What are the five stages of website development?

The five broad phases of a web project are defining requirements, including the specification; planning, including the site structure and design; development in staging; testing and client acceptance; and launch followed by monitoring. A redesign adds an audit before planning to identify what should be retained.

How can you protect SEO during a redesign?

To protect organic rankings during a redesign, create a complete 301 redirect plan before launch, retain traffic-generating URLs wherever possible, export Search Console data to identify priority pages and monitor Search Console every day for the first 30 days after launch.

Why choose a specialist agency for a website redesign?

A specialist agency provides a proven method, multidisciplinary expertise in SEO, UX and performance, and structured post-launch support. It has experience of complex situations and the tools needed to avoid expensive mistakes, particularly in redirects and content migration.

Website Redesign Checklist: 50 Essential Checks for 2026

Q: How much does a website redesign cost?

In France in 2026, expect to pay €2,000 to €6,000 for a brochure website, €5,000 to €15,000 for a corporate website and €8,000 to €25,000 for an e-commerce site. The budget varies with the number of pages, features and volume of content to migrate.

📌 Key takeaways

A successful redesign follows a structured nine-step checklist, from the initial audit through to post-launch monitoring.
Plan 301 redirects and the SEO structure before development begins to avoid losing rankings.
The audit sets the project up for success by showing what already works before anything is changed.
Monitoring KPIs for 90 days after launch helps you spot and correct traffic losses quickly.

A website redesign is a complex project with technical, visual and commercial implications. Changing the design without considering SEO, migrating the CMS without preparing redirects, or starting again without analysing the existing site are all avoidable mistakes that cost traffic and money. This website redesign checklist covers nine essential steps, with practical checks for every phase. It is designed for small-business owners, marketing managers and anyone leading a redesign without a dedicated technical team.

What is a website redesign?

A website redesign involves restructuring and modernising an existing site so that it better meets current web standards and visitors' expectations. Unlike building a site from scratch, a redesign retains useful assets such as the domain name, product database and high-performing content, while rethinking the architecture, design and performance. According to a Sweor study (2025), 75% of internet users judge a company's credibility by its website design. An ageing site therefore sends a negative signal before a visitor has read a single line. A redesign is a strategic response to that reality, not merely a cosmetic facelift.

The different types of website redesign

Before you begin, define the exact scope of the project. Confusing a visual refresh with a technical redesign leads to underestimated budgets and timelines. There are four broad categories, each with its own implications:

Full redesign: A complete overhaul of the design, architecture, features and sometimes the technology, including a change of CMS. Typical duration: three to six months.
Partial redesign: Targeted changes to specific sections or features, such as the checkout, customer area or blog. This is less risky for SEO.
SEO redesign: Optimisation of the URL structure, internal linking, metadata and content to improve organic rankings. See our <a href="/en/blog/seo-website-redesign-guide">SEO redesign guide</a>.
Visual redesign: Modernisation of the design and visual identity without changing the technical structure. SEO risk is low if the URLs remain the same.

Choosing the right type of redesign prevents the project and budget from becoming unnecessarily large

Why redesign a website?

Web standards evolve quickly. A site built in 2018 with no major updates will often have poor Core Web Vitals, a weak mobile experience and a dated design. Google has considered these signals in its algorithm since the Page Experience update in 2021, strengthened in 2023. User expectations have changed too: 53% abandon a mobile page that takes more than three seconds to load (Google, 2024). A redesign becomes necessary when these problems hold back conversions or rankings stagnate despite sustained content work.

Falling organic traffic: Your site is losing rankings despite regular content, indicating a technical or structural problem.
Low conversion rate: Visitors arrive but do not get in touch or place an order, revealing UX friction that needs attention.
Outdated design: A site that fails to inspire trust drives visitors away before they read the content.
Poor mobile compatibility: Google uses mobile-first indexing. A poorly adapted site undermines its entire organic search performance.
A change in positioning: A new audience, market or message needs to be reflected on the website.
CMS migration: Moving from WordPress to a headless CMS, or from PrestaShop to Shopify, requires a structured redesign.

