The new site went live on a Tuesday. It looked great. The agency sent a handover document and closed the project.
By Friday, the client had noticed enquiry form submissions were down. By the following week, Google Search Console was showing a sharp drop in impressions across three of their most important service pages. The URLs had changed during the build, nobody had set up 301 redirects, and the pages that had ranked for their core terms were effectively gone. The new URLs were starting from zero.
This is not an unusual story.
You probably already know your site needs work. It looks dated, the mobile version frustrates people, and there is a nagging sense it is not doing the commercial job it should. What you are less sure about is how to do this without spending a significant amount and ending up with something that looks better but works worse. That is the right thing to worry about.
A website redesign in 2026 is three things happening simultaneously: a search event, an AI visibility event, and a conversion rate event. Most agencies manage one of these well. Getting all three right requires a different kind of brief, and a different set of questions before you sign anything.
What has changed since the last time you did this
If your current site was built more than three or four years ago, a number of the rules have changed in ways that are not visible from the outside.
Core Web Vitals. In 2021, Google made page performance a confirmed ranking factor. Core Web Vitals became a confirmed ranking signal covering three specific things: how quickly the page loads its main content, how stable the layout is while it loads, and how fast it responds to user input. A site that fails these scores is penalised in rankings, not just in user experience. A new site that looks beautiful but relies on a heavy page builder, unoptimised images, or a stack of third-party scripts can actually perform worse on these measures than the old site it replaced.
Mobile-first indexing. Google now crawls and ranks your site based on its mobile version. Not as a secondary consideration. The primary one. A site that is technically "responsive" but cramped, slow, or difficult to navigate on a phone is being evaluated on exactly that version first.
AI Overviews. For many informational searches, an AI-generated summary now appears at the top of the results page, consuming clicks that previously went to the organic listings below it. A redesign is the best moment to build AI-readiness into the new site. Retrofitting it after launch is a considerably harder job.
E-E-A-T. Google's quality evaluators now look explicitly for Experience, Expertise, Authoritativeness, and Trust signals. For a business website, that means named people with real credentials, a properly built About page, and trust signals that match what the visitor needs to see at each stage of their journey through the site.
The three-year redesign cycle is too mechanical. Performance-triggered redesign is more reliable: when Core Web Vitals scores fall, when conversion rate drops without a clear other cause, when the business has changed enough that the site no longer reflects what you actually do, or when the site consistently fails to appear in AI-generated answers for your core queries.
The SEO risk most agencies will not warn you about
This is the most important section. If you have had a redesign go wrong before, this is almost certainly where it went wrong.
Google knows your site as a collection of specific URLs. When a URL that has been ranking for years changes, Google treats the new URL as an entirely new page with no history. All the links pointing to the old URL, all the authority signals that have accumulated over time, do not automatically transfer. A page at the top of page one for a valuable term starts again from scratch.
Sound familiar?
The most common failures in a redesign. URLs change without 301 redirects being set up. Metadata, meaning the page titles and descriptions that were earning clicks in search results, gets rewritten from scratch based on what looks good rather than what was performing. The internal linking structure, which tells Google which pages matter most and carries authority around the site, gets rebuilt with no reference to what existed before.
Redirects are necessary but they are not a complete solution. A redirect tells Google the page has moved. It does not immediately restore the ranking. There is always a crawl delay and a reprocessing period. A well-handled launch will usually show a temporary dip in the first two to four weeks as Google works through the new site. If that dip has not recovered by week six or seven, something was missed.
Good practice looks like this: before any development begins, the existing URL structure is audited. Every page earning meaningful traffic or inbound links gets mapped to its new equivalent. Every old URL that changes gets a 301 redirect to its destination. Existing page titles and meta descriptions are preserved as a starting point and changed only where there is a clear, research-backed reason to improve them.
For more on getting your website structure right before and during a rebuild, that post covers the underlying principles in detail.
Working with a specialist SEO agency from the brief stage, not the launch stage, is the difference between a redesign that builds on your existing search equity and one that burns it. Calling in SEO thinking at the end as a final sign-off check is usually too late to change anything that matters.
