In-house SEO vs agency
for law firms

What this guide covers

1. The real cost of hiring in-house
2. What an agency actually costs
3. Side-by-side cost comparison
4. The skills gap problem
5. When in-house makes sense
6. When an agency makes sense
7. The hybrid approach
8. What to look for in an agency
9. Red flags to watch for
10. How to decide for your firm

The real cost of hiring in-house

Most managing partners who consider bringing SEO in-house think about salary. That’s only part of the picture. The true cost of an in-house SEO hire is 40-60% higher than the number on the job advert.

A mid-level SEO specialist with 3-5 years of experience — the minimum you’d want for a law firm — commands a salary of £35,000-55,000 in 2026, depending on location. London skews higher. A senior SEO manager with legal sector experience (they do exist, though they’re rare) starts at £55,000 and can reach £70,000.

Now add the costs nobody mentions in the initial business case:

That’s £4,977-7,937 per month for one person. And that person still needs to do everything: technical SEO, content writing, keyword research, link building, local SEO, Google Business Profile management, analytics, and reporting.

There’s also a hidden cost that doesn’t appear on any spreadsheet: opportunity cost. When your SEO person is on holiday for two weeks, nothing happens. When they’re sick, nothing happens. When they resign and you spend three months recruiting a replacement, nothing happens. An agency has a team behind the work. If one person is away, the work continues.

Recruitment itself is a gamble. SEO interviews are notoriously difficult to assess because the results of someone’s work take months to appear. A bad hire might not become obvious until six months in — by which point you’ve spent £30,000 and your SEO programme is no further forward than where it started.

What an agency actually costs

Agency pricing for law firm SEO in the UK falls into predictable tiers. We’ve covered this in detail in our full SEO cost guide, but here’s the relevant summary:

For the price of one mid-level in-house hire, most firms can afford a Growth or Market Leader programme from a specialist agency. At £2,500 per month (£30,000 per year), you’re paying less than half the true cost of an in-house hire — and you’re getting a team, not a single person.

That team typically includes a strategist who plans your keyword targeting and content calendar, a content writer (often with legal sector experience or access to legal reviewers), a technical SEO who handles site audits, schema markup, page speed, and crawl issues, and a link builder who earns backlinks from relevant publications. Some agencies also include a dedicated account manager who acts as your single point of contact.

No individual hire at £45,000 per year has all those skills at a high level. It’s not a criticism of in-house SEOs — it’s just that SEO in 2026 requires specialisation across several distinct disciplines. Asking one person to be excellent at all of them is like asking one solicitor to handle conveyancing, immigration, and personal injury with equal expertise.

Side-by-side cost comparison

Let’s put real numbers next to each other. This comparison assumes a mid-size UK law firm with two offices, three practice areas, and a goal of increasing organic enquiries by 50% over 12 months.

The numbers don’t tell the whole story, but they set the frame. For most firms under 30 fee earners, the agency model costs less and delivers more. The exceptions are worth understanding, and we’ll cover those below.

The skills gap problem

SEO in 2026 is not one skill. It’s at least four distinct disciplines, and each one takes years to master.

Technical SEO involves site architecture, crawl optimisation, Core Web Vitals, schema markup, JavaScript rendering, indexation management, and server-side configuration. A good technical SEO understands how Googlebot processes your site at a code level. This person thinks in log files and HTTP status codes.

Content strategy and creation means keyword research, search intent analysis, content briefs, writing (or managing writers), on-page optimisation, and content performance tracking. For law firms, this also means understanding SRA advertising regulations and producing content that meets Google’s YMYL (Your Money or Your Life) quality bar. Legal content done badly is worse than no content at all.

Link building and digital PR requires relationship-building with journalists and editors, creating link-worthy assets, outreach at scale, and knowing which links help versus which ones risk a Google penalty. It’s a separate career path from technical or content SEO — the best link builders are part marketer, part PR professional.

