If you run a digital or web agency, you have probably been here: a client site has outgrown its host, a reseller account is being shut down, or you are consolidating forty sites onto one properly built server. Someone has to move it all without breaking email, losing orders or waking the account manager at midnight. This guide explains how to pick the best server migration company for digital agencies, what to ask before you sign, and where a specialist server migration service fits against doing it yourself.
We are CloudHouse Technologies, so we are not a neutral party. We have written this as a buyer's guide you can use with any provider, including us, and we flag where figures are rough estimates rather than quotes.
Why Agency Migrations Are Different
A single company moving its own server has one stakeholder. An agency has many: every client site is someone else's revenue, and every outage lands on your reputation. Agency migrations tend to share a few traits.
- Many small sites, mixed stacks. WordPress, WooCommerce, Laravel, static builds and the odd legacy PHP site, often on different PHP versions.
- Client-owned DNS. You often cannot change records yourself, so cut-over timing depends on third parties.
- Email on the same server. Mailboxes, MX, SPF and DKIM records are easy to break and hard to notice until a client complains.
- White-label expectations. Clients should never see a third party's name or a messy hand-over.
- Tight windows. Campaign launches and seasonal sales leave few safe dates.
What Good Practice Looks Like
Hosting and migration guides published in 2026 agree on the same fundamentals, and any company you shortlist should be able to explain them without hesitation:
- Lower DNS TTL in advance. Common guidance is to drop the TTL on A records to around 300 seconds at least 24 to 48 hours before the move, so the switch takes effect quickly.
- Test on the new server before cut-over. Point your own hosts file at the new IP and check the site, forms, checkout and admin while the public still sees the old server.
- Run both servers in parallel. Propagation is not instant or uniform, so the old environment is typically kept available for 48 to 72 hours.
- Freeze writes during the overlap. Shops and membership sites should go read-only briefly so no orders land on the server being abandoned.
- Protect email. MX records can be overwritten during a nameserver change, which can make messages disappear silently, so mail needs its own checklist.
- Document first. Record PHP versions, cron jobs, database users, SSL files and DNS records before touching anything.
If a provider's proposal does not mention most of these, treat that as a signal to ask harder questions.
Your Options at a Glance
Agencies usually weigh five routes. The table summarises how they compare. Effort and risk ratings are our general assessment, not measured data.
| Option | Typical cost model | Effort for your team | Risk on client sites | Best for |
|---|---|---|---|---|
| DIY by your developers | Staff time only | High | Medium to high without a runbook | One or two simple sites |
| New host's free migration | Often free or bundled | Low to medium | Varies; usually limited to standard setups and little testing | Simple WordPress sites on common panels |
| Freelance sysadmin | Hourly or per project | Medium | Depends on the individual and availability | One-off moves with a trusted contact |
| Migration specialist (outsourced) | Per server, per site or fixed project quote | Low | Lower with a written plan, testing and rollback | Multi-site, mixed-stack or time-critical moves |
| Managed hosting with migration included | Bundled in a monthly plan | Low | Low, but you are tied to that platform | Agencies happy to standardise on one platform |
A free host migration is perfectly reasonable for a simple brochure site. The gap appears with custom stacks, large databases, Windows or IIS workloads, or sites where a few minutes of downtime has a real cost.
Vendor Evaluation Checklist for Agencies
Use this list when you collect proposals. A strong provider should answer every point in writing.
- Do they migrate both Linux and Windows servers, and do they support your control panels and stacks?
- Can they move multiple client sites in a planned order, not all in one risky weekend?
- Will they build a written plan covering DNS TTL changes, a testing step and a cut-over window?
- What is the rollback plan if something fails after cut-over?
- How is email handled: mailboxes, MX, SPF, DKIM and DMARC?
- Can the work be white-label, so your clients deal only with you?
- How do they keep access secure: temporary credentials, key-based access, and removal after the job?
- Will they sign an NDA or data processing agreement if client data is involved?
- Is there post-migration support, and for how many days?
- Is pricing fixed, per site or hourly, and what counts as out of scope?
