Most marketing leaders make the agency-vs-in-house decision once and stick with it for years. That's almost always the wrong call — the right answer changes as your brand grows, and the most successful link-building programmes evolve through three phases: agency, hybrid, then mostly in-house with strategic agency support.
This guide gives you the comparison on the dimensions that matter, the stage-by-stage right answer, and what the hybrid model looks like when you reach scale.
The five-line comparison
| Dimension | Agency | In-house |
|---|---|---|
| Cost per link (typical) | £300–£1,200 | £800–£2,500 |
| Time to first placement | 3–6 weeks (relationships exist) | 3–6 months (building relationships) |
| Scalability (links per month) | 3–25+ (instantly scalable) | 1–15 (capped by team size) |
| Control over strategy | Medium | High |
| Brand / category expertise | Lower (generalist) | Higher (specialist) |
| Risk of low-quality work | Variable (depends on agency) | Low (incentives aligned) |
Why agencies are cheaper per link
Link-building agencies charge less per link than in-house teams produce them at, despite the markup, because of three structural advantages:
- Existing journalist relationships. A 5-year-old agency has hundreds of warm contacts at tier-1 publications. An in-house team starts cold. Cold pitches have a 1–3% success rate; warm pitches have a 10–25% success rate. The agency does 5–10× the work-per-placement that in-house does.
- Spread overheads. A senior PR practitioner's salary is amortised across 30 client accounts at the agency. In-house, the same salary serves one company.
- Process maturity. Agencies have refined briefing, anchor planning, outreach and reporting workflows over thousands of placements. In-house teams reinvent these from scratch.
The math: a Growth-tier agency at £4,000/month delivering 6 placements works out to £667/link. The equivalent in-house function — one senior PR lead at £75K/year fully loaded, producing 8 placements/month after 12 months of relationship building — works out to £780/link. And that's after the in-house team has reached steady state, which most never do because they get disbanded in months 6–12 when output is still too low to justify the cost.
Where in-house wins
Despite agency's structural cost advantage, in-house teams meaningfully beat agencies on three dimensions:
1. Brand and category expertise
An in-house team that's been in the business for two years knows your product, customer, competitors, and category nuances. They write better pitches, spot relevant journalist requests faster, and avoid the off-brand placements agencies sometimes deliver to hit volume targets. For brands in technical or specialist niches (B2B SaaS, regulated finance, healthcare, legal), in-house expertise can outweigh the cost premium.
2. Strategic alignment
Agencies optimise for placement count and DA — the metrics that justify their renewal. In-house teams optimise for whatever the company actually cares about (lead pipeline, brand defensibility, executive thought leadership). The targets sound similar; the priorities they produce in week-to-week decisions are different.
3. Long-term institutional knowledge
An in-house team that's run PR for five years carries the institutional memory of every campaign, every relationship, every angle that worked. An agency loses that institutional memory the moment you switch agencies (which you will eventually).
The right answer by stage
Stage 1: Pre-£500K marketing budget — agency
The fixed cost of a competent in-house PR / link-building hire (£55K–£85K all-in) is too large a share of marketing spend at this stage. Plus, you don't yet have the strategic clarity needed to brief an in-house function effectively. Use an agency, build a simple brief, focus on quality over volume.
Stage 2: £500K–£2M marketing budget — agency + selective in-house
Marketing has scaled enough to justify a single in-house PR hire (often a senior practitioner at £65K–£85K) who handles strategic narrative, executive thought leadership, and the highest-value campaigns. The agency continues to handle core link velocity. The in-house person becomes the strategic owner; the agency becomes execution capacity.
Stage 3: £2M+ marketing budget — in-house with agency support
Now the in-house team is 2–4 people: a head of PR, a senior writer, an outreach lead, sometimes a dedicated digital PR specialist. They handle most volume in-house. Agency relationships continue but become specialist — for one-off campaign formats (interactive tools, definitive research) the in-house team can't produce, or for white-label work in adjacent categories.
What in-house gets wrong (and how to avoid it)
Three patterns kill more in-house link-building functions than budget cuts ever do:
- Hiring too junior. A junior PR or content marketer cannot do effective journalist outreach in their first year. They burn 12 months learning fundamentals. Hire senior — minimum 5 years' direct PR / link-building experience.
- Measuring on activity not outcomes. If the in-house team is measured on "pitches sent per week", they'll send pitches. If they're measured on "placements landed at DA 70+", they'll land placements. Set the target on the outcome, not the activity.
- Disbanding too early. The function takes 9–18 months to become productive. Most CFOs lose patience at month 6 when output looks low compared to the agency they replaced. Either commit to 18 months or don't start.
The hybrid model in detail
Most established UK brands settle on a hybrid model that looks like:
- 1 in-house senior PR lead (Head of PR, Director of Comms) — owns strategy, executive thought leadership, brand-defining campaigns
- 1 in-house content / outreach contributor — supports asset creation and journalist outreach for in-house campaigns
- Retained agency at £4K–£8K/month — handles core monthly link velocity (5–10 placements), provides specialist capabilities the in-house team can't (digital PR campaigns with interactive assets, white-label work, regional press networks)
- Occasional freelance specialists — for one-off needs (data scientist for a research campaign, designer for a interactive build, regional PR for a specific market)
This model typically costs £180K–£280K/year all-in (in-house salaries + agency retainer) and delivers 15–25 high-quality placements/month — outperforming either pure-agency or pure-in-house at the same budget.
The 30-second summary
- Agencies are cheaper per link at low-to-medium volume because of existing journalist relationships and spread overheads
- In-house teams win on category expertise, strategic alignment, and long-term institutional knowledge
- Below £500K marketing budget: agency. £500K–£2M: hybrid. £2M+: in-house with specialist agency support
- In-house functions take 9–18 months to become productive — commit fully or don't start
- The mature model for established brands combines an in-house team with a retained agency, splitting strategic ownership from execution capacity
Need help deciding which stage you're at?Book a call — we'll walk through your current setup, growth plans and budget, and tell you honestly whether you should be working with an agency, building in-house, or doing both.