Retaining Walls: Oak Park vs Skokie

Do I need a permit for a retaining wall in Oak Park?

Retaining walls over 4 feet in height require a building permit. Shorter walls may also require permits if they support a surcharge such as a driveway or slope above. Contact the Building Department at (708) 358-5440 to confirm requirements for your project.

Do I need an engineer for my retaining wall?

Retaining walls over 4 feet tall typically require engineered structural drawings prepared by a licensed professional engineer. The Building Department will inform you during the permit review if engineering is required.

Can my retaining wall direct water onto my neighbor's property?

No. All retaining walls must include proper drainage provisions and may not redirect stormwater or groundwater onto neighboring properties. This is reviewed as part of the permit process.

Do I need a permit for a retaining wall in Skokie?

Yes if the wall is over 4 feet tall (measured from bottom of footing) or supports a surcharge load. Smaller decorative walls without surcharge may not require a permit but must meet drainage rules.

Do I need an engineer for my retaining wall in Skokie?

Yes for any wall over 4 feet. A licensed Illinois structural engineer must seal the drawings submitted with your permit application.

Can my retaining wall change drainage onto my neighbor?

No. Walls must not redirect stormwater onto adjoining properties. Drainage calculations may be required as part of the permit review.