Variations and extras on a building job need paper, not goodwill

3 days ago
3 min read

Introduction

On almost every building project the scope changes. The client sees the space taking shape and asks for another socket, a different door, a bit more tiling. Individually each request is small enough that stopping to price it feels awkward, so the work gets done and the money gets discussed at the end.

That conversation at the end is where relationships break and margin disappears. The client remembers asking for a small change; the builder remembers three days of extra labour. Both are telling the truth, and the difference between them is the absence of a piece of paper at the moment the request was made.

1. Variations and extras on a building job must be priced before they are built

The sequence is the entire discipline.

Never start extra work on a verbal request

However reasonable the client and however small the change. Work begun without an agreed price is work you may end up donating. The client is not being dishonest; they simply never saw a figure.

Keep the process light enough to actually use

A one-page variation sheet, or a message with a figure and a yes. Anything heavier gets skipped under pressure, which defeats the purpose. A photograph of a signed sheet is enough.

2. Set the expectation at contract stage

The time to explain how changes work is before there are any.

Say plainly that changes cost money and time

Clients who are told at the outset that variations carry a price and a programme impact accept it far more readily than those who discover it later. Say it once, plainly, early.

Include a variation clause and walk them through it

Not buried in terms nobody read. A minute spent on it at signing prevents a fortnight of argument at completion.

3. Price the disruption, not just the materials

This is where builders systematically undercharge.

Include the knock-on effects

Moving a doorway after the plasterer has been is a different job from moving it before. Sequence disruption, return visits and waiting time are real costs. Trades standing idle is the expensive part.

Quote programme impact alongside price

Two days added, not just eight hundred pounds. Clients frequently choose differently when they see the timetable consequence.

4. Distinguish variations from things you missed

Being honest about this protects the relationship.

Own your own omissions

If it was in the drawings and you did not price it, that is not a variation. Absorbing it and saying so buys credibility for the ones that genuinely are changes. Clients can tell the difference and remember who was straight with them.

Log the client's changes as they happen

A running list, shared, updated weekly. Nobody disputes a total they have been watching accumulate.

5. Invoice variations as you go

The end of a job is the worst possible time to present a large unexpected figure.

Bill them with the nearest stage payment

Small amounts alongside expected invoices are absorbed easily. One large sum at completion feels like an ambush.

Get a signature or a written yes each time

The signature is not distrust, it is memory. Everybody has forgotten the detail of a conversation from six weeks earlier.

Conclusion

Price every change before you build it, however small the request and however good the relationship — work started on a verbal instruction is work you may not get paid for, and a one-page variation sheet is light enough to survive a busy site.

Explain at contract stage that changes carry both a cost and a programme impact, price the disruption and resequencing rather than only materials, be straight about the difference between a client's change and your own omission, keep a shared running list that the client watches grow, and invoice variations alongside the nearest stage payment rather than presenting a total at completion.