By nDir 
If you’re transferring staff to the UK under the Global Business Mobility (GBM) route, timing is everything. Get the sequence wrong and you could end up with a Certificate of Sponsorship (CoS) that expires before the visa is even submitted, or a new hire who can’t start on the date the business needs them. Here’s what actually determines how long the process takes, and where the real delays tend to creep in.
The headline processing times
Home Office service standards for Global Business Mobility visa are straightforward on paper:
- 3 weeks for applications made from outside the UK
- 8 weeks for applications made from within the UK (switching or extending)
These are targets rather than guarantees, and actual turnaround can vary with application volume and complexity at the processing centre handling your case. For most straightforward applications with clean documentation, the 3-week standard is being met consistently as of mid-2026.
Faster options, at a cost
If the standard timeline doesn’t work for your start date, the Home Office offers two paid upgrades:
- Priority Service – decision within 5 working days, for an additional £500
- Super Priority Service – decision by the end of the next working day after biometric enrolment, for an additional £1,000
Availability of both isn’t guaranteed and depends on the visa application centre. You’ll be told at the point of application whether priority processing can be added, so it’s worth checking early rather than assuming it’ll be there when you need it.
Example: a business bringing in a Senior or Specialist Worker with a hard start date six weeks out might apply standard and still be comfortable. The same business needing someone in post within two weeks would need Priority Service booked from day one, not added as an afterthought once delays appear.
Processing time doesn’t start when you think it does
This is where most planning errors happen. The clock for standard processing starts from the date biometric information is provided at a visa application centre (for overseas applicants), not from the date the online form is submitted. If biometric appointments are booked out for two weeks in the applicant’s location, that’s two weeks added before the official processing period even begins.
The Certificate of Sponsorship deadline that catches people out
Before any of this can happen, the sponsoring business needs a valid Sponsorship Licence covering the relevant GBM route, and the worker needs an assigned CoS. Once a CoS is assigned, the applicant has three months to submit the visa application. Miss that window and the CoS expires it can’t be extended, reactivated, or transferred. A new one has to be assigned from scratch, effectively restarting the process.
A useful safeguard many advisers recommend: treat the CoS deadline as ten weeks internally rather than the full twelve. That buffer absorbs the everyday friction document gathering, biometric slot availability, or an applicant needing more time to arrange things at their end without risking expiry.
What actually slows applications down
Beyond the standard/priority split, a few practical factors move the needle more than people expect:
- Incomplete documentation. Missing or inconsistent evidence is the single most common cause of delay, and can trigger requests for further information that reset the clock.
- Biometric appointment availability. In some locations, slots are booked weeks in advance.
- Route-specific quirks. Graduate Trainee applicants must apply from outside the UK there’s no in-country option which removes flexibility if plans change late.
- Salary calculation errors. Only guaranteed basic pay and specific allowances count toward the salary threshold; bonuses, overtime, and most in-kind benefits don’t. Getting this wrong at the CoS stage causes problems that surface later in the visa decision.
Building a realistic timeline
For a business planning a transfer under GBM, a workable sequence looks like:
- Confirm the Sponsorship Licence covers the right route (or add it to an existing Skilled Worker licence, which is often quicker than starting fresh)
- Assign the CoS and start the visa clock immediately don’t wait
- Book the biometric appointment as early as possible
- Build in the 3-week (or 8-week, if in-country) standard as the baseline, with Priority Service as a contingency rather than a default plan
None of the five GBM routes lead to settlement, and time spent on GBM doesn’t count toward the qualifying period for Indefinite Leave to Remain. If a long-term move to UK Skilled Worker visa is part of the plan, that switch and its own processing timeline needs to be factored in separately from day one, not treated as a problem for future you.
This article is for general information and does not constitute immigration or legal advice. Processing times and Home Office policy change frequently always check current guidance on GOV.UK or take specific advice before relying on a timeline for business planning.