How to Create a Custom Mailchimp Template for Your Business

Creating a custom Mailchimp template is one of the most practical steps a small or medium-sized business can take to make its email marketing look professional and perform consistently. Rather than starting from scratch every time you send a campaign, a well-built template locks in your branding, speeds up your workflow, and ensures every email you send meets the same standard.

For businesses in the UK and Ireland, there’s an extra layer to get right: your email footer must comply with legal requirements that most generic guides ignore entirely. This walkthrough covers both the practical build process and what your template needs to include to keep your campaigns legally compliant.

Which Mailchimp Builder Should You Use?

Before you open Mailchimp and click “Create Template,” it’s worth choosing the right starting point. Mailchimp currently offers three ways to build:

The New Drag-and-Drop Builder is Mailchimp’s default for new accounts. It’s visual, fast, and requires no coding knowledge. You can set brand colours, upload your logo, and arrange content blocks without touching a line of HTML. This is the right choice for most marketing managers and business owners who need a professional result without technical overhead.

The Classic Builder is the older interface, still accessible for legacy accounts. It has slightly more control over layout but lacks some of the AI-assisted features in the newer version. If you have existing templates built in the Classic Builder and they’re working well, there’s no urgent reason to migrate them.

Custom HTML Import gives developers full control over markup and styling. You write or commission the code, export it as a ZIP file or paste it directly, and Mailchimp renders it as a template. This route is best when brand consistency demands pixel-precise control, or when you’re working from a design file that a standard builder can’t replicate accurately.

For the purposes of this guide, we’ll walk through the New Builder, since it covers the practical needs of the majority of UK and Irish SMEs.

Setting Up Your Template in the New Builder

Log in to your Mailchimp account and navigate to Campaigns > Email Templates > Create Template. You’ll see layout options; choose “Start from Scratch” rather than a pre-built theme if you want full control over the structure from the beginning.

The builder opens with a single-column layout. From here, the most efficient approach is to build your template in three layers: global brand settings first, then layout structure, then content blocks.

Configuring Global Brand Settings

Before you place a single content block, set your brand defaults. In the left-hand panel, look for the Brand Kit or Design settings (the exact label varies by account tier). Here you can define:

• Primary font and fallback font. Mailchimp supports a limited set of Google Fonts; always set a web-safe fallback (Arial, Georgia, or Verdana) for email clients that block external fonts. Outlook, which many UK business contacts still use, will render your fallback rather than your chosen font.
• Brand colours. Enter your hex codes directly. Set both a primary and a secondary colour so your buttons and headings stay consistent.
• Logo. Upload your logo file at a minimum of 300px wide. Mailchimp will scale it, but starting with a higher-resolution file prevents blurring on retina screens.

Getting these defaults set at the template level means you won’t need to reapply them to every campaign you build from the template later.

Building the Layout Structure

With brand settings in place, drag in the content blocks you’ll use in every campaign. A standard business email template typically needs:

Header block: Logo centred or left-aligned, with your brand’s primary background colour. Keep the header height under 150px; taller headers push your main message below the fold on mobile.

Body blocks: One or two columns, depending on your content type. Single-column layouts perform more reliably across email clients and are easier to read on mobile. If you regularly send newsletters with multiple story items, a two-column grid in the middle section works well, provided you test it on mobile before saving.

Call-to-action button: Place this above the fold in the template so it appears in the visible area without scrolling. Mailchimp’s button block lets you set a default URL placeholder, which you’ll update for each campaign.

Footer block: This is the most important block to get right, and we cover it separately below.

As Ciaran Connolly, founder of ProfileTree, notes: “Most small businesses treat their email footer as an afterthought, but it’s the one part of the template that has legal implications. Getting it wrong isn’t just a formatting issue.”

UK and Ireland Legal Requirements for Email Footers

This is the section most Mailchimp guides skip, and it’s the one UK and Irish business owners most often get wrong.

Under the UK Companies Act 2006 and equivalent Irish legislation, all business emails must include specific company information in the footer. The requirements apply to emails sent as part of business communications, which include marketing campaigns.

