- Specify the bay as one system: an insulated door, a close seal around the trailer and an insulated leveller work together, and one weak link lets warm, moist air in.
- In frozen stores, heated door frames, thresholds and seals help stop ice forming where moving parts meet, so doors keep closing properly and seals keep sealing.
- Loading houses or dock pods outside the insulated envelope let the main door close on the building line while the leveller and shelter sit outside the cold box.
- Every figure here is a guide budget excluding VAT; the fixed price comes from the written quote after a site survey, which is free and without obligation.
What makes a cold store loading bay different?
A cold store loading bay is a dock where the building is chilled or frozen, so every opening, gap and moving part is a route for warm, moist air to get in and for cold air to escape. That changes how you choose the door, the seal around the trailer, the leveller and even where the dock sits relative to the insulated box.
In an ambient warehouse, a draughty dock is mainly a comfort and heating issue. In a chilled or frozen store, the same gaps cause condensation, frost and ice on floors, door tracks and seals, more work for the refrigeration plant and a harder job keeping product inside its temperature range. Hygiene matters too, especially for food and pharmaceutical goods.
The equipment is the same family as a standard dock: doors, levellers, shelters or seals, bumpers and safety controls. The difference is in the specification. For the wider picture of what a temperature-controlled operation needs, see our cold storage and chilled distribution page.
Which door should you use on a chilled or frozen dock?
Most chilled and frozen docks use a purpose-built insulated cold store dock door, usually an overhead sectional design with thick insulated panels and seals on all four sides. Common sectional door panels are 40 to 80 mm thick insulated steel; cold store versions sit at the heavier end and add details such as thermally broken sections and improved seals at the floor, head and jambs.
Points to settle at the specification stage:
- Insulation and seals: panel thickness, thermal breaks and the quality of the bottom, side and head seals.
- Heating: in frozen stores, heated frames, heated bottom seals or heated thresholds help stop the door freezing to the floor or to its guides.
- Operation: an electric operator with safety edges, and how the door is opened and closed in each loading cycle.
- Finish: smooth, wipe-clean surfaces where hygiene matters.
As a guide, cold store dock doors cost £4,800 to £9,500 per door, excluding VAT, supplied and fitted. Size, insulation, heating, operator and access all move the price.
On busy chilled docks, a fast-acting door behind the insulated dock door, or between the dock area and the cold chamber, adds a second barrier that opens and closes quickly. As a guide, high-speed dock doors cost £6,500 to £14,500 per door, excluding VAT.
How do you stop ice and frost forming at the dock?
Ice forms at a cold store dock when warm, moist outside air meets cold surfaces, so the fix is to limit how much air gets in and to keep the surfaces that must move or seal slightly warmer. Condensation forms first; in a frozen store it then freezes on door tracks, seals, threshold plates and the leveller.
- Seal the trailer properly: a close seal around the trailer stops outside air being drawn in while the door is open.
- Heat the critical points: heated door frames, heated seals and threshold heating keep moving and sealing surfaces clear of ice.
- Keep open time short: open the door only once the trailer is sealed against the dock, and close it as soon as loading finishes.
- Manage internal openings: fast-acting doors or PVC strip curtains between the dock area and the cold chamber limit air movement deeper into the building.
- Drain and clean: meltwater and spillage at the dock need somewhere to go, or they refreeze as a slip hazard.
- Watch for fog: when warm, moist air meets cold air at an open door, fog can form and reduce visibility for drivers and truck operators. Better sealing and shorter open times reduce it.
Ice is not only a nuisance. A door that freezes to the floor puts strain on its operator, and ice on the dock or leveller deck is a slip risk for staff and a traction problem for pallet trucks.
Are inflatable dock shelters better for cold stores?
Inflatable dock shelters are often the preferred choice for chilled and frozen docks because they seal closely around the top and sides of a trailer while leaving the full rear opening clear. When a trailer is in position, the air bags inflate against the trailer body; when it leaves, they deflate and retract.
The alternatives each have a place:
- Dock seals: foam pads that compress against the trailer. They give a close seal and cost less, but they suit consistent trailer sizes and can narrow the usable opening.
- Retractable curtain shelters: flexible curtains on a sprung frame. They suit mixed fleets but generally leave more gaps than an inflatable shelter or a compressed seal.
- Inflatable shelters: a close seal across a range of trailer sizes, with a fan, controls and a power supply to look after.
As a guide, inflatable dock shelters cost £6,800 to £12,800 per shelter and dock seals £1,100 to £2,600 per set, excluding VAT. The right choice depends on your fleet, how much trailer heights and widths vary, and how cold the store runs.
