My materials are on a site the administrator now controls

Materials built into the works generally become part of the building, whoever paid for them. Unfixed materials may still be yours. That depends on your terms keeping ownership until you were paid, and on you showing which items are yours. Even then, you can lose them if the employer, your main contractor's client, has already paid for them under the main contract. Your own plant is a separate question, but it still has to be identified and collected by agreement.

The risk is time. A replacement contractor can start using what is in the compound within days. Once your goods are fixed in, the argument is over. Taking them back yourself from a site you no longer control can create a claim against you. So the evidence and the written claim have to come first.

Photograph and list what is yours the same day, and match each item to its delivery ticket, invoice or serial number. Separate what is built in from what is loose. Then claim the loose goods and your plant from the administrator in writing, with the evidence attached, before anything is moved or used. Ask your solicitor on day one whether your terms kept ownership. Agree any collection with the administrator, and never just take the goods.

Insolvency Claim does the listing, matching and written claim with you on the first day. Your solicitor gets the ownership question with a complete file. What cannot come back goes into your claim as a debt. Our Handover Pack then shows how Insolvency Loss Prevention uses retention of title terms and delivery timing to protect your next job.