SEO for Web Designers: What Every Site Needs to Rank

SEO for web designers is about making sure a website is built with search visibility in mind from the start. This means creating clear structures and templates that search engines and AI assistants can understand and rank. ProfileTree, a Belfast-based agency specialising in website development and SEO, discusses these requirements with clients during the initial briefing stage, helping avoid costly changes after launch.

Why SEO Has to Be Decided at the Design Stage

Most businesses commissioning a website assume the designer will look after SEO, and many designers assume the client has an SEO plan of their own. When both assumptions turn out to be wrong, the site launches looking good and then sits on page five of Google, where almost nobody sees it.

The cause is that search visibility depends on decisions made long before anyone writes a blog post. URL patterns, the way templates code their headings, the weight of each page and the depth of the navigation are all fixed during the build. A build that launches with weak foundations carries those problems into every page added later, and correcting them usually means reworking templates the client has already paid for.

This is why our WordPress web design projects treat search as a design constraint from the first wireframe. ProfileTree is a Belfast web design and digital marketing agency, founded in 2011 and based at the McSweeney Centre, and the briefs we write for new sites set out the technical SEO requirements next to the visual ones. The broader principles are explained in how SEO web design works; this article is the practical checklist for designers and for the business owners who brief them.

The Technical Foundations a Web Designer Controls

Technical SEO is the work that affects how search engines reach and index a site, where indexing means adding a page to Google’s database so that it can appear in results. Most of this work sits with the designer and developer, so it belongs in the build plan and not in an audit six months after launch.

Site Structure and URL Patterns

A logical structure helps visitors find what they need and tells search engines how pages relate to each other. The simplest version works best: broad service or topic categories at the top level, specific pages beneath them, and every important page reachable within three clicks of the homepage. Our guide to planning a website structure covers the options for larger sites with deeper catalogues.

URLs should mirror that hierarchy. A path such as /services/seo-northern-ireland/ tells a crawler (the software Google uses to discover pages) both the topic and the location, while /page?id=47&cat=3 tells it almost nothing. Once pages are indexed, their URLs should stay fixed, because the ranking value a page builds up over time is attached to its address.

Page Speed and Core Web Vitals

Core Web Vitals are the measurements Google uses to judge page experience. Largest Contentful Paint records how quickly the main content appears, Cumulative Layout Shift records how much the layout jumps while loading, and Interaction to Next Paint records how quickly the page responds when someone taps or clicks. Google confirmed that Interaction to Next Paint replaced First Input Delay as a Core Web Vital in March 2024, so older checklists that mention First Input Delay are out of date.

Page experience is one input among many, and a fast page will not outrank a more relevant one on speed alone. Slow pages do lose visitors before they have read a line, though, and for an SME competing in a local market that is an advantage handed to whoever loads first. We set out the fixes in order of effort in measuring and improving Core Web Vitals.

Most of the speed problems that begin in design are avoidable. The usual culprits are uncompressed hero images, fonts loaded from third-party servers that hold up rendering, heavy JavaScript frameworks where plain HTML and CSS would do, and video embeds that load in full before anyone presses play. Serving images as WebP or AVIF, deferring scripts the first screen does not need and setting a width and height on every image to stop layout shift are habits that improve all three measurements, and they are cheapest to apply while the templates are still being built. Run speed tests on the staging site before launch and again on the live site afterwards.

Mobile-First Layouts

Google indexes and ranks the mobile version of a page, so a page that looks excellent on a large monitor and awkward on a phone is judged on the phone. Google made mobile-first indexing the default for new websites from 1 July 2019 and has since moved the wider web over to it.

Designing mobile first means starting at the smallest screen and scaling up. Buttons and links need touch targets large enough for a thumb, and nothing important should depend on hover effects, which a touchscreen cannot trigger. Responsive layouts built with fluid grids and CSS media queries are the standard approach, while separate mobile subdomains such as m.example.com split signals between two versions of every page and are best avoided on a new build.

Crawlable Content, HTTPS, Sitemaps and robots.txt

Search engines index what they can fetch and render. Text drawn into images, menus that only exist once JavaScript has run, and content that waits on a script Googlebot may not execute promptly can all leave important material out of the index. Keep core content and navigation in the HTML itself, and treat pop-ups that cover the page on mobile as a cost to visitors as well as to rankings.

Every new site should launch on HTTPS, which Google has used as a lightweight ranking signal since 2014 and which browsers now expect by default. An HTTP site shows a security warning that puts people off contact forms at exactly the point they were about to enquire. An XML sitemap (a file listing the pages you want found) should be submitted in Google Search Console and Bing Webmaster Tools at launch, because Bing’s index is also used by AI assistants such as Microsoft Copilot. The robots.txt file tells crawlers which areas to skip, such as staging copies and admin screens, and it needs testing before every change, since one wrong line can block an entire site.

Template Decisions That Carry On-Page SEO

Page-level signals are the elements on each page that tell search engines what it is about. Some of them are filled in later by whoever writes the content, but the fields and markup that hold them are built into the theme, so a field missing at launch becomes a signal missing from every page.