Does the dock leveller need to be insulated?
Yes, on most chilled and frozen docks the dock leveller should be insulated and sealed, because a leveller pit is a large opening in the floor line at exactly the point where the building meets the outside. Air leaks around the deck edges and through the pit, and an uninsulated steel deck lets cold travel outwards and warmth travel in.
Common measures include:
- insulation on the underside of the deck;
- brush or rubber seals along the sides and back of the deck;
- a layout where the door closes on the building side of the leveller, so the leveller sits outside the cold envelope when the door is shut;
- hydraulic oil and components suited to the temperature the bay works at, confirmed against the manufacturer's specification.
If the leveller has to sit inside the door line, the deck insulation and pit seals become more important, and condensation in the pit needs attention. Leveller prices assume an existing, sound pit; new or modified pits are priced separately after survey.
Should a cold store dock sit inside or outside the building?
For many cold stores the best layout puts the dock outside the insulated envelope, in a loading house or dock pod, so the main door closes on the building line and the cold box stays sealed when no trailer is present. The leveller, shelter and bumpers sit in the pod, and only the door forms the barrier to the cold store.
This layout has practical benefits:
- there is no leveller pit cut into the cold floor, so the insulated floor and its vapour control stay intact;
- the door seals directly onto a flat floor or threshold;
- internal floor space is not lost to dock equipment.
Loading houses are a significant investment, at a guide £14,500 to £32,000 per house excluding VAT, and as external structures they can need planning permission, which we check at survey. Our guide to loading houses explained covers the options in detail.
What about hygiene, door speed and staff working in the cold?
Cold store docks need wipe-clean finishes, fast door cycles and a layout that keeps staff exposure to the cold as short as practical. These three points often decide between two otherwise similar specifications.
- Hygiene: choose smooth, cleanable surfaces, avoid ledges and crevices that collect debris, and make sure seals and shelter curtains can be cleaned or replaced as part of your hygiene routine.
- Door speed: the longer a door is open, the more warm air gets in. Fast-acting doors on internal openings, and controls that link door opening to the trailer being in position, help keep open time down.
- Staff in the cold: loading teams move between ambient and chilled areas many times a shift. Cutting draughts, ice and waiting time at the dock is part of looking after them; your own risk assessment sets the controls for clothing, breaks and rotation.
Interlocks are worth considering here, for example so the door only opens once the trailer is restrained and the shelter is inflated. See dock traffic lights and interlocks for the options.
How much does a cold store loading bay cost?
A cold store loading bay usually costs more than an ambient one, because the door, seal and leveller are all specified for temperature and the layout may include a loading house. As a guide, excluding VAT, supplied and fitted:
- cold store dock door: £4,800 to £9,500 per door;
- inflatable dock shelter: £6,800 to £12,800 per shelter;
- swing-lip dock leveller: £5,200 to £8,800 per leveller, assuming a sound existing pit;
- loading house: £14,500 to £32,000 per house.
What moves the price: opening size, insulation and heating, operator and controls, groundworks and pits, electrics, access and any out-of-hours working needed to keep the store running. The written quote after survey is the fixed price, and the survey and quote are free and without obligation. Compare wider guide figures on our prices page.
Questions
Can I use a standard sectional door on a chilled dock?
On a lightly chilled dock, a well-insulated sectional door with good seals can work. Frozen stores usually need a purpose-built cold store door with thicker insulation, thermal breaks and heated frames or seals to stop ice forming. We look at the store temperature, how often the door opens and the condition of the opening at survey, then recommend the door that suits the duty rather than simply the cheapest option.
Why does ice build up on our dock door?
Ice builds up when warm, moist outside air gets into the cold zone and meets cold surfaces, where it condenses and then freezes. Common causes are worn or missing seals, a gap around the trailer, doors left open longer than needed and no heating on the frame or threshold. A survey usually shows the route the air is taking, and the fix is often a combination of better sealing and heating.
Do loading houses need planning permission?
They often can, because a loading house is an external structure added to the building. Whether permission is needed depends on the site, its planning history and local rules. Structural work may also need Building Regulations approval, a building warrant in Scotland or building control approval in Northern Ireland. We check this at survey and tell you what is likely to apply before you commit.
Do PVC strip curtains work in cold stores?
PVC strip curtains can help on internal openings and as a secondary barrier, because they limit air movement while letting people and trucks pass through. They are not a substitute for a sealed dock door to the outside. In frozen areas, choose strips made for low temperatures so they stay flexible, and replace damaged strips promptly so gaps do not open up.