PPC agency vs in-house, decided on criteria you can check
The PPC agency vs in-house decision turns on one line: whether your monthly ad spend and workload genuinely justify a full-time salary. Below that line, an agency or freelancer buys senior attention for a fraction of an employment package; above it, an in-house manager's full-time immersion starts to win. The criteria that decide it are published below, row by row, so the reasoning can be checked rather than taken on trust. GrowthLine is a PPC agency, so read the agency column knowing who wrote it — the table still names the rows in-house wins.
Pros and cons, criterion by criterion
Eight criteria decide this; each row below says plainly which model it favours.
| criterion | in-house PPC manager | PPC agency |
|---|---|---|
| cost shape | A full employment package — salary plus employer NI, pension, tools, training and recruitment — committed for the year whatever the results. | A monthly management fee, cancellable on notice; at small-to-mid spends it is normally a fraction of an employment package. |
| time to start | A recruitment cycle: advertise, interview, notice period, ramp-up — realistically months before full output. | Days to weeks: audit first, then onboarding against an agreed plan. |
| hours on your account | Full-time and all yours — no other client competes for attention. | A share of a specialist’s week. Ask any agency, this one included, how many accounts each person runs. |
| business context | Sits inside the business: hears the sales calls, knows the margins, feels the seasonality first-hand. | Has to earn that context deliberately, and never matches daily immersion. |
| breadth of test data | Learns from one account’s data only. | Sees what works and what fails across many accounts in parallel — mistakes get paid for on someone else’s budget first. |
| cover and continuity | One person is a single point of failure: holiday, sickness and resignation all stop the work. | Continuity is contractual; the account does not stop when one person is away. |
| accountability | Judged by internal review — hard when nobody else in the business can benchmark the work. | Judged monthly against cost per lead, on a contract you can end at notice. |
| switching cost if it fails | A redundancy or dismissal process, plus months of sunk salary and a restarted recruitment cycle. | A notice period — and you keep the account and its history, provided you own the account. Insist on owning it. |
| who it’s for | Businesses whose spend and workload genuinely fill a full-time role, with marketing leadership able to manage and benchmark it. | Businesses below that line that want senior attention without an employment commitment. |
| who it’s not for | Anyone hiring a junior to ‘do the ads’ with no one qualified to check the work. | Businesses whose PPC is so core and so large that anything less than dedicated daily immersion costs them money. |
The agency column describes agencies in general, GrowthLine included — where a row favours in-house, it favours it against GrowthLine too. No scoring, no totals, no winner badge: the rows are the answer.
PPC agency vs in-house: the cost comparison
The honest comparison is package vs fee, not salary vs fee. An in-house hire costs a full-time salary plus employer National Insurance, pension, tools, training and recruitment; an agency costs a monthly management fee. Most agencies don't publish that fee — GrowthLine's is published in full at PPC management cost.
No salary figure is quoted here, because salaries vary by region and seniority and this site does not print numbers it cannot source; live job-board listings for your region are the only current benchmark worth using. What is safe to say: a competent PPC manager commands a full professional salary, and employment on-costs add materially on top.
| cost line | in-house hire | PPC agency |
|---|---|---|
| base cost | Full-time salary — varies by region and seniority; no figure quoted here (the FAQ says why). | Monthly management fee — GrowthLine’s is published in full on the pricing page. |
| employment on-costs | Employer National Insurance and pension, on top of salary. | None — a fee, not a payroll entry. |
| tools | Bought separately: call tracking, landing-page software, reporting. | Varies by agency — check what the fee includes before signing. |
| training | Ongoing and on your budget — the platform changes constantly. | The agency’s own cost. |
| recruitment & replacement | Recruiter fees plus a coverage gap at every departure. | None; leaving means serving a notice period. |
| media spend | Identical in both models — paid by you to Google either way. | Identical in both models — paid by you to Google either way. |
The structural point: an employment package is a fixed cost that only amortises at high spend, while a management fee scales down with the engagement. As spend grows, the salary shrinks as a share of total cost and the in-house case strengthens. The decision flow below turns that into a sequence.
The decision flow: when in-house wins
-
q1 · spend & workload
Would the account genuinely fill a competent person's week, and is spend high enough that a full employment package is a minor share of total cost? Yes to both: in-house is affordable — keep going. No: an agency or freelancer, because a fee scales down and a salary doesn't.
