A redesign loses search traffic when old pages disappear, change address or lose their content without Google being told where they went, and a short checklist prevents almost all of it.
The dip can arrive within weeks of launch, and by then the agency has moved on. Enquiries fall, the owner blames the new design and the real cause, a missing redirect map or a page that was quietly deleted, stays unnoticed.
This website redesign SEO checklist is in three stages: before you build, on launch day and in the three months after. It sits inside our wider guide to UK web design agencies, and you can hand it to whoever is building your site.
Why do redesigns lose traffic?
Redesigns lose traffic because search engines have to relearn your site, and anything that changed without a signpost looks like a page that vanished.
Google's own guidance on site moves says plainly that you may see ranking fluctuations while it recrawls and reindexes your site. It adds that it can take "a few weeks or more" for Google to gradually show the new URLs instead of the old ones.
So some dip is normal. What you control is how deep it goes and how long it lasts.
Most of the damage comes from five causes:
- URLs change and the old ones are not redirected to their matching new pages.
- Pages that ranked are merged, thinned out or deleted.
- Titles, headings and body text are rewritten without checking what the old page ranked for.
- Internal links break or point at the wrong place.
- A staging block, such as a "noindex" tag or a robots.txt rule left on the live site, tells Google to ignore the lot.
What should you do before the redesign?
Before design starts, record what you have: every URL, what each ranks for, which ones bring enquiries and which ones other sites link to.
Build the inventory
Export your list of URLs from your sitemap, your CMS, analytics and Search Console. Google's guidance suggests drawing on sitemaps, server logs, analytics and the CMS, and including images and other files. Then mark each URL as keep, merge, improve or remove.
Pull the last twelve months of data from Search Console, filtered to your top 50 pages by clicks. Note the queries behind them. Those are the pages the redesign must not harm.
Decide the new structure around the old rankings
Design the new page structure with the old results in view. Keep addresses the same wherever you can, because an address that does not change needs no redirect. Where you must change an address, record the old and new pair.
If the plan includes merging pages, check that the merged page contains the content that earned the old rankings. A slimmed-down page with the key paragraph deleted is the commonest self-inflicted wound.
Change one thing at a time
If you can, do not combine the redesign with a change of domain, platform and content strategy in one go. Google's site move guidance advises changing one thing at a time. A redesign on the same domain and with the same addresses carries far less risk than a new domain with new addresses and new copy.
What should you do on launch day?
On launch day, turn on the redirects, remove any block on indexing, check the canonicals and submit the new sitemap.
flowchart TD
A["Redesign ready on staging"] --> B["Map every old URL to its closest new URL"]
B --> C["Test redirects and canonicals on staging"]
C --> D["Go live and remove noindex and robots blocks"]
D --> E["Submit new sitemap in Search Console"]
E --> F["Crawl the live site for errors and redirect chains"]
F --> G["Monitor Search Console and analytics for 12 weeks"]
G --> H["Keep redirects in place for at least a year"]
The steps follow Google's published process for moving a site with URL changes. Four deserve a closer look.
Permanent redirects, one to one. Use server-side permanent redirects (301 or 308) from each old address to its matching new page, not to the homepage. Google says to avoid redirect chains and to send old URLs straight to their final destination.
No leftover blocks. Check the page source and robots.txt of the live site for noindex tags or disallow rules copied from staging. A noindex tag on launch day can wipe out a site's visibility within days.
Self-referencing canonicals. Each new page should declare itself as the canonical version, and internal links should point at the new addresses, not the old ones.
A fresh sitemap. Submit the sitemap of new URLs in Search Console. If the move is large, keep the old sitemap available for a short while so Google can find and process the redirects.
Test a sample of at least twenty old URLs by hand, covering your top pages, a few deep ones and some with query strings. A crawler can check the full list.
What should you check in the three months after launch?
Check Search Console weekly for crawl errors, coverage problems and drops on your top pages, and compare enquiry counts against the same weeks last year.
The first fortnight is for errors: pages returning 404, redirect loops, soft 404s and pages Google has been told to skip. Fix these quickly. Weeks three to six are for ranking movement. Expect some wobble, and worry only if your key pages fall and stay down.
Weeks seven to twelve are for recovery and improvement, such as updating titles that underperform or restoring content that was cut too hard.
Google advises keeping redirects in place for as long as possible, generally at least a year. Put the date in your diary, and do not let a later cleanup remove them early. When you plan the work, our piece on a realistic six-month SEO timeline sets expectations for how search results move after changes.
How to tell a normal dip from a real problem
A normal dip is small, spread evenly and recovering within a few weeks. A real problem is concentrated on specific pages or types of page, or keeps falling.
Compare impressions and clicks by page group: service pages against articles, for example. If one group falls sharply, look at that group's templates, redirects and canonicals. Check whether the pages are still indexed using the URL Inspection tool. If the number of indexed pages has dropped, look for a blocking tag.
What if you are already live and traffic has dropped?
Work backwards from the evidence. Open Search Console, look at which pages lost clicks, and compare them with your old URL list.
If pages are missing, restore them or redirect them properly. If the redirects are in place but go to the wrong pages, correct the mapping. If content was thinned, bring back what earned the ranking. Recovery after a fix usually takes weeks, since Google must crawl the pages again.
For a deeper diagnosis, our technical SEO on WordPress in one afternoon lists the checks that catch most platform issues, and the SEO agency pillar covers when to bring in specialist help.
What about the copy and the page elements?
Keep the words that earned the ranking, and change them only with a reason.
Titles and headings tell Google what a page is about. When a redesign rewrites them for style, a page that ranked for "emergency plumber Northampton" can become "Fast, friendly service" and lose its place.
Before launch, put the old and new titles, headings and opening paragraphs side by side for your top 20 pages. If the main phrase has disappeared, put it back.
Check the other elements that carry meaning: image file names and alt text, internal anchor text, structured data and the footer links that sat on every page. A redesign that drops structured data removes the markup that helped your results show reviews or opening hours. Compare what the old pages had with what the new ones have.
Speed counts too. A handsome new design that is slower on a phone can cost rankings and enquiries. Test the new templates against Google's targets before launch, as set out in page speed as a sales metric.
A checklist you can copy
Use this list as a sign-off sheet, and ask the agency to tick each line before launch.
- Inventory of every current URL, with traffic, ranking queries and inbound links.
- Decision on each URL: keep, merge, improve or remove.
- Redirect map from every old URL to its closest new page, with no redirects to the homepage.
- Redirects tested on staging, including query strings and trailing slashes.
- Titles, headings and opening text compared for the top 20 pages.
- Structured data and image alt text carried over.
- Staging noindex tags and robots.txt blocks removed on launch day.
- Self-referencing canonical tags on every new page.
- Internal links updated to the new addresses.
- New sitemap submitted in Search Console.
- Analytics and conversion tracking tested with a real enquiry.
- A weekly review in the diary for twelve weeks, with an owner named.
What should you ask your web agency?
Ask whether a redirect map is part of the quote, who creates it and who tests it.
Many web quotes cover design and build and leave search to the client. Ask for the redirect map as a named deliverable, with a launch-day test and a four-week check. Our guide on what your web agency should hand over puts it next to the other documents you should receive.
It matters most for sites that earn their work from search. A clinic or dental practice with strong local rankings, or a professional services firm with dozens of service pages, stands to lose real revenue from a careless launch.
Plan the launch before the design
If a redesign is on your list, plan the search side first. A page inventory and a redirect map take a few days and save months.
Our website design service treats the migration as part of the project, and you can contact us with your current site address for an honest view of the risk.
