Understanding Mobile Workers' Working Time Regulations: What UK Businesses Need to Know

Mobile working is fast becoming the norm for many UK businesses. From delivery drivers and sales reps on the road, to support engineers and consultants visiting clients, the modern workforce is regularly on the move. But what does this mean for employers when it comes to meeting legal obligations-especially around working hours, rest breaks, and employee wellbeing?

If your business has a growing mobile workforce, understanding your responsibilities under the Working Time Regulations (WTR) is crucial. Get it right, and you’ll keep your people happy, productive, and safe (while avoiding expensive legal headaches). If you’re feeling a bit lost on what counts as “working time”, rest break rules, or how to track hours across shifting locations-don’t stress. This guide breaks down everything UK businesses need to know about mobile workers’ working time regulations, practical compliance tips, and where you can turn for extra legal support.

What Does “Mobile Workers” Mean and Why Do Working Time Regulations Matter?

Let’s start with the basics. A mobile worker is anyone whose work requires them to be on the move-commuting between sites, clients, or working locations-rather than in a fixed office or single workplace. Think:

• Delivery drivers and couriers
• Sales reps and field technicians
• Healthcare staff visiting patients
• Installers, engineers, or tradespeople moving between jobs

Chances are, if your team members spend much of their working day travelling from place to place to complete their duties, they’re classed as mobile workers-and that means the Working Time Regulations 1998 (WTR) apply to them, just as they do to office-based staff. But there are a few essential differences and pitfalls to be aware of.

WTRs are the core set of rules that govern how many hours employees can work, how much rest they're entitled to, annual leave entitlements, night work, and more. For mobile workers, some of these rules are more complicated-especially when defining what counts as working time and how to monitor compliance.

Which Working Time Regulations Apply to Mobile Workers?

The main areas of Working Time Regulations that apply to mobile workers include:

• Maximum weekly working time
• Daily and weekly rest breaks
• Night work restrictions
• Paid annual leave

Let’s break down what each means for your business.

How Is “Working Time” Defined for Mobile Workers?

One of the biggest challenges for employers with mobile staff is understanding what legally counts as “working time”. For most employees, it’s simple: their contracted hours in the office or onsite.

But for mobile workers, working time includes:

• Any period they are at their employer’s disposal, carrying out their activities or duties
• Travelling between job sites (except between home and their first work appointment, and their last work appointment and home, unless the European Court of Justice ruling applies - more on that below!)
• Any time spent waiting for assignments or instructions while on the move
• Time spent on necessary work-related training

A pivotal 2015 European Court of Justice decision (the Tyco case) confirmed that, for mobile workers who do not have a fixed or habitual workplace, travel between home and their first and last customer of the day must count as working time. This is a crucial detail for employers scheduling mobile teams-it can significantly impact daily and weekly hour totals.

What Are the Maximum Working Hours for Mobile Workers?

Under the WTR, mobile workers are generally subject to the same working hour limits as other staff:

• 48-hour maximum average working week: This is averaged over a 17-week reference period, though workers can opt out in writing if they wish to work more.

For most roles, this covers all time spent working (including travel that counts as working time), overtime, and certain types of job-related waiting or training.

If your business engages mobile workers regularly, it’s important to have transparent systems in place to record hours, including travel and any on-call time. Failing to keep accurate records can make you vulnerable if there’s a dispute or an investigation by regulators.

Need help with this? Our detailed guide to Working Time Regulations explains how reference periods and opt-outs work in the UK.

Rest Breaks and Daily/Weekly Rest Requirements for Mobile Workers

The WTRs provide for minimum rest during and between shifts. For mobile workers, employers still need to ensure that:

• There’s a minimum 20-minute uninterrupted rest break on any working day over 6 hours long
• There’s 11 consecutive hours’ rest in each 24-hour period
• Mobile workers receive at least one 24-hour rest period every week, or 48 hours every fortnight

Some sectors (like road transport or aviation) have separate regulations that modify or add to these rules, but most mobile workers will be covered by standard WTR requirements. If you’re unsure, it’s wise to get legal advice tailored to your particular sector.

How Do You Calculate Working Time for Mobile Employees?

This is where employers of mobile staff can get tripped up. Recording working hours for remote or field staff isn’t as easy as using an office clock-in system. Yet, under the WTR, you’re required to keep “adequate records” to show compliance with working time limits and rest periods.

To get this right, you should:

• Track travel time between jobs, especially where there’s no fixed workplace
• Record when the worker starts and ends their day (including time traveling from home to first job and last job to home, where it counts as working time)
• Include any periods of waiting, training, or on-call duties away from the fixed site

Modern workforce management apps, driver logs, and even simple timesheet solutions can help-but be proactive about keeping and reviewing records. Inconsistent tracking is a common source of disputes and potential breach of regulations.

Consider a policy that clearly spells out how working hours are counted for your mobile team. Our guide to employee handbooks explains how to document and communicate key legal policies (like working time) so everyone is on the same page.

Special Rules: What About Night Work, On-Call Time, or Irregular Hours?