What a redesign means for your AI search visibility
AI search is not a future concern. ChatGPT, Google AI Overviews, Perplexity, and similar tools are already answering questions your prospects are typing right now. When they do, they draw on specific signals to decide which sources to quote. A site built without those signals starts at a disadvantage, and so does every new enquiry it fails to generate.
When a business owner asks an AI tool "what should I look for when briefing a web agency" or "how long does a website redesign take", the AI assembles its answer from sources that are structured, specific, and clearly connected to a real business or expert. Generic pages with no authorship, no structured data, and no clear trust signals tend not to make the cut.
Industry data suggests content with accurate, comprehensive schema markup is significantly more likely to appear in AI-generated answers than equivalent content without it. A redesign is the easiest moment to get this right, because you are starting fresh rather than retrofitting into an existing site built without it in mind.
Three specific things to implement during any rebuild. JSON-LD structured data on every relevant page: Organisation schema on the homepage, Service schema on each service page, FAQPage schema on any page answering common questions, LocalBusiness schema where you serve a specific geography. A genuine About page with named individuals, credentials, and real trust signals. And an llms.txt file, an emerging convention that tells AI crawlers what your site contains and what you would like them to do with it.
This is why thinking about AI search visibility at the brief stage matters. Competitors who have already implemented structured data have a head start that is hard to close after launch. The rebuild is the moment to get level, or ahead.
For more on how AI-driven traffic behaves once it arrives, the CT post on why AI traffic converts at 5x the rate explains why this channel is worth competing for.
The conversion rate question your redesign brief should answer
Most redesign briefs describe how the new site should look. Very few describe what it should do. Those are different questions, and the answer to the second one is what determines whether the investment pays back.
Before you approach any agency, the most important question you can answer is: what does this site need to achieve in measurable terms? How many enquiries per month? From which service pages? If you cannot answer this before the brief, the agency will default to making something that looks good, because that is all you asked for.
The question to put to every agency you speak to: "What conversion rate is your portfolio achieving for sites similar to mine, and how are you measuring it?" If the answer is framed entirely in terms of design quality and user experience rather than leads generated or enquiry rate, that tells you something about their priorities.
Conversion-focused web design is not about tricks or clever button colours. It is about clarity. One clear proposition per page. One clear next step. No navigation dead ends. A three-second delay in page load time consistently loses a significant proportion of visitors before the page has even finished rendering, across both e-commerce and service businesses. The conversion rate of the new site depends partly on the design and partly on the technical performance that underpins it.
Post-launch, conversion rate is only measurable if the tracking was set up correctly before launch. GA4 conversion events, heatmaps, and session recordings are not add-ons to configure later. They need to be in the build specification from the start. The data from the first 90 days is how you understand what the new site is doing, where it is losing people, and what to fix next. Without it, you are guessing.
How to brief a website redesign in 2026
Before you approach any agency, have three things ready. First: a clear picture of your current analytics. Which pages are driving traffic? Which ones are generating enquiries? What is your current conversion rate? If you do not know these numbers now, you cannot judge whether the new site is an improvement. Second: a list of what the current site is failing to do commercially, not aesthetically. "The services page gets 200 visitors a month and generates two enquiries" is useful. "It looks dated" is not. Third: a clear statement of what the new site must achieve, in commercial terms.
UK agency costs. For a small to mid-sized business site of ten to twenty pages, budget between roughly £5,000 and £15,000 with a specialist web agency. More complex sites requiring e-commerce, custom integrations, or significant content migrations will sit higher. The wide variation in quotes you receive almost always reflects a wide variation in what is included. Ask explicitly about SEO migration work, conversion tracking setup, and post-launch support in every quote, because these three items are most commonly excluded from headline figures and are also the most consequential.
Timelines. A realistic timeline for a small to mid-sized site in 2026 is eight to fourteen weeks. Larger and more complex projects run twelve to twenty weeks. An agency promising a high-quality result in four weeks either has a very narrow scope in mind or has not thought through the content production and approval phases. Client-side delays in providing copy, approving designs, and supplying images are the single most common reason redesigns run over time. Build this into your planning from the outset and agree a content delivery schedule before development begins.
Red flags in proposals. No mention of SEO migration. No discussion of conversion goals or analytics setup. A very low quote with no explanation of exclusions. No examples of live sites with measurable results. These are not minor omissions. They are signals about how the agency thinks.
