# Irish Building Regulations: One National Rule Book Ireland runs a single set of Building Regulations with Technical Guidance Documents (TGDs) as the deemed-to-satisfy route — alongside project-specific planning and site requirements. Here are the rules and the calculators that solve them. - Canonical HTML: https://www.chippy.tools/building-codes/ie/ - Publisher: Chippy Tools - Language: en - Updated: 2026-09-21 [Browse all topics](https://www.chippy.tools/building-codes/topics/)[Free web tools](https://www.chippy.tools/building-codes/tools/)[Printable references](https://www.chippy.tools/building-codes/printables/) [All countries](https://www.chippy.tools/building-codes/) [Ireland](https://www.chippy.tools/building-codes/ie/) Topics Stairs - [Irish Stair & Barrier Rules: Rise, Going, Handrails, Guarding](https://www.chippy.tools/building-codes/ie/stairs/stair-and-barrier-requirements/) Roofing - [Irish Roof Pitch: Product, Exposure and Design Checks](https://www.chippy.tools/building-codes/ie/roofing/minimum-roof-pitch/) Footings - [Irish Strip Foundations: Widths, Depth & Concrete (TGD A)](https://www.chippy.tools/building-codes/ie/footings/footing-sizes-and-depth/) Room heights - [Does Ireland Have a Minimum Ceiling Height?](https://www.chippy.tools/building-codes/ie/rooms/minimum-ceiling-heights/) Ramps - [Irish Dwelling Ramp Gradients: TGD M Approach Rules](https://www.chippy.tools/building-codes/ie/ramps/ramp-gradients/) Wet areas - [Irish Wet-Room Waterproofing: System and Project Checks](https://www.chippy.tools/building-codes/ie/wet-areas/waterproofing-requirements/) Calculation guides - [Concrete Calculations: The Complete On-Site Guide](https://www.chippy.tools/building-codes/concrete/concrete-calculations-guide/) - [How to Calculate Concrete Volume for a Slab](https://www.chippy.tools/building-codes/concrete/concrete-volume-slab/) - [How Many Bags of Concrete Per m³? (20kg, 25kg, 40kg)](https://www.chippy.tools/building-codes/concrete/bags-of-concrete-per-m3/) - [Concrete for Post Holes: Volume Per Hole & Bags Needed](https://www.chippy.tools/building-codes/concrete/concrete-post-holes/) - [Concrete Mix Ratios Explained: 1:2:3, 1:2:4 & Water-Cement Ratio](https://www.chippy.tools/building-codes/concrete/concrete-mix-ratios/) - [Roof Pitch to Angle: Convert Rise/Run to Degrees & Grade](https://www.chippy.tools/building-codes/concrete/roof-pitch-to-angle/) - [Rafter Length Calculation: Run, Rise & Overhang](https://www.chippy.tools/building-codes/concrete/rafter-length/) - [Stair Rise & Run Setout: Riser, Going & the 2R+G Formula](https://www.chippy.tools/building-codes/concrete/stair-rise-and-run-setout/) - [How to Convert a Fall or Gradient: Ratio, Percentage & Degrees](https://www.chippy.tools/building-codes/concrete/fall-and-gradient-conversion/) - [Stud & Joist Spacing Takeoff: How Many at 400, 450 & 600 mm Centres](https://www.chippy.tools/building-codes/concrete/stud-and-joist-spacing-takeoff/) - [Gravel & Base Volume: Compacted Depth vs Loose-Fill Order Quantity](https://www.chippy.tools/building-codes/concrete/gravel-and-base-volume/) In this section [Browse all topics](https://www.chippy.tools/building-codes/topics/)[Free web tools](https://www.chippy.tools/building-codes/tools/)[Printable references](https://www.chippy.tools/building-codes/printables/) [All countries](https://www.chippy.tools/building-codes/) [Ireland](https://www.chippy.tools/building-codes/ie/) Topics Stairs - [Irish Stair & Barrier Rules: Rise, Going, Handrails, Guarding](https://www.chippy.tools/building-codes/ie/stairs/stair-and-barrier-requirements/) Roofing - [Irish Roof Pitch: Product, Exposure and Design