Money is being deducted from my account? Every question we answer on it, grouped by subject.
A contra-charge, also called a back-charge, is a deduction your main contractor makes from your payment for a cost it says you caused.
Usually, yes: most subcontracts say you must get notice and a reasonable chance to fix it before others are brought in at your cost.
Check the notice that carried it, then ask in writing for its basis, evidence and build-up, and answer each line on what comes back.
Yes, but only where each charge has a proper basis, in your subcontract or in law, and an amount the evidence supports.
No, and it is not meant to: it makes sure every deduction is seen, logged and challenged in writing while it can still be answered.
Your signed subcontract, the deduction schedule, the notices with proof of arrival, the records behind each item, and every valuation and payment notice to date.