The 12 Best Website Migration Agencies [2026]

You've decided you need support migrating your website to a new CMS. That's step one.

Here's step two, and it's the bit most "top agency" lists conveniently skip: a website migration agency isn't one thing.

An agency that's brilliant at moving a 40,000-SKU eCommerce catalogue between two headless platforms is not the agency you want moving a 60-page B2B site from WordPress into HubSpot CMS, and vice versa.

Different platforms, different risks, different skill sets.

Most lists of "the best migration agencies" solve this by ranking everyone against the same generic checklist - reviews, awards, years trading - and letting you work out the platform fit yourself.

We think that's backwards.

So instead of one flat list, we've split this one by destination CMS: HubSpot, WordPress, Webflow, Craft, Umbraco, and a couple of platform-agnostic SEO specialists for the migrations where the risk sits more in Google than in the build.

Before we get into it - yes, we're a HubSpot website design agency, and yes, we've included ourselves. We'll tell you exactly why, and we'll be just as straightforward about the other 11.

Full profiles, and our reasoning for each one, below.

What Counts as a "Website Migration," Exactly?

Quick clarification before the list, because "migration" gets used loosely and it changes which agency you actually need.

A domain migration moves your existing site to a new URL - a rebrand, a merger, or simply consolidating multiple domains into one. The site itself might barely change. The risk is almost entirely in redirect mapping and preserving the link equity you've built up under the old domain.

A CMS migration moves your content and structure from one platform to another - WordPress to HubSpot, Sitecore to Umbraco, and so on.

This is usually where the biggest technical risk sits, because URL structures, templates and how structured data gets generated can all change under the hood even if the front-end looks similar.

A redesign primarily changes the visual and UX layer, but - and this catches people out constantly - it can quietly affect URLs, page hierarchy and content in ways that carry real SEO risk, even when nobody involved thinks of it as a "migration" at all.

In practice, most projects are some combination of all three. We see this constantly: a client comes to us wanting to "just move the website," and by the time we've scoped it properly, they're also redesigning templates and restructuring navigation, because once you're rebuilding anyway, it's wasteful not to fix what wasn't working.

Nothing wrong with that - just be honest with yourself and any agency you're briefing about which one (or which combination) you're actually asking for, because it changes both the cost and the skill set required.

Why the Platform Matters More Than the Agency's Logo

We wrote a full breakdown of what a website migration actually costs, and the biggest driver in that piece wasn't the size of your site.

It was the platform you're moving to and, more specifically, whether that platform can do what your business actually needs it to do once the migration is finished. A migration isn't just "move Page A to Page B, keep the rankings, don't break anything" - although that's the bit everyone panics about, and rightly so.

It's also a decision about what your website is capable of for the next five years. Move from WordPress to another WordPress-adjacent platform and you've solved a hosting problem.

Move from WordPress into a CRM-native CMS and you've potentially solved a much bigger one: the gap between what your marketing team can see and what your sales team can see.

That's why "who's the best migration agency" is the wrong first question. The right one is "who's the best agency at migrating sites onto the specific platform I've already decided - or am seriously considering - moving to." This list answers that question.

It's also worth being honest about who tends to search for this term in the first place, because "website migration agency" gets typed into Google by two genuinely different people.

One is a marketing lead who's already picked a platform and just needs a safe pair of hands to execute it.

The other is earlier in the process - they know the current site isn't working, they suspect a migration is the answer, but they haven't landed on where they're migrating to yet.

If you're the second person, the platform sections below aren't just an agency list; they're a decent primer on what each option is actually good at, which might do more for your decision than any single agency's pitch will.

The 12 Best Website Migration Agencies, By CMS

HubSpot CMS

If your business already runs HubSpot for marketing, sales or service, migrating your website onto HubSpot CMS closes a gap that a lot of B2B companies don't realise they're living with: a website that captures data one way, and a CRM that needs it another.

Native CMS-CRM integration means every form fill, every page view and every conversion event lands directly against a contact record - no middleware, no sync delay, no "we'll build that integration eventually" backlog item.

It's also worth knowing that HubSpot CMS holds up well on the technical SEO side and on security, which tend to be the two biggest objections we hear from teams weighing it up against a familiar platform like WordPress. If you want a longer, purely HubSpot-focused rundown once you've narrowed things down, we've also published a full list of the top HubSpot website design agencies - this section is a shorter cut of that, specifically for migration work.

