When you work in digital marketing, website redesign is inevitable: Every few years, you have to roll up your sleeves and get it done. It’s always an all-hands-on-deck proposition, and website redesign and SEO planning should bring brand, web design, content, and dev teams together from the start; for teams that need a lighter process, Siteimprove’s simpler site redesign guide can help.
But you know who is often left out of the planning? Your friendly neighborhood SEO expert.
I’ve seen it happen too often: SEO is treated as an afterthought, the site is redesigned and launched, and oops, your rankings tank. Years of SEO value, including authority, backlinks, indexed pages, and content performance, up in smoke.
Slow down before the build starts. Put SEO into the redesign plan early, and you’ll keep the value you’ve earned instead of trying to win it back after launch. Name an SEO owner, map content and redirects early, QA staging across key devices, validate analytics, and monitor performance after launch; an enterprise website redesign readiness assessment can help teams spot SEO, accessibility, content, and performance risks before they become launch blockers.
Business objectives that affect SEO
Maybe your aim is to show off a new brand, capture the business value of website redesign, and update the website design to get an edge over your competitors. Or maybe the site’s just too slow, too hard to navigate, or too cluttered for people to find what they came for. Or you’re laser-focused on doing everything possible, like adjusting the navigation and content paths, to better convert visitors.
To accomplish these goals with a redesign or new website, core features often need to change. Before approving changes to CTAs, content organization, page layouts, URL structure, or your CMS, weigh the upside against the SEO impact: crawlable navigation, internal link equity, page speed, mobile visibility, backlinks, and baseline rankings can all shift. Those ripple effects can torpedo organic search, the ultimate face plant when you work in digital marketing, especially when website redesign governance gaps leave SEO, accessibility, content, and performance owners unclear.
Mistakes to avoid
While lots of little things can go wrong that you can fix quickly and easily, think of these major-league missteps as a website redesign SEO checklist that I’ve seen marketing teams live to regret ignoring.
Mistake #1: Not establishing benchmarks for SEO performance before your redesign
Rankings, traffic, and conversions can all be affected by a redesign, often for the better, but you can’t quantify those changes if you don’t have a baseline in tools like Google Analytics and Google Search Console. A comprehensive content and SEO audit before launch, ideally as part of a pre-redesign audit framework, will help you spot fluctuations in rankings and traffic that fall outside the norm after launch.
An SEO audit tool such as Siteimprove Search can evaluate your SEO performance across key indicators, while Google’s SEO effort guidance can help the team confirm foundational crawl, content, and linking best practices before launch.
Areas that are especially important to measure include:
- Keyword rankings
- Click-through rates
- Conversion rates
- Page speed
- Top landing pages
- Pages that get the most traffic
- Pages converting the best
There could be many more things you want to monitor depending on your site and your business goals; the important thing is to build an SEO checklist, identify everything that matters, and establish what your baseline is before you launch your redesign.
Mistake #2: Ditching high-performing content willy-nilly
Don’t delete a page just because it looks dated. If it brings in qualified traffic, backlinks, or rankings, it has a job to do. If you’ve got existing content that’s performing well, keep it. Otherwise, you risk losing hard-earned traffic, inbound links, featured snippets, and the keyword coverage those pages already support.
Search engines prioritize user experience by aligning content and search intent with SERP results. If you remove or heavily change high-performing content, you could hurt your site ranking by weakening relevance, internal links, backlinks, or search intent alignment. This is especially important for content-critical and competitive industry keywords.
Continually reviewing and updating your content should be routine even when you’re not doing a redesign, it’s a fundamental best practice regardless, but if you do need to tinker with it, be sure to retain important pieces, like the page title, H1 and H2 tags, and keywords, to ensure continuity and SEO integrity.
Updating high-performing content is always a balancing act: You want to make it the very best it can be in terms of research and the quality of writing, but you also don’t want to revise it so much that you lose traction with SERP. If, for example, you lose important keywords, topical coverage, or intent signals during the editing process, you might see a decrease in ranking of that piece.
