Slips, Trips and Falls: Prevention Guide for Construction Sites

Ask an HSE inspector what hurts most construction workers and the answer won't be power tools. HSE guidance has said for years that trips are the most common cause of reported injuries on construction sites, and HSE's own figures put several thousand construction workers a year on the injured list after a slip or trip on a building site. People go over on the flat, on a trailing lead, an off-cut or a patch of mud, and land badly enough to lose weeks of work.

This guide deals with same-level slips, trips and falls: the ones that happen on the ground you're standing on. Falls from height are a different regime under the Work at Height Regulations 2005, and we cover them separately in our working at height guide. Here we'll stick to what's underfoot.

What Counts as a Slip, Trip or Fall on Site

A slip is a loss of grip between your boot and the surface: wet concrete, mud, ice, smooth sheet materials. A trip is your foot hitting something and stopping while you keep going: a cable, a brick, an unexpected step. The fall is what happens next, and on the flat it usually means wrists, knees, heads and fractures.

The boundary matters because the controls differ. A trip across a level walkway is a housekeeping problem. A trip at an unprotected edge or opening that sends someone down a storey is a fall from height, governed by the Work at Height Regulations 2005, and the fix is edge protection and covers, not a broom. Plenty of real incidents sit right on that line, so decide early which one you're dealing with.

Why Slips and Trips Top the Injury Stats

The numbers are worth knowing because the causes are so ordinary. HSE says several thousand construction workers are injured each year following a trip or slip at work on a building site, and around 1000 of those injuries involve fractured bones or dislocated joints. HSE also says most of these injuries could be avoided by managing working areas and access routes such as stairwells, corridors, footpaths and site cabins.

Plenty of these end up as reportable injuries. Under RIDDOR, a fracture other than to fingers, thumbs or toes is a specified injury and must be reported. So is any work-related injury that keeps someone off normal duties for more than seven consecutive days, not counting the day of the accident but counting weekends and rest days, and that report is due within 15 days. We walk through the whole process in our RIDDOR reporting requirements guide.

Where the Legal Duty Comes From

So is housekeeping a legal duty, or just something inspectors nag about? It's a legal duty, and it has a regulation number.

The Health and Safety at Work etc. Act 1974 is the umbrella. Section 2 puts a duty on employers to protect the health, safety and welfare of their employees, so far as is reasonably practicable, including keeping places of work in a safe condition and providing safe access and egress. Section 7 works the other way: every employee must take reasonable care of themselves and anyone else affected by what they do, and co-operate on safety. That's the legal hook behind "see it, sort it".

The Management of Health and Safety at Work Regulations 1999 make the assessment duty explicit. Regulation 3 requires a suitable and sufficient assessment of risks to your workers and to anyone else your work affects, including other trades, clients and the public. Regulation 5 requires arrangements for planning, organising, controlling, monitoring and reviewing your protective measures. Employ five or more people and the assessment and those arrangements must be written down.

CDM 2015 then gets construction-specific. Regulation 15 says contractors must plan, manage and monitor their own work. Regulation 16 decides who the Part 4 duties land on: whoever controls the relevant work. On a small job, that's you. Even a domestic client who controls how the work is done holds part of the duty.

• Regulation 17, safe places: suitable and sufficient safe access to and egress from every place of work, plus enough working space
• Regulation 18, good order: each part of the site kept in good order, work areas kept in a reasonable state of cleanliness, and no timber or material with projecting nails left where the nails could hurt someone
• Regulation 27, traffic routes: the site organised so pedestrians and vehicles can move without risks, with sufficient separation or other protection, and routes signed where needed, checked and properly maintained
• Regulation 35, lighting: suitable and sufficient lighting on the site, approaches and traffic routes, natural light so far as is reasonably practicable, and secondary lighting where losing the primary artificial light would create a risk

So when someone tells you good housekeeping is just a nag, point them at regulation 18. Keeping the site in good order isn't goodwill, it's the law, and it's the regulation an inspector will reach for when the site's a tip.

The Hazards to Walk Your Site For

The best way to build your control list is to walk a real site in the order you meet the problems. Here's that walk, hazard by hazard, with what actually works on a small, wet, fast-moving job.

Housekeeping and Waste

HSE says many of these injuries happen simply because something, usually building materials or waste, is in the person's way. So the control is dull but effective: decide where waste goes before the job starts. Position skips, agree who's responsible for emptying bins, and plan deliveries so you're not storing three weeks of materials on a job that needs two days of them.

