used for? Why not incorporate it into the Breakfast area with a coffe bar, dining and conversation area? Is it 4 season or un-conditioned space?

This looks like a poorly planned addition with new space in red.

What's off to the right that's not shown?

What about the space outlined in blue?

Showing the entire plan will help.

Two islands are one too many. Obstacle not a help. Balance of the dimensions will greatly help us help you.

As above, it would be great to see all dimensions (for example, the aisles look tight between the islands and the cook wall) and to know what's beyond the doorways at the right. Also please let us know what your goals are for the renovation (more seating, better function, etc.)

If that's the refrigerator on the bottom wall, separated from the sink by an island and several steps, it's not at all handy to the kitchen proper.

I'd much prefer an L shape kitchen with a single island, probably parallel to the cook wall. But people can help you with a better layout when we know goals, dimensions and adjoining spaces.

Looks decent. But, I guess you can plan better than this.

Not "decent"

You have nowhere enough context to get help. What is the current condition and all the dimensions. Add pictures.

How many cooks, kids? What of the proposed appliances, which appears to be at least a 48 inch range needing proper venting and make up air?

What is the outlined blue area now, and what is the intent for the blue area?

Show the entire living floor. To plan a kitchen, every single dimension of walls, windows, appliances, passages, must be noted.

How you cook, what you cook, one or TWO cooks , how you entertain....all are context you provide, to get meaningful suggestions.

I much prefer the long side of one large island facing the range. Think practically where you are going to prep food in the current layout. The most valuable prep space is next to a water source.

I also hate a cleanup sink on the island, mess on display at all times, no thanks.

My suggestions: I would be moving the range "down" on its wall, then putting the DW and cleanup sink right at the top (DW does not go between range and sink). I would put drawers for dishes in the island facing the DW for ease of putting away.

I would then put a prep sink at the very bottom right cover of the island. You then have a nice spacious prep sink directly across from the range and fridge.

I would also put a pantry cabinet in between the fridge and wall, and maybe on the other side of the fridge too. Alternatively, you could have standard upper-lower-countertop on the left side of the fridge and place the MW there. We put a MW on an open shelf of an upper cabinet right next to the fridge since most things that go into the MW come out of the fridge.

The drawing is hard to get a handle on, spatial estimating and flow is difficult to envision without seeing more of the house to understand furniture and room layout. If you only want an answer about clearance between islands or a stove, that is a recommended dimension as commented, but for advice on how to make the kitchen better there is a lot of unknown info.

The structure seems to not have been fully addressed yet or a lack of information makes it unclear, but it is very consequential to your kitchen design. For instance, an assumption is the red dashed line is the existing back wall of house, that has a bay Breakfast Area, and with a cantilevered 2nd floor (as PPF graphically commented). With that, the entire 26'-0" back wall is to be removed, and a beam is placed also eliminating the cantilever. That beam would be astronomically (a technical engineering term lol) large for a 26' span holding up a second floor and an addition's roof, so without very complicated detailing, the beam would have a soffit splicing your kitchen into two rooms, right over where you stand at the sink, and there is also the 10'x26' open area next to the kitchen split in two rooms.