Were these being done as inserts? They make a sill angle that can be used to cover that gap.

Thanks I'll have to ask them as no one at Marvin mentioned this as a possibility

If this was a wood out insert type replacement, you shouldn't be looking like you are right now. That interior side would be buried behind the stool.

these are fiberglass clad windows . my stool is flat and the window is beveled , so either have to bevel the stool to fit the window or put insome type of insert under the window

What did you take out of the home? A wood sash window?

yes and replaced with the marvin window

When I installed my Andersen inserts they came with three different sill angles to match the existing sills. It looks like Marvin doesn't have those options?

Elevate Double Hung Insert - Measuring Instruction

• For existing sill angles less than 8°, the exterior nose of the Elevate Insert sill will rest on the existing sill.
  
• It may be necessary to cover the resulting gap with trim.

Thanks

The opening should drop behind the interior stool. The window is sitting up to high for my taste. Do you have any pics of the other windows with bottom sash raised?

Actually - I think something is very wrong here. After another look at your second photo it looks like your sill is higher than your stool? That would mean that rain landing on the sill would just run into the house. And where is the inside stop - it looks like they took it out and just caulked the gap???

I agree with the most recent feedback. The windows should be sized to sit behind the stool and interior stops, not in/on top of them. If you hired someone to do this work there are some major red flags IMO.

If this was DIY, there are MANY resources that show how to properly measure and install a simple pocket window which this appears to be.

You can probably make the interior look finished by adding shoe or cove molding across the bottom to cover that gap (or all 4 sides could look better if there is room).

The way that these are installed (downsized to sit on top the stool) is done at times where there is no existing wood buck frame left, typically when a vinyl new construction window comes out.

The interior can probably be dressed up, what it the plan on the exterior though? If capping, it will appear a good bit wider than it was based on the smaller window.

Thanks , that is helpful. It was. DIY. I will add the shoe or cove molding around the interior and see how it looks. But my question is for the next few windows I install , do I bevel out the stool or do I remove it and then add it back after I put in the window. I will make the windows 1/4 inch longer so that it appears to sit behind the stool.

uhh, step 1, put the tools down. Step 2, call a professional. I can candy coat that if you want, and no, installing windows isn't brain surgery, but this is pretty well botched in every way.

I would use this trim piece and add it the top of the window inside and out and drop the window down where they should be. the window covering will hide this. You also use on the bottom without removal but it will make the frame look quite large .

https://www3.marvin.com/WebDoc/Integrity%20Frame%20Expander%20Field%20Applied%20Installation%20Instruction%2019915493.pdf