A leave extension request is trickier than the original request — you are asking to change terms that were already agreed. The key is giving your manager enough time to adjust coverage, being honest about why you need more time, and showing you have considered the impact on your team. The templates below handle every scenario, from extending a holiday to requesting additional medical leave.

Key Takeaways

  • A leave extension email should include the new return date, the reason for the extension, and a revised handover plan for the additional days.
  • Send the request as early as possible — the more notice you give, the more likely your manager can accommodate it without operational disruption.
  • UK employees on annual leave have no automatic right to extend — the employer must agree. Statutory sick pay covers illness during leave if you are genuinely unwell.
  • US employees on FMLA leave can extend within the 12-week entitlement, but exceeding it may not be protected.
  • Australian employees on long service leave should check their state’s specific rules — some states require employer agreement for partial recall.
  • Be specific about dates — “a few more days” is harder to approve than “until Friday, [Date].”

Template 1: Extending Annual Leave (Personal Reason)

Use this when you need more holiday days for personal reasons — a trip running long, a family event, or rest.

Subject: Leave Extension Request — [Your Name]

Hi [Manager],

I'd like to request an extension to my current leave. My approved leave runs until [Original Return Date], and I'd like to extend it to [New Return Date] ([X] additional working days).

The reason is [brief reason — e.g., a family commitment / travel disruption]. I understand this is short notice and I'm happy to discuss alternatives if the timing doesn't work.

[Colleague] has agreed to cover [responsibility] for the additional days. I'll make sure any pending tasks are handed over before my original return date.

Thanks,
[Your Name]

Template 2: Extending Sick Leave (Medical)

When you are still unwell and cannot return on the expected date. Your employer may require a fit note (UK) or medical documentation.

Subject: Sick Leave Extension — [Your Name]

Hi [Manager],

I'm writing to let you know that I'm still unwell and will not be able to return on [Original Return Date] as expected. My doctor has advised I take until [New Return Date] to recover.

I've attached a fit note covering the extended period. I understand this affects the team's coverage and I'm sorry for the inconvenience.

[Colleague] is aware of the handover. I'll update you on [Date] about my expected return.

Thanks,
[Your Name]

In the UK, employers can require a fit note from day 8 of sickness absence. If you are on annual leave and become ill, you can convert those days to sick leave — you do not need to use annual leave for illness.

Template 3: Extending Maternity / Paternity Leave

Extending parental leave is more formal and may have legal implications. Check your employer’s policy and statutory entitlement before sending.

Subject: Parental Leave Extension — [Your Name]

Hi [Manager / HR],

I'm writing to request an extension to my [maternity/paternity/parental] leave. My current leave is approved until [Original Return Date], and I'd like to extend it to [New Return Date].

The reason for the extension is [brief reason — e.g., my child's medical needs / ongoing parental responsibilities]. I've reviewed my statutory entitlement and [believe I have X weeks remaining / understand this may be unpaid].

I've prepared a revised handover for the extended period and would like to discuss any implications for my role or benefits.

Please let me know the next steps.

Thanks,
[Your Name]

Template 4: Extending FMLA Leave (US)

US employees on FMLA leave can extend within the 12-week entitlement. If the original leave was designated as FMLA, the extension may be protected — but you must follow your employer’s procedure.

Subject: FMLA Leave Extension — [Your Name]

Hi [Manager / HR],

I'm writing to request an extension of my FMLA leave. My current leave was approved from [Start Date] to [Original Return Date], and I need to extend to [New Return Date].

My healthcare provider has confirmed that the additional time is medically necessary. I've attached updated certification.

I understand this extends my total FMLA usage to [X] weeks of the 12-week entitlement. Please let me know if there are additional forms required.

Thanks,
[Your Name]

Template 5: Extending Long Service Leave (Australia)

Long service leave rules vary by state. Some states require employer agreement for early recall or partial leave. Check your state’s long service leave act before requesting an extension.

Subject: Long Service Leave Extension — [Your Name]

Hi [Manager],

I'm writing to request an extension to my long service leave. My current leave runs until [Original Return Date], and I'd like to extend it to [New Return Date] ([X] additional weeks).

I understand that long service leave extensions may require [manager approval / HR review] under [state] long service leave legislation. I'm happy to discuss any implications for my entitlements.

[Colleague] is covering my responsibilities for the additional period.

Thanks,
[Your Name]

Template 6: Extending Sabbatical Leave

Sabbaticals are typically pre-approved with fixed dates. Extending one requires a strong case and early communication.

Subject: Sabbatical Leave Extension — [Your Name]

Hi [Manager],

I'd like to request an extension to my sabbatical leave. My current sabbatical was approved until [Original Return Date], and I'd like to extend it to [New Return Date] ([X] additional weeks/months).

The reason is [brief reason — e.g., the research project I'm undertaking has reached a critical phase / I have a personal commitment that requires additional time]. I understand this is beyond the original agreement and I'm happy to discuss any conditions for the extension.

I've ensured [Colleague] has full coverage of my responsibilities and will be available for critical questions during the extension.

Thanks,
[Your Name]

When to Request a Leave Extension

Situation When to Request Likelihood of Approval
Holiday running long At least 5 days before original return Moderate — depends on staffing
Still unwell (sick leave) As soon as you know you cannot return High — employers generally accommodate genuine illness
Family emergency extended As soon as you know the situation High — dependant leave rights protect you in UK/AU
Sabbatical extension At least 4 weeks before original return Low — sabbaticals are pre-negotiated
FMLA extension Within the original 12-week window High if entitlement remains
Long service leave (AU) Depends on state legislation Check state-specific rules

What to Include in a Leave Extension Email

Include Skip
New return date (specific) Vague language (“a few more days”)
Reason for the extension Excessive detail about your situation
Revised handover plan Apologies beyond one sentence
Acknowledgement of the impact on team Assumption that the extension is automatic
Offer to discuss alternatives Threats or ultimatums

Frequently Asked Questions

Can my employer refuse a leave extension?

Yes. Annual leave extensions are at the employer’s discretion — they can refuse for operational reasons. However, if the extension is due to illness, most employers are legally required to accommodate genuine sick leave. In the UK, converting annual leave to sick leave is a statutory right.

Will extending my leave affect my pay?

It depends on the type of leave. Extending annual leave uses more of your paid entitlement. Extending sick leave may switch from paid annual leave to unpaid sick leave (if your sick leave entitlement is exhausted). Extending FMLA leave in the US is unpaid but job-protected.

Can I extend my leave while on it?

Yes, but request it as early as possible. Waiting until the last day of your leave to request an extension puts unnecessary pressure on your manager and may result in a refusal.

Does extending leave affect my accrued benefits?

Extending unpaid leave may affect holiday accrual, pension contributions, or other benefits that depend on active employment. Check your employment contract or ask HR before requesting an extension.

What if I need to extend my leave indefinitely?

If you cannot predict a return date, discuss a formal leave of absence with your HR department. Extended leave without a fixed return date is treated differently from a short extension and may require medical documentation, board approval, or a formal leave of absence process.

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