1. Axon Garside

We're a HubSpot Solutions Partner that only builds websites on HubSpot CMS, which means every migration we run is a platform we know inside out rather than one of five we juggle across the client base.

Our focus sits with engineering and manufacturing businesses, membership and professional bodies, and charities - organisations where the website has to represent a genuinely complex offer without becoming an unusable filing cabinet, and where connecting web data to CRM data is the whole point of the exercise, not a nice-to-have.

Our migration process is rooted in the belief that if a migration isn't structured properly, it tends to fail for the same reasons a CRM rollout does: no clear roadmap, and nobody owning the unglamorous middle steps.

Just something to think about. But if you've made your decision, get in touch with our team. (We've put a proper walkthrough of one of our own migrations further down the page, so you can see what this actually looks like rather than just taking our word for it.)

2. Huble

Huble is an Elite HubSpot Solutions Partner with a genuinely global footprint, which makes them a natural fit for larger B2B and enterprise organisations running teams across multiple time zones. Their website practice spans design, development and website migrations specifically, and they're comfortable with the kind of stakeholder complexity that comes with bigger organisations - multiple approval layers, brand guardians, and legacy systems that need careful unpicking before a migration can start.

If your migration is less about a single marketing site and more about consolidating a sprawling, multi-region digital estate, Huble's scale is a genuine advantage over a boutique agency. The trade-off, as with most agencies operating at that scale, is that you're less likely to be the biggest client in the room - worth weighing up if a close, high-touch working relationship matters as much to you as raw capability.

WordPress

WordPress remains the world's most common CMS, so a huge share of migration work is either moving away from it or moving between two WordPress-adjacent setups. The agencies that do this well at scale tend to specialise in exactly that: large, complex content migrations where a manual, page-by-page approach simply isn't viable.

3. Multidots

Multidots has built a specific reputation around large-scale CMS migrations, including the genuinely painful ones - shifting hundreds of thousands of content items off platforms like Drupal or Joomla and into WordPress without losing SEO value or corrupting data along the way. That's the kind of migration that keeps agency owners up at night, and it's become their specialism rather than an occasional side project.

They've also built out real strength in performance optimisation and security hardening post-migration, plus a focus on editorial workflows that means content teams don't inherit a beautiful new site they hate using day-to-day. If your migration involves a genuinely enormous content library, they're a sensible agency to have on the shortlist.

4. ClarityDX

ClarityDX (formerly 93digital) focuses almost exclusively on B2B - tech, SaaS, fintech and professional services - with a specialism in complex publishing at scale. Their headless architecture work, built on REST and GraphQL APIs, supports multi-channel publishing across web, mobile and connected applications, and their client list includes migrating one of the world's major banks onto WordPress, which is about as high-stakes as a migration gets.

They're a WordPress VIP Gold Agency Partner, which is a meaningful technical credential in enterprise WordPress circles, and their focus on corporate, media and financial services makes them a strong fit for organisations with regulatory or compliance pressure layered on top of the usual migration risk. Worth keeping in mind: their headless-first approach is a genuinely different way of building than most agencies on this list, so it suits businesses that want that flexibility more than it suits a straightforward brochure-site swap.

Webflow

Webflow migrations tend to come from a specific, recognisable pain point: marketing teams tired of raising a developer ticket every time they need a new landing page. Moving to Webflow trades some backend flexibility for genuine editorial independence, but done badly - particularly when migrating away from an SEO-heavy WordPress site - it's also one of the more common ways businesses accidentally lose half their organic traffic on launch day.

5. Spurwing

Spurwing position themselves as one of the UK's leading Webflow agencies and hold Webflow Premium Partner status, which gives them earlier access to the platform's more advanced features and a direct line to Webflow's own support. Their focus is on bespoke marketing websites and Webflow migrations for larger clients, particularly around custom CMS-driven builds and automated workflows rather than template-based sites.

If your migration is coming from a bloated, plugin-heavy legacy build and you want an agency that's genuinely specialised in Webflow rather than treating it as one of several platforms they dabble in, Spurwing's partner tier is worth the premium.

6. Lighthouse

Lighthouse specialise in turning content-heavy sites into streamlined, CMS-powered Webflow builds, with a particular emphasis on handing control back to in-house teams once the migration is done. Their published work shows improved site speed, security and editorial autonomy for clients moving off legacy platforms - exactly the trio of problems most Webflow migrations are trying to solve.

