
What is a Welfare Unit? CDM Requirements and Servicing Explained
A welfare unit is a self-contained facility used to provide temporary welfare facilities on sites where permanent amenities are not available. Welfare units are commonly used on a construction site, roadworks, utilities projects, agricultural locations, event sites, remote sites and other temporary sites.
Welfare units allow workers to access toilets, washing facilities, rest areas, canteen space, drinking water and other basic amenities during the working day. To remain usable, each unit needs suitable servicing, including water supply, wastewater removal and toilet waste emptying.
This guide explains what welfare units are, what CDM 2015 requires and why regular welfare servicing matters.
What Is a Welfare Unit?
A welfare unit is a portable or static unit that provides facilities for workers on sites without suitable permanent provision. Depending on the welfare cabin specification, a unit may include toilet facilities, hand washing, hot water, cold running water, heating, lighting, seating, drying rooms, rest areas and space for meals or hot beverages.
Some welfare units are fitted with toilets, sinks, showers, canteen area facilities, storage space, drying rooms and integrated waste tanks. Others are smaller mobile units designed to provide compact welfare provision where space, access or project duration is limited.
Welfare units may also include features such as solar panels, improved insulation or low-energy lighting, depending on the unit design and hire specification.
Types of Welfare Units
Mobile welfare units
Mobile welfare units are designed for short term projects or sites where the working area may move. Mobile units can usually be relocated more easily than static welfare units, making them suitable for remote sites, roadworks, utilities projects and changing site layouts.
Static welfare units
Static welfare units are generally used on long term sites where the unit can remain in one location for an extended period. Static units may provide larger facilities, greater capacity and more space for workers, offices, storage, rest and welfare provision. Static welfare units can be suitable for construction sites with a larger workforce or longer project duration.
Welfare vans
Welfare vans provide mobile welfare for teams working across multiple locations. These units can be used where workers need access to toilets, seating, heating, hand washing and rest facilities while operating away from a fixed site compound. Welfare vans are often used by utilities teams, highways workers, maintenance teams and industries operating in remote locations.
Whether a site uses welfare vans, static welfare units or mobile welfare units, the facilities still need regular servicing to maintain hygiene and keep operations running smoothly.
What Welfare Facilities Are Required on a Construction Site?
Under the Construction (Design and Management) Regulations 2015, construction sites must provide suitable welfare facilities for workers.
The main welfare facilities required under CDM 2015 include:
- Suitable toilet facilities
- Washing facilities with hot water and cold running water
- Drinking water
- Changing rooms and lockers where required
- Rest facilities
- Facilities for eating meals where required
Toilet facilities should be suitable for the number of workers expected to use them. They should also be kept clean and supplied with toilet paper. Washing facilities should support hygiene, particularly where workers may be exposed to dirt, dust, wastewater or other site materials.
The Workplace (Health, Safety and Welfare) Regulations 1992 apply to many workplaces outside construction, but construction site welfare is mainly addressed through CDM 2015. In all cases, employers and site operators must provide suitable facilities for employees and workers, and those facilities must remain usable throughout the project.
Why Welfare Provision Must Be Planned Early
Welfare provision should not be treated as a final site service. Under CDM 2015, suitable welfare facilities must be available for workers on construction sites. If welfare units are not supplied, connected, filled and serviced in time, workers may be left without suitable toilets, washing facilities, rest space or water supply.
Poor planning can lead to full waste tanks, unusable toilets, a lack of hand washing facilities, hygiene issues, worker complaints and site disruption. It can also create compliance issues where facilities are not suitable, sufficient, accessible or properly maintained for the workforce using them.
For example, a welfare unit may meet the initial hire requirement, but still fail to provide suitable welfare provision if waste tanks are full, water tanks have not been refilled, toilet facilities are unusable or hand washing facilities cannot be used. This can affect site hygiene, worker well being and the site’s ability to meet its welfare obligations throughout the project.
For welfare unit hire, site managers should consider location, access, capacity, workforce size, project duration and servicing frequency before work begins. A welfare cabin may be the perfect solution for temporary welfare provision, but only if the supporting water and wastewater services are arranged correctly.
