Single vs double: the quick answer
A single carport shelters one vehicle and is the most economical, space-efficient option — ideal for one-car households, units, townhouses and homes where the driveway or side access is narrow. A double carport covers two vehicles side by side under a single roof, giving you room for a second car, a trailer, a boat or a workspace, and it future-proofs the home as your needs grow.
If your block, driveway and council setbacks comfortably allow a double, it is almost always the smarter long-term investment. The roof, posts, footings and engineering are shared across two bays, so the cost per car is lower than building or extending a single later. If space, access or budget are genuinely tight, a well-designed single still delivers excellent protection and value. The rest of this guide unpacks the details that should drive your decision.
Typical dimensions and clearances
Getting the size right is the single most important step. A carport that is too narrow makes opening doors a daily frustration, and one that is too low can rule out larger vehicles. These are the dimensions we work to for Sydney homes, though every design is tailored to your vehicles and your block.
- Single carport width — around 3m to 3.6m is comfortable for one car, allowing room to open doors without squeezing against a post or wall.
- Double carport width — roughly 5.5m to 6m of clear span is the sweet spot for two cars side by side; tighter than this and the middle becomes awkward.
- Length (depth) — about 5.5m to 6m suits most sedans and SUVs; allow 6m or more for utes, dual cabs, 4WDs or a trailer behind the car.
- Height clearance — a standard 2.4m suits most cars, but lift the roof to 2.7m–3.1m if you own a 4WD with roof racks, a van, a caravan or a boat on a trailer.
- Posts and footings — singles usually use four posts, doubles four to six depending on span and wind rating; concrete footings are sized by the engineer for your wind region.
The cost difference explained
A double carport costs more than a single in absolute terms, but it is not double the price — and that is the key to understanding value. Much of a carport's cost sits in the fixed elements: the slab or footings, the engineering certification, the roofing system, the gutters and the labour to install. When you spread those shared costs across two bays, the cost per covered car drops noticeably compared with building a single now and a second carport later.
Material choice also moves the price. A flat or skillion roof in Colorbond steel is the most economical and the most popular across Sydney. A gable roof adds height, airflow and a more substantial look for a moderate premium. An insulated roof using foam-core sandwich panels — the same panel technology behind brands like Bondor — costs more again but keeps the space dramatically cooler under the western sun and gives you a clean, flat ceiling ready for downlights. Steel framing and roofing from BlueScope, supplied through systems such as Stratco, carries genuine structural warranties and is engineered for Australian wind and load conditions.
If you are weighing the numbers, use our carport cost calculator for an instant ballpark, then book a free on-site consultation for an exact fixed price. Interest-free finance options are available to spread the cost, which often makes stepping up from a single to a double surprisingly affordable on the monthly figure.
When a single carport is the right call
A single carport is the better choice more often than people assume. It is not simply the cheaper option — in many situations it is genuinely the correct one for the block and the household.
- You own one vehicle and have no realistic need for a second covered bay.
- Your block is narrow, or the side setback to the boundary won't accommodate a 6m-wide structure.
- The driveway only serves a single lane and can't be widened without major works.
- You want to shelter a single car beside the house while keeping the rest of the yard open for entertaining or a garden.
- Budget is the priority right now and you'd rather invest in a quality single than stretch to a double.
- You're protecting a specific asset — a daily driver, a motorbike under cover, or a car park bay for a unit.
When to step up to a double
A double carport earns its place when you think beyond today's needs. Households grow, second cars arrive, and the cost and disruption of extending a structure later almost always exceed the modest premium of going wider from the start.
Two-car families are the obvious case, but a double also shines when you want flexibility: park one car and keep the second bay for a trailer, a boat, a caravan, a workshop bench or a sheltered spot for the kids' bikes and outdoor gear. If you regularly host visitors, that extra covered space is invaluable. And because so many Sydney buyers — particularly families across Western Sydney and the Macarthur region around Camden, Campbelltown, Narellan and Oran Park — actively look for off-street parking for two cars, a double tends to add stronger resale appeal than a single.
Future-proofing is the deciding factor for many homeowners. Building the slab, footings and roof for two bays now is far cheaper than retrofitting later, when matching the original roofline, gutters and Colorbond colour can be difficult and the second structure rarely looks integrated. If your block and council rules allow it and you can stretch the budget, the double is usually the decision you won't regret.
Block size, setbacks and council considerations
Often it is the block — not the budget — that decides between a single and a double. Before you settle on a width, it pays to understand how your land and local council rules shape what's possible.
Boundary setbacks govern how close a carport can sit to the side and front of your property, and these vary by council and zoning across Greater Sydney. Many carports can be approved as Complying Development when they meet the standard setback, height and size limits, while larger or boundary-hugging structures may need a Development Application. The position of your driveway, any easements, and the fall of the land all influence where posts can land and how wide the structure can go.
A double needs a noticeably wider clear path from the street, so it's worth checking your driveway crossover and the run from the kerb to the carport. A reputable builder will measure the site, confirm the wind region for the engineering, and handle the certification and any approvals for you — so you can focus on the design rather than the paperwork. This is exactly what we resolve during the on-site consultation.
Design tips for either choice
Whether you build a single or a double, a few design decisions make the difference between a structure that looks bolted-on and one that looks like it was always part of the home.
- Match the roof pitch and Colorbond colour to your house so the carport reads as part of the architecture, not an afterthought.
- Choose a flat or skillion roof for a clean modern look, or a gable for extra height, ventilation and a more substantial profile.
- Consider an insulated panel roof if the carport faces west — it cuts radiant heat and lets you add downlights to a flat ceiling.
- Allow generous height clearance if there's any chance of a 4WD, van, caravan or roof racks in the future.
- Integrate guttering and downpipes that tie into your stormwater so the structure stays neat and dry underfoot.
- Add outdoor blinds to one or two sides if you want extra protection from driving rain or low afternoon sun.
- Plan lighting and power early so cabling runs cleanly during the build rather than being retrofitted later.
The verdict
If your block, driveway and setbacks allow it and the budget can stretch, build the double — the lower cost per car, the flexibility for a second vehicle or trailer, and the stronger resale appeal make it the better long-term investment for most family homes. If you have one car, a narrow block or tight access, a quality single carport delivers outstanding protection and value without overcapitalising.
The honest answer for your home depends on measurements only an on-site visit can confirm. We'll assess your block, check the council setbacks, recommend the largest, best-value option you can build, and give you a clear fixed-price quote — at no cost and with no obligation.