Under most UK construction contracts, the main contractor is responsible for leaving the site clean and clear of debris as part of reaching practical completion -- normally included in the contract price, not billed separately. A further 'sparkle' or 'final' clean immediately before occupation, however, is often specified and priced separately, and who pays for that depends on what the contract says.
Whose responsibility is the builders clean?
The contractor remains in control of, and responsible for, the site up to practical completion. The general position is that clearing the site and removing construction debris and residue before completion is part of the contractor's obligation to complete the works -- so it is normally covered within the contract sum rather than charged as an extra.
What does JCT say about cleaning obligations?
JCT's standard forms do not contain a specific 'builders clean' clause setting a fixed cleaning standard. In practice the obligation flows from the contractor's general duty to bring the works to practical completion, and is commonly captured as a line item on a pre-practical-completion checklist agreed between the contractor and the contract administrator -- a practice JCT's own guidance highlights, since practical completion itself is 'easier to recognise than to define.' See our guide to handover-ready cleaning standards.
Who pays for the sparkle/final clean before occupation?
This varies by contract. Many specifications treat the final, detailed 'sparkle' clean immediately before occupation as a distinct, separately priced item -- sometimes instructed by the client or developer directly, particularly on housebuilding and fit-out projects, rather than automatically bundled into the main contractor's scope. Always confirm this in writing before works start -- see our guide to the difference between these terms.
What happens if the site isn't clean at completion?
If agreed cleaning or clearance items are outstanding and are more than trifling, the contract administrator can decline to certify practical completion, which can delay both handover and payment. Agreeing the checklist and responsibility for it in writing, before works start, avoids most disputes over who pays.