Some mobile roles naturally include night driving, emergency call-outs, or unpredictable shifts. Extra working time rules apply if your mobile staff:

• Work night shifts (at least three hours during the period 11pm-6am, or your chosen “night period”)
• Have on-call time that is spent travelling or waiting to be assigned a job (this often counts as working time if the employee can’t use the time freely for their own purposes)
• Work irregular or fragmented schedules (e.g. alternating between early, late, and overnight shifts)

Night workers are entitled to:

• A limit of an average 8 hours’ work per 24 hours (typically calculated over a 17-week period)
• Free health assessments

For on-call time, whether it counts as working time depends on whether your mobile workers are required to remain at a location dictated by the employer, or if they have to remain available to start work at short notice. If they can use the time freely, it may not count - but if they’re actively working or responsible for responding, it likely does.

Confused? Our guide to working time rules covers these scenarios in detail and helps you work out where your legal obligations sit.

Do Travel and Waiting Time Count as Working Time?

Travel time and time spent “waiting” for work assignments are key sticking points for businesses relying on mobile workers. Here’s the bottom line:

• Travel between job sites/work locations: This is almost always counted as working time under the WTR.
• Travel from home to first assignment and last assignment to home: For mobile workers with no fixed base (thanks to the Tyco ruling), this time typically counts as “working time”.
• Waiting between assignments: If the worker needs to be available and ready to work (i.e., not free to do as they please), this counts as working time.

But: standard commutes to and from a fixed workplace (i.e., from home to one regular work address) generally do not count as working time.

Do You Need Different Policies or Contracts for Mobile Staff?

It’s smart to have tailored contracts and policies for staff who are classed as mobile workers. Not only does this help clarify hours, travel policies, and expenses, it also ensures the employee understands their rights and obligations under the unique circumstances of mobile working.

Shopping around for professional contracts and policies? Our employee management guide breaks down the key documents and procedures you might need, including:

• Employee handbooks covering mobile working and travel time policies
• Employment contracts with clauses for working time, travel, overtime, and rest
• Clear guidelines for tracking and reporting working hours

Avoid generic templates-tailored legal documentation means you’ll be protected from day one, with smooth compliance if an issue ever arises.

Annual Leave and Mobile Workers: What Are You Required to Provide?

All workers covered by the WTR, including mobile staff, are entitled to a minimum of 5.6 weeks’ paid annual leave per year (pro-rata for part-time employees). The calculation of holiday pay for mobile workers must factor in regularly worked overtime and travel that counts as working time.

If you need help with calculating holiday entitlement for mobile workers, Sprintlaw has a practical guide to keep you compliant.

Penalties for Non-Compliance: What Happens If You Get It Wrong?

Ignoring mobile workers’ working time regulations might feel tempting if you’re under pressure to get jobs done, but non-compliance can have serious consequences, including:

• Employment Tribunal claims from workers who have been overworked or denied rest breaks
• Poor staff retention and costly disputes over pay or records
• Regulatory action and fines (especially in safety-critical sectors like transport and logistics)
• Risks to health and safety, which can lead to more serious legal action if fatigue causes accidents or near misses

Failure to follow WTR provisions is triable at Employment Tribunal and can also affect your business’s reputation and ability to attract quality workers. Prioritising compliance is always the best strategy in the long run.

What Other Laws or Considerations Apply to Mobile Working?

As well as the WTR, you should be aware of other employment and health and safety laws that apply to mobile working:

• UK Employment Laws, including the Employment Rights Act 1996
• The Health and Safety at Work etc. Act 1974, ensuring safe working conditions in all locations (including company vehicles and customer sites)
• GDPR and data protection, particularly if mobile workers access or handle client data on the move
• Specific sectoral regulations for commercial driving, aviation, railway, or offshore workers

Sector-specific rules may override general WTR provisions in certain cases-always consult a legal expert if you’re unsure which laws apply to your workforce.

Key Takeaways

• Mobile workers (staff without a fixed base who travel for work) are protected by the Working Time Regulations, covering working hours, rest, and holidays.
• Travel time between job sites-and in many cases from home to the first job and last job to home-will count as working time for mobile staff.
• Employers must record working hours accurately, including travel and waiting periods, to show compliance with WTR obligations.
• Mobile workers are entitled to minimum rest breaks, daily and weekly rest, limits on night work, and paid annual leave on the same terms as other staff (with appropriate calculations for their working patterns).
• Having tailored policies, employment contracts, and record keeping systems in place reduces legal risk and ensures you remain compliant as your mobile workforce grows.
• Failing to comply with WTR can result in claims, fines, reputational damage, and increased risk of workplace accidents.
• Sector-specific rules or additional laws may affect your obligations-seek tailored legal advice if you’re in a regulated industry or have questions about complex working patterns.

If you’d like expert help reviewing your contracts, putting the right workplace policies in place, or just want to make sure you’re compliant with mobile workers’ working time regulations, you can reach us at team@sprintlaw.co.uk or call 08081347754 for a free, no-obligations chat.