- Who is your named contact during cut-over, and how can you reach them out of hours?
Questions That Separate Specialists From Generalists
"What happens to a client site that fails testing?"
A specialist explains how problems are logged and fixed on the new server before DNS changes. A generalist tends to say it should be fine.
"How do you handle sites with different PHP versions?"
Mixed stacks are normal for agencies. Look for a provider that audits versions up front and builds matching environments, rather than forcing everything onto the newest release and breaking older plugins.
"Can you work around client DNS?"
If a client controls their own domain, the provider should give you clear, copy-ready instructions for the client's IT contact and a way to verify the change.
"What will you not do?"
Honest providers state exclusions: fixing broken code, rebuilding themes, or recovering data that was already corrupt. Clear limits protect you from surprise invoices.
Planning a Multi-Site Agency Move
When you are moving dozens of client sites, order matters. Start with a low-risk pilot site, such as an internal or staging project, so you can validate the process before touching revenue-critical clients. Then group the rest by stack and risk: static and brochure sites first, shops and membership sites in their own quiet windows, and anything with client-owned DNS scheduled around the client's availability.
Agree a communication plan too. Tell account managers which sites move on which day, what clients should expect, and who to contact if something looks wrong. A migration that is technically perfect can still damage trust if the client hears about it for the first time from their own customers.
What You Should Receive at Hand-Over
- A written record of what was moved, including sites, databases, mailboxes and cron jobs.
- The final DNS records and confirmation that email is flowing.
- Notes on any differences between the old and new environments, such as PHP versions or caching.
- A short post-migration support window for issues that only appear under real traffic.
- Confirmation that temporary access has been removed and the old server is safe to cancel.
Do not cancel the old server until you have signed off on this list and the agreed overlap period has passed.
Rough Cost Expectations
Pricing varies widely, and published figures differ because providers define scope differently. As a rough estimate, simple single-site moves are often free or low cost when a host includes them, while multi-site, mixed-stack or Windows migrations are usually priced per server or as a project. The biggest drivers are the number of sites, data volume, database size, email mailboxes, stack complexity and how tight the cut-over window is. Your quote from CloudHouse depends on scope, and we would rather scope it properly than guess a number from a form.
A Sensible Migration Timeline for an Agency
- Days 1 to 3, discovery. Inventory sites, stacks, mailboxes, DNS ownership and traffic patterns.
- Days 3 to 5, build. Prepare the target server and match software versions.
- Days 5 to 8, staged copy and testing. Copy data, test using hosts-file overrides and fix issues.
- Cut-over window. Lower TTL ahead of time, freeze writes where needed, final sync, then switch DNS.
- Following 3 days, monitor. Keep the old server live, watch logs and email delivery, then decommission.
These durations are an illustration. Small estates move faster, and large ones with client-owned DNS take longer.
Red Flags When Choosing a Provider
- A price with no written scope.
- No mention of testing before DNS changes.
- No answer on rollback.
- Requests for permanent root credentials with no plan to revoke them.
- Pressure to commit to a long hosting contract just to get the migration.
- Guarantees of zero downtime for every site regardless of how it is built. Near-zero is realistic for many sites; a promise for all of them is not.
Why Digital Agencies Choose CloudHouse for Server Migration
CloudHouse Technologies provides Linux and Windows server migration for agencies and hosting teams. We work from a written plan, test on the new server before DNS changes and keep the old environment available during the overlap. We can work quietly behind your brand, and we do not tie the migration to a hosting contract, so you stay free to pick any destination provider.
Our support runs around the clock, which matters when a cut-over window falls outside office hours. We do not publish customer names or invented success numbers here; instead, we are happy to walk you through our process and the plan we would use on your estate.
Conclusion
The best server migration company for a digital agency is the one that treats each client site as your reputation, not just a folder to copy. Ask for a written plan, a testing step, a rollback path and clear exclusions, and compare at least two proposals line by line. When you are ready to move client sites without the Friday-night stress, share your server list and get a free, scoped migration quote.
