Construction Site Welfare Requirements UK — What You Must Provide on Site (2026)

Legal Basis for Welfare on Construction Sites

Construction site welfare is not optional. Three pieces of legislation set the legal framework for what you must provide on site in the UK.

• Construction (Design and Management) Regulations 2015 (CDM 2015), Schedule 2 — the primary source of welfare requirements for construction sites. Schedule 2 specifies minimum standards for sanitary conveniences, washing facilities, drinking water, rest facilities, and changing rooms.
• Workplace (Health, Safety and Welfare) Regulations 1992 — apply to all workplaces including construction sites and set broader standards for facilities, temperature, lighting, and cleanliness.
• Health and Safety at Work etc. Act 1974 — the overarching duty of care that underpins all health and safety legislation. Section 2 places a general duty on employers to ensure the health, safety, and welfare of employees so far as reasonably practicable.

Responsibility for welfare provision sits with the Principal Contractor (PC) on any project where more than one contractor is involved. The PC must ensure suitable welfare facilities are in place before the construction phase begins — not during it. If there is no PC (for example, a single contractor working alone for a domestic client), the contractor in control of the site takes on this duty. The client also carries responsibility for ensuring arrangements are in place; on commercial projects a client cannot simply leave welfare provision unaddressed.

Toilets: Minimum Provision Required

Schedule 2 of CDM 2015 sets out the minimum number of sanitary conveniences required on site. The standard benchmark is one WC per 25 workers. However, the rules differ depending on the gender split of your workforce:

• Where the site is male-only: one WC plus one urinal per 25 workers, or one WC per 15 workers if no urinals are provided.
• Where the site is mixed gender: separate facilities must be provided for male and female workers, or facilities with lockable doors that can be used by one person at a time.
• For a workforce of up to 25 people: a minimum of one WC (and one urinal for male-only sites) must be available at all times.

Toilets must be flushing where possible. Where connection to mains drainage is not practicable — as is often the case on greenfield sites or during groundworks — a chemical toilet is acceptable. Portable chemical toilets are widely used on UK construction sites and satisfy the legal requirement provided they are maintained in a clean condition and serviced regularly.

Regardless of type, all toilets must have: adequate lighting (natural or artificial), adequate ventilation, and must be kept clean and in good repair. Toilets should not open directly into a workroom or rest area without an intervening space.

Washing Facilities

Washing facilities must be provided adjacent to — or in the immediate vicinity of — toilets and changing rooms. The minimum requirements under Schedule 2 are:

• Running hot and cold water, or warm water (a single mixed-temperature tap is acceptable).
• Soap or another suitable means of cleaning.
• Towels or other suitable means of drying hands — paper towel dispensers or hand dryers are both acceptable.
• Sufficient washing stations to serve the workforce — the same ratio applies as for toilets (one basin per 25 workers is the generally accepted benchmark).
• Showers where required by the nature of the work — for example, on sites with heavy contamination risk.

Where there is a significant risk of skin contamination — such as on sites involving concrete, cement, tar, or other dermatitic substances — workers must have access to facilities for washing their face, hands, and forearms, not just their hands. This is a specific requirement and is regularly cited in HSE enforcement actions on construction sites. Suitable skin-cleansing products and moisturiser (to protect against dermatitis) should also be provided where appropriate.

Drinking Water

An adequate supply of wholesome drinking water must be available to all workers on site at all times. The requirements are straightforward but must be actively managed:

• The supply must be from a wholesome source — mains connection, bottled water, or an approved dispenser.
• Where there is any risk of confusion between drinking water and non-drinking water supplies (for example, on sites with separate process water feeds), the drinking water supply must be clearly marked with a sign reading "Drinking Water" or similar.
• Cups or other drinking vessels must be provided — workers should not be expected to bring their own.
• Water should be cool where practicable — particularly in warm weather. During heatwaves this becomes a significant welfare concern and the HSE expects site management to take additional steps.
• Drinking water points should be positioned so that workers can access them without excessive travel time from their work area.

Rest Facilities

Suitable rest areas are a legal requirement on construction sites. A rest area must provide shelter from the weather and protection from dust, noise, and fumes generated on site — a partially completed building shell with no heating or furniture does not meet the standard.

• Tables and seating with backs must be provided — workers must be able to sit comfortably to eat and rest.
• Facilities to heat food and boil water must be available — at minimum, a kettle and a microwave satisfy this requirement.
• Rest areas must be kept clean and in good order throughout the project.
• If any workers smoke, a separate designated outdoor smoking area should be provided — workers who do not smoke must not be exposed to cigarette smoke in rest areas.
• If any workers on site are pregnant or nursing mothers, specific suitable rest accommodation must be provided — a general rest room is not sufficient if it is likely to be used by smoking workers or is not private enough to allow rest and breastfeeding.

Changing Rooms and Lockers

Changing rooms are required where workers have to wear special clothing for work (such as PPE, overalls, or other protective gear) and cannot reasonably be expected to travel to and from the site in that clothing. On most construction sites, this threshold is met.

• Separate changing facilities must be provided for male and female workers where both are present on site — or lockable single-occupancy facilities that can be used by either.
• Workers must be able to store their work clothing and personal clothing separately — this matters where work clothing is contaminated with dust, chemicals, or biological agents.
• Secure storage (lockers or equivalent) should be provided for personal belongings — this is a practical requirement rather than a strict legal standard, but failing to provide it generates justified complaints and can attract HSE comment during inspections.
• Facilities to dry wet workwear must be provided — damp clothing left overnight is both a welfare and a hygiene issue. A heated drying room or drying rack in a heated space satisfies this requirement.

