Digital marketing vs. in-house marketing: which delivers better ROI for building-product brands?

• 13 Jan 2026|
• Digital Marketing|
• Posted by Martyn East

Digital marketing vs in-house marketing is a decision that directly impacts ROI for construction, building-product, and home improvement businesses. In most cases, a specialist digital marketing agency delivers better ROI due to greater expertise, faster execution, and lower total cost. Many businesses assume in-house is cheaper and offers more control, but in reality, this approach often leads to higher costs, slower growth, and missed opportunities.

This post compares both models directly: real costs, skills, scalability, and performance. By the end, you will know which approach makes commercial sense for your business right now.

What is a digital marketing agency?

A digital marketing agency manages and delivers marketing activity on behalf of businesses. At Purplex, we provide a full team of specialists covering search marketing, paid advertising, content, design, PR, video, and social media, giving you access to skills that no single in-house hire can match.

As a full-service advertising agency, we bring every discipline together under one roof. Campaigns run across multiple channels at the same time, with each element handled by a dedicated specialist. We manage strategy, execution, and reporting as a single, joined-up process focused on measurable results.

We also bring sector-specific expertise. Working across construction, building products, and home improvement, we understand the supply chain, specification process, trade audiences, and the media that influence buying decisions. That knowledge allows us to deliver campaigns that are commercially relevant from day one.

Request a marketing proposal

What is in-house marketing?

In-house marketing means hiring employees directly to run your marketing function. A typical setup for a mid-sized building-product business might include a marketing manager, a digital executive, and a content writer.

The team has strong product knowledge and is accessible daily. They understand your brand, your customers, and your internal processes.

The limitation is depth. One person cannot be a credible SEO specialist, PPC manager, PR writer, video producer, and paid social strategist simultaneously. In-house teams tend to be generalists by nature, covering the basics across many channels rather than excelling in any one area.

The real cost comparison: agency vs. in-house

This is where most businesses get the calculation wrong.

In-house appears cheaper until you add up the full cost.

The total cost of an in-house employee typically lands between 1.3 and 1.4 times their base salary. For a marketer on a £50,000 salary, the real annual cost to your business is closer to £65,000-£70,000 before you have even bought them a laptop.

Beyond salaries, you need to account for employer National Insurance at 13.8%, pension contributions, recruitment fees (often 15-25% of salary), training budgets, marketing software subscriptions, management overhead, and office space.

For UK SMEs, hiring an in-house marketing team can cost £320,000-£380,000 annually for just a four-person setup. That figure includes salaries for a manager, SEO specialist, content writer, and paid media expert, plus all on-costs including employer NI, benefits, tools, and training.

Compare that to agency costs in the UK market:

Core agency retainers covering SEO, social media management, and reporting run from £1,250-£3,500 per month. Full-service retainers combining PPC advertising, content marketing, automation, and strategy development range from £3,500 to £16,750 per month.

The gap is significant. A building-product business spending £4,000-£6,000 per month on an agency retainer is accessing a full team of specialists for less than the cost of two mid-level in-house hires.

Skills and expertise: where the gap really shows

Building-product marketing requires a wide set of technical skills. Search marketing, specification content, trade PR, paid advertising, and website conversion all require genuine expertise. Staying current with algorithm changes, platform updates, and buyer behaviour shifts is a full-time job in itself.

In-house teams are stretched.

In-house teams tend to be more generalist-focused, with their skills limited to those of the individual. When a campaign needs PPC expertise, a content writer fills the gap. When SEO needs technical attention, the marketing manager reads a few articles and attempts a fix.

Search engine optimisation sits at the core of effective digital marketing, yet many businesses struggle to apply it consistently or correctly. Strong SEO requires a joined-up approach that combines technical performance, content relevance, and authority signals. An advertising agency brings accredited specialists in every discipline. Digital agencies already employ SEO specialists, PPC experts, content writers, and social media managers who stay up to date on platform changes and industry trends. For building-product brands specifically, sector knowledge accelerates results.

Partnering with a marketing agency that knows your products, your audience, and the supply chain has significant benefits. They know the technical jargon that makes your customers tick and produce design work, online content, and PR with focus, turning prospects into long-term customers.

Scalability: how each model responds to growth

This is where in-house marketing most visibly fails in growing building-product brands. Launching a new product range? Entering a new trade market? Running a campaign ahead of a major industry exhibition? An in-house team has a fixed capacity ceiling. More output means more headcount, more recruitment costs, and more management time. A digital marketing agency scales with you. Budgets can increase, channels can be added, and output can be accelerated without a new hire.

When working with a digital marketing agency, businesses pay for expertise as needed rather than maintaining fixed employment costs. This flexibility allows companies to scale services up or down based on seasonal demands or campaign requirements.

