lI have been told that my side wall has 2cracks, posibly needs underpinning. HELP

You have to go through a process of elimination First of all you need to dig a section of ground where the cracks are against the wall to see if there is roots If there is routes you need to get expert advice to see if the roots are causing this damage Sometimes large trees drain the ground of moisture this will cause a shrinkage of the soil which could cause subsidence After you’ve done these projects in our opinion we were call IN The experts to give their advice on what precautions we should do it is no good just to underpin and think this is a Solution as if you do not find a problem that is causing the subsidence you may waste money trying to rectify it so you have the expert advice

Sorry to hear that, there are many reasons for cracks in walls, I would suggest that an inspection hole is dug to check the integrity of the foundations. Trees depending what they are can cause problems but generally not from roots damaging the foundation but from expansion and contraction of the soil, If you live in an area with high shrinkable clay then of course if the trees take in a lot of water and the ground is dry then as the water decreases in the ground the soil will contract and can cause movement, Unfortunately you would need to have this investigated. I would say that your home insurance company would be the best and most logical point of first contact. Explain the situation and I am sure they would work with you to have a surveyor visit and make a report.That is what insurance is for. I wish you good luck and hope the problem is resolved quickly

Long answer short. Consult a RICS building surveyor. Far too many variables to give you an answer on here but subsidence and wall movement can happen in a number of different circumstances. Could be earth movement due to poor substrate below, your dwelling could be in a coal area, a large amount of trees local to the property, collapsed or poor drainage.. there are many many different variables and giving an answer on here wont tell the whole story. Always consult a surveyor or engineer when it comes to cracks on properties.