Winter Construction Hire Checklist: Equipment for Cold Weather Sites

Why Winter Sites Need Different Equipment

Between November and March, UK construction sites face conditions that warm-weather planning does not account for. Temperatures regularly drop below 5°C, which is the threshold where concrete curing slows dramatically, paint and adhesives fail to bond, and plaster drying times double or triple. Add shorter daylight — sunrise after 8 a.m. and sunset before 4 p.m. in December — and a standard site setup falls short.

Rain and condensation compound the problem. A newly plastered room or freshly poured slab that would dry naturally in July will sit damp for weeks in January without mechanical drying. Workers in unheated site cabins lose productivity and morale. And dark mornings and evenings create safety risks if the site is not properly lit.

The solution is not to stop working — it is to hire the right equipment to keep conditions within workable parameters. Most of this equipment is only needed for four to five months, which is exactly why hiring makes more sense than buying.

Heating: Keep Workers Safe and Materials Protected

Site heating serves two purposes in winter: keeping workers warm enough to work safely and effectively, and maintaining minimum temperatures for materials that need it. Concrete, plaster, paint, and adhesives all have minimum application and curing temperatures — typically 5°C or above.

For enclosed spaces like site cabins, welfare units, and small rooms under renovation, electric fan heaters in the 3 kW range are the most practical option. They heat quickly, run on standard 110V or 240V supply, and need no ventilation. For larger spaces — workshops, warehouses, and open-plan areas — industrial fan heaters at 9 kW or above deliver the volume of warm air needed to maintain working temperature.

Infrared heaters are a better choice when you need to heat people or surfaces rather than air. They warm objects directly, which means they work in draughty spaces where a fan heater would lose heat immediately. They are also useful for keeping freshly plastered or painted surfaces above minimum temperature overnight.

Drying and Moisture Control

Winter moisture comes from everywhere — rain blowing in through openings, condensation forming on cold surfaces, rising damp from saturated ground, and construction water from wet trades. Without active drying, moisture levels in a building can climb steadily through the winter months, delaying follow-on trades and creating conditions for mould growth.

Dehumidifiers are the primary tool. Refrigerant (compressor) dehumidifiers work well in heated spaces above 15°C, pulling 20-50 litres per day depending on size. For unheated or cold spaces below 10°C, desiccant dehumidifiers are more effective because they do not rely on condensation — they use a chemical wheel to absorb moisture from the air regardless of temperature.

For serious water damage or flood recovery, LGR (low grain refrigerant) dehumidifiers extract moisture more aggressively than standard units. If you are dealing with a burst pipe, flood, or major leak during winter, an LGR unit paired with air movers will dry the space faster than any other combination.

Lighting for Shorter Days

In December, a London construction site gets usable daylight from roughly 8:15 a.m. to 3:45 p.m. — about seven and a half hours. If your shift runs 7 a.m. to 5 p.m., that leaves two to three hours of work in the dark at each end of the day. Without proper lighting, those hours are either wasted or unsafe.

Tripod floodlights are the workhorse solution for most sites. A 30W LED tripod light on 110V provides focused illumination for a specific work area — enough for a room, a section of scaffolding, or a stairwell. They are portable, quick to set up, and run off a standard site transformer.

For larger areas — car parks, external works, road reinstatements — a portable lighting tower gives high-output coverage across a wide area. These units are self-contained with their own power source, so they work independently of the site’s electrical supply.

Twin-head tripod floodlights split the beam across two adjustable heads, which is useful when you need to light two faces of a room or cover a wider angle without running a second unit.

Power Supply: Transformers and Generators

Every piece of winter equipment — heaters, dehumidifiers, lights — needs power. In summer, a single 3 kVA transformer might handle your tools comfortably. In winter, add two heaters, a dehumidifier, and three floodlights, and that transformer is overloaded before your angle grinder even switches on.

Plan your winter power budget before the equipment arrives. A 3 kW heater draws 3,000W. A dehumidifier draws 500-700W. A 30W LED floodlight draws about 35W. Add your regular tools — breakers, drills, saws — and total the wattage. If you are running more than 3 kVA of continuous load, step up to a 5 kVA transformer or run two 3 kVA units on separate circuits.

If the site has no mains supply at all, a portable generator is the answer. A 5 kVA generator provides 110V and 240V outputs and will run a heater, a dehumidifier, and lights simultaneously. For larger sites or multiple zones, you may need a bigger unit or multiple generators — call us to discuss your requirements.

Ground Conditions and Access

Wet winter ground creates problems for access, deliveries, and foundation work. Mud, standing water, and frost all affect how safely people and equipment can move around a site. While ground conditions are partly a site management issue, the right equipment makes a significant difference.

Scaffold towers with adjustable legs handle uneven ground better than ladders, and they give a stable working platform even when surfaces are wet. For sites where the ground is soft or waterlogged, board out walkways and access routes before they churn into mud — it is cheaper than dealing with a slip injury or a stuck delivery vehicle.

If you are pouring concrete or laying foundations in winter, protect fresh concrete from frost with insulating blankets and maintain temperature above 5°C for at least 48 hours after pouring. A heater and insulation setup is far cheaper than having to break out and re-pour a frozen slab.

Winter Hire Checklist: What You Need by Situation

Use this table to match your site conditions to the equipment you need. Most winter sites need items from at least three of these categories.

Common Winter Site Mistakes

These are the issues we see every winter. Each one costs time and money, and all are preventable with basic planning.

No heating until someone complains. By the time workers are cold enough to complain, productivity has already dropped. Get heaters in place before temperatures drop, not after. The Workplace (Health, Safety and Welfare) Regulations 1992 require a reasonable working temperature — there is no specific minimum for construction, but HSE guidance suggests 16°C for sedentary work and 13°C for physical work as starting points.

Drying without dehumidifying. Opening windows to dry plaster in winter introduces cold, damp air that makes the problem worse. A dehumidifier actively removes moisture from the air. A window in January just invites more of it in.

Undersized power supply. A site that ran fine on a 3 kVA transformer in summer suddenly trips constantly in winter when heaters, dehumidifiers, and lights are added. Calculate your winter power draw before the equipment arrives and upgrade the transformer if needed.

No lighting plan for short days. Setting up floodlights after someone trips in the dark is reactive. Plan your lighting positions at the start of winter, before the clocks go back, and keep lights in place until March.

Ignoring frost protection for materials. Concrete poured below 5°C can fail to reach design strength. Adhesives applied in cold conditions may never bond properly. Check material data sheets for minimum application temperatures and use heaters to maintain them.

Equipment Available for Winter Hire

We deliver all winter construction equipment across London. Here is a selection of the most commonly hired items for cold weather sites.

Heating

Drying

Lighting

Power

Related Guides

These guides cover specific equipment decisions in more detail.

Frequently Asked Questions