When 'While You're There' Becomes Unpaid Work: A Site Instruction Discipline for Smaller Trade Firms

On a busy UK site, change rarely arrives as a neatly typed instruction. It arrives as a request over a cup of tea: while you are there, can you just move that socket; the client has asked for an extra run; the main contractor wants a small alteration before the floor goes down. For smaller trade firms, responsiveness is a commercial strength. The risk is that repeated small favours become unpaid work, and later a dispute about what was agreed. The answer is not to imitate a large contractor's paperwork regime. It is to adopt a proportionate discipline that keeps the commercial position clear without souring the relationship.

Why the small instruction is easy to miss

Informal instructions feel harmless because each one looks minor. A socket moved, a pipe rerouted, a patch of plaster repaired, a door adjusted. Individually, they may take an hour or less. Cumulatively, they consume labour, materials, programme time and management attention. They can also affect warranties, testing and the scope of the original quotation.

The difficulty is evidence. If a client later says the work was included, a trade firm needs a record of what was asked, when, by whom and on what commercial basis. Without that record, even a strong practical case can become a time-consuming argument. The aim of written confirmation is therefore not to create a legal fortress. It is to create a shared, contemporaneous record that both sides can rely on.

Written confirmation should be a habit, not a confrontation

A short email or message sent the same day is usually enough. Where possible, it should be sent to the person who gave the instruction and copied to the person who controls payment, often the client or principal contractor. The note should confirm four things: what was requested, where it is, when it is needed and whether a price has been agreed.

A neutral opening works best. For example: Thank you for asking us to add the additional socket in the rear office. So that we both have the same record, this note confirms the request and that it falls outside our original quotation. We will issue a short variation with the price and any programme effect before starting.

That wording is clear without being accusatory. It treats the record as a service to the project rather than a challenge to the client's honesty.

Photographs help, provided they tell the story

Photographs are valuable when they are part of a sequence. Take a wide image showing the location and a close image showing the detail. Record the date, the room or elevation and the instruction reference. Before-and-after images are especially useful for making good, alterations and concealed work.

Photographs should be taken openly as part of normal site recording, not covertly. They do not replace a written instruction, but they make a written record easier to understand. Store them in a central folder linked to the job number, and keep them with the variation or daywork sheet. A photograph that cannot be found six months later has little value.

Price before work starts, or agree a clear stopping point

For non-urgent work, the safest sequence is instruction, price, approval, work. The variation need not be a long document. A one-page note setting out the additional work, the price, the effect on programme and the acceptance route is sufficient for most small changes.

Where the client wants speed, offer a choice. Option A could be the requested alteration carried out next week at an agreed price. Option B could be a temporary solution to keep the site safe, with the permanent work priced separately. Giving options keeps the conversation commercial rather than adversarial.

If a safety issue requires immediate action, deal with the risk first. Then confirm what was done and why as soon as practicable. The exception should be genuine, not a routine way to bypass pricing.

Simple scripts for raising the issue

When a client says just get it done, a calm response is: We can do that. I will send a short variation now with the price and the effect on programme. Once you reply to approve it, we will schedule the work. That keeps the main contract and the additional work clear for us both.

When a site manager asks for a change, try: Happy to help. Because this is a change to our agreed scope, I will need written confirmation from the client or principal contractor before we proceed. I will send the note now so there is no delay.

If the client resists paperwork, keep it short: I understand. We can still carry out the work, but we will need a two-line email confirming the instruction and price so our accounts team can process it. That protects both of us if the project is audited later.

These scripts work because they do not question the client's motive. They focus on the practical reason for the record: avoiding a query later and keeping the job moving.

Keep the system proportionate

Not every conversation needs a formal variation. A repeat client may prefer a weekly instruction sheet listing small additions, signed by the site contact. A daywork sheet can record labour and materials where the price cannot be fixed in advance. The key is consistency. If small instructions are recorded in the same way each week, they are less likely to be forgotten, disputed or absorbed into overheads.

Review open variations before invoicing and before the final account. A variation that was never priced should be flagged while the work is still fresh and the client is still available to approve it.

The relationship benefit

Clear records are not a sign of distrust. In practice, they reassure clients that the firm is organised, that the price is understood and that changes will not be hidden in a final bill. For smaller trade firms, that reputation is worth as much as the variation itself. The objective is simple: carry out the work, get paid for it and keep the relationship in good order.

P.F. Lynch & Co. advises trade and consultancy businesses on practical commercial controls. This article is general guidance, not legal advice.