Is 50% upfront normal for builders?

A request for 50% upfront should slow the conversation down. It does not automatically mean the builder is dishonest, but it does mean the homeowner is taking a large amount of risk before any visible work has happened.

The key question is not whether 50% is ever normal. The better question is: what exactly is the payment for, and what protection do both sides have if the job changes or stops?

When 50% might be explainable

A larger upfront payment can make sense when the builder has genuine upfront costs. Examples include bespoke materials, made-to-measure items, specialist subcontractors, or products that need ordering before work starts.

Even then, the payment should be specific. A good request explains:

• which materials are being ordered
• who owns those materials once paid for
• when they will arrive
• what happens if the start date moves
• whether any deposit protection or insurance exists

Citizens Advice recommends getting building work terms in writing and being clear about payment points before work starts. Their guidance also says that if you need to pay a deposit, you should check whether the trader has insurance to protect it: Before you get work done on your home.

When 50% is a warning sign

A 50% deposit is much harder to justify when it is requested vaguely. Be careful if the builder says it is just to "secure the slot", asks for fast payment, avoids a written quote, or will not break down what the money covers.

The risk is simple: once the money has left your account, your leverage drops. If the trader delays, disappears, or disputes what was agreed, you may be left proving the terms after the fact.

That is why a large deposit should never be the only structure. It should be replaced or supported by a payment schedule that follows actual progress.

A safer alternative to one large deposit

Instead of paying 50% upfront, ask for a staged structure:

1. A smaller booking or materials payment tied to named costs.
2. A first milestone payment once agreed preparation work is complete.
3. Progress payments only when visible stages are finished.
4. A final payment after snagging or completion checks.

This is the same principle behind milestone payments: both sides know payment is available, but the homeowner is not handing over half the project budget before the job has substance.

What to ask before paying

Before you send a large deposit, ask:

• Can you show a written quote rather than an estimate?
• What exactly does this payment buy?
• Will I receive receipts or order confirmations for materials?
• Is the payment going to a business bank account?
• What happens if work does not start on the agreed date?
• Can we split this into smaller milestones?

If the builder is legitimate, these questions should not be offensive. They are basic risk controls for both sides.

The Slate view

Large upfront deposits create anxiety because they ask one side to trust first and hope later. Builders also need confidence that customers are serious and that payment will be available when work is done.

Milestone payments reduce that tension. The homeowner does not overpay ahead of progress, and the builder does not start work on vague promises.

FAQ

Is it illegal for a builder to ask for 50% upfront?

Not automatically. The problem is usually commercial risk rather than the number alone. Get the terms in writing and make sure the payment is tied to clear costs, materials, or milestones.

Should I refuse to pay 50% upfront?

You should ask for a breakdown and a staged alternative first. If the builder refuses to explain the payment or will not put terms in writing, that is a strong reason to pause.

What is safer than a large upfront deposit?

A written payment schedule is safer. Each payment should be linked to a clear stage of work, with final payment held until completion or snagging checks.