What Size Carport Do I Need in the UK?
Choosing the right carport size sounds straightforward, but in real life it depends on more than the number of vehicles you own. Door-opening space, driveway shape, turning room, bins, bikes, EV charging habits and even the type of car you may own in five years all affect whether a carport feels comfortable or awkward to use.
This guide explains what size carport usually works best in the UK, with practical dimensions for single, double and triple layouts. It is written as a sizing guide first rather than a sales page, so the focus stays on usable space, everyday comfort and avoiding the common mistake of building too tightly.
The short answer
- Single carport: usually around 3.0-3.3 m wide and 5.0-5.5 m deep
- Double carport: usually around 5.5-6.0 m wide and 5.0-6.0 m deep
- Triple carport: usually around 8.5-9.0 m wide and 5.5-6.0 m deep
- Practical eaves height: usually 2.1-2.4 m for most cars and SUVs
- Key rule: size for the largest vehicle you realistically expect to own, not the smallest one parked there today
- Important: a carport that technically fits a vehicle is not always one that feels easy to use every day
A quick note on scope
This article is about carport sizing rather than comparing every structure type in depth. If you are still deciding whether an open carport is the right solution at all, read our guide to carport vs garage first.
Unless stated otherwise, the dimensions below refer to usable internal sizing rather than a supplier's outer roof span. That distinction matters, because daily comfort depends more on the clear space between posts than on the overall footprint shown in a brochure.
In this guide
- Typical UK carport dimensions at a glance
- What is the standard carport size in the UK?
- How wide does a carport need to be?
- Single, double and triple carport dimensions
- SUV, van and EV considerations
- How tall does a carport need to be?
- Measuring your driveway before you order
- How driveway shape changes the best size
- When a bigger carport is worth it
- When size starts to affect planning
- Common sizing mistakes
- FAQ
- Final takeaway
Typical UK carport dimensions at a glance
For most households, the first sizing decision is not design style but how many bays you genuinely need. The table below gives a useful starting point for everyday domestic use.
| Carport type | Typical internal width | Typical internal depth | Typical eaves height | Best for |
|---|---|---|---|---|
| Compact single | 2.7-3.0 m | 4.8-5.0 m | 2.1-2.2 m | Small hatchbacks, tight plots |
| Standard single | 3.0-3.3 m | 5.0-5.5 m | 2.1-2.4 m | Most cars and many SUVs |
| Standard double | 5.5-6.0 m | 5.0-6.0 m | 2.2-2.4 m | Two-car households |
| Standard triple | 8.5-9.0 m | 5.5-6.0 m | 2.2-2.5 m | Three bays, vans, storage overflow |
What is the standard carport size in the UK?
There is no single universal standard, but in practical UK terms a single carport is often around 3.0 m wide by 5.0 m deep, a double is often around 5.5-6.0 m wide by 5.0-6.0 m deep, and a triple is often around 8.5-9.0 m wide by around 6.0 m deep.
That said, the more useful question is not whether a size is “standard” on paper, but whether it gives enough space for your real vehicle, your real driveway and the way you actually get in and out of the car every day.
A practical sizing rule
A carport should cover more than the parked vehicle itself. It should also leave enough room for doors to open sensibly, people to move around the car, and the vehicle to be parked without awkward inch-perfect manoeuvring every time.
How wide does a carport need to be?
For a small car, around 2.7 m internal width is about the smallest practical starting point, but for most UK households 3.0-3.3 m feels more comfortable. That extra width makes everyday parking easier and gives better door-opening space, especially in bad weather or when loading children, shopping or bags.
For a double carport, 5.5 m can work at a squeeze for two average cars, but 6.0 m is usually the better real-world target. It reduces the feeling that both vehicles have to be parked perfectly every time.
A useful rule of thumb is to think about the car door partly open at an angle, not just the closed width of the vehicle. A layout can look generous in an online diagram and still feel too tight once people are actually using it.
Single, double and triple carport dimensions
Single carport
A single carport usually works best at 3.0-3.3 m wide and 5.0-5.5 m deep. Compact versions can start around 2.7 x 4.8 m, but that tends to suit smaller hatchbacks rather than larger family cars.
If space on the plot is tight, it is often better to keep the structure single-bay and slightly more generous than to force a cramped design that only just fits the current car.
