Defender 110 vs Defender 90: Which Rear Seat Conversion Is Right for You?
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If you’re considering a rear seat conversion for your Land Rover Defender, you’ll need to decide between the Defender 90 and the Defender 110. Both can be converted, but they serve different purposes and the conversion result is meaningfully different. Here’s how to choose.
The fundamental difference
The Defender 110 is a longer wheelbase vehicle with a larger load bay. A rear seat conversion on the 110 adds a full-width 3-person rear bench, turning it into a 5-seat vehicle. The Defender 90 is shorter, and a conversion adds a 2-person rear seat, giving you a 4-seat vehicle.
| Defender 90 (L663) | Defender 110 (L663) | |
|---|---|---|
| Wheelbase | Short (2,587mm) | Long (3,022mm) |
| Seats after conversion | 4 seats | 5 seats |
| Rear passenger capacity | 2 | 3 |
| Boot space remaining | Very limited | Moderate |
| Price | £4,200 | £4,200 |
When to choose the Defender 110 conversion
The 110 is the right choice for most people who need regular rear passenger use. The longer wheelbase means the rear seat has meaningful legroom, and you still retain some boot space behind the seat for bags, tools, or equipment. If you regularly carry clients, colleagues, or family, the 110 is the practical choice.
It’s also worth noting that the 110 Commercial is the more commonly converted vehicle — it’s the version most business owners run as a company vehicle, and the one where the supply-and-fit conversion makes the most commercial sense.
When to choose the Defender 90 conversion
The 90 is a more specialist choice. The shorter body means the rear seating area is tighter, and boot space after conversion is minimal. It suits owners who primarily drive alone or with one passenger but occasionally need to carry two rear passengers — family weekends, site visits with a colleague, and so on.
If you bought the 90 for its compact dimensions and agility, a rear seat conversion lets you keep the vehicle you love while adding flexibility without replacing it with a larger 110.
What about daily practicality?
One advantage of both conversions is that the rear seat folds flat when not in use, restoring the load area. So you’re not permanently giving up cargo capacity — the vehicle works as a commercial when you need it and as a passenger vehicle when you don’t.
This fold-flat function is part of what makes a certified conversion different from simply bolting in a fixed aftermarket seat. The whole system — seat, belts, and fold mechanism — is designed to work together as an integrated, certified unit.
Does the choice affect the cost?
No — both conversions are priced at £4,200 including VAT for supply and fit. The price is the same regardless of which model you’re converting.
Not sure which you have?
The easiest way to tell a Defender 90 from a 110 is the overall body length and the number of side windows behind the B-pillar. The 110 has a visibly longer rear quarter. Your V5 registration document will also show the model designation.
If you’re still not sure, contact us with your registration and we’ll confirm compatibility before you order.