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A paid ad can look simple from the outside. You pick a few words, set a budget, and wait for the phone to ring. Then the first month ends and the bill is higher than you expected. The clicks came in, but the customers did not.

This happens more often than most owners admit. The good news is that it is usually avoidable. Most of the difference comes down to who is running your campaigns. If you are comparing a PPC agency London has to offer, this guide will help you ask the right questions and spot the signs of a good fit.

Start With What a Lead Is Worth

Before you talk to anyone, work out what a new customer is worth to you. Think about the average sale, how often people come back, and how much profit is left after your costs.

This number matters because it sets your limit. If a customer brings you 400 pounds in profit, paying 60 pounds to win one is reasonable. If a customer brings you 50 pounds, it is not. A good agency will ask for these figures early. A weak one will skip straight to clicks and impressions.

Check That They Understand London

London is a crowded market. Some search terms cost far more here than in other cities, and the competition changes by area. An ad that works for a business in Canary Wharf may fall flat in Croydon.

A solid PPC agency London business owners trust will talk about location targeting in detail. They will ask where your best customers live, which boroughs bring in the most work, and whether you want to avoid certain areas. They should also know how to handle busy periods, such as the weeks before Christmas or the start of the school year.

Ask Which Platforms They Actually Use

PPC is not only Google. Depending on your business, Microsoft Ads, Meta, LinkedIn, or YouTube might make more sense. A trustworthy agency will suggest the platform that fits your goal, not the one that is easiest for them to manage.

If you sell to other businesses, for example, LinkedIn may be worth a test. If you run a local restaurant, a mix of Google Maps ads and social ads might work better. Ask them why they recommend each platform. The reasoning matters more than the answer.

Look Closely at How They Charge

Agencies price their work in different ways. Some charge a flat monthly fee. Others take a percentage of your ad spend. Some combine both.

Each model has pros and cons. A percentage fee can make an agency want you to spend more, even when it is not needed. A flat fee is easier to plan around, but you should check how many hours it covers. Whatever the model, ask for the full picture in writing. That includes setup costs, reporting costs, and any minimum contract length.

Also ask who pays Google. Your ad budget should go straight from your own account to the platform. You do not want it sitting in the agency’s account.

Make Sure You Own Your Ad Account

This is a point many owners learn too late. The ad account, the data inside it, and the tracking should all belong to you. The agency gets access, but you hold the keys.

If an agency runs everything under its own account, you could lose your history when you leave. That history is useful. It shows which keywords worked and which ones wasted money. Ask about ownership before you sign.

Ask How They Measure Success

Clicks are easy to count. Customers are harder. A good agency will set up proper tracking so you can see calls, form fills, bookings, and sales that came from your ads.

Ask what they will track and how. Ask whether they can record phone calls or connect your website to a customer system. Without this setup, no one can tell if the campaign is working. Be careful if an agency leans on numbers like impressions or click rate and says little about leads.

Look for Honest Reporting

Reports should be short and written in plain language. You should be able to see how much you spent, what you got for it, and what the agency plans to change next.

Ask for a sample report before you hire anyone. If it is full of charts but gives no clear answer to the question “did this make me money,” that is a sign to keep looking. Also ask how often you will meet. A monthly call is a good minimum. In the early weeks, you may want a check in every week.

Be Careful With Quick Promises

No agency can guarantee a certain number of sales. Too many things sit outside their control, such as your prices, your website, and your competitors.

What they can do is explain a realistic path. Most campaigns need a few weeks of testing before they settle. An honest agency will tell you this and set expectations early. If someone promises instant results, treat that as a warning.

Review the Landing Pages

An ad is only half the story. After someone clicks, they land on a page. If that page is slow, confusing, or hard to use on a phone, the money you spent on the click is wasted.

Ask whether the agency will help improve your landing pages or suggest changes to your website. The best PPC agency London has available will care about what happens after the click, not just before it.

Talk to Their Current Clients

Ask for two or three client references. A short call with a current customer can tell you how the agency handles problems, how quickly they reply, and whether the results matched what was promised.

You can also read reviews on Google and Clutch. Look for patterns. One bad review is normal. The same complaint repeated several times is worth noticing.

Pay Attention to the Contract

Check how long you are committed and how much notice you need to give if you leave. Some agencies ask for six or twelve months. Others work month to month.

Neither is always wrong. What matters is that you know the terms and feel comfortable with them. A fair agency will walk you through the details without pressure.

Final Thoughts

Choosing a PPC agency London businesses can trust comes down to a few simple habits. Know what a customer is worth. Ask how results are measured. Keep ownership of your accounts. Look for honest reporting and realistic promises.

Speak to two or three agencies before you decide. Compare how they listen, how they explain things, and how they treat your questions. The right team will make your ad spend feel clearer, not more confusing.