Mistake #3: Letting unoptimized code, uncompressed images, or incorrect JavaScript slow down your site
Slow pages bleed visitors. They also make every other part of the redesign work harder, from Core Web Vitals to conversions. Also, with Google’s Core Web Vitals and page experience officially factoring into rankings, fast, stable, easy-to-use pages can also help you compete in difficult SERPs.
There are typically two culprits behind a slow site: unnecessary, unoptimized code and large, uncompressed images. Both bad code and bulky images can be introduced at any point during a redesign.
When building a site, there are lots of features that you can add that might come with code that you will never use and will slow your site down. I recommend using a tool like Siteimprove Performance on your staging site to check how fast your revamped site loads and see just what’s bogging down your pages. Fixing these speed issues is vital to a successful redesign launch.
But there’s a third possible culprit when you’re dealing with slow page loads: JavaScript. Some JavaScript implementations can make crawling and rendering harder for search engines, especially if important content takes longer to render or renders incorrectly.
If you’re curious to learn more about this, Google has a great resource on how to fix JavaScript-related issues. The most important thing is to not try to fix JavaScript-related issues with cloaking, deliberately showing different content to users vs. search engines, a black hat tactic that violates Google Search Essentials and can lead to penalization in search engine results.
Mistake #4: Not embracing the opportunity to adjust what’s above the fold
When you’re making web design decisions for web pages, obviously you take what’s above the fold, the top portion visible without scrolling, into consideration. But the same consideration applies to the content. In website design, a big hero image can be eye catching, but valuable content that users don’t have to scroll to find is often more useful from an SEO standpoint.
Make sure you have unique content above the fold to support visibility and search rankings. While it may be tempting to replicate messaging across all pages, that’s a lazy move that will hurt you in the long run. Prioritizing unique and engaging content can improve user experience and search engine performance.
Also: Don’t forget to include a CTA above the fold on conversion-focused pages. If you want people to scroll to a specific point on the page, click a link, or watch a video, put that action near the top of the page so higher-intent visitors have an immediate next step.
Remember to cater to mobile users as well, since unique above-fold content holds even greater significance on smaller screens. On mobile especially, don’t bury the useful stuff. Put a distinct answer, proof point, or next step high enough that people see it before they start hunting.
Mistake #5: Missing out on mobile optimization
Never forget that mobile devices account for a huge share of internet traffic, so making sure your site is fully optimized for mobile users is absolutely essential. While mobile-friendliness doesn’t figure into search algorithms quite the way it used to, you still have to prioritize it.
Because click through rates are lower on mobile, clicks are harder to come by. That means that getting to the top of the SERP is vital to capture any conversions from mobile. Users are less likely to click on any links on mobile at all, so everyone is fighting for a smaller piece of the pie.
Your mobile version also needs to be fast: Just like with desktop, slow pages can lead visitors to leave before they take action. Use Page Performance to check the speed of your mobile site, but also use a tool like SEO Advanced to make sure your mobile visitors can pinch and zoom on content to be able to read it.
Mistake #6: Not fixing broken links before launch
If you push a revamped site live with hundreds of broken links, your rankings can suffer as search engines and users run into dead ends, especially if those links involve pages with traffic, backlinks, or conversions. By the time you’ve identified the problem and fixed the links, you may also have spent a lot of time, and therefore money, getting everything straightened out.
Backlinks are important signals to search engines that your site is a credible, trustworthy source of information. Maintaining those backlinks through your redesign is vital for making a smooth transition from your old site to your new website.
Not only will you need to set up redirects for your page (see Mistake #7), but you also may want to reach out to websites that link to your site and ask them to update their link from the old URL to the new URL. This will avoid redirecting users and will make a better experience for search engines and users.
Mistake #7: Forgetting to set up redirects
404 errors spell more than just inconvenience for users: Every broken link can damage trust because it sours the user, and if the page has a CTA, then you’re possibly losing a conversion, too.