Headings Coded for Meaning, Not Size

Search engines read heading tags (H1, H2 and H3) to understand the outline of a page. Each page needs one H1 that states its topic, H2 headings for the main sections and H3 headings inside them, with no level skipped.

This is a build decision more than a writing one. A heading styled to look large may be coded as a plain div (a generic HTML container) with a CSS class, and a div carries no structural meaning for a crawler. Templates should apply heading tags by their role in the page and leave the visual sizing to the stylesheet.

Title, Meta Description and Alt Text Fields

The title tag is the clickable headline in search results and the strongest on-page signal after the content itself. Google’s SEO Starter Guide advises titles that are unique to each page and describe it clearly. In practice, putting the main search term near the start and keeping the title under about 60 characters stops it from being cut off. Meta descriptions do not affect rankings directly, but a clear one of around 150 characters earns more clicks from the same position.

Every template, category and archive page included needs editable fields for both, which on WordPress usually means an SEO plugin such as Yoast or Rank Math configured properly at launch. The image library needs an alt text field as well, where alt text is the short description read aloud by screen readers and used by search engines to understand a picture. Good alt text describes the image plainly, for example, “designer reviewing a homepage wireframe on a laptop in a Belfast office”, and never strings keywords together.

Schema Built Into Each Template

Schema markup is structured data, usually written in a format called JSON-LD, that labels what a page contains in a way machines can read. A service business can carry Organisation or LocalBusiness schema with its name, address and phone number; guides can carry Article schema with the author and date, and question sections can carry FAQPage schema.

Schema does not lift rankings by itself, and special search listings are never guaranteed. Its value lies in clarity, because it confirms facts about the business and the page that crawlers would otherwise have to guess. Building it into templates means every new page inherits it, and the markup must always match what a visitor can see on the page.

Matching Each Template to Search Intent

Search intent is the reason behind a query. Someone typing “how does SEO work” wants an explanation, while someone typing “SEO agency Belfast” wants to compare providers, and the two need different kinds of pages. Agree on the page types before the templates are designed, since a guide needs room for long text and tables and a service page needs proof and a clear enquiry route near the top. A service template forced to carry a tutorial, or the reverse, makes it harder for the page to rank for either search.

Internal Linking Planned Before Launch

Internal links pass authority between your own pages and show search engines which of them matter most. A link placed inside the body copy of a related article carries more weight than the same link in a footer or sidebar, so the most commercially important pages should receive links from several relevant guides.

Descriptive anchor text, which is the clickable wording of a link, tells Google what the destination covers. A link reading “click here” says nothing, whereas a link reading “SEO services for Northern Ireland businesses” describes both the topic and the audience.

For a new site, the linking plan belongs in the content architecture before launch. A simple map showing which supporting pages point to which service pages, agreed with the content team at the start, saves months of retrofitting links into pages that are already live and already being crawled.

Local Signals for Northern Ireland and Irish Businesses

For a business selling to customers in a particular area, local results depend on more than the website. The map results shown for a search such as “web design Belfast” draw on the Google Business Profile, consistent name, address and phone details across directories, the searcher’s distance from the business and links from local sources. A well-built site without a claimed and maintained Business Profile will struggle to appear in that map at all.

Northern Ireland businesses also sell into two markets with different currencies, rules and vocabulary, so the site has to decide which customer each page is for. Separate location pages and prices shown in both sterling and euro are design decisions as much as content ones, and they are far easier to plan into the templates than to bolt on later. For companies targeting the region, our SEO Northern Ireland team works through these choices with the web design team at the start of a project.

The Design and SEO Brief to Agree Before the Build

Most SEO problems on new websites surface around three months after launch, when the owner asks why enquiries have not arrived, and someone finally runs a technical audit. Agreeing the requirements in writing before work starts removes most of them, and it gives everyone involved the same checklist to sign off against.

What the Brief Covers

At ProfileTree, the brief is agreed before design starts, and the speed and template checks are run on the staging site, so issues are fixed during the build instead of after launch.

Protecting Rankings During a Redesign

A redesign of a site that already ranks carries more risk than a new build, because the pages Google rewards today can lose their positions within weeks. Keep every URL that earns traffic, or redirect it one-to-one to its new equivalent, and carry over the titles and content that perform. Benchmark rankings and enquiries before the switch so that the effect can be measured afterwards, and the full process is set out in protecting rankings in a redesign.

Ciaran Connolly, founder of ProfileTree, puts it this way: “Redesigning a site that already ranks needs the care of an operation. Keep the URLs and what Google already rewards, and change only what is holding the site back. Most of the damage I have seen done to business websites in Belfast happened during a rebuild that nobody measured, which is why every WordPress web design project at ProfileTree is measured before and after launch.”

Getting a Website Built with SEO from the First Wireframe

If you are planning a new site or a redesign, start with the brief above and agree it with whoever is building the site before any design work begins. A new WordPress website from ProfileTree starts at £4,000 plus VAT and follows the technical SEO checklist in this article, and our work is backed by more than 500 Google reviews with a 5.0 rating. Where you want rankings work to continue after launch, our SEO services across the UK and Ireland carry on from the same brief, so get in touch with the team to talk through your project.

Questions About SEO for Web Designers