Garden wall affected by tree

Hi there, You'd need either a landscaper or builder. The damaged wall will need rebuilding. Also, a 200mm wide strip along the back of the wall should be dug out down to foundation level alongside the tree, with the roots chopped back. Install a vertical root barrier along the back of the trench and backfill with gravel between the barrier and wall. You can top off the gravel with a layer of topsoil if you like. Hope that helps

The situation you've described involves a retaining wall that is under pressure from both soil and tree roots. Since the wall is cracked and leaning, it is likely structurally compromised.Recommended StepsTree Assessment: Before fixing the wall, consult an arborist. If the mature lime tree's roots are causing the damage, repairing the wall without addressing the roots may lead to future cracking.Structural Repair: Because the garden is raised, the wall acts as a retaining structure. A simple patch-up likely won't suffice; the wall may need to be rebuilt with stronger foundations or reinforced materials to handle the lateral pressure of the soil.Legal Check: Since the wall borders a private alley where you have right of way, check your property deeds to confirm ownership and maintenance responsibilities before starting work

I would advise getting a landscaper/builder. The wall holds high pressure so would suggest a solid reinforced concrete wall that needs to be 400mm deeper than the alley walkway height and needs to be a minimum of 175mm thick although I’d recommend 200mm. It can be painted for brick effect after or can be rendered to your desired look. This will prevent further issues and the dig out process for the wall will remove the roots back around 500mm and the solid structure will prevent roots and weight from being an issue. A brick wall over time of being pushed creates cracks for roots to get in. A solid one piece concrete construction doesn’t have this problem and lasts for very long time