Double carport
A double carport is usually around 5.5-6.0 m wide and 5.0-6.0 m deep. For many two-car households, 6.0 m width is the practical sweet spot because it gives a noticeably easier day-to-day experience than a tighter layout.
Double carports are often the most balanced choice for UK homes because the second bay rarely goes to waste. Even when one space is not constantly occupied, it often becomes useful for bikes, bins, loading cover or general flexibility.
Triple carport
A triple carport is commonly around 8.5-9.0 m wide and 5.5-6.0 m deep. It makes most sense when the third bay already has a clear purpose, such as a van, trailer, workshop overflow, bike storage or a dedicated sheltered bay for household use.
In practice, triple layouts work best on wider plots where the structure still feels proportionate. They are usually worth it when the third bay solves a real current need rather than a vague future possibility.
SUV, van and EV considerations
Larger vehicles change the sizing logic quickly. A single carport that feels fine for a hatchback can become frustrating with a wider SUV, roof bars or a van with taller bodywork.
- Small hatchback: compact single sizes can work
- Estate or family saloon: standard single is usually more comfortable
- Mid-size SUV: aim for at least the upper end of standard single sizing
- Large SUV: many households are happier closer to 3.3 m wide and 5.5 m deep
- Transit-size van: often needs around 3.3-3.6 m wide and 6.0-6.5 m deep, with extra height
Electric vehicles do not always need more physical space than petrol or diesel models, but they often change how the carport is used. If charging cable access, wallbox position or sheltered loading matters, a slightly wider bay can make the space work much better.
Attached vs freestanding
An attached carport can feel tighter because one side may sit closer to the house wall, which changes door-opening comfort and pedestrian movement. A freestanding carport can sometimes make the same nominal width feel easier to use because access is less constrained around the edges.
How tall does a carport need to be?
For most ordinary passenger cars, around 2.1 m eaves height is the practical minimum. In many real domestic settings, 2.2-2.4 m feels more comfortable, especially for SUVs, estates and cars with roof accessories.
Vans and campervans often need more generous headroom, and this is the point where a “standard” layout can stop working. Height is one of the first things to check properly rather than assume, especially if the vehicle type may change later.
| Vehicle type | Typical recommendation | Note |
|---|---|---|
| Small to mid-size car | 2.1-2.2 m eaves | Usually fine for standard daily use |
| SUV / estate | 2.2-2.4 m eaves | More forgiving for taller vehicles and roof bars |
| Van / campervan | Often 2.6 m+ | Should be sized to the actual vehicle |
Measuring your driveway before you order
The best approach is to measure more than the parking rectangle itself. Width, depth, turning angle, gate pinch points and how the vehicle actually approaches the space all matter.
- Measure the usable width, not just the widest point
- Check the approach angle from the road or driveway entrance
- Allow for post positions, not just roof span
- Think about door opening and walking space
- Account for bins, bikes, walls, fences and steps
If site access is awkward or you are unsure how the structure would realistically be installed, it also helps to read how garden buildings are delivered and installed in the UK. Installation constraints can sometimes influence the most sensible size or layout.
How driveway shape changes the best size
A carport should never be chosen in isolation from the driveway. The same nominal dimensions can feel easy on one site and awkward on another purely because of access.
Long, narrow driveways
These often suit single-bay layouts or more linear parking arrangements, because width can be the limiting factor long before depth is.
Wide, shallow frontages
These are often ideal for double or triple side-by-side formats, because vehicle access is more natural and the structure does not need to stretch too deeply into the plot.
Irregular or angled layouts
On awkward plots, the right answer is not always “bigger”. Sometimes the better solution is a layout that follows how the driveway is actually approached rather than the maximum rectangle that seems to fit on paper.
When a bigger carport is worth it
A small amount of extra width or depth is often wise. It usually improves everyday comfort, makes the carport easier to live with and gives some flexibility if the household later moves from a hatchback to an SUV or from one car to two.
That is different from oversizing for no clear reason. Jumping from a double to a triple layout “just in case” only makes sense if the third bay already has a believable purpose, such as a van, trailer, covered storage or a specific household need.
