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With costs as they are, I wouldn’t extend unless it was absolutely essential. Google utility cupboards, with very little space you can make a great, useful space, and a wc under the stairs perhaps? Glass doors to garden sounds like a wonderful idea.
I used a kitchen designer who can also do interior design to plan my downstairs layout as I was at a bit of a loss how to get what I wanted, I knew an architect was not gon a help me plan the actual space/furniture/etc. It’s been invaluable, she created exactly what I thought I could see but couldn’t create, and saved me loads of money in not doing structural stuff I thought we had no option but to do.