You are not buying a website. You are buying a lead generation asset with a specific, measurable job to do. Brief it in those terms.
The first 90 days after launch
Launch is the beginning of the performance phase, not the end of the project.
Open Google Search Console from day one and monitor it. Look for crawl errors, drops in impressions or clicks on your most important pages, and any manual actions. A drop in impressions in the first two to three weeks is often Google reprocessing the site after a significant structural change. Normal. A drop that has not recovered by week six or seven indicates something was missed in the redirect or indexing work.
Check Core Web Vitals scores in Search Console's Page Experience report, not just in a one-off testing tool. Real-world scores based on actual user data can differ significantly from the lab score a speed-testing tool produces. The report in Search Console is what Google is actually seeing.
Monitor conversion rate in GA4 from the first week. If tracking was set up correctly at launch, you have a baseline from the old site to compare against. If it was not set up, you are flying blind for the first quarter of the new site's life. That is a poor return on a significant investment.
Set a 90-day review with your agency or web team. What has improved. What is working. What needs adjustment. Post-launch iteration is normal and expected, not a sign the initial build failed. It is how good sites get better.
A redesign done well compounds over time: stronger rankings, cleaner AI visibility, a higher conversion rate, all reinforcing each other as the site builds authority. Done badly, it can undo years of accumulated search equity in a matter of weeks. The difference, almost every time, is whether search and conversion thinking was in the room from the first day of the brief, or called in afterwards to fix things.
Frequently asked questions about website redesigns
How long does a website redesign take?
For a small to mid-sized business site of around ten to twenty pages, eight to fourteen weeks is the realistic range with a specialist agency. Larger sites with e-commerce, custom functionality, or significant content migration tend to take longer, often twelve to twenty weeks. The most common cause of overruns is client-side delay in providing content, approving designs, or making decisions at key stages. Build this expectation into your planning and agree a content delivery schedule with the agency before development begins.
How much does a website redesign cost in the UK?
For a specialist web agency working on a ten to twenty page business site, budget somewhere between £5,000 and £15,000. More complex sites go higher depending on functionality and content volume. Very cheap quotes almost always mean SEO migration, conversion tracking, and post-launch support have been excluded from the scope. Ask specifically about all three in every conversation, because they are the items most commonly omitted and the ones most likely to determine whether the investment pays back.
Will I lose my Google rankings when I redesign my website?
You can lose rankings if the process is handled carelessly. Specifically: if URLs change without 301 redirects in place, if existing page titles are rewritten without checking which ones were earning clicks, or if the internal linking structure is rebuilt without auditing what was performing before. All of these are avoidable problems if search thinking is built into the brief from the start rather than added as a launch-day sign-off check.
What is the difference between a website redesign and a website refresh?
A refresh updates the visual presentation without changing the underlying structure: new fonts, updated colours, better photography. A redesign changes the structure, and often the URL architecture, the navigation, the page templates, and sometimes the platform itself. A redesign carries more risk and more potential upside. A refresh addresses purely visual concerns without triggering the SEO migration risks that a full rebuild involves. If the structure of the site is still serving you well, a refresh is often the smarter starting point.
How often should a business redesign its website?
The three-year rule is too mechanical. Redesign when Core Web Vitals scores fall below acceptable thresholds, when conversion rate drops significantly without a clear other cause, when the business has changed enough that the site no longer reflects what you do, or when the site consistently fails to appear in AI-generated answers for your core queries. Performance and commercial triggers are more reliable than a fixed calendar.
If you are planning a redesign, start here
A redesign is one of the highest-leverage investments a business makes in its digital presence. The businesses that come out ahead treated it as a search and conversion project first, and an aesthetic project second. They knew their current numbers before they briefed anyone. They asked hard questions about SEO migration, structured data, and conversion tracking before they signed.
The businesses that come out behind had the new site built, launched it, and found out three months later what had been lost in the process.
Free resource: Traffic Projection Report
If you are in the planning phase and want to understand what better search visibility and more traffic could mean for your enquiry volume, the Traffic Projection Report gives you a concrete starting point based on your current site. It is the right first step before writing the brief.
A site that is found, earns AI citations, and converts visitors into enquiries is not an accident. It is the product of a brief written with the right questions in it.
