Is this subsidence?

[lovenaturelovelife]

This is where new extension join the old part of the house. cracks are wider at the top and at the bottom of the wall very fine hairline cracks in the bricks itself.

I'd say so, yes, unless the extension is very new and these are settlement cracks but it looks like the new bit is pulling away from the old bit possibly to do with a difference in depth of foundations. It could be that the older bit actually has a shallower foundation and so seasonal movement is different from one to the other. Don't panic, our old house had this, well actually a massive crack in on both sides of an adjoining wall. It was stapled and glued - no problem at all. Get a structural engineer to look at it.

@Stonefromthehenge Thank you ,extension was added prior to house purchase in 2000. House itself is built between 80 to 90s.

Hi. The cracking looks to be very minor. Probably some minor initial settlement or minor differential movement between the older and newer structures. I would point it up and monitor for re-opening. Unless you have wide, diagonal cracking internal and externally, some of which extends to ground level, I wouldn't worry about subsidence.

No i would not say it follows the pattern of a substance crack. It is just where the old meets new and dries out.
Subsidence cracks tend to follow a slanted angle above /below load bearing areas and often cause bricks to break and crack. Any chartered surveyor will tell you that. You don’t need a structural engineer to do so!

Hiya, sorry this is an old post so I'm hoping you might still follow. We have a very similar problem with our extension/old house gap and we were wondering if you had it looked at and what it was in the end? Our extension is about 25 years old as well. We have cracks in the plaster inside too.