B2B marketing agency: what it does, what it costs and how to choose the right one

Switching agencies every year is expensive. Learn what a B2B marketing agency does, how pricing models work and which questions to ask before you sign.

An industrial equipment company switched agencies three times in two years. The first one produced beautiful posts, but nobody knew whether they brought in customers. The second promised leads and delivered hundreds of inquiries from students and tire-kickers. The third started strong, then reshuffled the account team after three months, and nobody understood the business anymore.

In the end, the owners concluded that "marketing doesn't work in our industry." It wasn't true. What failed was the selection, the scope and the way they worked with each agency.

That story is more common than it looks. Hiring a B2B marketing agency is a strategic decision, yet many companies treat it like buying a commodity service. In this guide, you will learn what a B2B agency does, how it compares with a consultancy, a freelancer and an in-house team, how pricing models work, which criteria to use when choosing, which questions to ask in the pitch meeting and how to work well with an agency after you sign.

What does a B2B marketing agency do?

A B2B marketing agency helps companies that sell to other businesses get found, understood and chosen by the right buyers. In practice, it plans and executes positioning, content, media, website, lead generation and sales enablement work, built for long buying cycles and decisions that involve several people.

The most common services are:

• Strategy and positioning: diagnosis, ideal customer profile, value proposition and messaging.
• Brand: visual and verbal identity, brand guidelines, sales decks.
• Website and landing pages: structure, copy, design, development and conversion optimization.
• Content: blog, LinkedIn, newsletters, guides, video, case studies.
• SEO and AI visibility: optimization for Google and for assistants such as ChatGPT.
• Paid media: Google Ads, LinkedIn Ads, Meta Ads, retargeting.
• Automation and CRM: nurture flows, sales integration, performance dashboards.
• Sales enablement: sales materials, talk tracks, training, proposals.

Not every agency does all of this, and not every company needs all of it. The starting point is understanding which problem needs solving.

On Google Trends, US interest in "B2B marketing agency" is steady, while more specific searches like "B2B industrial marketing agency" grew about 80% over the past twelve months. Buyers are looking for partners who understand their sector, not generalists.

How is a B2B agency different from a traditional agency?

The difference lies in how the end customer buys. In B2C, one person decides, often on impulse, in a short cycle. In B2B, several people decide together, using rational and emotional criteria, in a cycle that can take months.

That changes almost everything:

• Messaging has to address risk, return, safety and competence, not just desire.
• Content has to help the buyer decide and persuade colleagues.
• Channels include LinkedIn, search, events, outbound and relationships, beyond social media.
• Metrics go beyond likes and clicks: opportunities, sales cycle, cost per customer.
• Sales integration is mandatory, because leads rarely buy straight from the website.

An agency used to retail and consumer brands can do excellent work in that world and still struggle in B2B. Ask specifically about experience with complex sales.

Agency, consultancy, freelancer or in-house team: which should you choose?

Each model solves a different problem. The right choice depends on what your company lacks: direction, execution or both.

• Marketing consultancy: focused on diagnosis, strategy, positioning and direction. Ideal when the company does not know exactly what to do, or does a lot without results. We cover the difference in marketing consulting vs. agency.
• Agency: focused on ongoing execution with a multi-disciplinary team. Ideal when direction is clear and production capacity is missing.
• Freelancer: focused on one specific deliverable, such as design, paid media or copywriting. Ideal for well-defined, one-off needs.
• In-house team: focused on day-to-day execution and deep business knowledge. Ideal for companies with steady volume and budget for several hires.

Many mid-size companies combine models: a consultancy or strategic agency sets direction and handles specialized work, while an internal owner keeps daily operations running. Others use a single partner that combines strategy and execution, which reduces the risk of direction getting lost along the way.

When does it make sense to hire a B2B marketing agency?