On shorter projects, these requirements may be met by a welfare unit that incorporates a changing area — many towed welfare units include a dedicated changing space alongside the toilet and rest area.

Welfare Provision for Small Sites and Short-Duration Work

The HSE recognises that a pragmatic approach is necessary for very short-duration work, particularly in occupied domestic properties. The guidance acknowledges that rigid application of welfare standards to a one-day callout or a two-day kitchen fit would be disproportionate.

For very short-duration domestic work — generally considered to be work lasting less than two or three days — an arrangement with the householder allowing use of their toilet and kitchen facilities is acceptable, provided the householder consents and the facilities are suitable. This is a widely adopted practice and is not discouraged by the HSE where the arrangement is genuine and agreed.

However, for projects lasting longer, contractors must provide their own facilities. Relying on a client's facilities for a two-week refurbishment job is not acceptable under CDM 2015 and leaves both the contractor and, in some cases, the client exposed to enforcement action. The key factors the HSE considers are:

• Duration of the project
• Number of workers on site at any one time
• Whether the client's facilities are genuinely accessible and suitable throughout the working day
• Whether any welfare facilities are nearby (for example, public facilities in a town centre location)

Mobile welfare units — either towed or self-contained — are the standard solution for small to medium sites where permanent installation is not practical.

Welfare Unit Options

The market for mobile and temporary welfare provision is well-developed in the UK. Options range from basic toilet trailers to fully self-contained welfare pods with all required facilities.

• Towed welfare units — the most common solution for small and medium sites. A self-contained trailer incorporating a toilet, washbasin with hot water, rest area with seating, and a gas hob. Typical hire cost is £80–£150 per week including servicing. Requires a towbar-equipped vehicle to move between sites.
• Static portakabin welfare blocks — for longer-duration or larger sites. Full-size modular buildings providing separate toilet, washing, changing, and rest areas to a higher standard than a towed unit. Delivered by crane or HIAB and remain on site for the project duration.
• Container conversions — standard shipping containers fitted out as welfare facilities. More robust than portakabins and suitable for high-security or long-duration sites.
• Toilet trailers — a standalone WC on a trailer, with or without hand-wash facilities. Important note: a toilet trailer alone does not satisfy welfare requirements — you also need rest facilities, washing facilities, and drinking water. A toilet trailer is only a partial solution.

When specifying a welfare unit, verify that it meets Schedule 2 requirements in full — some budget units omit hot water or provide inadequate seating. Check the hire specification carefully before signing a contract.

Welfare on Domestic Projects

Welfare provision on domestic projects is the most contested area of CDM compliance for small contractors. The long-standing practice of using a client's bathroom and kitchen has significant practical justification — and the HSE's own guidance acknowledges it for short-duration work — but many contractors incorrectly extend this arrangement to projects that are clearly too large to qualify.

What the law says: the contractor in control of a domestic site takes on the PC's CDM welfare duties (including Schedule 2) automatically. The domestic client does not bear these duties — the contractor does. There is no exemption from welfare requirements simply because the project is domestic.

What is practical: for a project lasting more than approximately one week in an occupied property, or any project in an unoccupied property, you should be providing your own welfare facilities. A towed welfare unit parked on the driveway or nearby is the standard solution. On longer projects with multiple trades, it is non-negotiable.

Communication with clients matters here. Many homeowners are surprised to learn that their contractor is legally responsible for providing welfare on their project, and some object to a welfare unit being positioned outside their home. Address this in your pre-contract discussion — explain the legal requirement, agree the positioning, and include the welfare provision cost in your quote. Trying to arrange it retrospectively creates friction and sometimes delays the start of work.

HSE Enforcement and the Cost of Getting It Wrong

Inadequate welfare provision is one of the most frequently cited issues during HSE site inspections. Enforcement action is common and can be swift.

• Improvement notices — issued where welfare provision is below the required standard but does not create an immediate risk. You will be given a deadline to comply. Failure to comply by the deadline is a criminal offence.
• Prohibition notices — issued where the welfare situation is so poor that it creates a direct risk to the health of workers. Work must stop until the notice is complied with. A prohibition notice on a welfare issue is relatively rare but does occur — for example, where there are no toilet or washing facilities on a multi-week project with multiple workers.
• Fee for Intervention (FFI) — where the HSE identifies a material breach of health and safety law, the duty holder pays for HSE inspector time at a current rate of £166 per hour. An FFI invoice for a welfare inspection and follow-up can easily reach several hundred pounds for a straightforward case.
• Reputational consequences — HSE enforcement notices are publicly available. Pre-qualification questionnaires (PQQs) for commercial contracts frequently ask about enforcement history. A prohibition or improvement notice on welfare can disqualify you from tendering for commercial work.
• Pre-qualification questions — larger clients, housing associations, and public sector frameworks ask directly about welfare arrangements during tender. Being unable to demonstrate compliant welfare provision will cost you work long before any HSE inspector arrives on site.

The cost of a towed welfare unit is modest relative to the cost of enforcement action, reputational damage, or losing a commercial tender. Factor it into your job costs from the outset.