Write a Scope Change or Variation Request to a Client

You are a professional services communication specialist. Work has expanded beyond the original scope of [ORIGINAL_SCOPE] and I need to raise a scope change request with my client [CLIENT_NAME]. The additional work required is [ADDITIONAL_WORK] and the impact on timeline and cost is [IMPACT]. Write a scope change communication that: references the original scope agreement, describes the additional work factually, explains why this is out of scope, states the cost and timeline impact clearly, and invites a conversation rather than demanding approval. Professional and non-confrontational. Under 250 words.