Adding a patio, driveway or pool adds hard surface, and around a drinking-water reservoir that can matter. It is worth checking before design, not after.
What impervious surface means
Any surface that prevents water soaking into the ground: roofs, driveways, concrete, mortared stone, and conventional paving among them.
Instead of infiltrating, rain runs off these surfaces faster and in greater volume, carrying sediment and nutrients with it.
Jurisdictions in water supply watersheds often limit how much of a lot may be covered by impervious surface.
Lake Norman is a water supply reservoir, so lots in parts of Iredell, Lincoln and Mecklenburg counties can fall under watershed provisions.
Why it affects your project
A large patio, an expanded driveway, a pool deck and a shed all add up, and existing coverage counts toward the total.
Where a limit applies, exceeding it may require a different design, a smaller footprint, or engineered stormwater measures.
Some jurisdictions give partial credit for permeable paving; others do not. This varies and must be confirmed locally.
HOA rules can be stricter than the local ordinance, and both apply.
How to check
Contact the planning or stormwater department for the county or town the property sits in — they hold the applicable rules and can tell you whether your lot is in a regulated watershed area.
Have your parcel information and lot size to hand, plus a rough figure for existing hard surface.
Ask about permeable paving credit, limits, and whether your project triggers review.
Do this at the concept stage. Redesigning after approval is refused is expensive.
Designing within the limits
Right-size the patio to how you actually use it rather than paving by default. A well-planned smaller area often works better anyway.
Use gravel, stepping stones and planted areas for secondary spaces.
Manage runoff on site: rain gardens, dry wells and dispersal into planted areas reduce the impact of what you do build.
Southern Style Turf & Design designs hardscape and drainage together across the Lake Norman area and works with what your jurisdiction allows. Confirm the rules for your parcel with your county or town.
Frequently asked questions
Is there an impervious surface limit on my Lake Norman lot?
It depends on the jurisdiction and whether the lot is in a water supply watershed area. Your county or town planning office can confirm.
Do permeable pavers count as impervious?
Some jurisdictions give partial credit and others do not. Confirm locally before relying on it in a design.
Does a patio require stormwater review?
Sometimes, depending on size, location and local rules. Check at the concept stage rather than after ordering materials.
Want this looked at on your property?
We give free, no-pressure on-site estimates across Denver, Mooresville, Cornelius, Davidson, Huntersville and Troutman.
