When to Hire a PPC Agency (And When to Keep It In-House)
The DIY Tipping Point
There’s a budget threshold where managing PPC yourself stops making sense. Below it, the cost of hiring an agency exceeds the value they can add. Above it, the cost of your own mistakes exceeds the cost of professional management.
That threshold is usually around £3,000–5,000 per month in ad spend. Below that, agency fees eat too much of your budget — if you’re spending £1,500 a month and an agency charges £750, half your total investment goes to management, not ads. The maths doesn’t work.
Above £5,000 a month, mistakes get expensive quickly. A poorly structured campaign can waste 30–40% of spend. On £5,000, that’s £1,500–2,000 per month going to irrelevant clicks, bad keywords, and traffic that never converts. An agency fee of £800–1,200 per month looks reasonable when it saves you that waste and improves performance on top.
But this is just the starting point. Budget alone doesn’t determine whether you need an agency. Let’s look at the actual signals.
Signs You Need an Agency
You’re spending money but not measuring results
If you’re running Google Ads or Meta Ads without proper conversion tracking, you don’t know what’s working. You’re spending money based on hope. Every week without tracking is another week of unaccountable spend.
This is one of the clearest signs you need help. Not because tracking is complicated (it’s not, once you know how), but because an agency will set it up properly as the first order of business. They won’t let you spend a penny without knowing what it produces.
Your performance has plateaued
You set up campaigns, they worked reasonably well, and then they stopped improving. You’ve tried adjusting bids, adding keywords, tweaking ad copy. Nothing moves the needle. This is where experience matters — someone who’s managed hundreds of accounts can usually spot the bottleneck quickly because they’ve seen it before.
Plateaus are often structural, not tactical. It’s not about better ad copy. It’s about campaign architecture, bidding strategy, audience segmentation, or landing page issues. Fresh eyes from someone who does this every day can break through in ways that more of the same approach can’t.
You don’t have the time
PPC isn’t a set-it-and-forget-it channel. It needs weekly attention at minimum — checking search terms, adjusting bids, testing ad copy, reviewing performance by segment. If you’re a business owner or marketer wearing multiple hats, PPC often drops to the bottom of the priority list. It gets checked once a month, problems compound, and by the time you notice, you’ve wasted significant budget.
An agency guarantees the work gets done consistently. That consistency alone can be worth the fee.
You need to scale and can’t figure out how
Scaling PPC isn’t just increasing budget. Double the budget on the same campaigns and you’ll often see diminishing returns — higher CPCs, lower conversion rates, wasted spend. Proper scaling involves new campaign types, audience expansion, funnel strategy, and budget allocation across channels. This is specialised knowledge that comes from doing it repeatedly.
Signs You Don’t Need an Agency Yet
You’re spending under £2,000 per month
At this budget level, learn the fundamentals yourself. Google’s own certifications are free. There are excellent YouTube channels and blogs (we’d recommend reading our other guides as a starting point). The investment in learning pays off whether you eventually hire an agency or not — you’ll be able to evaluate their work and hold them accountable.
You’re willing to learn and have the time
If you have 5–10 hours per week to dedicate to PPC and you’re genuinely interested in learning, you can manage most campaigns yourself up to a reasonable budget. The fundamentals aren’t that complicated. Keyword research, ad copy, landing pages, conversion tracking, bid management — each can be learned in a few hours. Mastery takes years, but competence takes weeks.
Your campaigns are already working well
If your cost per acquisition is where it needs to be, your conversion volume is growing, and your return on ad spend is healthy, don’t fix what isn’t broken. An agency might improve things marginally, but the gain might not justify the fee. If it ain’t broke, consider consulting for periodic audits instead of ongoing management.
What Good Agencies Do
They audit before they pitch
A good agency will look at your current setup before telling you what they can do. They want to understand your business, your goals, your current performance, and your constraints. If an agency gives you a proposal without looking at your account or asking detailed questions about your business, they’re selling a template, not a solution.
They set realistic expectations
No legitimate agency guarantees specific results. Anyone promising ‘page one rankings’ or ‘10x your leads’ is either lying or incompetent. Good agencies talk in terms of improvement ranges, timelines, and the variables that affect outcomes. They’ll tell you it takes 2–3 months to see meaningful results and explain why.
They’re transparent about what they do
You should know exactly what they’re doing in your account, how they’re spending your budget, and what results they’re getting. Monthly reports should be detailed but understandable. You should have access to your own accounts at all times. If you ask what they did last week, they should be able to tell you specifically.
