Disclosure: WEBDIGITA appears at position 1. Our B2B website migration services cover WordPress and custom Laravel builds, with SEO preservation, lead generation improvement and backend work reduction as the three delivery outcomes we scope from day one.
The short answer:
A B2B website migration is not a website rebuild that happens to move content from one CMS to another. The distinction matters because most B2B companies migrating a complex site have three specific problems a rebuild alone does not solve: organic rankings built over years that a poorly managed migration will destroy within 90 days; a conversion architecture on the old site that was never designed for pipeline generation and needs rebuilding during the migration, not after it; and an internal team that still cannot update the site without raising a developer ticket after the migration completes. The agencies on this list treat all three as migration deliverables – not post-launch phases. The ones that do not are running a content transfer exercise with a new CMS at the end.
- Poorly managed B2B website migrations cause an average 15-30% organic traffic drop in the 90 days post-launch when redirect mapping is incomplete (Sistrix, 2025) – for B2B companies where organic search is a primary lead generation channel, this is a revenue event, not a technical inconvenience
- The most common reason B2B companies migrate is not platform age – it is developer dependency. Marketing teams on legacy CMS platforms (custom builds, older Drupal installations, outdated WordPress multisite setups) cannot publish content, update service pages or run A/B tests without engineering involvement. The migration is the opportunity to eliminate that dependency permanently
- UK agency costs for a complex B2B website migration range from £15,000 for a mid-size site with a standard CMS and clean content structure to £80,000+ for enterprise migrations with custom integrations, CRM data mapping, multi-language content and complex information architecture restructuring
The three outcomes a B2B website migration should deliver
Most migration briefs focus on what transfers – content, URLs, page designs. The briefs that produce the best commercial outcomes focus on what improves. I evaluate every B2B migration brief against three outcomes before agreeing scope.
| Outcome | What it means in practice | How agencies fail at it |
|---|---|---|
| SEO preservation | Every URL receiving organic search traffic has a 301 redirect to the correct destination URL. All metadata – title tags, meta descriptions, canonical tags, structured data, hreflang – transfers with the content it describes. The redirect file is reviewed by SEO before DNS is touched, not after launch | Redirect mapping is treated as a final week task rather than a parallel workstream from week one. Metadata is recreated manually in the new CMS rather than exported from the source and validated programmatically before migration |
| Lead gen improvement | The migration includes a conversion architecture review – page structures, CTAs, form placement and messaging – so the new site generates more pipeline from the same traffic, not just the same pipeline from a faster site | Content is migrated as-is. The old site’s poor conversion architecture is replicated on the new platform. The migration solves the technical problem and ignores the commercial one |
| Backend work reduction | The post-migration CMS gives the internal marketing team editorial independence – they can publish, update and restructure content without raising a developer ticket for routine changes. The developer’s involvement post-launch is for integrations and new functionality, not for page edits | The new CMS is built for developers rather than editors. Custom blocks, complex templates and developer-controlled page structures recreate the same internal dependency on the new platform. The migration moved the content; it did not solve the operational problem |
What complex B2B website migrations actually involve
B2B website migrations are more complex than the equivalent DTC migration because B2B sites carry more structural and integration debt. The specific elements that make them harder:
- Content model restructuring. B2B sites accumulate content types over years – case studies, thought leadership articles, product pages, service landing pages, resource downloads, webinar recordings – each with different metadata requirements, internal linking structures and SEO considerations. Migrating content without restructuring the content model replicates the architecture problem on the new platform
