Do you need a contract for building work? A tradesperson's guide

Most tradespeople start work on a handshake, a phone call, or a brief text exchange. For small jobs that finish in a day, this is rarely a problem. But for anything larger — a bathroom refit, a new heating system, a loft conversion — working without a written contract is one of the most common causes of disputes, non-payment, and costly legal action. This guide explains what a proper building contract covers, when you need one, and how to protect yourself without alienating customers or burying them in paperwork.

Why most tradespeople work without contracts

The reasons are understandable. Writing a contract feels formal and awkward, as though you are signalling distrust to a new customer before you have even met. Many tradespeople worry that producing a formal document will put customers off, particularly in a competitive local market where the next plumber is a phone call away.

There is also a perception that contracts are only for large commercial projects — something solicitors and main contractors deal with, not sole-trader electricians fitting a consumer unit or builders doing a kitchen extension. This perception is wrong, and the consequences of acting on it can be severe.

The majority of trade disputes that end up in the small claims court or with a solicitor's involvement share one feature: there was no clear written agreement about what was included in the price, how additional work would be charged, or what the payment terms were. These disputes are almost always avoidable with a straightforward written agreement signed before work begins.

Verbal contracts are legal — but almost impossible to enforce

In English and Welsh law, a verbal contract is legally binding. If you agree a price on the phone and the customer agrees to it, a contract exists. The problem is proving what was agreed. Without written evidence, any dispute becomes a “he said, she said” situation — and courts must weigh two conflicting accounts against each other with no documentary evidence to guide them.

What a customer heard when you said “around three and a half grand” may be very different from what you meant. Did that include the cost of the new radiators? Did it assume the floor was in reasonable condition? Did it cover making good after the work was done? Verbal agreements collapse under the weight of ambiguity the moment a dispute arises.

Even WhatsApp messages and email exchanges can serve as evidence of a verbal or written agreement — which is why keeping all customer communications in a single system (rather than spread across personal phones) matters more than most tradespeople realise.

What a building contract should include

A contract for building or trade work does not need to be a complex legal document. For most residential jobs, a clear written quote accepted in writing — combined with simple terms and conditions — covers the vast majority of situations. Here is what every building contract should address:

• Scope of works: a precise description of what is included. The more specific the better. “Supply and install a Worcester Bosch 30i Greenstar combi boiler, including removal and disposal of existing boiler, connection to existing pipework and flue, and commissioning” is enforceable. “New boiler” is not.
• What is excluded: equally important. If making good after the work is not included, say so explicitly. If the price assumes no hidden issues behind the walls, say that. If scaffolding is the customer's responsibility, spell it out.
• Price: whether fixed or day rate, VAT status (is it included or added?), and what allowances have been made for materials.
• Payment schedule: when payments are due, in what amounts, and by what method. For jobs over £2,000, stage payments tied to completion milestones protect both parties.
• Timeline: when work will start, an estimated completion date, and what happens if either party causes delay.
• Variations: how additional work will be agreed and charged. This is the single most important clause for preventing scope creep disputes.
• Dispute resolution: how disagreements will be handled if they arise — whether that is escalation to a trade association, adjudication, or the small claims court.

The JCT Minor Works contract

The Joint Contracts Tribunal (JCT) produces a range of standard building contracts widely used in the UK. For smaller residential and commercial projects, the JCT Minor Works Building Contract is the most relevant. It covers scope, price, payment, insurance responsibilities, defects, and dispute resolution in a standardised form that both parties and their advisors will recognise.

JCT contracts are not free — you purchase them from the JCT website (around £50–£70 for a Minor Works contract). They are also not always proportionate for small jobs. A JCT Minor Works contract makes sense for a £15,000+ project involving significant building work, particularly if the client is a business, a landlord, or a local authority. For a residential bathroom refit worth £5,000, a detailed written quote with clear terms is more appropriate than a formal JCT contract.

If you regularly work on larger commercial projects, investing in a JCT contract template — and having a solicitor review it once — is worthwhile. For most residential trade businesses, a well-written quote with clear terms achieves the same protection for a fraction of the cost.

Handling scope creep with a written variation process

Scope creep — where a customer asks for additional work beyond the original quote and then disputes the additional charge — is one of the most common sources of trade disputes. The solution is a simple written variation process.

Every time a customer asks for something not included in the original scope, issue a brief variation notice before doing the work. It does not need to be formal: a WhatsApp message, email, or job note stating “You've asked us to [description of extra work]. This will cost an additional £[amount] and is not included in the original quote. Please confirm by replying to this message” is sufficient.

The key is to get confirmation before you do the extra work, not after. A customer who agrees to an additional charge in writing before the work is done is extremely unlikely to dispute it on the final invoice. A customer who finds a new line item on an invoice for work they “just mentioned in passing” very often does.

Never absorb additional work into the original price without agreeing it in writing. The habit of doing “a bit extra” for free erodes your margin and sets the expectation that scope can expand without cost. It also means you have no record of what was done if the customer later disputes something.

What to do when a customer refuses to pay

Despite everything, some customers will refuse to pay. Your options depend on the amount owed and the nature of the dispute.

For debts up to £10,000, the small claims court (Money Claim Online in England and Wales) is the most practical route. The process is designed to be used without a solicitor, filing fees are modest (typically £35–£455 depending on the claim value), and judgments in your favour can be enforced via court-appointed enforcement officers. If you have a signed quote, written variation records, and a clear payment schedule, your position in the small claims court is strong.

Before issuing a claim, send a formal Letter Before Action (LBA) — a letter stating the amount owed, the basis for the debt, and a clear deadline (typically 14 days) for payment before you issue proceedings. Many non-paying customers settle at this stage rather than face court. Keep the letter professional and factual, not emotional.

For larger debts or disputed work, a statutory demand is another option. If a business customer owes you more than £750, a statutory demand gives them 21 days to pay or face insolvency proceedings. This is a serious step and should not be issued lightly — but the threat alone often resolves genuine commercial debts quickly. Take legal advice before issuing one.

Using Trade2Base quotes as a lightweight contract

Trade2Base quotes are designed to function as the primary contractual document for trade businesses. Each quote includes a full line-item breakdown of the work, your payment terms, and a digital sign-off mechanism that captures the customer's acceptance with a timestamp and their name.

When a customer signs off a Trade2Base quote, the accepted document is stored permanently against their record. You can retrieve it at any time — including from your phone at a site meeting — and it constitutes a clear written agreement of what was quoted and accepted. For the vast majority of residential trade jobs, this is sufficient contractual protection.

You can also attach your standard terms and conditions to every Trade2Base quote, meaning every customer who accepts a quote has formally received and accepted your T&Cs — whether or not they have read them. For the terms to be enforceable, they must be made available before the customer accepts the quote, not after. Trade2Base handles this automatically by including them with every quote sent.

Combined with written variation notices sent via the job notes, a clear payment schedule, and automated invoice reminders, a Trade2Base quote workflow gives sole traders and small trade teams commercial-grade protection without the complexity or cost of formal legal contracts on every job. Start every job in writing. It takes 90 seconds to send a quote and get it signed. A dispute can take months and cost thousands to resolve. The maths is not complicated.