Portable Toilet Block Hire: When You Need More Than One Unit

When One Unit Is Not Enough: A Guide to Portable Toilet Block Hire

A single portable toilet solves the problem for a small building project or a domestic emergency. But as soon as the numbers increase — more workers, more event attendees, more daily users — you need more capacity. That is where toilet blocks come in.

This guide covers what portable toilet blocks are, when to use them, how they compare with rows of individual units, and the practical considerations for hiring them.

What Is a Portable Toilet Block?

A portable toilet block is a multi-cubicle toilet facility contained within a single unit. Rather than a row of individual portable toilets standing side by side, a toilet block provides multiple cubicles within one structure — typically two to six cubicles, depending on the model and specification.

Toilet blocks come in several configurations:

Basic toilet blocks

Multiple standard cubicles in a single enclosure. Each cubicle has a toilet, toilet paper, and hand sanitiser. The waste holding tank is shared. Basic blocks are self-contained — no mains water or power required.

Mains-connected toilet blocks

Multiple cubicles with flushing toilets, running water handwash basins, and electric lighting. These require a mains water supply (or a bowser), mains electricity (or a generator), and either mains drainage or a waste holding tank.

Welfare units with integrated toilets

Container-based welfare units that include toilet cubicles alongside other facilities — a drying room, a canteen area, a rest area. Common on construction sites where comprehensive welfare provision is required.

When to Choose a Toilet Block Over Individual Units

Construction sites with larger workforces

The Construction (Design and Management) Regulations 2015 require adequate welfare facilities for all workers on site. The standard ratio is one toilet per seven workers. For a site with twenty-one workers, you need three toilets. A three-cubicle toilet block provides this in a single unit rather than three individual units.

Advantages on construction sites:

• Smaller footprint — one unit takes less space than three individual units
• Easier to position — one delivery, one placement, one access route for servicing
• More robust — block construction withstands site conditions better than individual units
• Integrated handwashing is often included

Events with space constraints

At events where ground space is limited — urban events, car park events, village green events — a toilet block provides more capacity in less space. A six-cubicle toilet block occupies roughly the same ground area as four individual units but provides six usable toilets.

Events requiring a tidier appearance

A toilet block has a neater, more organised appearance than a row of individual units. For events where aesthetics matter — corporate functions, weddings with marquees, upmarket food festivals — a toilet block presents better.

Sites requiring long-term provision

For sites that need toilet facilities for months or years — depot yards, agricultural compounds, seasonal venues — toilet blocks offer a more permanent-feeling solution than individual portable toilets. They withstand long-term use better and can be connected to site services for a more comfortable experience.

How Many Cubicles Do You Need?

Construction sites

• 1 to 7 workers: 1 cubicle (a single portable toilet is sufficient)
• 8 to 20 workers: 2 to 3 cubicles (a small toilet block or two individual units)
• 21 to 50 workers: 3 to 7 cubicles (a toilet block is more practical than multiple individual units)
• 50+ workers: Multiple toilet blocks or a combination of blocks and individual units

Events

Use the standard event ratios to calculate total cubicles required:

• 1 per 100 female attendees
• 1 per 150 male attendees (or urinals for male provision)
• Plus accessible units
• Plus adjustments for alcohol, duration, and event type

Whether to provide this capacity through individual units, toilet blocks, or a combination depends on your site layout, budget, and aesthetic preferences.

Practical Considerations

Delivery and positioning

Toilet blocks are larger and heavier than individual portable toilets. They require a larger delivery vehicle (typically a lorry with a crane or a flatbed with a Hiab) and more ground preparation.

Before booking, confirm:

• Vehicle access route to the placement area is wide and strong enough
• The ground at the placement point is firm, level, and capable of supporting the weight
• There is sufficient clearance above and around the unit for delivery
• The ground will remain accessible for servicing vehicles throughout the hire

Services

Basic toilet blocks are self-contained — like oversized individual units. But mains-connected blocks need:

• Water supply: Either a mains connection or a bowser (water tank) that requires periodic refilling
• Electricity: Either a mains connection or a generator, which needs fuel and creates noise
• Drainage: Either a mains drain connection or a waste holding tank that requires regular emptying

Discuss service requirements with your hire company. They will advise on what your site can support and what additional equipment is needed.

Servicing frequency

Toilet blocks are serviced in the same way as individual units — waste tanks emptied, interiors cleaned, consumables restocked, chemicals recharged. The frequency depends on usage:

• Construction sites: weekly for standard use, twice weekly for heavy use
• Events: daily for multi-day events, potentially mid-event for single-day events
• Long-term sites: weekly as standard

Because toilet blocks have shared waste tanks, the tank capacity may be larger than an individual unit — but it is also shared across more cubicles. The net effect on servicing frequency depends on the specific unit and usage level.

Cost comparison

Toilet blocks generally cost more per cubicle than individual units, but the total cost for a given capacity may be comparable or lower when you factor in:

• Fewer deliveries (one block vs multiple individual units)
• Less ground preparation
• Easier servicing (one location rather than multiple)
• Reduced site management time

For larger requirements — ten or more cubicles — get quotes for both options and compare the total cost including delivery, servicing, and collection.

Accessibility

Standard toilet blocks do not typically include accessible cubicles. Accessible provision is usually supplied as a separate accessible portable toilet unit alongside the toilet block. Ensure your site plan includes an accessible unit in addition to any toilet block provision.

Winter use

Mains-connected toilet blocks with heating and insulation perform well in winter. Self-contained toilet blocks without heating are subject to the same cold-weather challenges as individual units — frozen tanks, cold interiors, uncomfortable use.

If your toilet block will be in use during winter months, discuss frost protection and heating options with your hire company.

Combining Blocks and Individual Units

For many events and larger sites, the best solution is a combination:

• A toilet block at the main location providing high-capacity provision
• Individual portable toilets at secondary locations around the site
• Accessible units positioned at the most accessible locations
• Urinals at high-traffic points (events with bars)

This approach provides capacity where it is most needed while ensuring coverage across the entire site.

Making the Decision

Choose individual portable toilets when:

• You need one to four units
• The site is compact and access is straightforward
• Budget is the primary concern
• The hire is short-term
• Self-contained operation (no services) is important

Choose a toilet block when:

• You need five or more cubicles
• Space is limited and a smaller footprint matters
• A tidier appearance is important
• The hire is longer-term
• Site services (water, power, drainage) are available or can be arranged

Talk to Us

If you are unsure whether individual units or a toilet block is the right choice for your site or event, give us a call. We will discuss your requirements, visit the site if needed, and recommend the most practical and cost-effective solution. We would rather you hire the right product first time than switch partway through.