They tell you no
This is a big one. If you ask an agency to do something that won’t work — running ads to a terrible landing page, targeting an audience that doesn’t make sense, spending money on a channel that won’t deliver — a good agency pushes back. An agency that says yes to everything is an agency that takes your money regardless of whether it helps you.
They focus on business outcomes, not vanity metrics
Clicks, impressions, and click-through rates are useful diagnostics, but they’re not results. Your business cares about leads, sales, revenue, and profit. A good agency ties everything back to these outcomes. If every report leads with impressions instead of conversions, something is off.
Red Flags
They won’t let you own your own account
Your Google Ads and Meta Ads accounts should belong to you. The agency should work within your accounts, not theirs. If they insist on running ads from their own manager account and won’t give you direct access, that’s a lock-in tactic. When you leave, you lose all your campaign data, conversion history, and audience lists. Walk away.
Long-term contracts with no exit clause
A 12-month contract with no break clause protects the agency, not you. Good agencies retain clients through results, not contracts. A reasonable setup is a 3-month initial term (to give enough time for proper setup and optimisation) followed by month-to-month with 30 days’ notice. If they need a year-long contract to keep you, what does that tell you about their confidence in delivering results?
Percentage-of-spend pricing with no cap
Some agencies charge a percentage of your ad spend — typically 10–20%. The problem: this creates a direct incentive to increase your spend regardless of whether it’s justified. The more you spend, the more they earn. A percentage model can work if there’s a fee cap and the agency can demonstrate that increased spend leads to proportionally increased results. Without a cap, it’s a blank cheque.
They can’t explain their strategy in plain English
If an agency hides behind jargon and can’t explain what they’re doing in simple terms, they either don’t understand it themselves or they’re trying to make simple things sound complicated to justify their fee. PPC isn’t rocket science. The strategy should be explainable in a few sentences.
They don’t ask about your business
If the first conversation is about their services rather than your business, your margins, your customer acquisition costs, and your growth goals — they’re not interested in your outcomes. They’re selling a service, not providing a solution. The best agencies spend most of the first call asking questions, not making pitches.
They claim to have ‘proprietary technology’
Some agencies claim they have proprietary tools or algorithms that give them an edge. In most cases, they’re using the same platforms and tools as everyone else with a custom dashboard on top. The edge in PPC comes from expertise, process, and attention — not secret software. Be sceptical of any agency whose main selling point is technology rather than knowledge.
Questions to Ask Before Hiring
- Who will actually work on my account? The person in the sales meeting is rarely the person managing your campaigns. Ask to meet the actual account manager and understand their experience level.
- How many accounts does each manager handle? If one person manages 30+ accounts, yours won’t get much attention. 8–15 accounts per manager is reasonable.
- Can I see examples of results for businesses similar to mine? Case studies should include specifics — not just ‘we increased conversions by 200%’ but context about budget, industry, and timeframe.
- What does the first 30 days look like? A good answer involves an audit, tracking setup, account restructuring, and baseline measurement. A bad answer involves immediately launching new campaigns.
- What’s your reporting cadence and what do reports include? Monthly reporting is standard. Reports should cover spend, conversions, cost per conversion, trends, what was done, and what’s planned next.
- Do I own my ad accounts and data? The only acceptable answer is yes.
- What happens if I want to leave? Understand the contract terms, notice period, and what you keep (account access, data, creative assets).
- How do you determine budget recommendations? Good agencies base this on your business goals, margins, and market data. Bad agencies just suggest spending more.
- What do you do when campaigns aren’t performing? The answer should involve specific diagnostic steps, not vague promises to ‘optimise’.
- What would you tell me not to do? An agency willing to tell you what not to spend money on is an agency focused on your results, not their revenue.
The Middle Ground: Consulting
You don’t have to choose between fully DIY and fully managed. Consulting sits in the middle — you manage the campaigns day-to-day, and a specialist reviews your work, provides strategic direction, and catches mistakes before they get expensive.
This works well for businesses in the £2,000–5,000 monthly spend range, or for in-house marketers who know the basics but want expert guidance. A monthly consulting session (2–4 hours) costs a fraction of full management and gives you most of the strategic benefit.
It also works as a trial run. Before committing to full management, hire a consultant for an audit and a few months of advisory. You’ll get a sense of whether professional input moves the needle for your business without a long-term commitment.
The key question isn’t ‘should I hire an agency?’ It’s ‘what level of help do I need right now?’ The answer changes as your business and your ad spend grow. Start with learning, move to consulting when you plateau, and consider full management when the budget justifies it and the right agency comes along.