They're a good match for businesses migrating specifically because their current CMS has become a maintenance burden, rather than businesses chasing a purely visual refresh.

Craft CMS

Craft CMS occupies a specific niche: businesses that want a genuinely bespoke, content-modelled website without the plugin sprawl WordPress can accumulate over a decade. Migrations here are usually driven by exactly that frustration - a "custom coded website that causes issues," to borrow a phrase we hear constantly from prospects on legacy builds - and the agencies that specialise in Craft tend to be smaller, deeply technical shops rather than volume players.

7. A Digital

A Digital were one of the first UK-based official Craft CMS partners and have migrated more than 20 websites onto the platform from sources including ExpressionEngine, WordPress and Joomla. Their approach is built specifically around protecting search rankings during the move, which matters more with Craft migrations than most - because you're usually leaving behind a platform with years of plugin-driven SEO configuration that has to be rebuilt properly rather than assumed to carry across.

8. Mud

Mud, based in Bath, are one of the UK's longest-standing Craft CMS partners, with a decade of dedicated experience on the platform. Their positioning leans design-led - brand-first thinking paired with the technical depth to back it up - and their service list includes Craft-specific migration work alongside ongoing support, so you're not left managing a newly migrated site alone once the project wraps.

They're a strong fit for businesses that want their migration to double as a genuine brand and UX upgrade, not just a platform swap.

Umbraco and Enterprise .NET

If you're migrating away from an expensive enterprise CMS - Sitecore is the most common example, with licensing costs that can run into tens of thousands of pounds a year - Umbraco is the destination most UK organisations land on. It's built on the same Microsoft .NET and Azure foundations, so IT teams don't have to relearn an entire stack, but it drops the licensing overhead and the "you need three specialist developers just to change a template" problem that comes with the bigger enterprise platforms.

9. ClerksWell

ClerksWell are a long-standing Umbraco Platinum Partner offering end-to-end services spanning new builds, redesigns, migrations, upgrades and hosting. Their migration work specifically covers moves from Sitecore, WordPress, Kentico and Drupal into Umbraco, which is a broader range of source platforms than most competitors in this space cover credibly.

For digital, marketing and IT teams that want a long-term technical partner rather than a one-off supplier for the migration and then radio silence, ClerksWell's positioning around ongoing optimisation and support afterwards is a meaningful differentiator. Given how frequently Sitecore-to-Umbraco moves come with genuinely large content volumes - tens of thousands of items isn't unusual for organisations that have been on an enterprise CMS for years - their breadth across multiple legacy source platforms matters more here than in most other categories on this list.

10. Digital Wonderlab

Digital Wonderlab are another Umbraco Platinum Partner, which gives them direct access to Umbraco's product team and early release information - useful when you're planning a migration around a platform that's actively evolving. Their published work includes migrating organisations from Azure-hosted legacy setups onto Umbraco Cloud, with a strong emphasis on reducing hosting overhead as part of the move, not just the visual rebuild.

They've delivered projects across finance, education, health and the public sector, so they're comfortable with the governance and accessibility requirements that often come attached to enterprise migrations in those spaces.

Platform-Agnostic SEO Migration Specialists

Not every migration decision starts with "which CMS do we want." Sometimes it starts with "we cannot afford to lose the rankings we've spent five years building," and the platform is genuinely secondary to that risk. For migrations like this - particularly large, organic-search-dependent B2B or eCommerce sites - a specialist SEO agency managing the migration as a technical SEO process, working alongside (rather than instead of) your development team, is often the safer route.

11. SALT.agency

SALT.agency is one of the UK's most technically decorated SEO agencies, and their credentials on migration work specifically are unusually well-documented: preserving over 1,800 page-one keywords during a university website migration, and delivering significant post-migration organic growth for other clients. Their 2022 Queen's Award for Enterprise in International Trade is a government-assessed signal of business quality rather than a self-nominated industry award, which counts for something in a market full of the latter.

They're platform-agnostic by design, which makes them a strong fit if your migration risk sits more in "don't lose our rankings" than "we need a specific CMS built."

12. Edge45

Edge45, based in York, have built their migration methodology specifically around protecting the organic visibility that drives client revenue, rather than treating rankings as a secondary concern to the visual rebuild. Their own agency website migration is published as a detailed case study of the exact process they run for clients, and they've become a repeated go-to migration partner for at least one web development agency's own client projects - a strong peer-to-peer signal that their SEO handling holds up under someone else's scrutiny.

