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Crumbling wall around raised lawn.
Hi, I am new to the site and forum and a complete beginner in the garden so apologies in advance.
The house we have purchased has a small wall around our raised lawn and it has started to crumble. With 2 children under 9 it is quite dangerous. The lawn is currently shaped, I hope the pictures have attached. We would like to make the lawn straight across.
We like the idea of taking the wall out completely and then putting in sleepers or a more modern wall with beds.
1st problem is I do not know where to start and what I would have to do. 2nd problem is I know we have a metal manhole that the previous owners covered in soil. The bad weather has uncovered this.
My apologies if this is not the right place to ask for advice but is this something a novice could take on and are there any previous posts that could help me with complete instructions about depth for walls etc

The house we have purchased has a small wall around our raised lawn and it has started to crumble. With 2 children under 9 it is quite dangerous. The lawn is currently shaped, I hope the pictures have attached. We would like to make the lawn straight across.
We like the idea of taking the wall out completely and then putting in sleepers or a more modern wall with beds.
1st problem is I do not know where to start and what I would have to do. 2nd problem is I know we have a metal manhole that the previous owners covered in soil. The bad weather has uncovered this.
My apologies if this is not the right place to ask for advice but is this something a novice could take on and are there any previous posts that could help me with complete instructions about depth for walls etc

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Posts
Mark your chosen size on the ground with a hose or string between canes so you can see what's what. If the lawn is going to be smaller, also bear in mind you may not be able to buy matching slabs. You may want to fill the paving gaps if you have some with brick paving using the bricks from the demolished wall.
Once you are happy, set to and demolish the wall and dig out the founds. I don't think the founds will be all that substantial. You will probably need a mini skip to put the bricks in.
Then dig out any soil which is on the 'wrong' side of your line. Still happy with shape & size? Lay sleepers - two sleepers high will do and they can be laid either on tamped down soil or dig out a six inch deep trench, fill with gravel or your old bricks as long as they are level. Lay your sleepers making sure any joins overlap. I don't think the sleepers will 'move' but you could screw them into posts knocked in at the back of them. Use the biggest sleepers you can get - 10 inch x 5 inch will do.
Fill any gaps with soil, repair/replace damaged paving/gaps.
Job done!
Man hole cover - clean and sit a pot on it or grow something sprawl over it like a spreading juniper.