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Guide to Help You Find the Best Roof Box
Do all roof boxes look the same online? Our detailed roof box guide explains sizing, vehicle compatibility, roof bar fitment and how to choose the best roof box for your needs.
Need Some Help Working out the Differences Between Roof Boxes
Roof Box Fit & Buying Guide (UK) – Choose the Right Roof Box for Your Car
A roof box is one of the easiest ways to add secure storage to your vehicle without sacrificing passenger comfort. The key is choosing a box that suits your luggage, your journeys, and—most importantly—your vehicle + roof bars.
This guide explains what to look for, how to avoid common fitment mistakes, and how to choose a roof box that feels quiet, stable and easy to live with.
Quick start: match by vehicle first
The safest way to buy a roof box is to start with compatibility: your car’s roof type, bar spacing and roof load limit. If you already have roof bars, you’ll want a box that fits your bar width and mounting system.
Shop roof boxes Shop roof bar1) Choose the right roof box size
Roof box size is usually measured in litres. Bigger isn’t always better—an oversized box can affect boot clearance, noise and ease of handling. Use the guide below as a quick starting point:
| Size band | Typical capacity | Best for | Common vehicle types |
|---|---|---|---|
| Small | ~300–350L | Weekend bags, compact gear, 1–2 people | Hatchbacks, small crossovers |
| Medium | ~350–450L | Family luggage, mixed gear, frequent UK trips | Hatchbacks, saloons, estates, SUVs |
| Large / XL | ~450L+ | Long journeys, bulky luggage, camping kit, winter gear | Estates, SUVs, vans (with suitable bars) |
2) Compatibility: the part most people miss
Roof bars matter
Roof boxes mount to roof bars, not directly to the roof. The box must suit your bar type (aero/wing, square, etc.), bar width, and mounting style.
- Bar spacing (front-to-rear distance)
- Bar width/thickness (clamp clearance)
- Roof type (rails / fixed points / flush rails)
Boot clearance & tailgate opening
On many cars, a long roof box can limit boot opening. This is common on hatchbacks and some SUVs. A slightly shorter box can be easier to use day to day while still providing lots of space.
Tip: if you often access the boot on trips, prioritise a box shape/length that preserves tailgate clearance.
3) What are you carrying?
Roof boxes are ideal for bulky, lightweight items. For best stability, keep heavier items inside the vehicle where possible.
Common use cases
- Family holidays: suitcases, soft bags, prams
- Outdoor trips: camping kit, chairs, sleeping bags
- Winter gear: skis/snowboards (check internal length)
- Every day overflow: sports bags, bulky shopping
Internal length (often overlooked)
If you’re carrying skis, poles or longer gear, the internal length matters more than litres. Some boxes are high-volume but not long enough for certain equipment.4) Aerodynamics, noise & fuel efficiency
Aerodynamic roof boxes typically sit lower and taper towards the rear to reduce wind drag and motorway noise. If you do lots of motorway miles, an aerodynamic design can feel noticeably quieter and more efficient.
5) Safety: roof load limits and sensible packing
Every vehicle has a maximum roof load limit (often 50–100kg). This limit includes: roof bars + roof box + contents.
- Check your vehicle roof load limit in the handbook
- Keep heavier items low and central (preferably inside the car)
- Evenly distribute weight in the roof box
- Re-check clamp tightness after the first 10–20 miles
Driving tip: Allow a little extra braking distance and take corners smoothly when loaded.
FAQ
Do roof boxes fit all cars?
Not automatically. A roof box must be compatible with your roof bars and your vehicle’s roof load limit. The best route is to match your roof bars to your car first, then choose a box that fits those bars.
Will a roof box damage my roof?
When correctly installed on compatible roof bars and within the roof load limit, a roof box should not damage the roof. Issues usually come from incorrect fitting, overtightening, or exceeding weight limits.
How much can I put in a roof box?
Use your vehicle roof load limit as the starting point, then subtract the weight of your roof bars and the box itself. Pack lighter, bulkier items in the box where possible.
Does a roof box increase fuel consumption?
Yes—any roof load increases drag. Aerodynamic boxes help reduce the impact, and removing the box when not needed can make a noticeable difference.
Ready to choose your roof box?
If you want a quick, correct setup, start with the right roof bars for your vehicle and then select a roof box that matches your bars and travel needs.