Building Codes by Topic
Find calculation guides, web tools and printable references by task, alongside country-specific building-code guidance.
Choose your task. Calculation guides explain the maths; expand a country to find its building-code guidance. Requirements can depend on the building class, adopted edition and local amendments.
Stairs & barriers
Risers, goings, landings and guarding.
Calculation guides
Calculate stair geometry Get the printable worksheet
Building-code guidance by country
Australia 5 guides
United States 2 guides
New Zealand 1 guide
United Kingdom 2 guides
Canada 1 guide
France 1 guide
Germany 1 guide
Indonesia 1 guide
Japan 1 guide
Timber framing
Spacing calculations and the inputs to check against your framing design.
Calculation guides
Building-code guidance by country
Australia 7 guides
- AS 1684 Span Tables Explained: Start with the Inputs
- Wind Classification: The Input Your Frame Needs
- Floor Joist Spans: What Determines the Answer
- Rafter Spans and Roof Members: Geometry Is Only the Start
- MGP10 vs MGP12: Grade Is One Part of the Specification
- Stud Spacing: Start with the Wall Design
- Construction Timbers in Queensland: Check the Species Requirement
Roofing
Pitch, roof geometry and water drainage.
Calculation guides
Convert a gradient Get the printable worksheet
Building-code guidance by country
Australia 3 guides
New Zealand 1 guide
United Kingdom 1 guide
Ireland 1 guide
Spain 1 guide
Norway 1 guide
Footings & slabs
Site conditions, footing design and quantities.
Calculation guides
- Concrete Calculations: The Complete On-Site Guide
- How to Calculate Concrete Volume for a Slab
- Concrete for Post Holes: Volume Per Hole & Bags Needed
- How Many Bags of Concrete Per m³? (20kg, 25kg, 40kg)
- Concrete Mix Ratios Explained: 1:2:3, 1:2:4 & Water-Cement Ratio
- Gravel & Base Volume: Compacted Depth vs Loose-Fill Order Quantity
Estimate concrete quantity Get the printable worksheet
Building-code guidance by country
Australia 1 guide
United States 1 guide
New Zealand 1 guide
United Kingdom 1 guide
Canada 1 guide
Ireland 1 guide
France 1 guide
Germany 1 guide
Indonesia 1 guide
Waterproofing
Wet-area details and jurisdiction-specific requirements.
Calculation guides
Convert a gradient Get the printable worksheet
Building-code guidance by country
Australia 2 guides
United States 1 guide
New Zealand 1 guide
United Kingdom 1 guide
Canada 1 guide
Ireland 1 guide
Germany 1 guide
Indonesia 1 guide
Norway 1 guide
Ramps & access
Gradients, landings and access requirements.
Calculation guides
Convert a gradient Get the printable worksheet
Building-code guidance by country
Australia 1 guide
United States 1 guide
New Zealand 1 guide
United Kingdom 1 guide
Canada 1 guide
Ireland 1 guide
France 1 guide
Germany 1 guide
Indonesia 1 guide
Japan 1 guide
India 1 guide
Norway 1 guide
Room heights
Ceiling-height rules and their scope.