It makes sense when the company has a clear growth goal, an offer that works and lacks the in-house skills or time to build marketing properly. The most common signs:

• The company relies on referrals and wants predictability.
• Marketing exists, but nobody knows what it produces.
• The brand looks smaller than the business really is.
• A new offer, new market or expansion is about to launch.
• Sales complains about lead volume or lead quality.
• The founders are doing marketing in their spare time.

On the other hand, an agency will not fix problems that are not marketing problems: a product that underdelivers, pricing out of line with the market, poor service or no capacity to serve more customers. An agency may still generate demand, but it will expose those problems faster.

How much does a B2B marketing agency cost?

Cost depends on scope, team seniority, deliverable volume and who pays for media. More useful than hunting for an average price is understanding pricing models and calculating what your company can and should invest.

Common pricing models

• Monthly retainer: a fixed monthly fee for a defined scope. The most common model for ongoing work.
• Project fee: a fixed price for a deliverable with a beginning and an end, such as a repositioning, a website or a diagnostic.
• Hourly: billing for hours worked. Common with consultancies and ad hoc requests.
• Percentage of media spend: the agency charges a share of ad spend. It can create an incentive to increase spend unnecessarily.
• Performance or hybrid: a base fee plus bonuses tied to targets. It requires well-defined metrics and reliable tracking.

What goes into the total budget

• The agency fee.
• Paid media, usually paid directly to the platforms.
• Tools: CRM, automation, analytics, design.
• Production: photo, video, events, print.

How much to invest in marketing

One market reference: Gartner's annual CMO Spend Survey, which covers large companies, found average marketing budgets of about 7.7% of company revenue in 2024. Smaller and fast-growing companies often need a different proportion, higher or lower, depending on margins and ambition. What matters most is setting the budget from business goals, not from whatever cash is left over.

How do you choose a B2B marketing agency?

Choose for the ability to understand your business and connect marketing to revenue, not for the prettiest portfolio or the lowest price. Ten criteria help you compare proposals fairly.

1. It starts with diagnosis

A good agency asks questions before proposing solutions. If the proposal arrives fully formed before anyone understands your business, be wary. See what a solid diagnostic looks like in a serious marketing diagnosis.

2. It has complex-sale experience

Ask for B2B client examples, ideally with cycles and deal sizes similar to yours.

3. Case studies show problem, decision and result

A useful case study explains the challenge, what was done and what changed, with numbers where possible. A portfolio of pretty assets does not prove strategic ability.

4. It talks about positioning, not just channels

If the conversation starts and ends with "let's run ads and post content," the foundation is missing. We explain why in our guide to brand positioning.

5. It connects marketing and sales

Ask how the agency tracks what happens after a lead arrives: CRM, qualification, opportunities, closed deals.

6. Its metrics are business metrics

Reach and clicks matter, but the agency should commit to indicators such as qualified leads, cost per opportunity and contribution to revenue.

7. You know who will do the work

Find out who is in the pitch and who will run your account day to day. Ask about seniority and team turnover.

8. The scope is clear

The proposal should state what is included, what is not, how many deliverables, on what timeline and with how many revision rounds.

9. It balances short and long term

Quick-win campaigns and brand building should move together.

10. The chemistry works

B2B marketing is a partnership. If communication is already hard before you sign, it rarely gets better afterwards.

Which questions should you ask in the agency pitch meeting?

Bring these to the first conversation:

• What do you need to know from me before building a proposal?
• Which B2B clients do you serve today, and what results did you achieve?
• How do you define a qualified lead?
• How do you track what happens after a lead reaches sales?
• Who will manage my account day to day?
• What do you expect to deliver in the first 90 days?
• Which reports will I receive, and how often?
• What happens if results do not show up?
• Who owns the ad accounts, logins, files and content you produce?
• How does contract termination work?

The ownership question looks like a detail, but it prevents a lot of pain. Ad accounts, domains, websites and social profiles should be registered to your company.

How do you compare agency proposals side by side?