They're a sensible addition to a shortlist if your migration involves meaningful technical debt that needs unpicking carefully rather than just moved wholesale to a new platform.

A Real Migration, Start to Finish: Redway Networks

Most of the profiles above are, by necessity, third-party positioning and published case studies - we haven't run these agencies' migrations ourselves, so we're telling you what they say about themselves alongside what we could independently verify. For balance, here's one we can walk you through properly, because we did it.

Redway Networks came to us with a website that was roughly a decade old, running on WordPress, and doing the job well enough that nobody had been forced to deal with it - which is precisely the situation a lot of migrations start from. Nothing was on fire. It just wasn't pulling its weight anymore, and everyone involved suspected as much without quite being able to prove it.

The brief wasn't a straight lift-and-shift. It included:

• Discovery and user journey mapping, alongside SEO research to understand what was actually driving value on the existing site before any of it got touched.

• Expert interviews and stakeholder input, so the new structure reflected how the business actually sold, not just how the old sitemap happened to be organised.

• A full UX, copy and design refresh, moving away from a decade-old visual identity that no longer matched the business.

• A move onto HubSpot CMS, giving the internal team an editable, flexible build with A/B testing capability the old WordPress install simply didn't offer.

The result was a complete redesign with a new look and feel, improved content and imagery, and a stronger focus on search engine optimisation and customer experience throughout.

Redway's own words afterwards were that we'd understood their business from the start and they hadn't needed to explain the technology to us - which matters more than it sounds, because a migration where the agency is learning your sector from scratch is a migration where mistakes are more likely. They also told us they were pleased with the new site and had already seen benefits in increased visitor numbers.

It's a useful example precisely because it wasn't a rescue mission.

Nobody was in crisis. It's the more common version of "we need to migrate" - a perfectly functional but ageing site, on a platform that had quietly become a constraint rather than an enabler, moved properly rather than patched again.

How to Choose the Right Website Migration Agency

Picking from a list like this one isn't just about matching a platform to a logo. A few things are worth checking regardless of which CMS you've landed on.

Ask for migration-specific proof, not just general portfolio work. An agency can be excellent at new website builds and still be inexperienced at migrations, because the two disciplines overlap less than you'd think. A new build starts from nothing. A migration starts from something that already ranks, already converts, and already has years of accumulated technical decisions baked into it - some good, some you'll only discover once someone starts digging. Ask specifically for migration case studies, not just "websites we've built."

Check whether SEO is baked into the process or bolted on at the end. This is the single biggest predictor of whether a migration goes well. A proper migration involves URL mapping, a documented redirect strategy, and pre-launch testing before the new site goes live - not a rushed set of 301s the week before launch because someone remembered redirects exist. If an agency can't clearly walk you through their redirect and content-mapping process, that's worth pressing on before you sign anything.

Understand what happens in the weeks after launch, not just on launch day. Most migration issues surface in the first few weeks, not the first few hours. Make sure post-launch monitoring is scoped in as standard, not treated as an optional extra that gets quietly dropped when the budget gets tight.

Confirm whether you actually need to migrate your website to solve your real problem. This one's worth sitting with. Sometimes the underlying issue isn't the CMS at all - it's that your website and your CRM don't talk to each other. We've run projects, like our work with Legal Island, where the priority was a HubSpot CRM implementation integrated with their existing Craft CMS website and customer portal, rather than a full website migration. If your real pain point is disconnected systems rather than a genuinely broken CMS, that's a materially cheaper - and faster - problem to solve.

If you do decide HubSpot CMS is the right destination, our guide on how much a website migration actually costs breaks down realistic budget ranges by site size and complexity, so you're not going into agency conversations blind.

A few red flags worth noticing early

A handful of things tend to predict a rough migration before the project even starts, regardless of which platform or agency you go with:

• A quote with no separate line for redirects, SEO or testing. If "the build" is the only cost you're being shown, ask what's been left out - because something has.

• Vague answers about who's actually doing the work. If the person scoping your project isn't the person building it, find out who is, and ask to speak to them before you sign anything.

• No mention of what happens after launch. If post-launch monitoring isn't mentioned unprompted, it's probably not scoped in, and you'll be paying for it as a change request three weeks after go-live instead.

• A price that seems unusually low for your site's size. Cheap migrations are rarely cheap because the agency is efficient. They're cheap because redirects, content strategy or testing have been quietly trimmed.