But 404s affect SEO, too, because pages that receive meaningful backlinks have added SEO value. From an SEO standpoint, it's crucial that pages receiving backlinks, especially high-value backlinks from other sites with a high SEO trust score, aren’t dead ends.
This is where proper, permanent 301 redirects and a clear URL structure with new or modified URLs are critical: The redirects inform search engines of the page's permanent move, its new location, and how to access it. When implemented correctly, 301 redirects can help consolidate signals from the former page to the new location, saving you from starting over wherever possible.
Before launch, preserve high-performing URLs when you can, avoid changing slugs just for cosmetic reasons, and keep folder structures logical. Build a one-to-one URL mapping spreadsheet that pairs every old URL with its new destination, prioritized by traffic and backlinks, so your dev team has a single source of truth and can test for redirect chains, loops, orphaned pages, and irrelevant destinations.
Now, it can be tempting to redirect all lost pages to the home page so you don’t have any 404 errors. That shortcut usually creates a worse experience. Send people to the closest relevant page, not to a homepage that makes them start over.
If you have a large website and are facing a seemingly endless list of redirects, you can use a crawler to identify URLs and backlinks so you can focus only on the most important redirects.
As soon as your new site goes live, scan it for broken links immediately, validate structured data on priority templates, and confirm that robots.txt, canonicals, and indexation signals are not blocking important pages. That way, you can quickly fix any issues that might have gone astray or that are subject to crawl errors that prevent your pages from surfacing in the SERPs.
Time is of the essence with redirects, because unresolved broken links and crawl errors can make it harder for search engines to understand and rank your redesigned site.
Mistake #8: Forgetting to update XML sitemaps
XML sitemaps are special files that list the most important pages of your website to make it easier for search engines to crawl and index it. After a website redesign, it's important to update your XML sitemap so search engines can quickly check out and index the fresh changes. If you skip this step, discovery and indexing can take longer, and some pages could be missed.
As soon as you’ve completed and launched the redesign, make sure your sitemap is updated as well. Many CMSs will automatically update your sitemap, but if yours doesn’t, you’ll need to get an updated version. Once you have the updated sitemap, you’ll need to submit it in Google Search Console and send it to other search engines.
Crawl frequency varies by site, and there is no way to force a search engine to crawl your site immediately. Still, resubmitting your sitemap alerts search engines that something has changed and can help them discover your redesigned pages sooner.
Quick website redesign SEO checklist
- Before the redesign: Audit top-performing pages, benchmark rankings, traffic, conversions, CTR, and page speed in analytics and Google Search Console, review current search guidance and Core Web Vitals, inventory content, and map priority keywords to search intent.
- During the build: Preserve valuable content and URLs where possible, create one-to-one redirect rules, QA meta tags, canonicals, robots.txt, noindex directives, structured data, internal links, mobile usability, page speed, and staging-site crawlability.
- Launch day: Validate analytics and tracking, publish and submit the updated XML sitemap, crawl the new site for broken links, blocked pages, redirect chains, and crawl errors, and spot-check high-value landing pages.
- After launch: Monitor rankings and traffic weekly for the first 30 days, compare performance against pre-redesign benchmarks, review index coverage and crawl errors, and keep 30-, 60-, and 90-day reporting in place.
Slight dips in traffic are normal after a redesign
So, if you avoid each one of these mistakes, that means your metrics won’t drop when you launch your redesigned site, right?
Nope. Even with careful planning, you may still see some loss in traffic and keyword rankings after a redesign, but it should be easier to limit if you’ve been on the ball. There’s no need to panic when your migration basics are solid, because many dips are temporary. Search engines need time to crawl your redesigned site and process its structure and content changes, which can cause short-term fluctuations.
Once that happens, performance is more likely to stabilize, though recovery depends on redirects, crawlability, content changes, and technical setup. Bringing your SEO team to the table early and folding SEO migration planning into your enterprise website redesign strategy helps reduce major, immediate dips. They can prepare pre-launch checks, then monitor rankings, traffic, and issues in Google Search Console while developers quickly test redirect, mobile, performance, and cross-device fixes.