You cannot exclude or limit liability for death or injury.
You can only exclude or limit liability for losses caused by negligence to the extent that this is reasonable. In most cases, including a contract term that simply excludes liability is unlikely to be reasonable. However, where you exclude liability to such an extent that it undermines the whole value of the contract for the other side, a court is likely to say that your exclusion clause is unreasonable.
There is, however, also scope to limit your liability. Any limit should take into account the value of the underlying contract, the resources you have available to meet claims, and the availability of insurance to cover you against claims.
It is worth taking advice to ensure that any terms limiting liability are reasonable and so will be effective.
