Aside from the cracks issue:
Your pics show an air brick just below ground level thats blocked with soil.
Clean out that air brick - and then search and find and clean out all the air bricks around the house.
The ground level should be below the air bricks - and 150mm below the DPC.
I cant see the DPC line - perhaps its behind the black cable?
There's a very thick mortar bed just above the air brick.
Someone had miscalculated when setting out - its bad practice to have such thick mortar beds but the bed doesn't show any signs of instability or pressure.
Your cavity wall appears to have been injected with Cavity Wall Insulation - presumably the whole house was injected with CWI?
FWIW: your neighbour has the same replacement window frames - do they have any crack issues?
I doubt that you are wasting heat.
Hi Vinn,
Thanks for your reply. There's nothing behind the black cable. I thought the thick mortar above the air brick was where the dpc was?
I'm really confused how you knew the cavity wall had been done but yes I think the whole house. However when we first moved in we were hounded by companies wanting to do CWI for us as apparently it showed on a national register as not being done and they didn't believe us that it had. The previous owner was very hands on and his sons were builders so if they did it themselves or not we don't know. They built the garage (with asbestos roof), conservatory (without permission), all the fitted wardrobes, hung every photo with huge nails which has left us with holes and crumbling plaster in most walls and the stupid thing for the pond pump which I'll post in a minute...
As far as I'm aware she hasn't got any issues with cracks that we can obviously see from our side. But then ours aren't easy to see unless you're looking for them. Her pointing is much better and more recent so I don't know if that has made a difference.
We were told in the survey that the dpc was bridged and I was going to post a new thread in relation to this but since you're here I'll pick your brains if you don't mind... It said bridged but didn't say where. But basically could be any of the following (all pictured)... The conservatory, stupid pond thing which seems to have its only blood foundations! or decking... or like you said just the ground in general.
Because of all this I wouldn't know where any other airbricks are. There's one on the inside of the dining room (other side where the chimney breast is on the gable end) not sure if it goes into the chimney breast but it had been blocked up for a long time. We had that wall replastered because there was water dripping down it and have left it open and the wall seems to have stayed dry since. Again not shown in the survey. The building next to the decking with the hose on is an external utility joined to the back of the house with no access inside.
The white door which looks like there's dpc showing or i'm assuming that's what the black thing is and where the dog is standing next to is the conservatory and how it joins to the house.
Sorry I know the photos look a mess. It's all getting removed but we're getting there slowly one step at a time!
Thanks again.