SEO-Friendly Website Design: The Technical Foundations Checklist

An SEO-friendly website is one built so that search engines can crawl, understand and index your pages without problems. Most of that is decided by choices made during design and development: page structure, addresses, how links are coded, the mobile version, speed and how content is delivered from the server. A plugin installed after launch does not replace these decisions.

The sections below walk you, in order, through the technical foundations to discuss with your team when you commission a new site or rebuild your current one.

What does an SEO-friendly website mean, and what does it not mean?

An SEO-friendly site is not a site that guarantees rankings. Google states plainly in its SEO starter guide that there is no secret that will automatically put your site in first place. A sound foundation removes the obstacles so that your content and authority can pay off. Content quality, fit with search intent and references from other sites, which determine rankings, are separate pieces of work.

In practice, a few questions tell you whether a site is SEO-friendly. Can Google reach every important page through a link? Does the page's main content also exist in the mobile version? Does every page have its own meaningful address and title? Can the text and links be read without JavaScript running? The answers to these questions are largely set at the design stage.

How should you plan an SEO-friendly website structure and menu?

The first decision is the page hierarchy. A structure that goes from the home page down to service or category pages, and from there to individual pages, shortens the path for both visitors and search engine crawlers. An important page should be reachable from the home page in a few clicks, and no page should be left orphaned, meaning without a link from any menu or page.

A mistake we see often is splitting one topic across several very similar pages. For example, opening two separate but nearly identical pages for "corporate web design" and "corporate website development" makes those pages compete with each other for the same search. Give each search intent one strong page, and draw up your sitemap according to this rule before design starts.

What should your URL structure look like?

Google recommends keeping addresses as simple as possible and separating words with hyphens. A readable address such as /services/corporate-web-design is clearer for both users and search engines than a parameter address such as ?id=482&cat=7.

Google's URL documentation also highlights a specific risk: complex addresses with multiple parameters can generate a large number of URLs that lead to the same or similar content. In that case Googlebot can spend more resources than necessary, and not all of the site's content may get indexed. Filter and sort options on e-commerce sites are the most common source of this problem; decide at the design stage which filter combinations will become separate pages.

Set a rule for accented or non-English letters too, and stay consistent. Most sites write them in plain Latin letters in the URL, which stops shared links from turning into unreadable encoded characters. What matters most is to set the addresses once and not change them often.

How should links be coded?

A detail that designers can overlook but that directly affects SEO is the code behind links in menus, buttons and cards. According to Google's link documentation, Google can generally crawl a link only when it is coded as a standard anchor tag with an href attribute. A box or button that changes the page with JavaScript when clicked may look like a link to the user, but it is not a link to the crawler, and the page behind it may not be discovered.

Link text matters as well. Instead of "click here" or "read more", text that describes the destination, such as "our corporate identity work", tells both users and Google what they will find on that page.

Should the mobile version carry the same content as desktop?

Yes. For indexing and ranking, Google uses the mobile version of your site, crawled with its smartphone crawler; this is called mobile-first indexing. Google's documentation states clearly that only the content shown on the mobile site is used for indexing.

So removing text, a table or an FAQ section on mobile to save space can mean that content does not exist for Google either. You can move content into accordions or tabs on mobile; Google accepts this as a different design for the sake of user experience. Headings, image alt text and structured data should also be the same in both versions. For mobile design principles, see our article on responsive, mobile-first web design.

What should you watch for on sites built with JavaScript?

On sites built with libraries such as React or Vue, content is often created in the browser after JavaScript runs. According to Google's JavaScript documentation, Googlebot queues pages for both crawling and rendering, and it is not immediately obvious from outside which stage a page is waiting for. Google states that server-side rendering or pre-rendering is still a good idea, because it makes the site faster and not all bots can run JavaScript.

The same documentation points to another trap: JavaScript in files and pages blocked by robots.txt is not rendered by Google Search. In other words, blocking JavaScript or CSS files the site needs to work can lead Google to see the page incomplete.

The question to ask when you get a quote is simple: are the page title, text and links ready in the HTML that comes from the server? If the answer is yes, this risk largely disappears. This choice is easy to make at the start of a project; changing it later on a live site often requires serious development work.

How do you account for speed and Core Web Vitals in the design?

Speed is one of the hardest things to fix afterwards, because most problems come from design decisions: a heavy video filling the first screen, a banner that shifts position as it loads, or late-loading fonts that make the page jump. According to the Core Web Vitals definitions on web.dev, a good experience means LCP happens within 2.5 seconds, INP is 200 milliseconds or less, and CLS is 0.1 or less.

At the design stage, fixing the dimensions of image areas, keeping the main image on the first screen light and limiting the number of fonts make these targets easier to reach. We explain the measurement and improvement steps in detail in our article on Core Web Vitals.

How do you protect your rankings when you rebuild the site?

From an SEO point of view, the riskiest moment is moving an existing site to a new design. If addresses change, Google recommends preparing a list that maps old URLs to new ones and setting up permanent server-side redirects such as 301. Old addresses that are not redirected return errors, and the rankings and external link value those pages earned are lost.

Before the move, list all addresses on the current site and the pages that receive traffic in Search Console, and decide the equivalent of each one in the new structure. Google also notes that after a move it crawls the new site more heavily than usual for a while, so your server needs to be able to handle the extra load.

In short: an SEO-friendly website checklist

• One page per search intent; important pages reachable in a few clicks from the home page
• Short, readable, hyphen-separated URLs that will not change often
• A decision made up front so filters and parameters do not generate endless addresses
• Menu and content links coded as standard anchor tags with href
• The same content, headings and structured data on mobile and desktop
• Text and links ready in the HTML from the server; required JavaScript and CSS files not blocked
• A unique title and meta description on every page
• Core Web Vitals targets set at the design stage
• An old-to-new URL map and permanent redirects when you rebuild

If you want to build your new site on these rules from the start, take a look at our web design service or contact us to talk about the state of your current site.