Email Marketing Retainer vs Project Pricing: Which Model Is Right for Your Brand?

When you’re ready to bring in an email marketing agency, you’ll quickly encounter two distinct pricing models: monthly retainers and project-based pricing. On the surface, they seem like equivalent ways to buy the same thing — email marketing expertise. In practice, they’re meaningfully different in cost structure, risk, depth of service, and suitability for different brand stages.

This post gives you an honest, detailed breakdown of both models — including real pricing figures — so you can make an informed decision for your brand.

The Retainer Model: What It Is and How It Works

A monthly retainer is an ongoing engagement where you pay a fixed fee each month in exchange for a defined scope of services. The agency becomes an extension of your marketing team — planning, executing, and optimising your email programme continuously.

What a Retainer Typically Includes

At the starter tier ($1,000 USD/£800 GBP/A$1,400/C$1,350 per month):

4 campaigns per month (planned, written, designed, segmented, sent)
Core automation flows managed and optimised
Basic list segmentation
Monthly reporting
Deliverability monitoring

At the growth tier ($3,000–$6,000/month USD equivalent):

8–12 campaigns per month
Full automation stack built and continuously optimised
Advanced segmentation strategy
A/B testing programme
Monthly strategy calls and performance reviews
Deliverability management
Compliance management (CAN-SPAM, GDPR, Spam Act, CASL)
Retail calendar planning (Black Friday, Christmas, Boxing Day, EOFY, etc.)

At the scale tier ($8,000–$15,000+/month):

15+ campaigns per month across multiple audience segments
Dedicated account strategist and creative team
Weekly reporting and strategy
Advanced personalisation and lifecycle modelling
Full peak season planning and execution

The Economics of a Retainer

When you break down an agency retainer, you’re not just buying campaign execution — you’re buying continuous strategic attention, accumulated account knowledge, and proactive programme development.

An agency that has managed your account for 6 months knows your audience, your product calendar, your best-performing segment and creative combinations, and the seasonal patterns specific to your brand. That accumulated knowledge compounds over time — and it’s embedded in the retainer.

The retainer also provides predictable capacity. If you have a product launch in 6 weeks, a sale campaign to run, and an automation flow to build — all in the same month — the retainer covers all of it without renegotiating scope or waiting for a new proposal.

When a Retainer Makes Sense

Consistent sending cadence: If your brand benefits from 4–12+ campaigns per month (which most e-commerce brands do), a retainer is almost always more cost-effective than project pricing per campaign.

Active automation development: If you want flows built, tested, and continuously optimised — not just set up once and left — a retainer structure supports that ongoing work.

Peak season preparation: If you have Black Friday, Q4, EOFY, or Boxing Day campaigns that require multi-week strategy and execution, a retainer ensures the agency has dedicated capacity for those moments.

Scaling brand: If your revenue is growing and you want email to scale proportionally, a retainer gives you the ongoing strategic support to make that happen.

Post-$1M revenue: Once a brand is generating significant revenue through e-commerce, the case for a retainer is strong. A properly managed email programme at this stage should be contributing 25–40% of total revenue — which easily justifies a $1,000–$5,000+/month agency investment.

The Project Model: What It Is and How It Works

A project engagement is a scoped, fixed-price piece of work with a defined deliverable and end date. You pay for a specific output — an audit, a flow build, a new set of templates — rather than ongoing management.

Common Project Types and Pricing

Email audit (comprehensive written report)

US: $1,500–$4,000
UK: £1,200–£3,500
Australia: A$1,800–A$5,000
Canada: C$1,800–C$4,500

Full ESP setup (e.g. full Klaviyo onboarding)

US: $3,000–$8,000
UK: £2,500–£7,000
Australia: A$3,500–A$9,000
Canada: C$3,500–C$9,000

Single automation flow build (e.g. welcome series)

US: $800–$2,500
UK: £600–£2,000
Australia: A$900–A$2,800
Canada: C$900–C$2,500

ESP migration (e.g. Mailchimp to Klaviyo)

US: $2,000–$6,000
UK: £1,800–£5,000
Australia: A$2,500–A$7,000
Canada: C$2,500–C$7,000

Black Friday or peak season campaign execution (full strategy + sends)

US: $5,000–$15,000
UK: £4,000–£12,000
Australia: A$4,500–A$14,000
Canada: C$5,000–C$15,000

Email template design (set of 3–5 branded templates)

US: $1,500–$4,000
UK: £1,200–£3,500
Australia: A$1,500–A$4,500
Canada: C$1,500–C$4,000

When Project Pricing Makes Sense

Early-stage brands that aren’t ready for a retainer: If you’re generating under $250K/year in revenue and don’t yet have the list size or traffic to justify full ongoing management, a one-off Klaviyo setup or flow build gives you infrastructure without a monthly commitment.

