Getting your garage floor coated: what actually lasts

What a floor coating job involves

The visible part — rolling on colour and a topcoat — is the quick bit. The job that matters happens first: the concrete is ground back with a diamond grinder to open the surface, cracks and joints are filled, oil stains are degreased, and the slab is checked for moisture that would otherwise push a coating off from underneath. Only then does the primer, colour coat and clear topcoat go down, often over two or three days with cure time between.

Systems vary in both looks and toughness. Plain single-colour epoxy is the budget choice; decorative flake — where coloured chips are broadcast into the wet coat and sealed under clear polyurethane — is the popular middle; and metallic or high-build polyurethane finishes sit at the top for both cost and durability. Most operators are coating specialists rather than general concreters, because the grinding gear and the product knowledge are specific.

How the cost works

Floor coatings are priced per square metre installed, so total area is the first lever — a single garage sits at the low end and a large workshop or several bays runs much higher, with bigger areas usually earning a sharper per-metre rate. The live calculator on this page gives a feel for your own space. Treat every figure as indicative until someone has seen your actual slab.

The system you pick moves the rate, but the hidden variable is concrete condition. A clean, sound slab is cheap to prepare; one with cracks, old flaking paint, oil staining or moisture issues needs extra grinding, repair and sometimes a moisture barrier before a single coat goes on. That's why a suspiciously cheap quote is worth questioning — it often assumes perfect concrete and thin preparation, and the shortfall shows up as peeling later.

Choosing a coating installer

Floor coating is an unlicensed finishing trade, so you're comparing on method and track record rather than a licence number. The single most useful question is whether the floor will be diamond ground — grinding, not acid etching or a quick sand, is the best predictor of a coating that bonds and stays. An installer who leads with preparation is telling you something good about how they work.

Get the system named in writing: primer, colour coat, flake or not, and the topcoat product. Ask about cure times and when you can walk on it and park on it — full cure takes longer than touch-dry, and driving on a green coating ruins it. Photos of jobs a few years old, not just fresh pours, tell you how their work ages, which is the whole point.

Mistakes to avoid

Almost every floor-coating regret traces back to preparation that was skipped to hit a price, or to expectations set on a showroom sample rather than your real slab. A beautiful floor over unground, damp or oily concrete looks perfect on day one and fails from underneath where you can't see it coming.

• Choosing the cheapest quote without confirming the floor will be diamond ground
• Not pointing out oil stains and cracks at quote time, then wearing them as extras
• Ignoring moisture in the slab — trapped damp is a leading cause of coatings lifting
• Parking on a new coating before it has fully cured, not just dried to the touch
• Comparing quotes without matching the coating system and topcoat across them
• Assuming any concreter can do it — coating is a specialist prep-and-product trade