Checks](https://www.chippy.tools/building-codes/ie/roofing/minimum-roof-pitch/) Footings - [Irish Strip Foundations: Widths, Depth & Concrete (TGD A)](https://www.chippy.tools/building-codes/ie/footings/footing-sizes-and-depth/) Room heights - [Does Ireland Have a Minimum Ceiling Height?](https://www.chippy.tools/building-codes/ie/rooms/minimum-ceiling-heights/) Ramps - [Irish Dwelling Ramp Gradients: TGD M Approach Rules](https://www.chippy.tools/building-codes/ie/ramps/ramp-gradients/) Wet areas - [Irish Wet-Room Waterproofing: System and Project Checks](https://www.chippy.tools/building-codes/ie/wet-areas/waterproofing-requirements/) Calculation guides - [Concrete Calculations: The Complete On-Site Guide](https://www.chippy.tools/building-codes/concrete/concrete-calculations-guide/) - [How to Calculate Concrete Volume for a Slab](https://www.chippy.tools/building-codes/concrete/concrete-volume-slab/) - [How Many Bags of Concrete Per m³? (20kg, 25kg, 40kg)](https://www.chippy.tools/building-codes/concrete/bags-of-concrete-per-m3/) - [Concrete for Post Holes: Volume Per Hole & Bags Needed](https://www.chippy.tools/building-codes/concrete/concrete-post-holes/) - [Concrete Mix Ratios Explained: 1:2:3, 1:2:4 & Water-Cement Ratio](https://www.chippy.tools/building-codes/concrete/concrete-mix-ratios/) - [Roof Pitch to Angle: Convert Rise/Run to Degrees & Grade](https://www.chippy.tools/building-codes/concrete/roof-pitch-to-angle/) - [Rafter Length Calculation: Run, Rise & Overhang](https://www.chippy.tools/building-codes/concrete/rafter-length/) - [Stair Rise & Run Setout: Riser, Going & the 2R+G Formula](https://www.chippy.tools/building-codes/concrete/stair-rise-and-run-setout/) - [How to Convert a Fall or Gradient: Ratio, Percentage & Degrees](https://www.chippy.tools/building-codes/concrete/fall-and-gradient-conversion/) - [Stud & Joist Spacing Takeoff: How Many at 400, 450 & 600 mm Centres](https://www.chippy.tools/building-codes/concrete/stud-and-joist-spacing-takeoff/) - [Gravel & Base Volume: Compacted Depth vs Loose-Fill Order Quantity](https://www.chippy.tools/building-codes/concrete/gravel-and-base-volume/) [Building Codes](https://www.chippy.tools/building-codes/) Ireland # Irish Building Regulations: One National Rule Book Ireland builds to one national set of Building Regulations, explained in the Technical Guidance Documents (TGDs) — no regional variations to track. This hub carries the numbers from the TGDs and the calculators that solve them. ## Rules by topic Find guidance for the work you are doing, then confirm the requirements for your building and location. ### Stairs - [Irish Stair & Barrier Rules: Rise, Going, Handrails, Guarding](https://www.chippy.tools/building-codes/ie/stairs/stair-and-barrier-requirements/) ### Roofing - [Irish Roof Pitch: Product, Exposure and Design Checks](https://www.chippy.tools/building-codes/ie/roofing/minimum-roof-pitch/) ### Footings & slabs - [Irish Strip Foundations: Widths, Depth & Concrete (TGD A)](https://www.chippy.tools/building-codes/ie/footings/footing-sizes-and-depth/) ### Room heights - [Does Ireland Have a Minimum Ceiling Height?](https://www.chippy.tools/building-codes/ie/rooms/minimum-ceiling-heights/) ### Ramps - [Irish Dwelling Ramp Gradients: TGD M Approach Rules](https://www.chippy.tools/building-codes/ie/ramps/ramp-gradients/) ### Wet areas - [Irish Wet-Room Waterproofing: System and Project Checks](https://www.chippy.tools/building-codes/ie/wet-areas/waterproofing-requirements/) ## One rule book for the whole country Ireland has **one** set of Building Regulations, and they apply the length and breadth of the country. There is no county-by-county or council version — whether you’re