Agency proposals are rarely comparable at first glance. One includes a website, another does not. One bills media separately, another bundles it. One promises 20 posts a month, another proposes a content strategy built on four in-depth articles. To compare them fairly, put every proposal on the same scorecard.

Score each agency from 1 to 5 on:

• Understanding of the problem: does the proposal describe your challenge in your words, or recycle boilerplate?
• Logic of the solution: is it clear why each deliverable is included and how it serves the goal?
• Proven experience: do the case studies show context, decisions and results?
• Team: do you know who will do the work and how senior they are?
• Metrics: are the proposed indicators business outcomes or just activity?
• Scope and timeline: is it clear what is in, what is out and when each piece happens?
• Total cost: adding the fee, media, tools and production, what will you invest per month?
• Relationship: how has the experience been so far, in conversations and responsiveness?

Add the scores, but do not decide on the total alone. One very weak item, such as a poor grasp of the problem, usually outweighs several strong ones. Also talk to at least one current client of each finalist. Ask what works well and what could be better. That ten-minute call reveals more than any pitch deck.

What should you expect in the first 90 days with an agency?

The first three months define the relationship. Knowing what is normal at each stage prevents frustration on both sides.

Month 1: immersion and diagnosis

The agency interviews founders, sales, customer service and customers, analyzes competitors and reviews the website, channels and existing data. There is little visible output and a lot of understanding. If an agency skips this phase and starts producing right away, the risk of rework goes up.

Month 2: foundation

With the diagnosis in hand, the agency defines or refines positioning and messaging, sets up data tracking, reviews or builds landing pages and prepares the first campaigns and content. This is the month the foundation gets built.

Month 3: first launches and first data

Campaigns are live, content is published, leads are arriving and the first numbers are ready to analyze. It is still early for firm conclusions about content and SEO, but you can already evaluate paid media, landing pages and lead quality.

After 90 days, you should have a documented strategy, a working technical foundation, first results measured and a clear plan for the next quarter. If none of that exists, it is time for a frank conversation.

When is it time to switch agencies?

Switching agencies has a cost: transition time, a new learning curve and the risk of losing what was built. So it helps to separate temporary frustration from structural problems.

Signs a switch may be necessary:

• After six months, there is still no clarity about what marketing contributes to the business.
• The agency cannot explain why results are below expectations and does not propose changes.
• The team on your account keeps changing and knowledge keeps getting lost.
• Reports show only activity and vanity metrics.
• The strategy stayed the same even when the business changed.

Before switching, have a direct, data-driven conversation about what needs to change. Often the issue is scope, lack of access to sales data or the absence of an internal owner. If the conversation does not fix it, plan the transition: make sure logins, files and history sit with your company, and document what worked so the next partner does not start from zero.

Should a US company consider an agency based outside the US?

More US companies are working with nearshore partners in Latin America, and the reasons go beyond cost. Overlapping time zones make collaboration practical, many teams work fluently in English and some bring experience that is hard to find locally, such as reaching Spanish- and Portuguese-speaking audiences.

The same selection criteria apply, with a few extra questions. Does the agency produce native-quality content in English, not translations? Does it know the US channels and directories that matter in your industry, such as G2, Clutch and the trade publications your buyers read? Has it worked with US contracts, payment terms and expectations around responsiveness? Can it show US or international clients?

A good nearshore partner should feel like an extension of your team, not an offshore vendor. If the answers to those questions are solid, location becomes a detail, and sometimes an advantage.

What are the red flags when hiring an agency?

• Guaranteed results on a short timeline, without knowing the business.
• Volume obsession: "we'll generate a thousand leads," with no word about quality.
• A generic proposal that could fit any company.
• Vagueness about who actually does the work.
• Ad accounts and logins held in the agency's name.
• Reports full of vanity metrics such as likes and impressions.
• Pressure to sign before the problem is understood.

How do you work well with an agency after you hire it?

