By the GR.IT Consultancy team | Managed cloud hosting, IT support and cyber security across London and Kent

TL;DR

Cloud migration services in London plan and execute the move of your servers, data and applications from on-premise hardware to hosted cloud infrastructure, with minimal downtime and no data loss. For a typical London SME of 10 to 50 users, a migration takes four to twelve weeks and the project itself is usually a one-off cost in the low thousands, separate from your ongoing monthly hosting. The biggest mistake is treating migration as a lift and shift of everything you own. The businesses that get value from the cloud decide what should move, what should be replaced, and what should stay put, before anyone touches a server.

Most guides to cloud migration are written for enterprises with a dedicated cloud architecture team. This one is written for the London business with a server in a cupboard, a lease break coming up, and hardware that is quietly approaching end of life. It covers what the move actually costs, how long it takes, which model suits you, and the questions that separate a smooth migration from an expensive mess.

What are cloud migration services?

Cloud migration services are the assessment, planning and delivery of moving a business’s data, applications and infrastructure from on-premise servers to cloud hosting, managed end to end by a specialist provider. The service normally covers auditing your current environment, deciding which workloads should move and how, designing the target environment, moving and validating the data, cutting over to live, and supporting the new setup afterwards.

The important part is the word “services”. Cloud platforms are self-serve, and you can technically move your own data. What you are buying from a provider is the judgement about what to move, the sequencing so nothing breaks, and the accountability if something does.

Why are London businesses moving to the cloud in 2026?

Cloud is now the default rather than the ambitious option. The UK government’s Cyber Security Breaches Survey 2025/2026 found that 74% of UK businesses now back up data securely via a cloud service, up from 71% the previous year, making it one of the most widely deployed controls in the country, ahead of two-factor authentication at 47%. Across the EU, Eurostat reports that 49.3% of small enterprises bought cloud services in 2025, up more than seven percentage points in two years.

In London specifically, four pressures tend to force the decision:

• Lease breaks and office moves. Commercial space in the capital turns over fast. Nobody wants to physically relocate a rack, and a move is the natural moment to stop owning servers entirely.
• Hardware reaching end of life. When a five year old server needs replacing, the choice is a capital purchase or a monthly hosting fee. Most finance directors prefer the latter.
• Hybrid teams spread across the city and beyond. Staff working from Croydon, Canary Wharf and the kitchen table need the same performance from the same files.
• Client and insurer security requirements. London firms in professional services, finance and legal are increasingly asked to evidence where data sits and how it is protected, which is far easier to answer with an accredited hosting environment than a cupboard in the office.

Should you move everything to the cloud?

No, and this is where most migrations go wrong. The instinct is to move everything as it stands, which is the fastest way to pay cloud prices for problems you already had.

Before any migration, every workload should be sorted into one of four outcomes. This triage is the single highest-value hour of the whole project.

In practice, a typical SME environment splits roughly across all four. The “retire” column is usually larger than clients expect, and every workload that lands there is a permanent saving rather than a migrated cost.

This is also the difference between a cloud bill that makes sense and one that does not. Flexera’s 2026 State of the Cloud Report found that organisations estimate 29% of their cloud spend is wasted, a figure that ticked up after five straight years of decline. Waste is overwhelmingly decided at migration, not afterwards. Oversized instances and lifted-and-shifted junk are very hard to unpick once they are live and everyone is afraid to touch them.

Public cloud, private cloud or hybrid: which is right for a London SME?

These terms get used loosely. Plainly defined:

• Public cloud means shared infrastructure from a hyperscaler such as Microsoft Azure or AWS, billed on consumption.
• Private cloud means infrastructure dedicated to your business, hosted in a data centre, billed as a predictable monthly fee.
• Hybrid means a deliberate mix of the two, or of cloud and on-premise.

The industry default assumption is that public cloud is the cheaper choice. For a business with steady, predictable workloads, which describes most professional services firms, that is often untrue. Consumption pricing rewards workloads that scale down overnight. A file server and a line-of-business database that run flat, 24 hours a day, do not scale down, so you pay hyperscaler rates for a load that never varies, plus the cost of somebody watching the bill.

That is why GR.IT hosts client workloads on a private cloud platform in UK data centres. Our hosting partner is Cyber Essentials Plus, ISO 9001 and ISO 27001 accredited, and the environment gives you a dedicated infrastructure with the flexibility of the public cloud, on one predictable invoice. You can see how it works on our managed cloud hosting services page.

How long does a cloud migration take?

For a London SME, expect four to twelve weeks from kick-off to cutover, depending on data volume and how many systems are in scope. A rough breakdown:

The variable that moves the number most is not data volume. It is the legacy application. Copying two terabytes of files is a scheduling problem with a known answer. Working out whether a fifteen year old application will run in a new environment, and who supports it if it does not, is where weeks disappear. Any provider who quotes you a timeline before asking what your oldest application is has not scoped the job.

Downtime itself should be minimal. A well-planned cutover for a business of this size happens over a single weekend, with a rollback plan if validation fails on the Sunday.

How much do cloud migration services cost in London?

There are two numbers, and confusing them is the most common budgeting error we see.

1. The migration project. A one-off fee to plan and execute the move. For a typical London SME this is usually a fixed price in the low thousands, scaled by the number of servers and applications in scope and the complexity of the cutover. It is quoted per project rather than from a rate card, because a 12-user file server move and a 60-user multi-application migration are not the same job.

2. The ongoing hosting. A recurring monthly fee for the environment itself, sitting alongside your managed IT support costs. This replaces server hardware, its replacement cycle, and the electricity and space it used.

