What are the stair riser and tread requirements?
In residential use, the maximum riser height is 7-3/4” and the minimum tread depth is 10”. Tread depth is measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the reads leading edge.

In commercial uses, maximum riser height is 7” and minimum tread depth is 11”.

There shall not be a variation exceeding 3/16” in the depth of adjacent treads or in height of adjacent risers. The tolerance between the largest and the smallest riser or the largest and smallest tread shall not exceed 3/8” in any flight of stairs.

The minimum headroom in all parts of a stairway shall not be less than 6’ 8” measured vertically from the tread nosing or from the floor surface of the landing or platform.

For winders, spiral, circular, and other types of stairs - call for requirements.

Stairway width and landing width for one and two family dwellings shall not be less than 3’.

Show All Answers

1. When is a Building Permit required?
2. What codes are in effect in the Town of Kennebunk?
3. How long is a permit valid?
4. Do I need a permit to put a shed on my property?
5. Do I need a permit for replacement windows and doors?
6. When is a handrail required?
7. What size does a bedroom egress window have to be?
8. What are the stair riser and tread requirements?
9. When is a guardrail required?
10. How much frost protection should I have?
11. What R-Values should I insulate to?
12. What are the ventilation requirements for a crawl space?
13. When is safety glazing required?