Gutters

Downspout extension planning checklist

How homeowners can plan downspout extensions without guessing.

Short answer

Downspout extensions should move roof runoff away from problem areas without creating hazards for neighbors, walkways, foundations, septic areas, or erosion. Local site conditions matter.

Checklist

Home Drainage Planner

Use the downspout planning worksheet.

Preview the checklist pack

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Administrative and educational resource only. This guide is not inspection, engineering, legal, medical, or water-safety advice. Confirm local requirements and property-specific decisions with qualified professionals and official local agencies.