Clear as you go rather than at the end. Packaging and timber off-cuts are fire load too, so shifting them daily pays twice. Inside buildings, plan bins or chutes so waste has somewhere to go that isn't the stairwell.

Cables, Hoses and Trailing Leads

Trailing leads are the classic construction trip because everything needs power and nothing stays put. HSE's advice is simple and it works: use cordless tools wherever you can, and where you need mains power or temporary lighting, run the cables at high level, especially along corridors.

Where a cable has to cross a walkway, ramp it or route it overhead. Same for hoses. Put the cable run in the method statement rather than leaving it to whoever plugs in last.

The Trailing Cable Myth: There Is No Magic Number

You'll hear someone on site quote a maximum legal cable length, often 26 metres. There is no such rule. No regulation sets a distance for trailing cables, hoses or leads, and there's no fixed legal number of steps either. What the law requires is that people can move around safely, so each cable run is judged on whether it creates a risk and whether you've controlled it. Treat the 26 metres line as a myth, not a method.

Walkways, Storage and Access Routes

HSE wants walkways that are clearly designated, in good condition underfoot, signposted and adequately lit. On a muddy site that usually means a defined route of scaffold boards rather than the line people happen to walk. Don't let storage spread onto footpaths, and never store materials where they block an escape route.

Keep pedestrians and vehicles apart. Regulation 27 wants the site organised so both can move without risk, with sufficient separation or, where that isn't possible, other protection and warning. On a small domestic site that might just mean agreeing the delivery window and keeping the unloading zone out of the walkway, but agree it and write it down.

Wet Weather, Mud and Ice

Rain, mud and ice turn every route into a slip hazard. HSE's advice: treat muddy surfaces with stone, icy surfaces with grit, or provide temporary covering, and signpost areas that stay slippery. Manage mud at the gate with a scraper and a board to stand on, so it doesn't get walked through the house.

Deal with spills straight away, cement slurry and cutting water included. CDM 2015 regulation 34 also expects outdoor sites to be arranged, so far as is reasonably practicable, to protect workers from adverse weather. In practice that means thinking about drainage, covers and where the water will go before the week of rain arrives, not during it.

Lighting and Temporary Lighting

You can't avoid a hazard you can't see. Regulation 35 requires suitable and sufficient lighting on the site, its approaches and traffic routes, natural light so far as is reasonably practicable, and secondary lighting where a failure of the primary artificial light would create a risk, such as in stairwells and basements. In December, walk your internal routes at the end of the shift and see what the last hour of the day actually looks like.

Changes in Level, Openings and Edge Protection

Small changes in level, at doorways for instance, catch people all day. HSE suggests installing ramps where the change can't be avoided, and warning signs where it can't be ramped. Bigger changes need more than a sign.

Footwear and What You Carry

Safety footwear is PPE under the Personal Protective Equipment at Work Regulations 1992, as amended by the 2022 Amendment Regulations. Under regulation 4 it's provided where the risk isn't adequately controlled by other means, which makes boots the last line of defence, never the fix on their own. Boots with worn tread give you almost nothing on wet mud, so check grip and condition and replace rather than soldier on. The legal and payment detail is in our PPE requirements and who pays guide.

What you carry matters too. HSE suggests mechanical lifting aids rather than carrying unwieldy loads that block the view ahead, because a load you can't see past turns every trip hazard into a blind one. Break loads down, use the barrow, and keep the route to the material area clear.

Writing Slip and Trip Controls Into Your RAMS

None of this helps unless it reaches the page. A slip and trip risk assessment earns its keep by being specific to the site you're standing on. Walk the job, then write what you actually saw: which route gets muddy, where the cables run, which doorway has the step. Our risk assessment step-by-step guide covers the mechanics; this is the construction-specific input.

Site rules are where housekeeping sticks. HSE expects a construction phase plan before the construction phase begins, with site rules covering pedestrian routes and site tidiness, so a rule like "walkway cleared and cables ramped before the gang leaves" has a proper home. Review the assessment when conditions change too: a fortnight of rain, a new scaffold route or a concrete pour all change what's underfoot.

Then brief it. A two-minute talk on where the walkway is and where waste goes will do more than a page nobody reads.