Local SEO covers Google Business Profile optimisation, citation building, review management, local link acquisition, and geo-targeted content. For high-street and regional firms, local search visibility is often the single biggest source of new enquiries.

When you hire one person, they’ll be strong in one or two of these areas. The rest gets done at a basic level — or not at all. We see this pattern repeatedly when firms come to us after trying the in-house route: the technical SEO hire produced no content, or the content-focused hire never touched the site’s technical problems, or nobody did any link building because it wasn’t in their skill set.

An agency builds a team around these specialisms. Each person does the work they’re best at, every month. That’s the structural advantage — not clever marketing, just how specialist teams work.

When in-house makes sense

In-house SEO is the right choice for some law firms. Pretending otherwise would be dishonest. Here’s when it genuinely works:

Large national firms with 30+ fee earners. At this size, the volume of content, the number of practice areas, and the complexity of multi-location SEO justifies a dedicated team — not a single hire, but a team of two or three people. One person handles content and strategy, another handles technical work, and a third manages local SEO and reporting. This costs £120,000-180,000 per year in total, which is reasonable for a firm billing millions annually.

Firms with a constant stream of content needs. If your firm publishes legal updates weekly, produces client guides for every practice area, and needs rapid-turnaround content for emerging legal issues (new legislation, landmark cases), an in-house content person who knows the firm intimately has a speed advantage. They can talk to fee earners directly, turn conversations into published articles the same week, and respond to time-sensitive topics faster than an external team.

Firms building a broader internal marketing function. If you’re hiring a marketing director, a content manager, and a PPC specialist alongside the SEO hire, the in-house model works because each person covers their area properly. SEO as part of a well-resourced internal marketing department is a solid setup. SEO as a lone hire bolted onto an office manager’s responsibilities is not.

Firms where data sensitivity is a genuine constraint. Some firms handle matters where even anonymised data about client enquiry patterns, practice-area conversion rates, or geographic demand could be sensitive. An internal hire keeps that data inside the firm. This is genuinely rare — most SEO data is about website performance, not client information — but it’s a real consideration for certain firms.

The common thread: in-house SEO works when you can build a proper function around it. One person, alone, without a team or tooling budget, is set up to fail.

When an agency makes sense

For most UK law firms — and “most” here means roughly 80% of the firms we speak to — an agency is the better choice. Here’s why.

Firms with fewer than 30 fee earners. This covers the majority of UK solicitor practices. At this size, the SEO budget typically sits between £1,500 and £4,000 per month. That buys a serious agency programme but wouldn’t cover half the cost of a competent in-house hire. The maths is straightforward.

Firms entering SEO for the first time. If you’ve never invested in SEO before, starting with an agency gives you immediate access to experience, established processes, and existing relationships with content writers and link sources. Building this from scratch with an in-house hire takes 6-12 months before meaningful work even begins. An agency with legal sector experience can start executing within weeks because they’ve already solved the problems your hire would need to figure out from zero.

Firms that need results within a defined timeline. SEO takes time regardless of who does it, but an agency with a proven process for legal clients can move faster than a new hire learning your industry, your website, and SEO best practice simultaneously. If you need measurable improvement in organic visibility within six months, an experienced agency is the lower-risk option.

Firms that want to test SEO before committing to a hire. A 6-12 month agency engagement is a good way to prove the ROI of SEO for your firm before investing in a permanent employee. If the agency generates a 3:1 return over 12 months, you have the data to justify a long-term investment — whether that’s continuing with the agency, hiring internally, or a hybrid of both.

Firms that tried in-house and it didn’t work. This is more common than you’d think. The hire was strong in content but couldn’t handle technical issues. Or they were technically skilled but produced no content. Or they did both but had no ability to build links, so rankings plateaued. An agency provides the team that one person couldn’t be.

The hybrid approach

The binary choice of in-house vs agency is a false one for many firms. A hybrid model takes the best parts of both.