Tanker services can support this by removing wastewater from welfare units and delivering water for operational welfare uses such as toilet flushing, helping facilities remain usable throughout the project.
How Tanker Services Support Welfare Units
Tanker services such as Universal Tankers can support sites in maintaining safe, clean and operational welfare units.
Water supply
Welfare units may need water for toilets, sinks, showers, hand washing, cleaning and general welfare use. Where water is required for drinking, food preparation or personal hygiene, it must meet the required standards for human consumption and be kept separate from non-potable water used for operational purposes.
Where mains water is unavailable, restricted or not yet connected, Universal Tankers can provide potable water deliveries to support welfare facilities. This can be particularly useful on remote sites, temporary sites and construction projects where infrastructure is still being installed.
Water supply should be planned around the unit specification, workforce numbers, daily usage, storage capacity and refill frequency. This keeps toilets, washing facilities and welfare areas usable throughout the project.
Wastewater
Welfare units can produce several wastewater streams. These may include grey water from sinks, showers and wash areas, black water from toilets, Elsan waste from chemical toilet systems, and fats, oils and grease from canteen or food preparation areas.
This wastewater is usually stored in integrated waste tanks, holding tanks, cesspits or other suitable storage systems before collection. Tank levels should be monitored so emptying can be arranged before capacity is reached.
If tanks are allowed to overfill, welfare facilities can become unusable. Sites may also face odours, contamination risks, hygiene problems and operational delays.
Universal Tankers can arrange scheduled, one-off or emergency wastewater collections from welfare units, so sites can keep facilities operational and wastewater managed through the correct disposal route.
What Is the Welfare Servicing Process?
Universal Tankers provides welfare servicing for sites that need wastewater and toilet waste collected from welfare units and transported through the correct disposal route. This keeps facilities usable, reduces the risk of overflows and supports responsible wastewater management throughout the project.
Before arranging a collection, Universal Tankers will review the practical servicing requirements, including:
- Site location and tanker access
- Welfare unit type and layout
- Tank capacity and current fill levels
- Waste type, including grey water, black water or Elsan waste
- Workforce numbers and usage levels
- Project duration and servicing frequency
Whether scheduled, one-off or emergency emptying is required
Once the servicing requirements have been confirmed, Universal Tankers can arrange a suitable collection using tanker equipment. Wastewater is removed from the welfare unit storage system, transported from site and taken through an appropriate disposal route.
This gives site managers a planned welfare servicing process that reflects site access, usage levels and tank capacity, rather than waiting until facilities become full or unusable.
How Universal Tankers Supports Welfare Unit Servicing
Universal Tankers provides water delivery and wastewater removal services for welfare units across England and Scotland. Our services support construction sites, events, agricultural locations, utilities projects, industrial sites, remote locations and temporary worker accommodation where welfare facilities need to remain operational throughout the project.
With more than 20 years in the industry, Universal Tankers understands the practical requirements involved in welfare unit servicing, including site access, tank capacity, workforce numbers, usage levels and servicing frequency. Our team can arrange water supply and wastewater removal around the way your site operates, whether you need regular scheduled servicing, a one-off collection or emergency support.
Our network of 20 depots across England and Scotland allows us to provide responsive coverage for welfare units in a wide range of locations, including remote and access-restricted sites. Combined with a modern tanker fleet, this allows Universal Tankers to support static welfare units, mobile welfare units, welfare compounds and temporary site accommodation.
Universal Tankers can provide:
- Potable water deliveries for welfare facilities
- Wastewater removal from welfare units
- Toilet waste, grey water, black water and Elsan waste collection
- Cesspit and septic tank emptying where required
- Scheduled, one-off and emergency servicing
- Support for static welfare units, mobile units and welfare compounds
- Next day service anywhere across the country
For construction sites, welfare provision must remain suitable and usable throughout the project. Universal Tankers supports this by keeping water supply, wastewater removal and welfare unit emptying aligned with site access, workforce demand, tank capacity and operational requirements.
Contact Universal Tankers
Contact Universal Tankers to arrange welfare unit water supply, wastewater removal, scheduled servicing or emergency emptying for your site.
Call 0800 180 4474 for England or 01236 444322 for Scotland, or use our online contact form.





