Which EV brand has the most interior space? | MVE

The most common argument in favour of EV architecture is the flat floor. No transmission tunnel, no prop shaft, no gearbox taking up space under your feet. On paper, that frees up room.

In reality, some manufacturers have brilliantly taken advantage of this. Others have routed cables, electronics and cooling systems into that freed-up space, reducing the gain to almost nothing.

Why wheelbase matters more than overall length

A car's total length depends partly on the bonnet (short on EVs, usually) and the boot. What determines cabin space is the wheelbase: the distance between the two axles. The longer the wheelbase, the further passengers sit from the wheels, and the more generous the interior becomes.

Well-designed EVs use the space between the axles for the battery (under the floor, within the wheelbase) rather than for the motor (at the extremities). That frees up the cabin while keeping overall dimensions reasonable.

Hyundai-Kia: the cabin space champions

The best example is the Hyundai IONIQ 5. Overall length of 4.64 m, wheelbase of 3.00 m. That's 17 cm more wheelbase than a Tesla Model Y of the same length, and you can feel it inside.

The rear of the IONIQ 5 is generous in all three dimensions: width (flat floor across the full width), legroom (around 990 mm), headroom (950 mm). The rear passengers sit in something closer to a living room than a waiting room.

The Kia EV9 takes this principle to the extreme on a 7-seat SUV. Wheelbase of 3.10 m for a 4.93 m length. The second row slides, the third row has headroom of 820 mm. It's the only production EV in 2026 with a third row that's genuinely usable by normal-sized adults.

Mercedes: the longest wheelbases in the premium segment

The Mercedes EQS (saloon) has a wheelbase of 3.21 m for a 5.22 m overall length. Technically, it's one of the most generous production cars in history in terms of wheelbase-to-length ratio.

Rear space is exceptional: EQS rear passengers have more room than in a traditional S-Class of equivalent length. It's the obvious choice for families or professionals who regularly carry passengers in the back.

The EQE version (smaller, more accessible) maintains good cabin space, with a wheelbase of 3.09 m for a 4.95 m length.

Renault: the pleasant surprise among compacts

The Mégane E-Tech (4.21 m) is shorter than many EVs. And yet, its rear cabin is a surprise. Legroom exceeds 970 mm, which is better than some 4.60 m SUVs.

Renault's CMF-EV platform was designed with a completely flat battery tunnel and peripheral thermal management that doesn't eat into cabin space. The result: a compact that offers the passenger comfort of a larger car.

The Renault Scenic (4.47 m) is even better in this regard. It's the compact SUV that arguably offers the best cabin-space-to-exterior-size ratio on the market in 2026, with interior space comparable to some 4.70 m SUVs.

VW Group: the flat floor advantage partially wasted

The ID.3 and ID.4 do have a flat rear floor. Legroom and seat space are generous. But both suffer from slightly disappointing rear headroom for their size. The coupé-like roofline chosen for styling has penalised headroom.

The ID.7 (saloon) corrects this: 983 mm of rear headroom, exceptional legroom (comparable to the EQE), in a 4.96 m package. For families who want the space of a large saloon in a well-known VW wrapper, it's the answer.

What the numbers don't always tell you

Perceived space isn't just about millimetres. The Hyundai IONIQ 5 feels spacious partly because its windows are large and its horizontal dashboard creates an impression of openness. The Tesla Model Y has comparable space figures but a low-roof sensation at the rear (the glass roof doesn't extend far enough back). These perception details matter as much as tape-measure readings.

Frequently asked questions

Why should EVs be more spacious than ICE cars?

An internal combustion engine requires a gearbox, a drive shaft and a central transmission tunnel running through the entire cabin. In a simple rear-wheel-drive EV, none of that exists. The floor is flat from door to door. For the same exterior dimensions, an EV can therefore have a lower and wider rear floor. In theory. In practice, some manufacturers route cables and thermal management systems into that space, reducing the real-world gain.

Which EV has the best exterior size to interior space ratio?

The Hyundai IONIQ 5 (4.64 m long, wheelbase of exactly 3.00 m) is regularly cited as the best example. On an overall length comparable to a Tiguan, it offers rear space equivalent to a large 7-seat SUV. The secret: a 3.00 m wheelbase (one of the longest in its class) and an entirely flat floor used intelligently.

Is the Volkswagen ID.4 really spacious?

The ID.4 is spacious in width and rear legroom, thanks to the flat floor. Its weak point: rear headroom under the roof arch is slightly disappointing for an SUV of this size. Passengers over 1.85 m may feel cramped vertically in the back. It's a styling choice (a more coupé-like silhouette) that penalises headroom.

Is the Tesla Model Y spacious?

Yes, honestly. The Model Y has an 854 L boot (or 2,158 L with the rear seats folded), a decent-sized rear cabin with 1.87 m of height between the front seats and the rear bench. Its floor is flat at the back. The main limitation: rear headroom is adequate but not exceptional (around 980 mm), and the optional 7-seat version is disappointing (third row reserved for children or short adults on short trips).

Which brand offers the most space for rear passengers?

In the family SUV segment, Hyundai and Kia dominate. The IONIQ 5 has 900 mm of rear headroom and legroom among the best in its class. The EV9 has 840 mm in the third row (acceptable for 1.80 m). In the premium saloon segment, the Mercedes EQS has the longest wheelbase (3.21 m), which translates directly into exceptional rear legroom.

Can small EVs be spacious?

The Renault Mégane E-Tech (4.21 m) is surprising at the rear: 970 mm of legroom, better than some larger SUVs. The VW ID.3 (4.26 m) has rear legroom superior to a Golf, thanks to its flat floor. These two electric compacts confirm that exterior size is no longer the sole determinant of interior space in well-designed EVs.

Which electric car brand offers the most interior space?