What drives the project price:

• Number of servers and applications in scope after triage, not before
• Data volume, which affects transfer time more than price
• Legacy or bespoke applications needing compatibility testing
• Cutover approach, where a phased migration costs more than a single weekend but carries less risk
• Security and compliance requirements, such as evidencing data location for clients or insurers
• Whether you need out-of-hours work, which most London businesses do, to avoid touching a working day

The comparison that matters is not migration cost against zero. It is migration cost against the capital cost of replacing the server you are about to replace anyway, plus the cost of the outage you have when it fails first. If your hardware refresh is due within eighteen months, the migration is not an extra spend, it is the alternative to one.

What does a cloud migration project actually involve?

Any provider should be able to walk you through these six stages and tell you which one you are in at any point.

1. Discovery and audit. What you run, what depends on what, and what can be retired. This produces the triage table above.
2. Design. The target environment, sizing, security model, backup and disaster recovery approach.
3. Build and pilot. The environment is created and a small group tests it properly before anyone commits.
4. Data migration. Bulk data moves first, with a final delta sync at cutover so nothing is stale.
5. Cutover and validation. Usually a weekend. Users, permissions, printing and integrations are all verified before Monday, with a documented rollback plan.
6. Optimisation and handover. Sizing is corrected against real usage, documentation is handed over, and support takes it on.

Stage six is where the 29% waste figure gets fixed. Sizing decisions made in the design phase are educated guesses. Reviewing them against four weeks of real usage is what turns a guess into a right-sized bill, and it is the stage most commonly skipped.

Because a migration is a project with a deadline, suppliers and a hard cutover date, it benefits from the same discipline as any other technology change. 

Your cloud migration checklist

Before you sign anything, work through this:

• Audit what you actually run, including the thing in the corner nobody mentions
• Triage every workload into move, replace, leave or retire
• Identify your oldest application and confirm who supports it
• Check your contracts and lease dates, and time the migration to your hardware refresh or lease break
• Confirm where data will physically sit and get the accreditations in writing
• Agree the backup and disaster recovery design, because cloud hosting is not a backup on its own
• Get the rollback plan in writing before cutover weekend
• Agree who supports the environment afterwards and what that costs monthly
• Plan the sizing review for four weeks after go-live

That sixth point catches people out often enough to repeat. Hosting your data in a resilient data centre protects you from hardware failure. It does not protect you from someone deleting the wrong folder, or from ransomware encrypting files that then sync happily to the cloud copy. Backup and cyber security remain separate, deliberate decisions.

What to look for in a cloud migration partner in London

• They ask what to retire before they ask what to move. A provider who starts by sizing your existing kit is selling you your current problems at a monthly rate.
• They will name the data centre. Vague answers about “the UK” are a red flag if your clients ask about data location.
• They quote a fixed price against a defined scope, with a written change process.
• They will still be there on the Monday. The team that migrates you should be the team that supports you, or the handover gap becomes your problem.
• They can evidence accreditations, not just claim them.
• They have moved businesses your size. Enterprise migration experience is not the same skill as moving a 30-person firm over a weekend without anybody noticing.

That fourth point is the one to weigh most heavily. Migration and support are usually sold separately, and the gap between them is where undocumented environments and unanswered questions live.

How GR.IT handles cloud migrations across London

GR.IT Consultancy has supported UK businesses for more than 25 years, from Mermaid House at Puddle Dock in the City of London and our office at the Historic Dockyard in Chatham, Kent. We plan and deliver cloud migrations for London SMEs onto private cloud infrastructure in UK data centres, then keep supporting the environment afterwards as part of managed IT support, so there is no gap between the people who moved you and the people who look after you.

We start with the triage, not the sales quote. Sometimes that conversation ends with a recommendation to move three servers and switch two off, which is a smaller invoice and a better outcome.

Thinking about moving to the cloud this year? Book a free 30-minute IT audit and we will tell you what should move, what should not, and what it would realistically cost.

Frequently asked questions

What is cloud migration?

Cloud migration is the process of moving a business’s data, applications and infrastructure from on-premise servers to cloud hosting. It normally involves auditing the current environment, deciding which workloads should move, designing the target environment, transferring and validating the data, and cutting over to live with minimal downtime.

How long does a cloud migration take for a small business?

For most London SMEs, a cloud migration takes four to twelve weeks from kick-off to cutover. A simple file server move for 5 to 15 users can be done in two to four weeks, while a 50 to 150 user environment with legacy applications can run 8 to 16 weeks. The actual downtime is usually limited to a single weekend.

How much does cloud migration cost in the UK?

Cloud migration has two costs: a one-off project fee to plan and execute the move, typically a fixed price in the low thousands for an SME, and an ongoing monthly hosting fee that replaces your server hardware. The project price depends on the number of servers and applications in scope, legacy application complexity, and whether the cutover is phased or done in a single weekend.

Is private cloud better than public cloud for a small business?

It depends on your workloads. Public cloud consumption pricing rewards workloads that scale up and down. For steady, always-on workloads such as a file server or a line-of-business database, which describes most SMEs, private cloud usually gives better budget predictability and a single fixed monthly fee without needing ongoing cost optimisation.

Do I still need backups if my data is in the cloud?

Yes. Cloud hosting protects you from hardware failure, not from human error or ransomware. Deleted files and encrypted data will replicate to the hosted copy just as readily. Backup and disaster recovery remain a separate design decision and should be agreed as part of the migration.

Should we move everything to the cloud at once?

Rarely. Most successful migrations sort every workload into move, replace, leave or retire first. Lifting and shifting an entire environment as-is is the most common cause of cloud bills that are higher than expected, because you end up paying monthly for systems that should have been retired or replaced with a SaaS equivalent.