Working Time Regulations – Maximum Working Hours, Breaks, and Rest Periods at a Glance

Working time legislation is health and safety protective legislation, not remuneration legislation. It dictates how long and when work may be performed — not how much must be paid for it. Keeping this distinction in mind resolves most common misunderstandings regarding overtime and wage rates immediately.

What Counts as Working Time

Statutory Definition of Working Time (Regulation 2 WTR 1998 / Directive 2003/88/EC)

Working time within the meaning of the law is any period during which a worker is working, at the employer's disposal, and carrying out their activity or duties; working hours across multiple employers must be aggregated.

Two critical aspects are frequently overlooked in practice. First, mandatory setup time, changing time when specialised protective workwear or uniforms are required on-site, and required workplace on-call readiness count towards working time. Second, hours across multiple employment relationships are aggregated — an employee working 35 hours per week in their primary role who takes on a second job can exceed statutory limits much faster than either employer anticipates.

Boundary 1: Maximum Working Hours

The statutory standard under Regulation 4 of the Working Time Regulations 1998 (WTR 1998) establishes a maximum average working week of 48 hours. This limit is calculated over a standard rolling reference period of 17 weeks (which may be extended up to 26 or 52 weeks via a collective or workforce agreement).

An employee may work in excess of 48 hours per week only if they have freely signed a valid, individual written opt-out agreement under Regulation 5 WTR 1998. Workers retain the statutory right to cancel this opt-out at any time by giving written notice of at least seven days (or up to three months if specified in the agreement).

Boundary 2: Rest Breaks

Under Regulation 12 WTR 1998, workers are entitled to an uninterrupted rest break of at least 20 minutes where their daily working time exceeds six hours. Employers may provide longer breaks (such as 30 to 60 minutes) by contract.

Rest breaks must be scheduled during the working shift rather than at the very start or end. Crucially, workers must be permitted to leave their physical workstation and dispose of their time freely — a "break" spent at a desk with an obligation to answer incoming customer calls or monitor systems does not constitute a statutory break.

Workers cannot be required to work more than six consecutive hours without an uninterrupted rest break.

Boundary 3: Daily Rest Periods

Following the end of each working day, workers are entitled to an uninterrupted daily rest period of at least 11 consecutive hours in each 24-hour period (Regulation 10 WTR 1998 / Article 3 Directive 2003/88/EC). Because the eleven hours must be consecutive, any work performed during that window means the rest period only begins once that work ends. Answering work emails at 10:00 PM therefore moves the earliest start time at which the employer can demonstrate compliance to 9:00 AM the following morning.

In specific operational sectors — such as healthcare, hospitality, security, transport, and utilities — compensatory rest arrangements may apply under Regulation 21 WTR 1998 where statutory rest cannot be taken immediately.

In addition to daily rest, Regulation 11 WTR 1998 requires a minimum weekly rest period of:

• An uninterrupted rest period of at least 24 hours in each seven-day period, or
• An uninterrupted rest period of at least 48 hours in each 14-day period.

Boundary 4: Sunday Working and Public Holidays

Under UK employment law, there is no automatic statutory prohibition against working on Sundays or public holidays, nor is there a statutory right to premium pay rates for such work unless specified in the employment contract. However, under Part IV of the Employment Rights Act 1996 (ERA 1996), retail and betting shop workers have specific statutory rights to opt out of Sunday working by giving three months' notice.

Furthermore, under Regulations 13 and 13A WTR 1998, workers are entitled to a statutory minimum of 5.6 weeks' paid annual leave per year (capped at 28 days for a full-time employee working five days a week). Bank and public holidays may be included within this 5.6-week statutory entitlement if agreed in the contract of employment.

The Time Tracking and Record-Keeping Obligation

The ECJ went further in CCOO v Deutsche Bank SAE (Case C-55/18), requiring Member States to oblige employers to operate an objective, reliable and accessible system measuring daily working time. The UK has not enacted that wider duty, so Regulation 9 remains the operative requirement — but the CCOO standard is the one UK employers are advised to work to, since objective records are what actually discharge the evidential burden in a tribunal or an HMRC inspection.

Variations via Collective and Workforce Agreements

Regulation 23 of the Working Time Regulations 1998 allows employers and recognised trade unions (or elected workforce representatives via formal workforce agreements under Schedule 1 WTR 1998) to agree variations or derogations. These include modifying the reference period for the 48-hour week up to 52 weeks or altering specific daily and in-work rest break schedules, provided equivalent compensatory rest is afforded. Individual contracts cannot derogate from statutory floors without an approved collective or workforce agreement structure.

Who Is Exempt from the Scope of the Regulations

Under Regulation 18 and Regulation 20 WTR 1998, specific exemptions apply to workers with unmeasured working time where the duration of working time is not measured or predetermined, or can be determined by the worker themselves — such as managing executives with genuine autonomous decision-making power, family workers, or ministers of religion. Young workers (above compulsory school age but under 18) are subject to stricter protections spread across Regulations 5A, 6A, 10(2), 11(3) and 12(4) of the WTR 1998 — a maximum eight-hour day and 40-hour week, with no individual opt-out permitted.

In HR practice, executive exemptions are frequently misapplied: what is decisive is not an impressive job title in an employment contract, but whether the worker genuinely exercises autonomous control over their working time and schedule.

Sources and Legal References

Statutes and Statutory Instruments

• Working Time Regulations 1998 (SI 1998/1833) Reg 2 — Interpretation and statutory definition of working time
• Working Time Regulations 1998 Reg 4 & 5 — Maximum weekly working time of 48 hours and individual opt-out agreements
• Working Time Regulations 1998 Reg 10 & 11 — Daily rest (11 hours) and weekly rest (24 or 48 hours)
• Working Time Regulations 1998 Reg 12 — Rest breaks of at least 20 minutes for working days exceeding six hours
• Working Time Regulations 1998 Reg 9 — Employer obligations to maintain adequate working time compliance records
• Working Time Regulations 1998 Reg 13 & 13A — Statutory entitlement to 5.6 weeks of paid annual leave
• Employment Rights Act 1996 (ERA 1996) Part IV — Sunday working rights and protections for retail and betting workers
• National Minimum Wage Act 1998 — Statutory time and pay record retention obligations (six-year requirement)

Case Law & Judicial Precedents

• European Court of Justice (ECJ), Judgment of 14 May 2019 – Case C-55/18 (CCOO v Deutsche Bank SAE) — Requirement to set up an objective, reliable, and accessible system enabling the duration of daily working time to be measured
• Employment Appeal Tribunal (EAT) – Grange v Abellio London Ltd [2016] UKEAT/0130/16/DM — Employer duties to afford and facilitate the actual taking of statutory rest breaks

Evaluation status: August 2026. This article provides general regulatory guidance and does not constitute formal legal advice for individual cases. Consult a qualified employment law solicitor or ACAS for specific employment disputes.