Construction Guide · Twin Lakes, SC

Building Permits & Regulations in Twin Lakes, SC: What to Know Before You Break Ground

Twin Lakes sits on Johns Island, where City of Charleston and unincorporated Charleston County jurisdiction can be inconsistent parcel to parcel. Confirm your permitting authority before submitting plans, since it determines which floodplain and tree rules actually apply to your lot.

Floodplain Permits Require an Elevation Certificate

Work in a Special Flood Hazard Area requires a permit and an elevation certificate from a licensed surveyor, with new construction built at least 2 feet above Base Flood Elevation inside city limits. Confirm your parcel's flood zone before finalizing your design.

Tree Protection Rules Depend on Which Jurisdiction Applies

Both the city and county protect large-diameter trees, generally starting around 24 inches for single-family lots, though the exact thresholds and permitting process differ between the two. Confirm which ordinance governs your parcel before planning any tree removal.

Stormwater Review Has Been a Long-Running Issue on Johns Island

Johns Island has faced repeated scrutiny over drainage and fill-related flooding impacts on neighboring lots, prompting stricter stormwater review in recent years. Confirm your site's stormwater requirements with the appropriate jurisdiction before finalizing your site plan.

Planning a project in Twin Lakes and want your permitting confirmed before you break ground? Contact Chris Eller directly.