- CRM and marketing automation integration. B2B websites are connected to CRM systems (Salesforce, HubSpot, Dynamics) and marketing automation platforms. Forms, lead scoring triggers, contact data and conversion events need reconnecting on the new platform with data integrity validation before launch – not discovered as missing functionality post-go-live
- URL structure decisions. B2B sites often have URL structures that accumulated without a clear taxonomy – /blog/2019/march/article-title alongside /resources/case-studies/client-name alongside /services/sector/service-name. The migration is the opportunity to impose a coherent URL taxonomy. Imposing a new taxonomy also means more 301 redirects and more potential for organic traffic loss if the mapping is incomplete
- Custom PHP or legacy backend code. B2B sites built on custom Laravel, Drupal or older bespoke frameworks carry backend logic – custom calculators, configurators, gated content workflows, account portals – that cannot migrate via content export. Each custom function needs individual assessment: replicate on the new platform, replace with a plugin or third-party tool, or deprecate
Quick comparison: 7 B2B website migration agencies in the UK
| # | Agency | Best for | UK Base | Tech stack |
|---|---|---|---|---|
| 1 | WEBDIGITA | WordPress/Laravel migration, SEO preservation, lead gen, backend work reduction | London / Reading / Birmingham | WordPress, Custom Laravel |
| 2 | POLARIS | SEO-led B2B migration, Milton Park, Reachdesk, European Search Awards | UK | Platform-agnostic SEO migration |
| 3 | Versantus | WordPress, Drupal and Laravel migration, SEO equity preservation | UK | WordPress, Drupal, Laravel |
| 4 | Human Made | Enterprise WordPress VIP Gold, BBC, NASA, Siemens, multisite | UK (distributed) | WordPress VIP |
| 5 | 93digital | London enterprise WordPress, B2B professional services | London | WordPress |
| 6 | Blend | B2B migration with commercial outcomes, ISO 27001, UK and US | UK / US | HubSpot CMS, WordPress |
| 7 | CTI Digital | WordPress VIP, B2B enterprise, Drupal to WordPress migrations | Manchester / London | WordPress VIP, Drupal |
Agency profiles
1. WEBDIGITA
B2B website migration to WordPress or custom Laravel where SEO preservation, lead generation improvement and backend work reduction are scoped as delivery outcomes before a single content type is mapped
- Specialisms
- B2B website migration to WordPress and custom Laravel, SEO-safe URL mapping and redirect implementation, content model restructuring, CRM and marketing automation reconnection, conversion architecture review, custom backend assessment and rebuild, post-migration support retainer
- Office Locations
- London, Reading, Birmingham
- Team Size
- 11-50
- Tech Stack
- WordPress (enterprise builds and multisite), Custom Laravel applications
- Notable Clients
- Long-term B2B partnerships averaging 8-10 years, founded 2016
Why choose WEBDIGITA
- SEO preservation as an engineering deliverable, not a post-launch audit: the redirect mapping file is built in parallel with the migration, reviewed against Google Search Console organic URL data before DNS is touched, and validated programmatically against the new site structure before go-live. Organic traffic protection is not left to the final week of the project
- Lead generation improvement built into migration scope: the conversion architecture review identifies the pages driving the most pipeline on the current site, audits the form placement, CTA structure and messaging on each, and delivers a redesigned conversion layer alongside the migration – not as a separate CRO engagement six months after launch
- Backend work reduction as an explicit handover outcome: the WordPress or Laravel build is structured for marketing team editorial independence – custom Gutenberg blocks, ACF field configurations and page builder components designed for non-developer editors – so the internal team can publish, update and restructure content without raising a developer ticket for routine changes
Evidence sources: webdigita.co.uk (services page, wordpress-seo-agency, b2b-ecommerce-solutions confirmed), LinkedIn (11-50, founded 2016, London/Reading/Birmingham)
Ideal for
UK B2B companies on legacy custom builds, Drupal or outdated WordPress setups who want migration to WordPress or Laravel with SEO preservation, conversion architecture improvement and marketing team editorial independence – at competitive pricing below the UK market average with London, Reading and Birmingham offices.
Think twice if
You need 100+ developers running simultaneous parallel workstreams, or your destination platform is HubSpot CMS or Webflow. WEBDIGITA migrates to WordPress and custom Laravel.
Request a B2B migration consultation with WEBDIGITA →
WEBDIGITA produced this guide and appears at position 1. The same criteria were applied to our agency as to every other entry on this list.