building in Dublin, Cork or a one-off rural site, the same national Regulations apply. Every building control authority checks your job against the same rule book. The Building Regulations are made under the Building Control Act by the **Department of Housing, Local Government and Heritage**. They set out *what* a building has to do — stand up, keep people safe, keep the weather and damp out, ventilate properly — but the Regulations themselves mostly don’t carry the exact numbers. ## Where the numbers come from Most of the numbers a chippy sets out on site come from a **Technical Guidance Document**, or **TGD**. Each TGD is the Department’s guidance on how to meet one Part of the Regulations — Part K for stairs, ramps and guarding, Part A for structure, Part M for access, Part F for ventilation, and so on. Build to the guidance in a TGD and it’s treated as the **deemed-to-satisfy** route: it is evidence of compliance, subject to the scope and conditions of the guidance. A TGD is the standard path, but it is **not the only legal path**. A designer can instead show, by other means, that the actual requirement in the Regulations is met — an alternative design, backed by calculation or test. So treat the numbers on these pages as the normal, safe route, not the only one allowed. One more thing worth knowing before you rely on any figure: **the TGD edition in force can vary by the date a job was commenced or given permission**, and older editions of some TGDs still circulate online alongside the current one, with different numbers. Always confirm the current edition on [gov.ie](https://www.gov.ie/) before you sign off on a job. This page is general information for tradespeople and is not compliance, engineering or legal advice. Requirements are subject to state and territory variations and adoption timing. Always confirm requirements with your building certifier and relevant state authority. ## Page directory - [Does Ireland Have a Minimum Ceiling Height?](https://www.chippy.tools/building-codes/ie/rooms/minimum-ceiling-heights/index.md): Irish Building Regulations set no mandatory ceiling height, room area or daylight minimum. Here's what TGD Part F actually makes you hit — ventilation. - [Irish Dwelling Ramp Gradients: TGD M Approach Rules](https://www.chippy.tools/building-codes/ie/ramps/ramp-gradients/index.md): Use the dwelling approach rules in TGD M Section 3: up to 10 m at 1:15 and up to 5 m on steeper ramps, with landings and clear space. - [Irish Roof Pitch: Product, Exposure and Design Checks](https://www.chippy.tools/building-codes/ie/roofing/minimum-roof-pitch/index.md): Choose an Irish roof pitch from the specified system, exposure and design requirements. Check product limits, laps, fixings and applicable standards. - [Irish Stair & Barrier Rules: Rise, Going, Handrails, Guarding](https://www.chippy.tools/building-codes/ie/stairs/stair-and-barrier-requirements/index.md): The Irish Building Regulations numbers for a private stair — max rise 220 mm, min going 220 mm, 900 mm guarding — from the TGD Part K (2014) deemed-to-satisfy route. - [Irish Strip Foundations: Widths, Depth & Concrete (TGD A)](https://www.chippy.tools/building-codes/ie/footings/footing-sizes-and-depth/index.md): Why Ireland sets no fixed foundation depth, how strip-foundation width is read off a soil-and-load table, and the plain-concrete mix — from TGD Part A (2012). - [Irish Wet-Room Waterproofing: System and Project Checks](https://www.chippy.tools/building-codes/ie/wet-areas/waterproofing-requirements/index.md): Check the complete wet-room design, membrane, drain and product details for an Irish project. No single system or dimension suits every job.