Building a cold garage: A guide to an affordable and functional solution

Not everyone needs a warm and insulated space for their car. Often, the most important task is simply to protect the vehicle from rain, snow, sunlight and falling leaves. For this purpose, a cold garage is by far the most cost-effective and simplest solution. It is quick to erect and requires significantly less complex structural solutions than its warm counterpart. However, when implemented correctly, a cold garage is much more than just a canopy – it is a functional and durable shelter that will serve for decades.

Why is a cold garage often sufficient?

Most of the stress that reduces the value of a car comes from direct weather exposure. A cold garage eliminates the most important of these:

• Winter protection: No more shoveling snow off your car or scraping windows.
• Summer protection: UV radiation that fades the paint surface and tree resin cannot damage the car.
• General cleanliness: Your car stays cleaner when it is protected from rain and pollen.
• Costs: Construction costs are up to 30–50% lower than in a heated garage, and there are no operating costs (heating) at all.

Structure: Simplicity is the key

The structure of a cold garage is stripped of everything superfluous. The most important thing is a durable frame and a water-resistant roof.

Foundations: Since the building is not kept warm, the risk of frost heave is lower, and the foundations can be lighter. The most common and functional solution is a concrete slab on the ground, the edges of which are reinforced and equipped with a foundation wall plate. Pillar foundations are also a possible option. Frost insulation is still recommended to ensure the stability of the foundations.

Wall structure: Unlike in a warm garage, a cold garage does not use a vapor barrier or thick layers of insulation. The correct layer order from outside to inside is:

1. Exterior cladding (wood or sheet metal)
2. Ventilation gap (approx. 22 mm)
3. Windshield
4. Load-bearing frame

   No cladding is necessarily required on the inside. If interior cladding is installed (e.g. plywood or boards), it is absolutely important that no vapour barrier is installed between it and the windbreak.

   Ventilation is the most important feature of a cold stable

   This is a point where you should not make any adjustments. When a wet or snowy car is driven into a closed space, moisture evaporates into the air. If there is insufficient ventilation, this moisture condenses on cold surfaces – the car’s bodywork, tools and structures – and causes rust and rot.

   The principle of effective ventilation:

   • Replacement air: Install at least two large valves near the door, approximately 20–30 cm from the floor.
   • Exhaust air: Install at least two valves on the opposite wall as high as possible, close to the ceiling line.
   • Eaves ventilation: Make sure that air can also circulate under the eaves in the direction of the roof surface.

     This creates gravity ventilation that circulates air and effectively removes moisture.

Invest in ventilation: Adequate ventilation is the most important factor in the functionality of a cold garage and prevents moisture condensation.

Do not install a vapor barrier: A vapor barrier prevents the natural drying of structures and can cause moisture damage in cold spaces.

A simple structure is enough: A functional wall structure consists only of exterior cladding, a ventilation gap, a windbreak and a frame.

Lighter foundations save costs: Since frost insulation requirements are lower, savings can be made on foundations.

Perfect weather protection: A cold garage offers excellent protection for your car at a fraction of the cost of a warm garage.