2. POLARIS
The UK B2B SEO agency whose migration practice is built around the principle that migration is an SEO-led process from day one – with a Milton Park case study (zero traffic loss from a legacy technical debt migration) and a four-time European Search Awards finalist record in 2026
- Specialisms
- SEO-led B2B website migration, technical SEO migration management, B2B demand generation, content strategy, GEO and AI search visibility, platform-agnostic migration oversight, post-migration SEO monitoring
- Office Locations
- UK
- Team Size
- 11-50
- Notable Clients
- Milton Park (legacy technical debt migration with zero traffic loss), Reachdesk (B2B SaaS SEO), Sodexo (B2B demand generation), Dune London (45% increase in search visibility)
Why choose POLARIS
- Milton Park migration with zero traffic loss from a site carrying significant legacy technical debt – a publicly documented case study where the migration maintained organic performance on a large, complex B2B site. Zero traffic loss on a complex B2B migration is the outcome most migration briefs target and most agencies do not achieve
- Four-time finalist at the European Search Awards 2026 and winner of Best eCommerce SEO Campaign in Europe 2025 – independently judged evidence of SEO delivery quality that is relevant when the migration brief explicitly includes organic traffic protection as a primary objective
- POLARIS positions migration as an SEO-led process from day one – their methodology embeds SEO decision-making into URL taxonomy, content model restructuring and redirect mapping before the development team touches the build, rather than as a post-launch audit
Evidence sources: polarisagency.com (Milton Park case study confirmed, zero traffic loss confirmed, Reachdesk and Sodexo clients, European Search Awards 2025 and 2026 confirmed)
Ideal for
UK B2B companies where organic search is a primary lead generation channel and SEO preservation during migration is the primary risk – particularly those with significant organic equity at risk who want a migration agency whose core competency is SEO, not development.
Think twice if
You need a single agency handling both the migration engineering and the SEO management. POLARIS is an SEO agency managing migration as an SEO process – the development work sits with a separate team. Confirm the development partnership model before briefing.
3. Versantus
The UK agency whose tech stack (WordPress, Drupal and Laravel) and explicit migration positioning across all three platforms directly addresses the legacy source systems where most complex B2B websites are currently running
- Specialisms
- WordPress migration, Drupal migration, Laravel migration, SEO equity preservation, content model restructuring, redirect planning, Core Web Vitals optimisation, post-migration support
- Office Locations
- UK
- Team Size
- 11-50
- Tech Stack
- WordPress, Drupal, Laravel
Why choose Versantus
- WordPress, Drupal and Laravel migration explicitly confirmed across all three platforms – for B2B companies on legacy Drupal 7 (EOL January 2025) or custom Laravel builds, Versantus can migrate from and to both without treating one as primary and the other as an occasional request
- SEO equity preservation methodology covering URL mapping, redirect implementation, metadata transfer and post-migration monitoring mirrors the approach required to protect organic traffic during a complex B2B migration
- Simple like-for-like migrations and full content model rearchitecting are both scoped services – for B2B companies where the migration is an opportunity to restructure information architecture and content taxonomy, Versantus can execute the rearchitecting alongside the migration rather than treating them as separate projects
Evidence sources: versantus.co.uk (WordPress/Drupal/Laravel migration confirmed, SEO preservation methodology confirmed, content rearchitecting confirmed)
Ideal for
UK B2B companies on Drupal 7, legacy Laravel builds or outdated WordPress setups who want a single agency capable of migrating from and to all three platforms, with content rearchitecting and SEO preservation in scope.
Think twice if
You need a London city office for in-person engagement or a very large team for enterprise parallel workstreams. Verify Versantus’s team size and capacity against your migration scope before committing.