The nine essential steps in a successful redesign

This is the complete process for delivering a website redesign. Each step is a distinct project phase with clear deliverables. Following this order avoids expensive rework and protects existing organic rankings. For a detailed look at every phase, read our guide to the stages of a website redesign.

The nine key steps in a successful website redesign

Step 1: Write a project specification

The project specification is the foundation of your redesign. Without it, each contributor, including the agency, developer and designer, works from different assumptions, creating misunderstandings and revisions along the way. It should set measurable objectives, such as a target conversion rate, desired SEO positions and a maximum load time, as well as the budget, timeline, technical constraints, hosting, required CMS, third-party integrations and user personas. Our website redesign specification guide includes a complete template you can adapt.

SMART objectives: traffic, leads, conversions and brand awareness
Total budget broken down by workstream: design, development, content and SEO
A timeline with approval milestones and a target launch date
Technical constraints: CMS, hosting and integrations such as CRM, ERP and analytics
User personas: who your visitors are and what they are searching for
Legal requirements: GDPR, legal notices and WCAG accessibility

Step 2: Audit the existing website

The audit is the most underestimated stage of a redesign. Rebuilding a website without examining what is already there is like rebuilding a house without knowing which parts are structurally sound. The audit covers four areas: technical performance, including Core Web Vitals, load times and crawl errors; SEO, including ranking URLs, backlinks and content structure; UX, including bounce rates by page, conversion paths and heat maps; and content, including pages to retain, merge or remove. According to Ahrefs (2025), 90.63% of web pages receive no organic traffic from Google, often because they have never been audited or optimised. Our website audit guide explains the tools and method step by step.

Run a complete crawl with Screaming Frog or Sitebulb to identify 4xx and 5xx errors, redirect chains and duplicate content
Export Google Search Console data on clicks, impressions and positions to identify ranking pages that must be preserved
Analyse backlinks with Ahrefs or Semrush to map inbound links that must not be broken
Check Core Web Vitals in PageSpeed Insights for the five most-visited pages
Audit UX with Google Analytics and Hotjar to identify pages with high bounce rates
Create a content inventory listing every URL and its status: retain, merge, remove or redirect

Step 3: Plan the site structure

The site structure defines how visitors will navigate the new website. A strong structure meets two criteria: it is intuitive for users, who can find what they need within two or three clicks from any page, and logical for Google, with important pages close to the root and internal links distributing authority. In practice, first map the content hierarchy on paper or in MindMeister, validate it with three to five target users through a card-sorting exercise on CardSorting.io, then refine it before development begins. Changing the structure after development is expensive in both time and redirects.

Keep important pages within three levels of the homepage: homepage > category > page
Use short, descriptive URLs such as /services/website-redesign rather than /page?id=142
Target one clear search intent per page and avoid duplicating intent
Include breadcrumbs on every internal page for both SEO and UX

Step 4: Define the design

The design phase begins with a creative brief documenting the brand identity, including visual guidelines, typefaces and colours, alongside references to websites that inspire you. Designs progress through several levels: low-fidelity wireframes to approve the structure, high-fidelity mock-ups to approve the visual direction and an interactive prototype to test key journeys. Good web design in 2026 follows WCAG 2.2 accessibility principles, incorporates design-system tokens for cross-device consistency and provides dark and light variants where relevant. Nielsen Norman Group (2024) reports that users spend 80% of their time looking at the left half of a page, so the visual hierarchy should take that behaviour into account. For conversion-focused projects, our SEO redesign guide explains the UX principles that affect rankings.

Step 5: Create a staging environment

Staging is an isolated development environment, accessible only to the project team, where the new site can be built and tested without affecting the live version. It is a necessity, not an optional extra. Without staging, fixing every bug on the live site creates a risk of downtime and a poor visitor experience. Block search engines from the staging environment using a robots.txt file with Disallow: / and a noindex meta robots tag, so that Google does not index an incomplete version before launch. Migrate content, images and metadata to staging, then approve every page before switching over.