For UK limited companies, the footer must include:

• The company’s registered name (exactly as it appears at Companies House)
• The registered office address
• The company registration number
• The place of registration (England and Wales, Scotland, or Northern Ireland)

For sole traders and partnerships, you must include your name and business address.

For all UK and Irish businesses, the Mailchimp unsubscribe link alone does not satisfy your legal obligations. You need a physical address in the footer regardless of whether you’ve enabled Mailchimp’s auto-footer.

Mailchimp’s built-in compliance footer includes a physical address and unsubscribe link, but it pulls from whatever address you entered in your account settings. Log in to Account > Settings > Contact Information and verify that the address shown is your registered office, not a personal address or a PO box.

Build a static footer block in your template that contains this legal text in a small but legible font size (11pt minimum). Set it in a neutral colour against a contrasting background so it’s clearly readable.

Technical Specifications for UK Business Emails

A few numbers worth knowing before you save your template:

Email width: Set your template width to 600px. This is the industry standard and renders correctly in Outlook, Gmail, and Apple Mail without horizontal scrolling.

Header image dimensions: 600px wide by 100–200px tall. Anything taller will be cropped or scaled awkwardly on mobile.

Body text: Minimum 14px for body copy, 18–22px for headings. Smaller text becomes unreadable on mobile without pinching.

Button sizing: Minimum 44px tall for touch targets on mobile. Mailchimp’s default button padding usually meets this, but check it in the mobile preview.

Images: Always add alt text to every image in your template. Beyond accessibility, many business email clients block images by default. If your header image has no alt text, recipients see a blank box with no context.

Optimising for Dark Mode

A growing proportion of email opens happens in dark mode, particularly on iOS and Android devices. Mailchimp’s New Builder handles basic dark mode conversion automatically, but it can invert light backgrounds to dark in ways that make light-coloured text disappear.

To prevent this, avoid using white text on a white background (common in some template designs where the text is meant to sit on a coloured block). Always test your template in dark mode before finalising it.

In the New Builder, you can preview dark mode rendering by toggling the preview options in the top right of the builder. If your logo has a transparent background and uses dark colours, it may become invisible in dark mode. Export a version of your logo with a white or brand-coloured background for use in email templates specifically.

Testing Your Template Before It Goes Live

Save a draft of your template, then send a test email to at least three different email addresses: one Gmail account, one Outlook account, and one mobile device. These three cover the majority of your recipients’ environments.

Check each test for:

• Does the header image load? Is it the right size?
• Does the font render correctly, or has it fallen back to the default?
• Is the layout single-column on mobile, or is text being cut off?
• Does the unsubscribe link work?
• Is the legal footer visible and accurate?
• Do all buttons link to the correct placeholder URL?

Fix any issues in the builder before saving the template as your standard. A template with broken formatting will compound the problem at scale: every campaign you send from it will carry the same fault.

Saving and Managing Your Templates

Once your template is tested and approved internally, save it with a clear naming convention. Mailchimp lists your saved templates in the Email Templates section of Campaigns. Use names like “Newsletter – Standard 2025” or “Promotional – Single Column” rather than “Template 1” or “New Template.” This matters more as your account grows and multiple team members are sending campaigns.

If you have different template variants for newsletters, promotional campaigns, and transactional updates, create a separate saved template for each. Trying to adapt one template to cover all three uses creates friction and increases the chance of errors in the editing process.

When to Bring in Professional Help

Building a drag-and-drop template in Mailchimp is well within reach for most marketing managers. The point at which professional support becomes worthwhile is when you need something the builder can’t deliver: advanced conditional content that shows different sections to different audience segments, deep integration with a CRM or e-commerce platform, or a completely custom HTML design that matches a brand identity system precisely.

ProfileTree’s digital marketing team works with SMEs across Northern Ireland, Ireland, and the UK on email marketing setup, template design, and campaign strategy. If your current email output isn’t converting or doesn’t reflect your brand accurately, a template audit is often the fastest way to identify what’s pulling results down.

Frequently Asked Questions

These are the questions we hear most often from business owners setting up Mailchimp for the first time. If yours isn’t here, the answers above cover the full build process in detail.