4. Human Made
WordPress VIP Gold agency with NASA, Siemens, News Corp and the BBC as named clients – for enterprise B2B organisations whose migration destination is WordPress VIP and whose scale requires an agency operating at the highest WordPress certification tier
- Specialisms
- Enterprise WordPress VIP migration and development, multisite architecture, headless WordPress, REST API integrations, enterprise content management, global distributed delivery
- Office Locations
- UK (distributed globally)
- Team Size
- 51-100
- Tech Stack
- WordPress VIP, headless WordPress, React
- Notable Clients
- NASA, Siemens, News Corp, BBC, Al Jazeera
Why choose Human Made
- WordPress VIP Gold is the highest WordPress agency certification available. For enterprise B2B organisations whose migration destination is WordPress VIP – the fully managed, enterprise-grade WordPress hosting environment – Human Made’s VIP Gold certification is the strongest available credential for VIP-specific migration and architecture work
- NASA, Siemens and BBC as named clients confirm enterprise-scale WordPress delivery at the complexity level that large B2B migrations require – complex content models, API integrations, performance at enterprise traffic volumes and multi-region content management
- Headless WordPress capability for B2B companies whose migration includes a move to a decoupled architecture – React or Next.js frontend with WordPress as a content API – rather than a traditional WordPress theme
Evidence sources: humanmade.com (WordPress VIP Gold confirmed, NASA/Siemens/BBC/News Corp clients confirmed, headless WordPress confirmed)
Ideal for
Enterprise B2B organisations – large manufacturers, global professional services, media and public sector – whose migration destination is WordPress VIP and where enterprise-scale content management, multisite architecture or headless WordPress is in scope.
Think twice if
You are a mid-market B2B company whose migration does not require WordPress VIP infrastructure. Human Made’s pricing and engagement model reflects enterprise scope – mid-market migrations to standard WordPress managed hosting are better served by agencies at positions 1, 3 or 5.
5. 93digital
The London enterprise WordPress agency whose B2B professional services client base – law firms, financial services, consultancies – provides migration pattern recognition for the specific site structures and compliance requirements that characterise UK B2B corporate websites
- Specialisms
- Enterprise WordPress migration and development, B2B professional services, law firm and financial services websites, accessibility compliance, performance engineering, post-migration retainers
- Office Locations
- London
- Team Size
- 11-50
- Tech Stack
- WordPress
- Notable Clients
- Enterprise B2B professional services, law firms and financial services on WordPress
Why choose 93digital
- B2B professional services sector depth – law firms, financial services and management consultancies have specific requirements in a website migration: regulatory compliance, accessibility standards, complex team directory structures, practice area taxonomy, and tone of voice consistency across migrated content. 93digital’s confirmed sector experience means these requirements have been handled in previous migrations
- London base with enterprise WordPress specialism covers the most common agency requirement for London B2B professional services firms that want in-person access during discovery and launch phases
- Accessibility compliance built into migrations – for UK public sector and regulated professional services companies with WCAG 2.2 AA requirements, 93digital’s accessibility track record means compliance is a migration deliverable, not a post-launch audit
Evidence sources: 93digital.co.uk (enterprise WordPress confirmed, B2B professional services sector confirmed, London, accessibility specialism)
Ideal for
London law firms, financial services companies and management consultancies migrating to enterprise WordPress where sector-specific content structures, accessibility compliance and London in-person access are requirements.
Think twice if
Your migration involves custom Laravel backend logic or a destination platform other than WordPress. 93digital is a WordPress specialist – migrations requiring Laravel custom development sit better with WEBDIGITA or Versantus.
