Not unless you are complying to escape regulations or wish to comply with toughened glass criteria.
It is important that you try and achieve a continuous 2100mm window/door HEAD height when setting out any building. Apart from aesthetics, this height setting allows a comfortable opening height for top openers, cleaning etc.
I've put the lintel level with the next window but haven't managed to decide where to finish the bottom of it.
The box room is too high at the bottom and the bay too low. I'm thinking of going a brick or 2 higher than the bay and hoping the porch masks the difference.
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