Professional installers often include a deep layer of crushed gravel under permeable pavers to allow more runoff to soak through into the soil below. Many installations will include multiple layers of gravel, with coarser aggregate at the base and finer aggregate that sits on top of that bottom layer. Above the gravel, you’ll often find coarse sand that helps reduce paver shifting over time. Some permeable paver designs include a water collection system set into the gravel layer to route runoff to a safe area for disposal.

In most cases, you don’t need a permit to repave your driveway, although some exceptions exist. If you’re widening your driveway and plan on widening the apron as well, you’ll usually need a permit from the Department of Transportation in your area. This permit costs between $50 and $300 in most cases. Most municipalities will also require a certified and insured contractor do the work relating to the apron and curb cut. You can contact your building department or ask your paving company if you need a permit. Your driveway professional will usually pull the permit for you.

Driveways should be sloped with a minimum 2% slope—anything lower will cause precipitation and runoff to collect. A 2% slope is the equivalent of a 2-foot rise over 100 feet. One quick way to check the integrity of your driveway’s slope: no more than four inches of water should collect on the surface longer than 15 minutes after rain.

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.