Glossary

48-Hour Working Week Opt-Out Agreement

A voluntary written agreement under Regulation 5 of the Working Time Regulations 1998 permitting an individual worker to work more than the 48-hour statutory average weekly cap.

An Opt-Out Agreement is a voluntary, legally binding written agreement executed under Regulation 5 of the Working Time Regulations 1998 (WTR). It allows an individual worker to agree that the statutory cap of an average 48-hour working week (Regulation 4) will not apply to their employment.

To be legally enforceable before an Employment Tribunal or during an HSE inspection, an opt-out agreement must satisfy strict statutory criteria:

  • Strictly Voluntary: The agreement must be genuinely voluntary. Employers cannot dismiss, discipline, refuse promotion to, or subject a worker to any detriment for refusing to sign an opt-out.
  • In Writing: The agreement must be evidenced in writing and signed by the worker (electronic signatures are acceptable).
  • Separate Agreement: Although frequently presented during onboarding, best legal practice recommends providing the opt-out as a distinct document separate from the main employment contract.
  • Cancellation Rights: The worker retains the statutory right to cancel the opt-out at any time by giving notice. The required notice period is at least 7 days, or a longer agreed period up to a statutory maximum of 3 months.

What Cannot Be Opted Out Of

Signing a Regulation 5 opt-out applies only to the 48-hour weekly maximum. It does not waive:

  • Mandatory daily rest (11 consecutive hours per 24 hours under Regulation 10).
  • Mandatory weekly rest (24 consecutive hours per 7 days or 48 per 14 days under Regulation 11).
  • Mandatory rest breaks (20 minutes for shifts over 6 hours under Regulation 12).
  • Statutory annual leave entitlements (5.6 weeks under Regulations 13 & 13A).
  • Night work limitations for night workers (Regulation 6).

Employer Record-Keeping Duty

Under Regulation 9, employers must maintain up-to-date records of all workers who have signed an opt-out agreement. Digital time tracking platforms help UK businesses track which employees hold active opt-outs and flag excessive hours before health, safety, or burnout risks arise.

Author
PlainStaff Editorial Team
Workforce Management Editorial Team
Updated on
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Related terms

Glossary

Working Time Regulations 1998 (WTR)

The primary statutory instrument in the United Kingdom governing maximum weekly working hours, daily and weekly rest periods, rest breaks, and statutory paid annual leave.

Glossary

Maximum Working Hours

Maximum working hours refer to the statutory cap on working time set by the Working Time Regulations 1998. Adult workers must not exceed an average of 48 hours per week, calculated over a standard 17-week reference period, unless they sign an individual opt-out agreement.

Glossary

Overtime

Overtime refers to hours worked beyond the contractually agreed standard working hours. It must be remunerated or compensated with time off in lieu (TOIL) in accordance with the employment contract and statutory minimum wage requirements.