I have a large concrete base at the bottom of my garden which is approx 40m2. I would like to build an outbuilding made of bricks at the side and breeze blocks at the front and back. I would also like to build a cavity wall to ensure the building is well insulated. 

 

When looking at picture IMG_8756 on the right hand side the neighbours garden drops down significantly as can be seen in IMG_8758. There is a small single wall that has started to lean to one side. 

 

How would be the best way to deal with this? Would you recommend removing the single wall that is leaning over and replacing with a retaining wall? 

 

I would appreciate any advice. Also happy to provide more details if needed.

I would pull the whole thing out and start again if you are looking a decent building. For a free standing timber shed then it would be fine but last thing you want is foundation failure, cracked walls etc.

Thanks for your reply markc. 

 

Thanks for the advice. I definitely don't want any issues at a later date. 

 

So what would your advice be regarding the neighbours garden on the right hand side that drops down. Recommend a retaining wall?

If you are going to take out that base and put new foundations in can you not just leave the ground level down at the same level as the neighbours ?

 

As above or keep new base at the higher level put not fill on neighbours side so nothing can move

I have a feel that the concrete base in the photo is quite deep as I believe the previous owner used to fix cars and he built two vehicle inspection pits. You can still see them when you stand on the concrete but they have just been filled in now.