Google Answers Logo
View Question
Q: Residentian Building codes in St Paul MN ( Answered 5 out of 5 stars,   0 Comments )
Subject: Residentian Building codes in St Paul MN
Category: Reference, Education and News > Consumer Information
Asked by: shawanda5-ga
List Price: $15.00
Posted: 27 Feb 2006 08:50 PST
Expires: 29 Mar 2006 08:50 PST
Question ID: 701481
What is residential building code for interior stairs in Saint Paul, MN?
Specifically the allowable variations in riser heights.
Subject: Re: Residentian Building codes in St Paul MN
Answered By: scriptor-ga on 27 Feb 2006 09:58 PST
Rated:5 out of 5 stars
Dear shawanda5,

The Minnesota State Building Code applies to residential buildings in
Saint Paul. In particular, 1309.0314 Section R314, which is hereby
quoted in full:

R314.1 Width.  Stairways shall not be less than 36 inches (914 
 mm) in clear width at all points above the permitted handrail 
 height and below the required headroom height.  Handrails shall 
 not project more than 4.5 inches (114 mm) on either side of the 
 stairway and the minimum clear width of the stairway at and 
 below the handrail height, including treads and landings, shall 
 not be less than 31.5 inches (787 mm) where a handrail is 
 installed on one side and 27 inches (698 mm) where handrails are 
 provided on both sides. 

    Exception:  The width of spiral stairways shall be in 
    accordance with Section R314.5. 

 R314.2 Treads and risers.  The maximum riser height shall be 8 
 inches (203 mm) and the minimum tread depth shall be 9 inches 
 (228 mm).  The riser height shall be measured vertically between 
 leading edges of the adjacent treads.  The tread depth shall be 
 measured horizontally between the vertical planes of the 
 foremost projection of adjacent treads and at a right angle to 
 the tread's leading edge.  The walking surface of treads and 
 landings of a stairway shall be sloped no steeper than one unit 
 vertical in 48 units horizontal (2-percent slope).  The greatest 
 riser height within any flight of stairs shall not exceed the 
 smallest by more than 3/8 inch (9.5 mm).  The greatest tread 
 depth within any flight of stairs shall not exceed the smallest 
 by more than 3/8 inch (9.5 mm). 

 R314.2.1 Profile.  Open risers are permitted, provided that the 
 opening between treads does not permit the passage of a 4 inch 
 diameter (102 mm) sphere. 

 R314.3 Headroom.  The minimum headroom in all parts of the 
 stairway shall not be less than 6 feet, 8 inches (2032 mm) 
 measured vertically from the sloped plane adjoining the tread 
 nosing or from the floor surface of the landing or platform. 

 R314.4 Winders.  Winders are permitted, provided that the width 
 of the tread at a point not more than 12 inches (305 mm) from 
 the side where the treads are narrower is not less than 9 inches 
 (228 mm) and the minimum width of any tread is not less than 6 
 inches (152 mm).  The continuous handrail required by Section 
 R315.1 shall be located on the side where the tread is narrower. 

 R314.5 Spiral stairs.  Spiral stairways are permitted, provided 
 the minimum width shall be 26 inches (660 mm) with each tread 
 having a 7-1/2 inch (190 mm) minimum tread width at 12 inches 
 (305 mm) from the narrow edge.  All treads shall be identical, 
 and the rise shall be no more than 9-1/2 inches (214 mm).  A 
 minimum headroom of 6 feet, 6 inches (1982 mm) shall be provided.

 R314.6 Circular stairways.  Circular stairways shall have a 
 tread depth at a point not more than 12 inches (305 mm) from the 
 side where the treads are narrower of not less than 10 inches 
 (254 mm) and the minimum depth of any tread shall not be less 
 than 6 inches (152 mm).  Tread depth at any walking line, 
 measured a consistent distance from a side of the stairway, 
 shall be uniform as specified in Section R314.2. 

 R314.7 Illumination.  All stairs shall be provided with 
 illumination in accordance with Section R303.4.  

 R314.8 Under stair protection.  Enclosed accessible space under 
 stairs shall have walls, under stair surface, and any soffits 
 protected on the enclosed side with 1/2-inch (12.7 mm) gypsum 

 R314.9 Bulkhead enclosure stairways.  Stairways serving bulkhead 
 enclosures that are not part of the required building egress and 
 providing access from the outside grade level to the basement 
 shall be exempt from the requirements of Sections R312, R314, 
 and R315 when the maximum height from the basement finished 
 floor level to grade adjacent to the stairway is covered by a 
 bulkhead enclosure with hinged doors or other approved means.

Hope this is what you needed to know!


Minnesota Office of the Revisor of Statutes: Minnesota Rules, Chapter 1309

Minnesota Department of Labor and Industry: Minnesota State Building Code
shawanda5-ga rated this answer:5 out of 5 stars

There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  

Google Home - Answers FAQ - Terms of Service - Privacy Policy