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While some areas may allow for a slope of up to 20%, this is often the maximum slope for driveways, with a few exceptions of up to 25%. Other regions may have a maximum of 12%, 15%, or 18%, so check with your local building department to ensure you’re laying a driveway that is up to code for your location.

Yes, most landscapers should be able to install French drains. However, it’s best to hire a French drain installation company that specializes in this type of project. You may want to get multiple quotes from landscaping companies to get an idea of the average installation cost before hiring a professional to install a French drain system for you.

For minor unevenness, you don't necessarily need to remove grass before leveling. You can apply a topdressing mixture to fill in low areas and even out the surface. However, for more significant unevenness or deep depressions, it might be necessary to temporarily remove the grass to ensure proper leveling and soil compaction. After filling and leveling, you can replace the grass or consider reseeding the area.

A perc test takes an average of around two hours, but it can range from one hour up to around six hours. Perc tests that require wider or deeper holes and those that require multiple holes dug throughout your property will take longer because there’s more excavation involved. The actual filling of the hole and monitoring to gauge the rate of percolation should take under an hour per hole.