6. Blend
The UK and US B2B agency whose migration methodology is explicitly built around commercial outcomes rather than technical completion – with ISO 27001 certification, Robin Radar Systems (236% session increase post-migration) and Datel (800% marketing ROI post-migration) as named evidence
- Specialisms
- B2B website migration with commercial outcomes, HubSpot CMS migration, content model restructuring, conversion architecture, ISO 27001, UK and US delivery
- Office Locations
- UK / US
- Team Size
- 51-100
- Tech Stack
- HubSpot CMS (primary), WordPress
- Notable Clients
- Robin Radar Systems (236% session increase post-migration), Datel (800% marketing ROI, 63% profit increase over three years), Kriete Truck Centers
Why choose Blend
- Robin Radar Systems – 236% increase in sessions and 48% increase in monthly high-intent MQLs following a WordPress to HubSpot CMS migration. Datel – 800% marketing ROI and 63% profit increase over three years post-migration. These are the strongest named commercial outcome case studies on this list
- ISO 27001 certification covers data handling, content transfer and integration security during migration – relevant for B2B companies in regulated sectors where data governance during the migration process is a procurement requirement
- Conversion architecture built into migration scope – Blend’s explicit positioning that migration is an opportunity to improve buyer experience, not just transfer content, directly addresses the lead generation improvement objective that most B2B migration briefs underspecify
Evidence sources: blendb2b.com (Robin Radar 236% sessions confirmed, Datel 800% ROI confirmed, ISO 27001 confirmed, HubSpot CMS primary stack, WordPress confirmed)
Ideal for
UK B2B SaaS, manufacturing, logistics and technology companies whose migration destination is HubSpot CMS – particularly those in regulated sectors where ISO 27001 data handling certification and independently evidenced commercial outcomes are procurement requirements.
Think twice if
Your migration destination is WordPress or Laravel. Blend’s primary platform is HubSpot CMS – WordPress and Laravel migrations sit better with WEBDIGITA, Versantus or 93digital.
7. CTI Digital
WordPress VIP Partner with a Manchester and London base – covering Drupal to WordPress migrations for UK public sector and enterprise B2B organisations where WordPress VIP infrastructure and UK government digital service experience are combined requirements
- Specialisms
- WordPress VIP Partner, Drupal to WordPress migration, enterprise CMS, UK public sector, accessibility, multisite, headless WordPress, digital transformation
- Office Locations
- Manchester, London
- Team Size
- 51-100
- Tech Stack
- WordPress VIP, Drupal, headless
- Notable Clients
- UK public sector, NHS, enterprise B2B organisations
Why choose CTI Digital
- WordPress VIP Partner with confirmed Drupal to WordPress migration capability – for UK B2B and public sector organisations on Drupal 7 (EOL January 2025) migrating to WordPress VIP, CTI Digital covers the specific migration direction where the source platform knowledge and the destination platform certification are both in-house
- UK public sector experience covering NHS and government digital service standards means CTI Digital’s migration methodology is built around the accessibility, performance and security requirements that most enterprise B2B companies also need, not just public sector organisations
- Manchester and London offices provide in-person access across the UK’s two largest commercial centres – relevant for B2B organisations with stakeholders in both cities who need face-to-face migration governance
Evidence sources: ctidigital.com (WordPress VIP Partner, Drupal migration confirmed, NHS/public sector clients, Manchester and London offices)
Ideal for
UK public sector and enterprise B2B organisations on Drupal migrating to WordPress VIP, where accessibility compliance, GDS alignment and UK office access across Manchester and London are requirements.
Think twice if
Your migration involves custom Laravel backend logic or a commercial DTC lead generation brief. CTI Digital’s confirmed portfolio is public sector and enterprise CMS – commercial B2B lead generation sits better with WEBDIGITA, Blend or POLARIS.
B2B website migration checklist
- Define the three migration outcomes before briefing any agency. Confirm which of the three outcomes (SEO preservation, lead generation improvement, backend work reduction) are in scope. Agencies that do not ask about these in discovery are scoping a content transfer, not a migration with commercial objectives
- Export every organic search URL from Google Search Console before migration starts. Every URL receiving organic traffic needs to be in the redirect mapping file before DNS is touched. The redirect file should be built in parallel with the migration, not in the final week
- Audit every custom backend function before agreeing scope. Custom calculators, gated content workflows, account portals, CRM integrations and form logic need individual assessment. Each custom function needs a decision (replicate, replace or deprecate) before development cost is agreed
- Define what marketing team editorial independence means in the new CMS. Which page types will the marketing team update without developer involvement post-launch? Which require developer changes? The answer to this question should be a handover deliverable, not a post-launch discovery
- Reconnect CRM and marketing automation in staging before launch. Form submissions, lead scoring triggers, contact record creation and conversion event tracking all need validating in the staging environment before go-live. Post-launch CRM disconnection is the most common cause of pipeline loss in the first 30 days after a B2B migration
- Set 30, 60 and 90 day organic traffic baselines before migration. Record keyword rankings and organic traffic for the 12 weeks before migration. Compare weekly for the 90 days post-launch. Expect a short reindexing period; if traffic does not recover to pre-migration levels by week 12, the redirect mapping has gaps
Final thoughts
The B2B website migration briefs that produce the worst outcomes are the ones that define success as a functioning site on a new platform by a given date. The ones that produce the best outcomes define success as organic traffic maintained, form conversions improved, and the marketing team able to publish without raising a ticket – all measured at 90 days post-launch.