-
q2 · immersion
Does winning in your market need daily commercial context — pricing changes, capacity, sales feedback — applied to the account the same day? Yes, and q1 passed: in-house wins.
-
q3 · benchmarking
Can anyone in the business judge whether the work is good? If not, external accountability — monthly cost-per-lead reporting on a contract you can end — is safer than an unbenchmarked hire.
-
q4 · cover
Can the channel afford to stop when one person is on holiday or leaves? If not, and you still want in-house, budget for external cover — that is the hybrid below.
If in-house wins
Say it plainly, no hedging: where spend is high, PPC is the core acquisition channel, and marketing leadership exists to manage the role, hire — an employee's immersion beats any agency's attention, this one included. Two conditions worth stating as advice: hire seniority, not a junior with no one to check the work; and put cost-per-lead reporting in the role's definition from day one so the benchmarking problem never arises. A one-off audit is still useful here — it hands the new hire a measured baseline instead of a blank page.
If an agency wins
The scenario: spend below the salary-justifying line, need for cross-account test data, cover, and a fast start.
What to demand from any agency, GrowthLine included: published fees; your ownership of the Google Ads account; monthly reporting against cost per lead, not clicks; and landing pages built to a measured speed budget.
GrowthLine is a PPC agency that only takes lead-generation businesses, and the person who runs the account is the person you speak to. What full PPC management includes and how a lead generation agency engagement is shaped are both documented; if you are shortlisting, the comparison with criteria published is at best PPC agencies in the UK.
The third option: freelancer or hybrid
A good freelancer beats both models at low spend and low workload — that comparison is written up at freelance Google Ads specialist vs agency. The hybrid also works: an in-house owner-operator running the account day-to-day with a periodic external check — a free PPC audit is built for exactly that.
PPC agency vs in-house FAQs
What is the difference between inhouse and agency?
An in-house PPC manager is your employee: one salary, full-time attention on one account, inside your business's daily context. An agency is a contracted team running your account alongside others: you buy a share of specialist attention, cross-account experience and continuity for a monthly fee rather than an employment package. The practical difference shows in five places — cost shape, time to start, hours on the account, breadth of test data, and what happens when it fails — which the criteria table on this page sets out row by row.
What are the benefits of working with a PPC agency?
Four benefits hold up to scrutiny: lower fixed cost than an employment package at typical SMB spend levels; a start measured in weeks rather than a recruitment cycle; test data drawn from many accounts instead of one; and continuity that does not take holidays or resign. Set against them honestly: an agency gives you a share of a specialist's week rather than all of it, and it cannot match an employee's daily immersion in your business. Whether the benefits outweigh that depends mostly on spend and workload — the decision flow on this page walks it through.
How much does a PPC agency cost compared with an in-house hire?
An in-house hire costs a full employment package — salary plus employer National Insurance, pension, tools, training and recruitment — committed for the year; an agency costs a monthly management fee, which at small-to-mid ad spends is normally a fraction of that package. No honest single figure exists for either side: salaries vary by region and seniority, and most agencies do not publish their fees. GrowthLine's management fees are published in full on the pricing page, so at least one side of the comparison can be checked exactly.
How much does an in-house PPC manager earn in the UK?
This page does not quote a salary figure, because no verified UK salary source sits behind it and third-party averages date too quickly to trust on a page built to stay accurate. What is stable enough to say: a competent PPC manager commands a full professional salary, employer National Insurance and pension add materially on top, and live job-board listings for your region are the only current benchmark worth using. Compare that whole package against a published management fee — not the salary line alone.
Why would someone choose an agency role instead of an in-house role?
That is a career question rather than a buying one: marketers often choose agency roles for variety of accounts and faster skills development, and in-house roles for depth in one business and closer commercial ownership. If you are an employer deciding which to buy rather than which job to take, the rest of this page is the comparison you want.
What is the difference between agency and in-house PR?
The same structural trade-off applies in PR as in PPC: in-house means a dedicated employee with deep single-brand context; agency means shared specialists with broader relationships and no employment overhead. This page covers the PPC version of the decision — the criteria table above is the detail.
Decide from a measured baseline
Whichever model you choose, the first step is the same — a free audit of the current account, findings in writing, usable to brief a new hire or to hold an agency to account (this one included).