Repairing rotten windows

Seems everything I look at in this holiday house has rotted. This window frame is cedar but the front part was completely crumbly so I cut it off and was planning to simply screw another piece on front, after putting some wood hardener in the gaps and filling with bog.

Open to other suggestions, I have just replaced the weatherboards and don’t want to pull the windows out and I don’t think it’s feasible to replace the whole bottom piece?

The last photo is of one of the windows that doesn’t have much rot, for context.

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Sorry to say but it looks like it has gone too far and complete replacement of the bottom sill is the only option in my opinion.

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Originally Posted by droog

Sorry to say but it looks like it has gone too far and complete replacement of the bottom sill is the only option in my opinion.

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Do you think it’s feasible to do that without removing the full window, eg just taking out the two bottom glass panels?

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Originally Posted by kevviek

Do you think it’s feasible to do that without removing the full window, eg just taking out the two bottom glass panels?

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Without first hand examination it’s impossible to say, but may be possible depending on construction.

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Originally Posted by kevviek

Do you think it’s feasible to do that without removing the full window, eg just taking out the two bottom glass panels?

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Probably.

I have had to make this exact same repair, on multiple windows on a previous house. I also had to replace the bottom 30cm of the sides on a couple of the windows, and this was on the top story of that house. At least you are nearly at ground level.

I don't have any photos though. This was pre-digital photography.