The structure looks like this: you hire an internal marketing coordinator or content manager at £28,000-38,000 per year. This person knows your firm, has direct access to fee earners, and handles day-to-day marketing tasks. They publish blog posts, manage social media, update the Google Business Profile, brief external suppliers on firm news, and act as the internal point of contact for all marketing activity.

Alongside this, you engage an agency for the specialist SEO work: strategy, technical audits, content optimisation, link building, and monthly reporting. The agency handles the work that requires deep expertise and expensive tooling. The internal person handles the work that requires firm knowledge and daily availability.

The cost of this model: £28,000-38,000 for the internal hire plus £1,500-3,000 per month for the agency. Total: £46,000-74,000 per year. That’s comparable to a single mid-level in-house SEO hire — but you get a marketing generalist who knows your firm and a team of SEO specialists who know their craft. Both sides are doing what they’re best at.

The hybrid model also solves the knowledge-loss problem. If your internal person leaves, the agency retains the SEO strategy, keyword data, and performance history. If you switch agencies, the internal person retains the firm knowledge and content relationships. Neither departure cripples your programme.

For firms with 15-30 fee earners, this is often the ideal setup. You get internal ownership of your marketing without the risk and cost of expecting one hire to cover every SEO discipline.

What to look for in an agency

If you go the agency route — or the hybrid route with an agency partner — choosing the right one matters more than the decision between in-house and external. A bad agency is worse than no agency, because they’ll waste your budget and may actively damage your site with poor-quality links or thin content.

Here’s what to evaluate:

Legal sector experience. An agency that works with law firms understands SRA compliance requirements, knows that legal content falls under Google’s YMYL standards, and has existing keyword research and competitor data for your practice areas. They won’t need three months to understand your industry. Ask for specific examples: which firms have they worked with, what results did they achieve, and can you see the actual data?

Named team members. You should know who is doing the work. Not just your account manager — the actual people writing your content, running your technical audits, and building your links. If the agency can’t tell you who is working on your account, the work is likely outsourced to freelancers the agency itself barely manages.

Clear monthly deliverables. Before signing, you should have a written list of what you’ll receive each month. How many content pieces. Which technical tasks. What reporting format. How often you’ll speak with your account manager. Vague promises of “ongoing optimisation” tell you nothing. Legitimate agencies specify their outputs because they’ve planned the work before quoting.

Transparent reporting tied to business outcomes. Monthly reports should track rankings and organic traffic, but the bottom line is enquiries. How many phone calls and form submissions came from organic search this month? If the agency can’t answer this question, their reporting is incomplete. Ask how they track attribution — call tracking and form tagging are standard in 2026.

Reasonable contract terms. A 3-month minimum commitment is fair — SEO needs time to work. Monthly rolling after that, or a 6-month term with a performance review clause. Be cautious of 12-month lock-ins with no exit mechanism. The agency should be confident enough in their work to let results justify the relationship, not a contract.

Willingness to explain their process. Ask them how they approach link building. Ask them how they decide which keywords to target. Ask them what technical SEO issues they commonly find on law firm websites. If they can explain clearly in plain English, they know their craft. If they deflect with jargon or claim proprietary methods, that’s a warning sign.

Red flags to watch for

Whether you’re evaluating an agency or interviewing an in-house candidate, certain patterns should make you pause.

Guaranteed rankings. Nobody can promise you’ll rank number one for a specific keyword. Google’s algorithm evaluates hundreds of signals and changes regularly. Any agency or candidate who guarantees a specific position is either lying or planning to target keywords so obscure that ranking is meaningless. “Specialist bespoke matrimonial solicitor Tunbridge Wells” — sure, you’ll rank for that, but nobody searches for it.

Prices that seem too low. An agency offering a full SEO programme at £300-500 per month cannot be doing meaningful work. The tool costs alone eat a significant portion of that budget. At those prices, you’re getting automated reports, some directory listings nobody checks, and maybe a template blog post once a month. You’ll spend more in 12 months achieving nothing than you would have spent in six months with a proper agency that charged appropriately.