For building-product manufacturers with seasonal demand patterns, that flexibility directly protects margin.

Where in-house marketing works

In-house is not always the wrong answer. It performs well in specific scenarios:

• Large businesses with high-volume, routine content needs where volume output matters more than specialist depth
• Businesses with a dedicated brand guardian where protecting tone and identity daily requires constant internal oversight
• Companies with an existing strong team supplemented by agency specialists on specific channels

Many UK businesses implement a hybrid model, with an in-house marketing manager coordinating with external agencies. This structure combines internal brand knowledge with specialised external capabilities, creating an effective balance between cost control and marketing performance.

Where in-house marketing fails to build product brands

The failure points are predictable and consistent:

Depth across channels. One or two people cannot deliver credible search marketing, strong PR, effective PPC, and quality content simultaneously.

Speed of results. In-house teams learn on the job. An established digital marketing agency has repeatable processes, proven sector experience, and media relationships ready from day one.

Staff turnover risk. When your one digital expert resigns, your entire digital marketing programme stops. Recruitment takes weeks. Onboarding takes months. The campaign gap costs the pipeline.

Tool investment.

Your new marketing hire cannot work without the right tools. A modern marketing toolkit is not cheap, requiring subscriptions for SEO tools, a CRM system, email marketing platforms, social media schedulers, and design software. These can easily run into thousands of pounds a year for one person.

Real-world scenario: building-product manufacturer, £8m turnover

A mid-sized building-product manufacturer employs a marketing manager and a junior digital executive, with a combined salary and on-costs of approximately £110,000 per year. Add tools, training, and recruitment: closer to £130,000.

Output: a website that ranks for branded terms only, social media posting two to three times a week, and occasional email newsletters.

The same budget directed to a specialist advertising agency with building-products expertise buys an integrated team covering SEO, PPC, PR, content, and social. Within 12 months:

• Organic traffic grows through targeted search marketing and technical SEO
• Paid campaigns generate qualified trade leads at a measurable cost per enquiry
• PR activity builds brand authority across trade publications read by specifiers and buyers
• Content positions the brand as a sector authority

The ROI gap is not marginal. It is structural.

Why businesses choose Purplex over in-house marketing

Purplex Marketing is a full-service digital marketing and advertising agency built specifically for building-product manufacturers, construction businesses, and home improvement brands.

Purplex delivers sustainable growth for companies that manufacture and supply building products, helping to build brands, acquire customers, and successfully launch new products into the marketplace.

The team creates a bespoke digital strategy for each business, with a unique blend of content marketing, search engine optimisation, pay-per-click, social media, and email marketing.

Results speak plainly.

Our Newton Waterproofing case study shows how Newton Waterproofing achieved a 54% increase in vetted website leads within 12 months through a combined website, SEO, PR, and email marketing strategy.

lead generation case study for Plasloc

With a 94% customer retention rate, Purplex’s long-term clients see substantial year-on-year growth, and the agency actively encourages prospective clients to speak with existing ones before committing.

If you operate in construction, building products or home improvement, the decision becomes more nuanced. We have broken this down in detail in our guide to digital marketing vs in-house marketing for construction companies, including sector-specific costs, performance benchmarks and real campaign results.

Explore Purplex’s building products marketing services or request a proposal to see what an agency-led approach could deliver for your business.

Digital marketing vs in-house marketing, which delivers better ROI?

Below are the most common questions businesses ask when comparing digital marketing vs in-house marketing. These answers break down cost, performance and scalability so you can understand which approach delivers better ROI and makes the most commercial sense for your business.

Is a digital marketing agency cheaper than hiring in-house?

For most building-product businesses, yes.

Digital marketing agencies typically charge £960-£2,000 per month in the UK market, while building an in-house marketing team costs approximately £70,000-£85,000 annually

for a single marketer when full on-costs are included. A team of four in-house specialists costs significantly more. An agency retainer at a comparable spend delivers broader expertise and faster results.

What does a digital marketing agency do for building product companies?

A specialist advertising agency handles search marketing, PPC, PR, content, social media, email, and web development.

By bringing all key marketing disciplines under one roof, results are faster, messages are consistent, and costs are reduced.

For building-product brands specifically, the agency should also understand the sector: supply chain dynamics, trade press relationships, specification processes, and the buyer journey from installer to specifier.

When should a building-product brand keep marketing in-house?

In-house works well when you have a large, established team with genuine specialist depth across every channel, or when your brand requires daily content oversight that an agency model cannot replicate. For most building-product manufacturers with a turnover under £ 20 m, agencies provide access to specialists without the overhead costs of permanent staff, making the agency model the stronger commercial choice.

This entry was posted in Digital Marketing