To plant trees to block neighbours extension windows

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Neighbour built a ground floor extension, has built to nearly 4m with flat roof, and put in windows above my 2m fence. They are not even opaque glass. Their superhighway LED lighting
I d

Posted to soon. Lights up my garden.

AIBU to plant pleached trees to block them? It's planting season.

If its in your garden and it's to give you privacy I'd say crack on!

Check with council about planning, they may have to knock it down if they didn’t get permission. If they did, you kissed your chance to object to their new view of your garden.

Trees are fine. Conifers can be quick growers.

So the windows are at the side of the extension not just at the back? Were you not given the opportunity to object to the plans during the planning process?

Why not? They obviously don't care about your comfort.

It sounds like permitted development so no planning needed.

At 2m at least they won't be looking into your garden but you're perfectly entitled to plant trees if you like.

Yes to permitted development and side windows. We can look right into their seating area out of our 1st floor windows. It's very odd after previous privacy. I did object to the neighbour and planning but they went ahead.