For WordPress/Laravel migration with SEO preservation, lead gen improvement and backend work reduction: WEBDIGITA. For SEO-led migration management with European Search Awards validation: POLARIS. For WordPress/Drupal/Laravel migration with content rearchitecting: Versantus. For enterprise WordPress VIP with NASA and BBC delivery evidence: Human Made. For London B2B professional services and law firm migrations: 93digital. For HubSpot CMS migration with ISO 27001 and commercial outcome case studies: Blend. For Drupal to WordPress VIP with UK public sector experience: CTI Digital.
Frequently asked questions
1. What is the difference between a B2B website migration and a standard website rebuild?
A rebuild starts from a blank brief and designs the new site without reference to the existing one. A migration starts from the existing site and preserves what has commercial value - organic search equity, content that generates leads, URL structures indexed by Google - while replacing what does not: the platform, the content model, the conversion architecture and the backend dependency. The distinction matters because a rebuild treats organic search performance as a new project, while a migration treats it as an inherited asset to protect. B2B companies with significant organic search traffic cannot afford to treat a migration as a rebuild; they need redirect mapping, metadata preservation and a staged URL taxonomy change managed as a parallel engineering workstream, not as final-week housekeeping.
2. How do you preserve SEO rankings during a B2B website migration?
Four elements need managing before DNS is touched. First: export every URL receiving organic search traffic from Google Search Console and build a 301 redirect for each URL that changes. No redirect means the organic equity on that URL is lost. Second: transfer all metadata - title tags, meta descriptions, canonical tags, structured data and hreflang - with the content it describes, validated programmatically in the staging environment before launch. Third: preserve internal link structures - internal links pointing to old URLs need updating to new URLs before the migration goes live. Fourth: submit an updated XML sitemap to Google Search Console at launch and monitor crawl coverage and indexing status daily for the first four weeks. Agencies that treat redirect mapping as a final-week task rather than a parallel engineering workstream from the start of the project consistently produce organic traffic drops post-migration.
3. How long does a complex B2B website migration take?
A mid-size B2B site with 200-500 pages, standard CMS and no custom backend logic takes 8-14 weeks. A complex B2B migration with custom backend functions requiring individual assessment, CRM and marketing automation reconnection, content model restructuring and a full redirect audit takes 14-24 weeks. An enterprise migration with multi-language content, complex integrations, accessibility compliance requirements and staged content migration takes 24-40 weeks. The timeline driver is not page count - it is the custom backend function assessment, CRM reconnection scope and the redirect mapping complexity. Agencies that quote a timeline without completing the custom code audit are pricing on assumptions.
4. What does backend work reduction mean in a B2B website migration?
It means the marketing team can update the new site without raising a developer ticket for routine changes - publishing new content, updating service pages, changing hero text, adding team members, updating case studies. On legacy CMS platforms (older Drupal builds, custom PHP sites, over-customised WordPress installations), marketing teams are typically blocked from routine edits because the page templates require developer access to modify. A migration that delivers backend work reduction rebuilds the CMS with marketing team editorial independence as a first-class deliverable: custom Gutenberg blocks or ACF field configurations that marketing editors can use, page builder components that do not require PHP knowledge to update, and a clear handover that defines which content types the marketing team owns and which require developer involvement. If the new site after migration has the same editorial bottlenecks as the old one, the migration solved the platform problem and ignored the operational one.