Use a subdomain such as staging.example.com or a temporary domain
Restrict access by IP address or HTTP authentication
Set robots.txt to Disallow: / and add a noindex meta tag to every page
Approve migrated content page by page using a tracking sheet
Test third-party integrations, including payments, forms, CRM and analytics

Step 6: SEO structure and redirects

This is where most redesigns lose traffic. If a URL changes without a 301 redirect, Google loses the value of its inbound links and history. The resulting fall in rankings can last three to six months. According to a Semrush analysis (2025), 68% of sites that lost traffic after a redesign had no complete redirect plan in place when they launched. The absolute rule is to map every old URL to its new destination before launch day. Screaming Frog and Google Search Console let you export all indexed URLs. Every URL with Search Console clicks in the past 90 days is critical and needs a redirect. You should also optimise the meta title and description on each new URL while retaining the keywords that already rank. Our SEO redesign guide covers redirect planning and validation checks in detail.

A redesign without a redirect plan can lose 40% to 60% of its organic traffic within weeks. Every changed URL without a 301 redirect represents an immediate loss of ranking value.

Export every indexed URL from Screaming Frog and Google Search Console
Create a mapping sheet from each old URL to its new URL, or a 410 status for removed pages
Configure server-side 301 redirects for every changed URL and test them with httpstatus.io
Retain or improve the meta title and description on ranking pages
Update the XML sitemap and submit it to Google Search Console as soon as the site launches
Set a canonical tag on each new URL to prevent duplicate content

The redirect plan is the most important SEO document in a website redesign

Step 7: Build the approved designs

During implementation, the approved designs are turned into a working website. The build must follow clear standards for performance, accessibility and maintainability. For performance, optimise images as WebP with lazy loading, minify CSS and JavaScript, and load fonts asynchronously. For accessibility, image alt text, form labels and keyboard navigation are WCAG 2.2 prerequisites. Test compatibility across Chrome, Firefox, Safari and Edge, as well as desktop, tablet and mobile devices, using real devices rather than DevTools alone. Lighthouse, built into Chrome, can validate Core Web Vitals throughout development.

Convert images to WebP, optimise their dimensions and provide alt text
Target LCP below 2.5 seconds, CLS below 0.1 and INP below 200 ms, in line with Google's 2025 Core Web Vitals thresholds
Minify CSS and JavaScript and remove unused files
Test compatibility in Chrome, Firefox, Safari and the two latest versions of Edge
Forms: associate labels with fields, provide clear error messages and confirm submission
Configure the relevant Schema.org types, including Organization, BreadcrumbList and Article

Step 8: Test the staging website

Before launch, a complete test cycle confirms that the site works as intended in every scenario. Do not cut this phase to save time: a production bug costs four to five times more to fix on average than one found in staging (NIST, Software Defect Cost Report 2024). Testing covers business-critical features such as forms, checkout and customer accounts; performance in Lighthouse and GTmetrix on priority pages; browser compatibility; and accessibility. A formal acceptance checklist, signed by the client before launch, protects everyone involved and prevents post-launch misunderstandings.

Functional testing: every form, CTA button, link and business-critical feature
Performance testing: a mobile Lighthouse score above 80 for the main pages
Compatibility testing in real browsers and on real devices, including iOS Safari and Android Chrome
Accessibility testing with WAVE or Axe to identify blocking WCAG errors
301 redirect testing: verify every old URL with a redirect checker
DNS and HTTPS validation: configure the SSL certificate, enable HSTS and eliminate mixed content
Formal client acceptance and sign-off before launch

Step 9: Monitor KPIs and analyse performance

Launch is not the end of the project; it marks the start of measurement. The first few weeks after a redesign are critical for SEO: Google recrawls the new URLs, reassesses the structure and may temporarily move rankings. Daily monitoring in Google Search Console for the first 30 days lets you spot traffic falls quickly and identify URLs omitted from the redirect plan. Beyond SEO, monitor business KPIs such as conversion rate by source, bounce rate by page, session duration and goals configured in Google Analytics 4. Schedule reviews at 30, 60 and 90 days after launch.

