18 July 2023 · Sharon Winson
Can you render a concrete garage?
Yes — rendering is a proven way to change the look of a concrete garage and add a layer of weather protection at the same time.
Yes, you can render a concrete garage. Rendering means applying a layer of cement or polymer-based coating to the external walls, and it works well on sectional concrete panels — transforming a plain grey building into one that matches your house, while adding a protective skin against the weather.
How do you prepare a concrete garage for rendering?
Preparation decides how long the render lasts. The concrete must be clean — free of dust, dirt and anything loose — and any cracks should be repaired before you start. A bonding agent or primer applied to the panels then gives the render something to grip, which matters on the smooth face of a precast panel.
Skipping preparation is the most common reason rendered finishes fail, so it's worth doing properly even though it's the least exciting part of the job.
What type of render should you use?
There are two main families. Traditional cement-and-sand render is the familiar option and can be painted any colour once cured. Modern polymer-based renders — K Rend is a well-known example — offer better resistance to weathering and water ingress, and because they're through-coloured they don't need painting after application.
For a garage, the polymer systems are attractive precisely because they're low maintenance: the colour is in the material, so there's no repaint cycle to keep up with.
How is the render applied?
Render goes on with a trowel or rendering tool, worked across the prepared panels in even coats, then finished to the texture you want. Once applied it needs to cure — typically a few days — before the surface reaches full hardness.
A competent DIYer can render a small building, but getting a flat, consistent finish across large panels is genuinely skilled work, which is why a professional renderer is often the recommendation for anything you'll look at every day.
Is rendering a concrete garage worth it?
If looks matter on your plot, yes. Render does two jobs at once: it changes the appearance completely, and it acts as a protective layer shielding the concrete underneath from moisture and weather. A rendered concrete garage next to a rendered house reads as part of the property rather than an outbuilding.
If you're still at the planning stage and want a finished look from day one, it's also worth weighing a brick-built garage against rendering a concrete one.
For softer ways to smarten up a garage, see beautifying a concrete garage. If you want a traditional finish from the start, look at our brick buildings — or browse the standard concrete garage ranges to see what you'd be starting with.
Will render stick to precast concrete panels?
Yes, provided the surface is clean and you use a bonding agent or primer first. The smooth face of a precast panel needs that key for the render to grip properly.
Do polymer renders need painting?
No — polymer renders such as K Rend are through-coloured, so the colour runs through the material and there's nothing to repaint. That's a big part of their appeal on a garage.
How long does render take to cure?
Typically a few days, depending on the product and the weather. Follow the manufacturer's guidance before painting or fixing anything to the surface.
Should I render my garage myself or hire a professional?
For a finish you'll be happy with long term, a professional renderer is usually the better call. Rendering large flat panels evenly is skilled work, and mistakes are hard to hide.