Sector experience genuinely changes the outcome

This is worth a specific mention, because it's easy to treat as a soft, secondary factor when it's often the difference between a migration that goes smoothly and one that doesn't.

An engineering or manufacturing business typically carries a deep, technical product catalogue into a migration - spec sheets, quotation forms, a sales team that leans on the website heavily for tender generation. An agency that's never worked in that world will underestimate how much of the "content" is actually structured product data, not blog posts, and structured data is exactly the kind of thing that gets flattened or lost in a rushed migration.

Membership bodies, charities and training organisations carry a different flavour of complexity - renewals, CPD points, event bookings or donation flows that often live in two or three bolted-on external systems rather than the CMS itself. A migration here is frequently the moment those systems finally get pulled into one platform, which is a genuinely different scope of work to a straightforward content move, and an agency without relevant experience is liable to treat it as one anyway - right up until it isn't.

Ask any shortlisted agency directly whether they've handled a migration in your sector, and ask for a specific example rather than a general "yes, we've done a few." The difference between "yes, generally" and "yes, here's exactly what that involved" tells you most of what you need to know.

Frequently Asked Questions

What does a website migration agency actually do?

At minimum, a website migration agency audits your existing site's content and technical SEO value, plans a redirect and URL-mapping strategy, rebuilds or moves your content onto the new platform, and monitors performance closely after launch. The best ones also use the migration as an opportunity to fix things that were quietly holding the old site back - weak conversion journeys, disconnected integrations, or content nobody's touched in years - rather than just replicating what already existed on a new platform.

How much does a website migration cost?

It varies significantly by site size, platform and how much integration work is involved, but most B2B migrations in the UK fall somewhere between £8,000 and £70,000+. We've written a full cost breakdown covering typical ranges by site size, what actually drives the number up or down, and the hidden costs most people don't budget for.

How long does a website migration take?

For a mid-sized B2B site with a handful of integrations, expect somewhere between 8 and 16 weeks from discovery through to a stabilised launch. Larger, enterprise or multi-region migrations can run to several months. Post-launch monitoring should continue for at least a few weeks after go-live regardless of site size - that's when most issues actually surface.

Will I lose my Google rankings during a migration?

Not necessarily, but it's the single biggest risk of any migration, and it's almost always caused by the same handful of mistakes: incomplete redirect mapping, URL changes that break existing link equity, or pages accidentally blocked from crawling on the new platform. A properly planned migration, with redirects and technical SEO treated as core scope rather than an afterthought, should preserve your existing performance rather than reset it.

Do I need to migrate my CMS to fix a disconnected CRM and website?

Not always. If the core problem is that your website data and your CRM data live in separate systems, that's sometimes better solved through integration work on your existing platform rather than a full migration - it's worth having that conversation with a prospective agency before assuming a full rebuild is the only fix.

Should I migrate and redesign at the same time, or do them separately?

Most businesses end up doing both at once, and there's a reasonable argument for it: once you're rebuilding templates on a new platform anyway, doing the UX and content work at the same time avoids paying to migrate a design you were only ever going to replace a year later. The trade-off is that combining the two makes the project bigger and slightly harder to scope precisely upfront. If your current design is genuinely fine and it's purely the platform causing pain - cost, security, maintainability - a closer-to-lift-and-shift migration keeps things simpler and cheaper. If the site looks and reads like it's a decade old, as Redway Networks' did, doing both together is usually the better use of the budget.

Can I migrate my website myself, without an agency?

Technically, yes, if you've got in-house development capability and a genuinely simple site. Realistically, DIY migrations are where most of the "we didn't think redirects mattered that much" stories come from, because they tend to happen under time pressure with nobody dedicated to the unglamorous parts - content audits, redirect mapping, cross-device testing - that a specialist agency treats as core scope rather than nice-to-haves. Some platforms, including HubSpot, also offer native migration tooling on certain tiers, which can be a reasonable middle ground for small, largely brochure-style sites.

Where We Fit

We're not going to pretend we're neutral - we're a HubSpot-only agency, and we think that focus is exactly why our migrations tend to go smoothly rather than sideways. But whichever platform you land on, the questions in this guide will save you from the most common and most expensive migration mistakes: lost rankings, broken integrations, and a "finished" site that still needs six months of fixes before it actually works properly.

If HubSpot CMS is on your shortlist, take a look at our pricing guide for a realistic sense of what a migration built to grow with your business - not just survive the move - actually costs, or get in touch with our team to talk through your specific site.