ᐅ Slope at the driveway?

Hello everyone,

I have been in the planning phase for some time now and have an issue regarding the slope of my driveway.

I want to position my house 10 meters (33 feet) away from the road on the property. A rough initial measurement showed that the height difference over these 10 meters (33 feet) is about 2.5 meters (8 feet). Therefore, we plan to integrate our garage directly into the basement.

I have calculated that my driveway, which leads to the side entrance of the house, has a slope of about 28%.

2.8m (9.2 feet) ÷ 10m (33 feet) × 100 = 28%

I found a regulation online for garages stating that the maximum slope should not exceed 15%.

So my questions are:

- Is this maximum slope of 15% correct?
- If not, what would you consider comfortable and realistic?

Any information about the slope of your own driveways would be very helpful as well. Pictures are welcome.

Thank you very much for your help.

Calculate those 28% and then consider how you can conveniently access the garage.

Unimog achieves 100%

28% is steep but manageable if there is no snow. What is more important, however, is rounding off the transitions.

I would definitely not build with a slope of 18-20%. And if you have already calculated 28%, you also need to consider that with a sharp transition from 0% to 28% and back, even a true off-road vehicle would be pushed to its limits. Therefore, you need to smooth the transitions, which means the slope should actually be set even higher.

Conclusion: Don't do it.

You don’t need the 28% just for the sake of it, but because you don’t have any more space. Did you take turning radii into account in your calculation? Take a look at the approach angle of typical vehicles... I think this will cause problems.