What a carport is actually made of

The frame: aluminium against galvanised steel

Steel is stronger per section, which is why it makes long spans possible with a slimmer profile, and it is usually cheaper as raw material. Its problem here is not strength but chemistry. Galvanising protects steel until the coating is broken — at a drilled hole, a cut end, a scratch from a ladder — and in humid, salt-laden coastal air the rust starts at exactly those points and travels underneath the paint.

Aluminium does not rust. It forms its own oxide layer and stops, which is why it is the default for anything permanently outdoors on this coast. It is less stiff than steel, so sections are deeper for the same span, and that is the honest trade: a slightly chunkier frame in exchange for not repainting it.

If steel is chosen — and there are good reasons to, particularly for very long spans — the details to insist on are hot-dip galvanising after fabrication rather than before, and stainless fixings. A steel frame welded and drilled after galvanising has bare metal at every joint, and in five years you will see exactly where.

The roof, and how hot it gets underneath

Insulated sandwich panels — two metal skins with a foam core — are the best all-round roof here. They block the sun completely, the core slows the heat coming through, and the underside stays cool enough that the space beneath is genuinely shaded rather than merely covered. They are the most expensive of the common options and the one that makes the biggest difference to a parked car in July.

Polycarbonate is translucent, light and inexpensive, and it is the material most often regretted. It transmits a substantial part of the sun's energy, so the car underneath still heats up; the greenhouse effect under a closed polycarbonate roof can make it worse than open shade. Multi-wall and tinted grades reduce this, and the good ones carry a coating that resists ultraviolet. The cheap ones yellow and go brittle, and here that happens in a small number of years rather than a decade.

Aluminium louvres are the third answer and an underrated one: fixed or adjustable blades that block direct sun while letting hot air rise straight out. The car gets dappled rather than complete shade, but the space never becomes an oven, and there is no sheet material to degrade.

Fabric — tensioned membrane — is the cheapest and the most temporary. It looks good when new, it moves attractively in wind, and it is a consumable: the material has a service life measured in a few years here, after which it is a replacement rather than a repair.

Layout: cantilever, post-and-beam, or wall-mounted

A cantilevered carport carries the roof from posts on one side only, so the parking bay is clear of obstructions. It is the most comfortable to use — no post to squeeze past with shopping, no risk of a mirror finding one — and it is the most expensive, because the structure and its foundations must resist the whole roof trying to tip.

A post-and-beam carport with supports on both sides is the straightforward option and materially cheaper. On a wide driveway where the posts sit clear of the doors it is entirely sensible, and it is what most villas end up with.

A wall-mounted canopy takes half its support from the villa. It is neat where the driveway runs alongside the house, and the decisive question is what that wall is made of. Fixing into structural concrete is one job; fixing into rendered blockwork or a cladding panel is another, and it needs designing rather than assuming.

The parts nobody asks about

Drainage. A flat roof over a driveway collects the year's rain in a few events, and it has to go somewhere other than onto the car door or across the paving where it will leave a stain. Ask where the water leaves and where it lands.

Foundations. A carport is a large surface in a windy place, and the wind load is what sizes the footings. On a driveway already paved, that means breaking out and reinstating sections — visible work that should appear in the quote rather than as a surprise.

Lighting and power. Running a conduit while the structure is up is trivial; adding it afterwards means lifting paving. Even if lights are not in the budget now, put the route in.

And community approval. A carport is a permanent structure visible from the street, and in Emaar and Dubai Holding communities (Nakheel, Meraas, Dubai Properties) it always needs written approval (NOC) before work starts. Other communities have their own rules on height, projection and finish. Check before ordering rather than after.