Should You Hire a Junior Marketer or Work With an Agency? A Straight Answer for Trades Businesses

You've decided you need marketing help. The question every trades business owner asks next is the same: do I hire someone in-house or work with an agency? Most of the advice online is either vague or written by people trying to sell you one option. Here's the straight version, based on running marketing for dozens of South London trades businesses.

The real cost of a junior marketer in London in 2026

A genuinely useful junior marketer in London — someone who can actually run Google Ads, write copy, manage a Google Business Profile and touch a website — costs £32,000–£40,000 a year. Add pension, National Insurance, holiday cover, sick leave, software subscriptions (SEMrush, Canva Pro, email tools, analytics), a laptop, and the time you'll spend managing them, and the real total is closer to £48,000–£55,000 a year.

That's roughly £4,000–£4,500 a month. And it buys you one person, at the start of their career, with limited experience in your specific niche. They will be enthusiastic. They will also be learning — often on your budget.

What a specialist agency actually costs

For a trades business, a good specialist agency runs somewhere between £1,500 and £4,000 a month depending on scope. For that you get a small team — a strategist, a paid media specialist, a content and SEO person, someone on the website — none of whom are learning your basics on your dime, all of whom have already made and fixed the mistakes on other trades accounts.

Roughly speaking, an agency at £3,000/month costs the same annual budget as a junior hire but gives you three to five specialists instead of one generalist.

Where a junior hire genuinely wins

• You have consistent, high-volume daily marketing tasks — content creation, social posting, community management — that need dedicated hours.
• You want deep, in-the-business knowledge — someone on-site who understands your services, your team and your customers intimately.
• You already have a senior marketer or agency setting the strategy, and you need someone to execute it day-to-day.
• You're big enough to give them a real career path and mentorship. A junior without senior guidance almost always plateaus within 12 months.

Where an agency genuinely wins

• You need results in 30–90 days, not 12 months. A junior takes 6 months just to get up to speed.
• You need specialist skills across paid media, SEO, copy and web — no single junior does all four well.
• You want proven playbooks. A good agency has already tested what works for your trade in your area.
• You want flexibility. Scale up in busy seasons, scale down in quiet ones. You can't do that with a payroll hire.
• You don't have time or expertise to manage a marketer properly. An unmanaged junior is worse than no marketer at all.

A junior costs you a salary. An unmanaged junior costs you a salary and a year of missed pipeline.

The hybrid that quietly works best

For most South London trades businesses turning over £500k–£2m, the sweet spot is a specialist agency handling strategy, paid media, SEO and website work, plus a part-time in-house person (or an office manager with 5 hours a week protected) handling reviews, photos from finished jobs, social posts and community engagement. That combination gives you senior expertise where it matters and dedicated in-the-business presence where the agency can't reach.

The honest answer

If you're doing under £500k in revenue, don't hire a junior. You can't afford to carry someone through a learning curve, and you won't have time to manage them properly. Work with a specialist for 12–18 months, build a real pipeline, and only then think about bringing someone in-house to support what already works.

If you're above £1m and growing, the answer is usually 'both' — an agency to lead, and a dedicated in-house person to support. Rarely one or the other.

The businesses that get this wrong tend to hire cheap, ask for too much, and quietly lose 12 months of momentum. Get it right and marketing stops being the thing you dread on a Sunday evening and starts being the thing that quietly fills your calendar.