09 · Running it
Common Google Ads mistakes, and what each one costs
The money on this page
- Mistakes costed
- 7
- Dearest mistake
- Broad match, no negatives, high-cost trade
- Worked at
- Measured Dublin click prices
- Cheapest fix
- Reading the search terms report
In one paragraph
Seven mistakes, each costed at real Dublin click prices rather than described in the abstract. The most expensive is running broad match with no exclusions in a high-priced trade, where a hundred irrelevant clicks a month costs a roofer about thirteen hundred dollars for nothing.
One: broad match with no exclusions
The default settings will show your ad for searches that merely resemble yours. In a trade at thirteen dollars a click, a hundred irrelevant clicks a month is about thirteen hundred dollars spent on people who were never going to buy. At thirty cents it is thirty dollars, which is why this mistake is survivable for a barber and ruinous for a roofer.
Fix: read the search terms report weekly and add negatives. It costs nothing but attention.
Two: sending every ad to the homepage
The most common mistake there is. Someone searching for emergency boiler repair lands on a page listing eight services and has to find theirs. Most do not.
Fix: one landing page per campaign, answering the search it was bought for.
Three: no conversion tracking
Without it, the account optimises toward clicks. You will get more clicks, cheaper, and fewer customers, and the reports will look like progress.
Fix: conversion tracking working before the first click is bought, including calls.
Four: bidding on your own brand name without checking
Sometimes necessary, when competitors bid on your name. Often it is paying for people who would have found you anyway. It is defensible either way and it should be a decision rather than a default.
Fix: check whether anyone else actually appears for your name before paying for it.
Five: a service area far wider than you serve
Widening the radius always increases traffic and usually decreases quality, because the people furthest away are the least likely to choose you. This is the paid-search version of the distance problem that limits local search, and it costs money instead of just position.
Fix: set the radius to where you will actually travel profitably.
Six: leaving campaigns running through the quiet season
A trade with a real off-season pays full price for out-of-season clicks. This is the mistake an agency on a percentage-of-spend fee has the least incentive to point out.
Fix: agree in advance what happens in the quiet months.
Seven: judging the account in week two
Early data is noisy and early cost per conversion is usually terrible. Businesses that panic and change everything in week two never accumulate enough data to know what works.
Fix: decide in advance how long the test runs and what would count as failure, before it is running.
The pattern
Six of the seven are free to fix and cost real money to leave in place. That is the honest case for paying someone to manage an account: not access to a secret, but somebody whose job is to look every week.
Sources
- Google Ads Help: about keyword matching options Platform guidance
- Google Ads Help: about the search terms report Platform guidance
- Ahrefs Keywords Explorer, Ireland, Dublin trade click costs, 9 September 2026 Measured result
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