They can sell what you leave behind.

Promptly, and then twenty-eight days

The clause carries two standards and it is worth separating them.

The obligation is to act promptly after the certificate — a standard about conduct, judged against circumstances. The sanction bites at twenty-eight days — a number, which arrives whether or not anybody has been prompt.

So there is a period in which you can be behind on the obligation without being exposed to the remedy, and a moment when that stops. Four weeks isn't long to organise the removal of equipment from a site you left years earlier.

The work itself is small — a lorry, a permit, somebody to meet it. What takes the time is finding out what is there, whose it is, and who still has a key.

The clock may start on a date nobody announced

The twenty-eight days run from the Performance Certificate, and last week established what that certificate can be.

Where the Engineer fails to issue it, it is deemed issued a month after it was due. A deemed certificate produces no document, no covering email and no notification. It is simply the case that the date has passed.

Which means the disposal window can be open, and running, while both sides believe they are still waiting for a certificate. The only defence is arithmetic: the latest expiry date from week 34, plus the period for issuing, plus the deeming period.

Three additions, done once, on a date you already hold. It is the cheapest protection in this phase and it exists only because somebody chose to calculate a date nothing was going to tell them.

Worth doing even where relations are good and a certificate is expected. The deeming isn't a hostile act by anybody — it is what happens when an Engineer is busy, and the consequences run identically either way.

Reinstatement is scoped by what you did

Here is the part that reaches back further than anything else in this phase.

What has to be reinstated isn't an area agreed at the end. It is the parts of the site affected by the contractor's activities during the works, excluding whatever the permanent works now occupy. The scope is defined by causation.

So the question at the end is which parts your activities affected — and answering it requires knowing what the site was like before you started. That record was asked for in week 19, on the day of access, before anything was changed: condition and extent, photographed and dated.

A project that made it can draw the line. A project that didn't is negotiating the scope of its final obligation against the other party's recollection, three years after the only day it could have been settled cheaply.

And the asymmetry runs against you. Anything ambiguous on a site at the end looks like something a contractor did, because a contractor is what has been there. Without a before, every argument starts from the after.

Which is this track's argument in its purest form. A record that took an hour on the first morning defines a duty in the last month, and nothing in between could have replaced it.

Credited at a price you didn't set

The financial mechanism has a symmetry that is easy to miss.

You pay the costs the employer reasonably incurs in the sale, the disposal, and the reinstating and cleaning — less the money the sale raised. The proceeds are credited to you.

Which is fairer than it first looks and worse than it sounds. Fairer, because the value of your property isn't simply forfeited. Worse, because that value gets established in a sale run by somebody with no interest in the price, disposing of items they want removed rather than realised.

And the costs side is uncapped in a way the proceeds side isn't. Clearing a site is priced by whoever is asked to do it, at short notice, for a client who isn't paying.

And you won't be present for it. A disposal conducted after a deadline you missed is conducted without you, so the first account of what your property was worth arrives as a line in an invoice.

What is left is what nobody wanted

One practical observation about the items this clause operates on.

The certificate arrives long after demobilisation. Everything worth taking went when the crews went, at the point week 19 described. What remains on a site at that stage is what was left because the transport cost more than the item: a container, some scaffold, a site cabin, spoil, a length of temporary fence.

Individually those are worth little, which is exactly why the obligation gets deprioritised. Collectively, and against a removal cost somebody else will incur and charge to you, they are worth an afternoon of attention in the month the certificate is expected.

There is also a second category worth separating: things left with permission. A cabin the employer asked to keep, a fence they wanted to retain. Those aren't surplus and should not be disposed of — but the clause doesn't know that, and the only thing that establishes it is a note of who agreed and when.

Which argues for one decision made deliberately at demobilisation rather than by default: what is worth transporting, what is worth abandoning, and what has to go regardless because leaving it triggers the clause. Those are three different answers and only the third is about value.

System design

Row three is the only entry in this dictionary produced three years before the week that needs it. Everything else here can be made now; that one had to be made on the first day of access, by somebody with no reason to think it would define the last obligation in the contract.

Record	Produced by	Required quality	Verified against	Feeds
Leave-behind list	You, at demobilisation	What is staying, its value, why, and who agreed it	Walking the site as the crews go	What is exposed to disposal
Calculated disposal date	You, from week 34’s sheet	Latest expiry, plus the certificate period, plus the deeming	The arithmetic itself	The only warning a deemed certificate gives
Day-one site record	The first day of access	Retrieved from the archive and put where it can be found	The site as it was	The scope of reinstatement
Reinstatement as performed	You, on completion of it	Photographed against the day-one set, same viewpoints	The record it answers	Whether the obligation is discharged
Sale or disposal account	The employer, if it happens	Costs incurred and proceeds raised, separately stated	What was sold and for what	The net amount charged to you

Row two is arithmetic rather than a record, and it is here because a deemed certificate issues no paper. The date has to be calculated by somebody who wants to know it, or it passes unobserved.

Practical insight

Make your leave-behind list at demobilisation, not at the certificate.

Walk the site the week your crews go and write down what is staying: what it is, roughly what it is worth, why it is still there, and who agreed it could stay. Ten lines, and you are the last person who can write them — in six months nobody left will know why a container is standing where it is.

Your fourth column matters more than the other three. An item somebody asked you to leave and an item you failed to collect look identical on a site and are entirely different under this clause.

Then calculate your date. Take your latest expiry from week 34, add the period for issuing the certificate, add the deeming period. That gives you the day your disposal window opens even if no certificate ever reaches you, and it is the only warning you get.

And put your day-one site record where you can find it. If a reinstatement scope is ever argued, that photograph set is the entire answer, and the argument is over in ten minutes instead of a season.

Key takeaways

• After the certificate that accepts the works, one physical obligation remains: remove what is yours and reinstate what your work disturbed.
• Miss the deadline and the employer may sell or dispose of what remains, and reinstate and clean at your cost.
• Nothing else in the contract permits the other party to sell your property outright.
• The obligation is to act promptly, which is judged against circumstances; the sanction arrives at twenty-eight days, which is a number.
• Four weeks isn't long to remove equipment from a site the team left years earlier.
• The period runs from the Performance Certificate, which can be deemed issued and produces no document when it is.
• So the disposal window can be open while everybody believes they are still waiting, and the only defence is arithmetic.
• Reinstatement is scoped by causation — the parts affected by your activities, less what the permanent works occupy.
• Answering that requires knowing what the site was like before you started, which is the day-one record from week 19.
• A project without that record negotiates its final obligation against the other party’s recollection.
• The costs are charged to you less the proceeds of the sale, so your property is credited at a price set by somebody with no interest in it.
• What remains at that stage was left because moving it cost more than it was worth, which is why the obligation gets deprioritised.

Records born here. The leave-behind list, made at demobilisation · what each item is worth and who agreed it could stay · the calculated date the disposal window opens · the day-one site record, retrieved and filed where it can be found · the reinstatement as performed, photographed · any sale or disposal, with the costs and the proceeds.

What is coming next

The site is clear. What remains is a number, and two organisations who disagree about it.

The final account settles everything measured, everything varied, everything claimed and everything withheld across the whole life of the contract — and it is assembled from records made by people who have left, in a process with its own deadlines and its own way of closing the door.