If budget is part of the decision, it is worth comparing that extra footprint against the likely uplift in build cost. Our guide to carport prices in the UK explains how single, double and triple layouts usually differ on the cost side.
When size starts to affect planning
Size matters not only for comfort but also for planning risk. For many houses in England, a modest carport can often be simpler from a planning point of view, but once the structure becomes taller, more prominent or closer to boundaries, the position needs more careful checking.
As a general guide, outbuildings close to boundaries are usually more restricted. If any part is within 2 m of a boundary, the overall height often needs to stay at or below 2.5 m. Away from the boundary, the usual upper limits are often around 4 m overall for a dual-pitched roof or 3 m for another roof type. The exact planning position still depends on siting, property type and local constraints, so use this as a prompt to check rather than a substitute for legal advice.
For the detailed planning side, read planning permission for a carport in the UK. It covers the height rules, front-of-house siting, boundary relationships and the wider permitted development context properly.
Common sizing mistakes
- Choosing size only by number of vehicles, without thinking about access
- Using the current smallest car as the benchmark instead of the likely long-term one
- Confusing outer roof span with usable internal space
- Ignoring post positions and door-opening comfort
- Overbuilding to a triple layout without a clear use for the third bay
- Forgetting that height matters just as much as width and depth
- Not checking whether the driveway approach actually makes the chosen size practical
FAQ
What is the standard carport size in the UK?
For a single carport, roughly 3.0 m wide by 5.0 m deep is a common starting point. A double is often around 5.5–6.0 m wide by 5.0–6.0 m deep, while a triple is often around 8.5–9.0 m wide by around 6.0 m deep. In practice, usable internal space matters more than the headline outer size.
How wide does a carport need to be?
Around 2.7 m internal width is about the smallest practical starting point for a small car, but 3.0–3.3 m is more comfortable for most UK vehicles. For a double carport, 5.5 m can work, while 6.0 m is usually the more forgiving everyday width.
How wide is a single carport?
Most UK single carports are around 3.0–3.3 m wide. Compact versions can begin around 2.7 m, while more generous singles for larger SUVs and estates often move closer to 3.3–3.6 m.
What size is a double carport?
A double carport is usually around 5.5–6.0 m wide and 5.0–6.0 m deep. Around 6.0 m width is often the practical sweet spot for households that use both vehicles regularly.
What is the minimum practical carport size?
Around 2.7 x 4.8 m is about the smallest practical benchmark for a small hatchback. Anything tighter than that usually makes parking, door opening and daily movement around the car feel awkward.
How tall does a carport need to be?
Around 2.1 m eaves height is usually the practical minimum for ordinary cars. For estates and SUVs, 2.2–2.4 m is more comfortable. Vans and campervans often need significantly more.
What size carport do I need for an SUV?
For a mid-size SUV, a standard single around 3.0 x 5.0 m is often adequate, but a little more width usually improves comfort. For a larger SUV, many households are happier closer to 3.3 x 5.5 m with around 2.2–2.4 m eaves height.
What size carport do I need for a van or campervan?
A Transit-size van often needs something around 3.3–3.6 m wide by 6.0–6.5 m deep, with taller eaves than a standard passenger-car bay. Campervans should always be sized to the actual vehicle plus working clearance, especially in height.
Can I fit two cars under one carport?
Yes. That is exactly what a double carport is for. Around 5.5 m internal width can work for two average cars, while 6.0 m is usually more comfortable for everyday use.
Does carport size affect planning permission?
Yes, it can. Larger or taller carports, front-of-house positions and structures close to boundaries are more likely to need careful planning checks. The size question and the planning question often overlap, especially on tighter plots.
Should I size it for my current car or a future one?
As a rule, size for the largest vehicle you realistically expect to own over the next several years. Carports are long-term structures, so sizing only for today's smallest car is one of the most common causes of regret later.
Final takeaway
The best carport size is not the largest structure your driveway can technically fit. It is the smallest size that still feels practical, comfortable and realistic for everyday use.
For many UK homes, that means a standard single or a well-sized double rather than the biggest possible option. A little extra room usually helps. A lot of extra room only pays off when there is already a clear reason for it.
If you size for the driveway, the largest likely vehicle and the way the space will actually be used, you are far more likely to end up with a carport that still feels right several years from now.
