Variations are changes to an agreed scope of work, including additional work requested after the original agreement. Whether an item is genuinely additional depends on the initial scope and the specific change being proposed, rather than its label alone.
How this term relates to your project
An extra socket may appear to be a small choice, but it can affect cable routes, making good and the sequence of work. Describe the whole change rather than only the visible endpoint. Record which original elements will be omitted or carried out differently as well. Before deciding, request clarity about the revised scope, cost implications and programme.
Note who approves the change and which drawing or description is referenced. An idea discussed only verbally is difficult to reconstruct when expectations later differ. Keep a change register alongside the original quotation so the combined project remains understandable. Unexpected site conditions also deserve a specific description and discussion rather than an unexplained additional charge appearing at the end.