You can pour concrete over asphalt if it’s in good condition, thick, stable, and well-compacted. Concrete is more durable than asphalt and can extend the lifetime of your driveway without having to pay frequent asphalt driveway repair costs or replace it completely. 

But this is best reserved as a temporary solution based on budget restraints, as asphalt requires more frequent repairs and assessments than concrete. Once that concrete top is poured, it’ll be harder to accurately understand what’s happening beneath that layer, which could lead to more issues.

Yes, hardscaping is generally a great investment that can increase your home's value. Hardscape features improve your yard's functionality, safety, and aesthetics, which boosts curb appeal and overall property value. According to a survey by the National Association of Realtors and the National Association of Landscape Professionals, hardscape upgrades are one of the top four outdoor projects that add value to a property for resale, along with landscape upgrades, landscape management, and lawn care services. While most buyers see value in these features, some may be concerned about potential increases in property taxes or the cost to alter them later. However, the return on investment is typically excellent. For best results, hardscaping should be combined with professional landscaping, and it's wise to hire a reliable contractor for installation.

Building a road on a slope requires careful planning and will normally require a drainage system underneath to prevent flooding and damage to the road over time. Your professional may lengthen your road to create switchbacks if the slope directly to your home is too steep, as there are regulations for maximum road slope. The drainage system will help prevent runoff from the higher side of the slope from damaging the asphalt or concrete. Keep in mind that building a road on a slope isn’t a good DIY project, as a lot can go wrong.

The answer to whether or not you need to get a permit before you start your driveway can vary widely based on local ordinances and the scope of your driveway ideas. In most urban and suburban areas, a permit is needed before building a new driveway to ensure that a homeowner is using safe materials and proper drainage practices while designing and constructing a new driveway. In some rural areas, a homeowner may not be required to apply for a permit. When building a new driveway on your own, always check with your local building department to see if you need to request a permit. When hiring a driveway contractor, verify that the right permits are being used before driveway construction begins.