A good agency does not replace your company's involvement. The projects that work best share a few practices:

• One internal owner with authority to approve and access to leadership.
• An onboarding immersion in which the agency talks to founders, sales, customer service and a few customers.
• Clear, agreed goals with short- and long-term indicators.
• A review rhythm: monthly results meetings and quick weekly check-ins.
• Access to sales data, so marketing knows what turns into revenue.
• Realistic timelines. The first 90 days are usually about building foundations. Consistent content and SEO results come later.

Strategy also evolves. At Royal American Group, marketing came to follow the company's real operating calendar, with dedicated pages for each event, an e-book as a lead magnet and an institutional video, instead of a rigid list of deliverables. At Didáctica Sempre, the project began with a landing page and CRM, and journey analysis showed the main issue was how the brand presented itself. The scope changed because the diagnosis changed.

How do you measure a B2B marketing agency's work?

Combine activity, marketing and business metrics, and evaluate in three-month cycles.

• Activity: deliverables on time, campaigns live, content published.
• Marketing results: qualified traffic, leads, qualified leads, cost per lead.
• Commercial results: opportunities, proposals, closed deals, cost per customer.
• Brand: branded search, mentions, presence in AI answers, customer perception.

For a detailed playbook of channels and metrics, see our guide to B2B lead generation. To track how your company shows up in AI-driven search, see our guide to generative engine optimization.

How Comelato Company works with B2B companies

Comelato Company is a positioning, communication and growth consultancy for B2B companies. We combine the strategic direction of a consultancy with the execution capacity of an agency, with close senior guidance.

We work in four stages: diagnosis, positioning and narrative, planning and execution, and optimization. Execution covers websites, landing pages, LinkedIn, Instagram, content, paid media, email, automation and sales materials, all tied to the same strategy.

That is how Envoy moved beyond referrals to more than 100 new conversations in 30 days, with demand for higher-value projects. We work with companies in Brazil and the United States, and with Brazilian companies entering the US market. If you are evaluating agencies or rethinking your marketing, book a diagnosis. A good first conversation will show whether it makes sense to work together.

Frequently asked questions about B2B marketing agencies

What is the difference between a marketing agency and an advertising agency?

An advertising agency traditionally handles campaigns and creative for media. A marketing agency has a broader scope that includes strategy, digital channels, content, data and, in B2B, sales integration.

How long does it take for an agency to show results?

Paid media can show signals within weeks. Content, SEO and brand take three to six months to produce consistent results. Be skeptical of guaranteed results in month one.

Should you hire a small or a large agency?

It depends on what you need. Large agencies offer structure and many specialties. Smaller agencies and consultancies tend to offer closer, more senior attention. The most important criterion is experience with problems like yours.

Should an agency contract have a minimum term?

A minimum of three to six months is common and reasonable, because the first months are about setup. Very long contracts with no performance-based exit clause deserve scrutiny.

Does the agency need experience in my industry?

It helps, but it is not essential. More important than sector knowledge is the ability to ask the right questions and experience with complex sales. A good agency learns your market quickly during the diagnostic phase.

Can I hire an agency just for paid media?

Yes, as long as your messaging, landing pages and follow-up process are already in good shape. If they are not, media will simply send more people to an experience that does not convert. In that case, start with a diagnostic and fix the foundation before increasing ad spend.

Who should own the agency relationship inside the company?

Someone with access to leadership, solid business knowledge and the authority to approve work. In smaller companies, that is often a founder or the head of sales. What matters is having a person with dedicated time for the relationship, not someone squeezing marketing between other emergencies.

What should be in a monthly agency report?

A short summary of what was done, what happened and what will change. The numbers should follow the funnel, from reach and traffic to leads, opportunities and closed deals, with a comparison against the previous months. Most importantly, the report should end with decisions and next steps, not just charts.

By Júlia Comelato, founder of Comelato Company, a positioning, communication and growth consultancy for B2B companies, based in São Paulo, Brazil. Meet the team.