No SRA awareness. If an agency doesn’t mention SRA advertising rules in their pitch to a law firm, they haven’t worked with solicitors before and they haven’t done basic research about your regulatory environment. Legal content has specific compliance requirements around claims, testimonials, and how you describe your services. An agency that doesn’t know this will create content that puts your firm at regulatory risk.

Vague case studies. “We helped a law firm increase traffic by 300%.” From what baseline? Over what period? Did that traffic generate enquiries? What practice areas? What location? Case studies without specifics are meaningless. Good agencies show you the starting point, the work they did, the timeline, and the outcome in measurable terms.

Unwillingness to share what they’ll actually do. There is no secret formula in SEO. The fundamentals are well-documented: keyword research, quality content, technical health, backlinks, local signals. If an agency won’t explain their method because it’s “proprietary”, they’re either doing very little or doing something that could get your site penalised. Transparency should be a baseline expectation.

No mention of content quality. If the conversation is all about links and technical tricks with no discussion of content strategy, the agency’s approach is incomplete. Content is where law firm SEO is won or lost, because Google holds legal content to a higher standard under its YMYL guidelines. An agency that treats content as an afterthought will struggle to move the needle for your firm.

Offering to do everything. Be wary of agencies that bundle SEO with web design, social media, PPC, email marketing, and branding into one package at one price. SEO alone is a full-time discipline. An agency that claims to do everything well usually does nothing particularly well. Specialist focus is what produces results.

How to decide for your firm

Strip away the marketing language and it comes down to four questions.

What’s your annual SEO budget? If it’s under £50,000 per year, you can’t afford a competent in-house hire after you account for tools, training, NI, and pension. That same budget buys a strong agency programme with money left over. If it’s above £100,000, you can start thinking about building an internal team — but make sure it’s a team, not a solo hire.

How many fee earners does your firm have? Under 30, the volume of SEO work rarely justifies a full-time employee. The work comes in bursts — a technical audit takes a week, then it’s content for three weeks, then it’s a local SEO sprint. An agency distributes that work across specialists. Over 30, and particularly over 50, the constant demand for content, multi-location management, and ongoing optimisation starts to fill a full-time role (or two).

How quickly do you need to start? Recruiting an in-house SEO takes 2-4 months. Onboarding takes another 1-2 months. That’s up to six months before meaningful work begins. An agency can start auditing your site and building strategy within the first two weeks of engagement. If speed matters, an agency wins.

Are you prepared to manage an SEO hire? SEO is technical. Managing an SEO specialist requires someone in the firm who understands the work well enough to set objectives, evaluate output, and provide direction. If nobody in your firm knows what a canonical tag is or why page speed matters, you’ll struggle to get value from an in-house hire because you can’t assess whether they’re doing good work. An agency manages itself and reports results you can evaluate in business terms: traffic, rankings, enquiries.

For the majority of UK law firms — those with 5-30 fee earners, annual marketing budgets of £20,000-60,000, and no existing in-house marketing team — a specialist agency is the clearer path to results. The cost is lower, the expertise is broader, the risk is smaller, and the results typically arrive faster.

That doesn’t make in-house SEO wrong. For large firms with the budget and management capacity to build a proper marketing function, it works well. And for mid-size firms growing toward that scale, the hybrid model bridges the gap.

The worst option — and we see this repeatedly — is hiring one person at £40,000, giving them no tools, no training budget, no management support, and expecting them to match what a team of specialists delivers. That person burns out, leaves after 12 months, and the firm concludes that “SEO doesn’t work.” SEO works. The delivery model was the problem.

If you’re weighing these options and want a straightforward assessment based on your firm’s size, budget, and goals, book a free 30-minute call. We’ll walk through the numbers honestly — including telling you if in-house is the right choice for your situation.