I live in a house of a similar era, and I think they are a bit of a challenge. I personally think that you have to go with it and embrace the boldness. It depends on your budget, but new windows would be worth considering. It needs the brown removing and replacing with something that can compete with the huge expanse of brick and I think that is probably black. There is a mid century house near us which is black and brick and it looks really smart. Black with pale render looks a bit harsh but black with brick can look balanced. The porch is the area that looks like it needs addressing the most.
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Ral 7039
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