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The Email That Becomes the Contract
This is not legal advice, and what constitutes a binding agreement varies by jurisdiction and by the type of customer.
For a software-side reference alongside this discussion of pre-work decisions, contracts, and small-business administration, Monitask has this resource.
Very few small jobs involve a signed contract. What exists instead is a quote, a reply, and a series of messages — and if there is ever a dispute, that exchange is the document.
What the exchange has to establish
Who the parties are. The legal entity on both sides.
What is being done, which is the quote's job and is why the quote should be attached or referenced rather than summarised in the message.
For how much, and on what terms.
And that both sides agreed. An offer and an acceptance, identifiable as such.
Four things. Most exchanges have two of them and assume the rest.
The message that does it
From you, after a verbal go-ahead:
"Confirming you'd like me to proceed on the basis of quote 214 dated 3 March — £1,840 including materials, 30% deposit, balance due 14 days from completion. I'll book you in for the week of the 17th. Let me know if anything there is wrong."
Four sentences. It names the document, restates the price and terms, states what happens next, and invites correction.
The last part matters. An unchallenged confirmation is considerably stronger than an unanswered assumption, and inviting correction is what makes silence meaningful.
Why writing it yourself is better than waiting
Customers rarely send confirmations.
Waiting for one produces jobs that start on a phone call and finish in an argument, and the supplier is the party who wanted the confirmation, so the supplier should write it.
It also settles the terms in your words rather than in whatever the customer's reply happened to say.
What to do about the messages that follow
Keep them, and keep them findable.
A thread per job, with the job reference in the subject line, is enough. Scattered across a phone, a personal account and a business account is how evidence disappears, and it disappears at the moment it is needed.
Text messages are writing too, and in trades they are frequently where the real agreement lives. Screenshot the ones that matter — phones are lost, numbers change, and messaging apps are not archives. Records need to survive two years.
The dangerous messages
"Don't worry about the paperwork, just get it done."
A customer who says this is not being generous. They are removing the thing that would settle a later disagreement, and the disagreement is one they would win.
"We'll sort the price out when we see how it goes."
This is the request to work without an agreed price, and it means the price will be negotiated after the leverage has moved.
And silence in response to a variation.
A confirmed extra that receives no reply is not agreed. Chase the reply before doing the work, because a variation the customer never acknowledged is the one they will contest.
Attachments and where they go
Attach the quote to the confirmation rather than describing it.
A message saying "as per the quote" is only as good as both parties' ability to find the quote two months later, and attachments survive better than memory of which version was current.
Where the quote was revised, attach the current one and say which it replaces. Numbered revisions exist for this.
And send from an address you will still have. A personal account used for one job, or a free address tied to an internet provider you may leave, is a records problem waiting to happen.
The reply that is not agreement
"Thanks" is not acceptance.
Nor is "sounds good", "great", or a thumbs-up reaction — although in practice these are often treated as such, and the customer who sent one was probably agreeing.
Where the sum is significant, ask for the words. "Just confirm you're happy to proceed on that basis and I'll get it booked in" produces a message that says something, and it costs one extra exchange.
Where the sum is small, a thumbs-up plus your unchallenged confirmation is usually the practical reality and is better than nothing, which is what most jobs have.
What this does not replace
A written contract for large or complex work, where the sums justify it and the terms cannot fit in a quote.
Sector requirements — some trades and jurisdictions require specific written terms for consumer work, including cancellation notices, and failing to provide them can affect enforceability.
Check what applies to you. This page is about the ordinary case, where the exchange is all there is and the question is whether it is any good.
The thread as a record of the job
The exchange does more than establish the agreement — it dates everything.
When the go-ahead was given, when the variation was requested, when access was refused, when the customer said the tiles had arrived. Each of those has a timestamp nobody set deliberately, and together they are the account of what happened.
This matters most when a dispute is about delay rather than money. A customer claiming the job overran has to contend with the message showing they supplied the materials three weeks late, and that message exists whether or not anybody was thinking about evidence at the time.
Which is an argument for replying in writing to things that arrive by phone. "Just to confirm what we discussed" costs a minute and converts a conversation into a dated record.
What to write when you disagree
Plainly, once, at the time.
A customer who asserts something you do not accept — that a variation was included, that a date was agreed — should receive a short written response saying so. Not an argument: a statement.
Silence in the face of an assertion is the thing that weakens a position later, because the obvious question is why nobody said anything at the time. One paragraph, sent the same day, removes that question entirely.
The short version
- Most small-firm agreements are an exchange of messages, and that exchange is the document if there is ever a dispute
- It has to establish who the parties are, what is being done, for how much and on what terms, and that both sides agreed
- Write the confirmation yourself after a verbal go-ahead: name the quote, restate price and terms, say what happens next, invite correction
- Inviting correction is what makes silence meaningful
- Keep a thread per job with the reference in the subject; text messages count and should be screenshotted
- "Don't worry about the paperwork" removes the thing that would settle a dispute the customer would otherwise lose
For broader background on pre-work decisions, contracts, and small-business administration, see Xero.