Google Search Console: check index coverage, crawl errors and rankings by page every day from day 1 to day 30
Google Analytics 4: review traffic by channel, conversion rates and exit pages
Configure Search Console alerts for traffic falls greater than 20% compared with the previous week
Track positions for the ten priority keywords with Semrush or Ahrefs
Produce a 30-day report covering SEO rankings, conversions and production Core Web Vitals

Client examples: two SMEs that redesigned successfully

These two examples show the practical impact of a well-managed redesign, using figures measured within 90 days of launch.

Accountancy firm, Lyon (12 employees): A 2017 WordPress site that was not mobile-friendly and generated no inbound leads from the web. Following an SEO audit, the full redesign in SvelteKit retained the eight traffic-generating pages, reorganised content into topical silos and mapped redirects for 47 URLs. After 90 days, the mobile Lighthouse score had risen from 38 to 91, organic traffic was up 230%, and the form generated seven to 12 enquiries a month. The €4,800 investment paid for itself within four months.

Cosmetics e-commerce shop, Bordeaux (three employees): A migration from PrestaShop 1.6 to Shopify for maintenance reasons. The project needed redirects for 1,200 product URLs, 340 of which had active backlinks according to Ahrefs. A comprehensive redirect plan was combined with improved product pages, including WebP images, richer descriptions and Product schema. After 60 days, organic traffic was stable, with a fall of less than 3%; the redesigned checkout increased the conversion rate by 18%; and Core Web Vitals improved from "Poor" to "Needs improvement". Online revenue rose by 27% in three months.

How much does a website redesign cost?

The budget depends on the scope, technical complexity and resources involved, whether agency, freelance or in-house. The ranges below reflect French market prices in 2026. For a detailed analysis of the factors that affect the budget, read our article on website redesign costs.

Brochure website (5-15 pages): €2,000 to €6,000 for design, implementation and basic SEO
Corporate website (15-50 pages): €5,000 to €15,000 for a complex structure, content and integrations
E-commerce website (up to 500 products): €8,000 to €25,000 for product migration, checkout and payments
Factors that increase the cost: a large content migration, custom development, SEO copywriting and team documentation

Treat a redesign as an investment, not an expense. An optimised site that generates five additional qualified leads each month can quickly repay the difference between a discount supplier and a specialist agency. The real question is not "How much does the redesign cost?" but "How much is my current site costing in missed opportunities?"

Why choose a specialist agency?

A specialist redesign agency brings three things that a generalist or low-cost supplier cannot guarantee: a proven method with defined processes, deliverables and approval milestones; multidisciplinary expertise spanning SEO, UX, performance and accessibility within one project; and structured post-launch support. It has also handled complex situations, including high-risk migrations, sites with thousands of URLs and redesigns subject to legal constraints, so it knows how to avoid costly mistakes. To compare approaches and understand what distinguishes a strong proposal from a weak one, read our guide to the stages of a website redesign.

Conclusion

A successful website redesign is prepared before it is developed. The existing-site audit, project specification, SEO redirect plan and staging tests are not optional: they are the safeguards that prevent losses of traffic and budget. This checklist covers nine phases and 50 essential checks for managing the project methodically. If you remember only three priorities, protect your redirects, audit before removing content and measure performance for 90 days after launch. For more detail, read our website redesign specification guide or our article on website audits.

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Frequently asked questions

A redesign follows nine steps: write the project specification, audit the existing site, plan the structure, define the design, develop in staging, prepare the SEO redirect plan, build the approved designs, test and monitor after launch. Never skip the initial audit or redirect plan, as doing so puts existing organic traffic at risk.

Website Redesign Checklist: 9Steps and 50 Essential Checks