A bad website migration can wipe out months of work in a week. Almost 80 percent of SEO experts expect a hit after a migration even when it is planned carefully.
Again, the problem is not the move itself. It is everything around it that tends to get overlooked. Most teams only realize something went wrong after traffic and revenue already start to drop drastically.
At times like this, you need the backup of an agency that knows what usually breaks, what to check before it does, and how to plan for the risks. But choosing one is not easy. Most agencies say they do migrations and it is hard to tell who actually understands the technical and SEO side well enough to protect your growth.
We looked at this from that same lens and picked the best website migration agencies that approach your website with a strong SEO foundation, clear processes, and real experience handling complex moves, so you can compare your options and choose a partner that fits what you actually need.
Epic Slope: A founder-led growth agency for B2B SaaS and AI-native companies that builds SEO-ready platforms and manages migrations end to end, from content and CMS moves to redirects, indexing, and post-launch site health.
SEO Discovery: An SEO agency that specializes in keeping search rankings and traffic intact while you move platforms or hosting. They build redirect maps, optimise performance, and often improve speeds and uptime post-migration.
Delante: An SEO partner that guides migrations step by step, from planning and data backup to redirect mapping and post-launch checks. They make sure SEO doesn’t get overlooked during the move.
Stella Rising: A full-service SEO agency that treats migrations as a detailed process, using audits and checklists to make sure new URLs, content structure, and redirects preserve your rankings.
Salt Agency: A technical SEO-focused agency that safeguards organic search through careful planning and collaboration, keeping traffic stable at every stage of the migration.
Inflow: A digital marketing team that manages migrations without losing traffic and lays the groundwork for long-term SEO growth using a phased approach to make sure nothing slips through the cracks.
Epic Slope is a founder-led growth agency built around B2B SaaS and AI-native companies.
The team is made up of senior specialists who stay closely involved in the work, often operating as an extension of in-house marketing teams rather than an external vendor.
The focus is on building strong foundations first, then scaling what works. The work is built around technical SEO, content systems, and long-term growth foundations.
SEO Discovery is one of those old-school SEO agencies that has been around long enough to see every major algorithm update. Their identity is built around scale and process. They handle high volumes of SEO projects across many industries and focus on being reliable, structured, and affordable.
Delante is a European SEO agency that leans into data, research, and transparency. A big part of their identity is international SEO and working with brands across different markets and languages. They come across as very process-driven and serious about measurement.
Stella Rising is a full digital and media agency that works mainly with consumer brands. Their identity is built around combining brand, performance, and media under one roof. SEO is one part of a much bigger marketing system for them.
SALT is a technical SEO agency. They position themselves as problem solvers for complex search issues. Their brand is built around deep technical work, big audits, migrations, and international SEO.
Inflow is a performance-focused digital marketing agency with strong roots in ecommerce. Their identity is about combining SEO with paid media and CRO to bring in revenue. They usually work with growing ecommerce and lead-gen brands that want practical, measurable growth.
Mostly all teams will tell you they can move a site without breaking anything. That’s easy to promise. The harder part is knowing whether they actually understand what matters before the first file is copied.
A strong partner doesn’t start with tools or platforms. They start by asking what your business needs from the migration. Which pages drive revenue? Which workflows can’t fail? Which features actually matter to your team? Everything else follows from that, not the other way around.
Here’s what actually shows expertise:
If they jump straight into talking about CMSs or plugins, that’s a big warning. The right partner wants to know why you’re migrating, what success looks like, and what you’re willing to compromise on. Tools are just a means to an end.
Every approach has consequences. There’s always something faster but fragile, something safe but slower. You should hear those trade-offs clearly. If it sounds like everything is “easy” or “low risk,” they’re not thinking ahead.
Things break. Always. A good team has a plan ready before any work starts. That means if a critical page fails or an integration goes down, the site keeps running and recovery is immediate.
Not everything is worth bringing over. Old content, redundant plugins, low-value pages, are all distractions that slow everything down. The smart partner will call these out and help you focus on what actually matters.
Most migration headaches aren’t technical, but they’re about approvals, content updates, or other teams dragging their feet. A partner who flags these upfront saves you from nasty surprises and unrealistic timelines.
Complex technical decisions should never feel like a mystery. You should understand the implications of each choice without needing a translator. If you’re left confused, the partnership won’t last.
At the end of the day, a website migration isn’t just about moving files. It’s about protecting everything you’ve built and setting yourself up so the next stage of growth doesn’t start with a setback.
The agencies we’ve highlighted aren’t just good at migrations, they think ahead. They know where things usually break, what most teams miss, and how to plan for the stuff nobody even remembers to check. That’s what separates a move that’s “fine” from a move that actually preserves momentum.
Your focus should be on the questions they ask, not the tools they list. Are they digging into your goals? Flagging risks? Talking through dependencies? Do they explain trade-offs clearly and show what stays behind versus what moves forward? Those are the signs that they’re thinking like someone who’s done this dozens of times, and done it well.
Because when a migration goes wrong, you don’t just lose a week, you can lose months of hard-earned progress.
A detailed conversation is the fastest way to see if an agency clicks with your team. It shows you where you really stand and how well they get your goals. And if you’re still unsure, maybe start with Epic Slope. What if this call just finds exactly the partner your website has been waiting for?
It depends on the site and what needs to move. Simple migrations are cheaper. Big, complex sites with multiple domains, custom CMS setups, or lots of content take more time, and that shows in the price. The key is thinking about value. The wrong choice can cost less upfront but cost you traffic, rankings, and headaches later.
Small sites can move in a few weeks. Big sites, e-commerce stores, multi-language setups, or redesigns take longer. What matters is that the timeline is realistic, every stage is accounted for, and the agency doesn’t gloss over testing and post-launch checks.
Usually not. Your team’s needed for approvals, access, and context, but a good agency takes up the grunt work. They coordinate with your developers when necessary, but you shouldn’t have to pull them off other projects for weeks. It should feel like collaboration, not a takeover.
Tools are helpful, but they don’t think ahead. They move files, they follow rules. An experienced agency knows where migrations usually go wrong, what to check before it breaks, and how to preserve rankings, redirects, and SEO signals.
