Thank you for your detailed response.
We have a neibour like you, I overheard him maoning to his wife one sat a couple of years ago bout not able to have a cup of tea in quite. It was a sunny Saturday about 11.am. Me and my OH thought, WTH, shut the ... up.
We put it down to envy as we have nice cars a better looking place than theirs and we are the only Asains in the road, I may be wrong.
Another point, people go to work, we did until we left work just over the age of 50. When we worked, we'd only have time when back home and after diner and started work around 18-00hrs and finished by 21-30-ish and then it was the weekend
As I said, be pleased they are keeping a nice property. Alternatively move and buy a house with a much larger garden
Live and let live is what we say and if next door is doing well and making the street look better, great
If they are working outside hours as allowed by the council then report them but from your thread I don't believe they are
I hope their work comes to an end soon and you can have quiet times in your garden.