Specific capability gaps: If your in-house team manages campaigns but you need someone to build your automation stack, a scoped flow-build project fills the gap without replacing your entire programme.

Audit-first approach: Some brands prefer to understand exactly where their programme stands before committing to a retainer. An audit project provides that clarity — and often identifies specific project work to follow.

Seasonal burst support: If you manage email in-house but want expert support specifically for Black Friday or another peak moment, a scoped seasonal project makes sense.

Post-migration infrastructure: If you’ve just migrated to a new ESP and need the account properly configured and flows built before you take over ongoing management, a setup project is the right entry point.

Retainer vs Project: Side-by-Side Comparison

Factor	Retainer	Project
Cost structure	Fixed monthly fee	Fixed per-project fee
Minimum commitment	Typically 3 months	One-time
Strategic continuity	High — agency learns your brand	Low — each project is standalone
Ongoing optimisation	Continuous	One-off
Capacity at peak moments	Guaranteed (within scope)	Requires new proposal
Accumulated account knowledge	Grows over time	Doesn’t carry forward
Predictability of cost	High	Variable (multiple projects)
Flexibility to pause	Lower	Higher
Best for	Brands sending consistently at volume	Brands with specific, defined needs

The Hybrid Approach: Project First, Retainer After

For many brands, the optimal path is a hybrid:

Start with a project — an audit and/or a full setup
Move to a retainer once the infrastructure is in place and you understand what ongoing management would look like

This approach gives you:

Infrastructure built correctly before committing to an ongoing relationship
A clear view of the agency’s work quality before signing a retainer
A properly configured programme from day one of the retainer, rather than spending the first month fixing setup issues

At Excelohunt, we frequently work with brands this way — an initial audit or setup project, followed by a retainer once both sides are confident in the fit.

The Real Cost Comparison: Annual Total

Let’s compare the annual cost of project vs. retainer for a mid-stage e-commerce brand sending 6 campaigns per month:

Project model (per-campaign pricing at $400–$600 per campaign):

6 campaigns/month × $500 average = $3,000/month
Annual campaign cost: $36,000
Plus: flow builds, templates, strategy (one-off) = ~$10,000
Annual total: ~$46,000

Retainer model (growth tier):

$4,000/month retainer (campaigns + flows + strategy + reporting)
Annual total: $48,000

The costs are comparable — but the retainer includes continuous strategic attention, flow optimisation, A/B testing, and accumulated account knowledge that per-project pricing doesn’t capture.

For many brands at this stage, the retainer delivers significantly more value at roughly the same cost.

Which Model Is Right for Your Brand?

Choose a retainer if:

You’re generating £300K/A$500K/C$500K/$500K+ in e-commerce revenue annually
You want to send email consistently (4+ campaigns per month)
You want your automation stack continuously optimised, not just built once
You have a seasonal business with peak moments that require expert execution
You want email to be a serious, strategic revenue channel — not just an occasional blast

Choose project pricing if:

You’re early stage and not yet ready for the volume commitment of a retainer
You have a specific, defined need — an audit, a setup, a flow build
You manage email in-house and need specialist support for a specific gap or moment
You want to test an agency’s work before committing to a retainer relationship

Consider a hybrid if:

You want to start with an audit or setup, then move to a retainer
You’re unsure of the scope you need and want to define it before committing monthly

How Excelohunt Prices Both Models

Retainers: Our retainers start from $1,000 USD/£800 GBP/A$1,400 AUD/C$1,350 CAD per month. We recommend a minimum 3-month engagement to give us time to build, test, and demonstrate performance. We don’t lock clients into annual contracts with no performance clauses.

Projects: We price all projects with a fixed, transparent quote before work begins. No hourly billing, no scope creep surprises. Common projects include audits, ESP setups, individual flow builds, and seasonal campaign execution.

We work across all major ESPs: Klaviyo, ActiveCampaign, HubSpot, Mailchimp, Omnisend, Brevo, and Dotdigital.

Start with a Free Audit

If you’re not sure which model makes sense for your brand, start with an audit. We’ll review your current email programme, identify what’s working and what’s missing, and give you an honest recommendation on whether a retainer, project, or hybrid approach is right for where you are.

Book your free audit at /free-audit

Transparent pricing. Both models available. No lock-in pressure.