
Yes, fitting three car seats across the back seat of a Impreza is possible, but it is a very tight squeeze and highly dependent on the specific type and size of the car seats you choose. The Impreza is a compact sedan, so its rear seat width is limited. For a successful installation, you will almost certainly need to use a combination of narrow-profile car seats and will likely need to forgo using the lower LATCH anchors for the center seat, relying instead on the vehicle's seat belt for installation.
The Impreza's rear seat is approximately 52 inches wide, which is competitive for its class but still narrow for three separate child restraints. The key challenge is the shape of the seat cushions and the intrusion of the wheel wells, which can limit how closely you can push seats together. The lower LATCH anchors are only available for the two outboard seating positions; the center position must use the seat belt, which is a standard and safe practice when done correctly.
| Vehicle Model | Rear Seat Hip Room (Width) | Rear Shoulder Room | LATCH System (Lower Anchors) |
|---|---|---|---|
| Subaru Impreza | 52.0 inches | 53.7 inches | Two sets, outboard only |
| Honda Civic | 51.9 inches | 55.2 inches | Two sets, outboard only |
| Toyota Corolla | 51.7 inches | 54.0 inches | Two sets, outboard only |
| Hyundai Elantra | 51.7 inches | 53.9 inches | Two sets, outboard only |
Your best bet is to physically test-fit your specific car seats. If you're purchasing new seats, look for models specifically marketed as "slim" or "three-across" friendly. Brands like Diono, Clek, and Graco offer some narrower options. Always consult both your vehicle's owner's manual and the car seat manuals for installation instructions and confirm a secure, non-moving fit (less than one inch of movement at the belt path) for each seat before driving.

We tried this in our 2019 Impreza with two Graco SlimInfant seats and a forward-facing convertible seat in the middle. It worked, but just barely. The door had to be pushed shut. Honestly, it was such a hassle to buckle the kid in the middle that we just gave up and decided it wasn't a long-term solution. The car is great, but for three kids in car seats, you're going to want something wider, like an Outback or a minivan.

As a certified Child Passenger Safety Technician (CPST), the primary concern is correct installation. The Impreza's center seat is the safest spot, but it requires a seat belt install. You must check for a independent, tight fit for all three seats with less than one inch of movement. The narrow seat base can cause "overhang," where seats don't rest flat. This can compromise safety. I strongly recommend a professional check-up after attempting this configuration.

Focus on the type of car seat. For three-across, you'll need narrow, convertible seats. The Diono Radian 3RXT is a popular choice because it's only 17 inches wide. Avoid bulky infant travel systems. The Impreza's seat belt buckles are recessed, which can make installation tricky. Be prepared to use a locking clip or the seat's built-in lock-off. It's a puzzle, but with the right pieces, it can be solved.

From a pure numbers standpoint, the Impreza's interior dimensions are very similar to its main competitors like the Civic and Corolla. None of these compact cars were designed with three child seats as a primary use case. The real-world usability comes down to a few inches of plastic and fabric. If this is a permanent need, the slight size increase of a compact SUV like a Forester provides a significantly more practical cabin space and easier daily use.


