Your agency quoted one price and the final invoice was more than double

Why the final invoice doubled

A quote is not a price. It is an estimate of the work the agency thinks you described, written in language vague enough to give them room to bill more later.

When the final invoice lands at double, one of three things has happened. The quote covered less than you thought it did. You asked for changes during the build that were quietly logged as extras. Or the agency built in time-based line items - meetings, revisions, project management - that scale with how long the project drags on.

Usually it is all three at once.

The tricks hidden in the original quote

Pull out the quote you signed and look for these phrases. They are how the gap gets engineered before you even start.

• "Up to X pages" - if you ended up with more pages, every extra one is billable, even if you only added them because the agency suggested it.
• "Standard revisions included" - standard usually means two or three. Round four is charged by the hour.
• "Subject to scope" or "based on current requirements" - this is the agency reserving the right to rewrite the price later.
• "Excludes content, imagery, third-party integrations" - if you did not supply finished copy and photos on day one, someone billed time chasing you for them.
• "Project management at X% of build cost" - a line that scales automatically as the build cost grows.
• "Hourly rate for additional work: £X" - the rate is in the quote so they can point at it later and say you agreed.

Every one of these is legal. None of them are flagged at the point you signed.

What you can challenge on the invoice

Ask for a line-by-line breakdown of the invoice against the original quote. Not a summary. The actual hours, dates, and what was done. If they cannot produce one, that is your first leverage point.

Then go through it and separate the charges into three piles.

• Things you explicitly asked for after signing. These you probably owe, though the rate is still negotiable.
• Things the agency suggested and you agreed to. These are softer. If they pitched it as an improvement and never said "this will cost extra," you have grounds to push back.
• Internal time you never saw. Project management, account handover, internal meetings, "client communication." If it was not in the quote as a separate line, challenge it.

The internal time pile is usually where the doubling happens. Agencies bill for meetings about your project that you were not in.

How to push back without losing the site

The agency has your site, your domain, and your invoice. You need the site live and you need to not pay double. Those goals are compatible if you handle it in writing.

Send one email. Reference the original quote by date. List the charges you dispute and why. Ask for a revised invoice. Do not threaten, do not refuse to pay anything, and do not get into a phone call where nothing is recorded.

Most agencies will knock 20-40% off a disputed invoice rather than chase you through small claims. Going to court over a £2,000 dispute costs them more in time than the discount. The agency knows this. So should you.

If the dispute drags, pay the undisputed portion in writing - "I am paying £X, which covers the items I agreed to. The remaining £Y is in dispute pending your response." That protects you legally and gets the site released.

How to avoid this on the next build

The fix is not to find a more honest agency. It is to make the quote impossible to inflate.

• Get a fixed price in writing, with no "subject to scope" language. If they will not commit, the quote is fiction.
• Make them list what is excluded. If exclusions are not written down, everything is potentially extra.
• Agree a change rate before you start. Anything not in the original brief gets a quote in writing before work begins. No quote, no work, no charge.
• Cap project management and meeting time. Or refuse to pay for it as a separate line.
• Ask who owns the domain, hosting, and code on day one. If the answer is not "you," walk.

This is where I come in. I quote a fixed price for the build - from £600 - and the price on the email is the price on the invoice. If you want changes after sign-off, I tell you what they cost before I start. If you want to stay on for hosting and updates after launch, the Maintained plan is £65/month and includes ten content changes, which is more than most small businesses need in a year.

No project management line. No discovery phase that bills by the hour. No revision rounds counted on fingers.