Stair Building Blog | Stairs Calculator

Floor plan comparison of L-shaped and U-shaped stair layouts

L-Shaped vs. U-Shaped Stairs: Which Layout Is Right for You?

Both turn a corner instead of running straight. The difference is a 90 degree turn versus a 180 degree turn, and that changes footprint, cost, and where the landing goes.

Diagram illustrating a floating stair structure

Design6 min read

Floating Stairs: How They Work, Cost, and Structural Basics

Floating treads look unsupported, but real engineering holds them up. Mono-stringer, cantilevered, and wall-mounted systems each solve the structural problem differently.

Building Codes5 min read

ADA Ramp vs. Stairs: When Do You Need a Ramp?

The ADA's default answer favors a ramp over stairs on an accessible route. Here is when a ramp is required, the maximum slope allowed, and when stairs alone are still acceptable.

Guides6 min read

How to Build Exterior Stairs That Meet Code

A contractor's complete guide to building code-compliant exterior stairs — from measuring total rise to cutting stringers, pouring footings, and installing railings that pass inspection.

Stair nosing projection dimension diagram

Building Codes5 min read

Stair Nosing Explained: What It Is and Why Code Requires It

Stair nosing is the small overhang at the front edge of a tread, and building code sets specific limits on how far it can project and how it has to be shaped.

Bar chart comparing per-step installed cost by stair material

Materials6 min read

How Much Does It Cost to Build Stairs? (Complete Price Guide)

Real stair-building costs by type and material, what drives the price, DIY vs. pro math, and five ways to save — with 2025–2026 prices and practical guidance.

Basement stair headroom minimum dimension diagram

Building Codes6 min read

Basement Stairs: Code Requirements and Design Tips

Basement stairs code follows the same rules as any other interior flight, plus a few extra considerations for low ceiling height and moisture. Here is what to plan for.

Attic access opening minimum dimension diagram

Building Codes6 min read

Attic Stairs: Code Requirements, Types, and Installation

Pull-down, fixed, or spiral: attic stairs code depends on whether the space counts as habitable. Here is the opening size code requires and how to pick the right stair type.

Guides7 min read

How to Build Concrete Steps: A Complete Guide

Learn how to build concrete steps the right way, from forming and rebar to the correct concrete mix strength and cure time.

Bar chart comparing OSHA, IRC, and ADA handrail height ranges

Building Codes5 min read

Stair Railing Height Codes: IRC vs. OSHA vs. ADA Compared

Three different codes set three overlapping handrail height ranges. Here is a side-by-side comparison so you know which number applies to your project.

ADA handrail height and extension dimension diagram

Building Codes6 min read

ADA Stair and Handrail Requirements Explained

ADA stair rules cover handrail height, extensions, grip diameter, and nosing, even though the ADA generally prefers an accessible route that avoids stairs. Here is what applies and why.

Comparison table of OSHA, IRC, and ADA handrail height limits

Building Codes6 min read

OSHA Stair and Ladder Requirements for the Workplace

OSHA's stairway rules differ from residential building codes in specific ways, including a rail height requirement that changed in 2017. Here is what applies to commercial and industrial stairs.

Labeled diagram of stair rise, run, tread, and riser

Guides7 min read

How to Calculate Stair Rise and Run (Step-by-Step Formula Guide)

Learn how to calculate stair rise and run with simple formulas, a worked example, and the code limits each number has to fall within.

Materials11 min read

Stair Materials Guide: Wood, Concrete, Metal, and Composite

Compare the pros, cons, and costs of popular stair building materials. From pressure-treated lumber for deck stairs to engineered hardwood for interior staircases, find the right material for your project.

Tips9 min read

Common Stair Building Mistakes and How to Avoid Them

Learn from the most frequent errors contractors and DIY builders make when constructing stairs, including uneven risers, incorrect stringer cuts, inadequate support, and code violations that fail inspection.

Comparison7 min read

Winder Stairs vs. Landing Stairs: Which Should You Choose?

Compare winder stairs and traditional landing stairs to determine which is better for your project. We cover space requirements, building code differences, construction complexity, and cost considerations.

Design10 min read

Spiral Staircase Design: Space-Saving Solutions for Small Homes

Explore the benefits and considerations of spiral staircases for residential use. Learn about diameter requirements, tread geometry, headroom calculations, and when spiral stairs are (and aren't) the right choice.

Building Codes8 min read

Understanding IRC Stair Codes: Rise, Run, and Headroom Requirements

A detailed breakdown of the International Residential Code (IRC) requirements for residential stairs including maximum riser height, minimum tread depth, headroom clearance, and handrail specifications.

Guides12 min read

How to Build Deck Stairs: A Complete Step-by-Step Guide

Learn the entire process of building deck stairs from planning and measuring to cutting stringers and installing treads. This comprehensive guide covers material selection, tools needed, and building code requirements.