The TGD B 2024 Volume 1 Reprinted Edition is now available. Published by the Department of Housing, Local Government and Heritage in January 2026, this corrected version of TGD B 2024 Volume 1 incorporates 37 amendments addressing errors, omissions, and clarifications discovered since the original publication.

This guide provides a complete breakdown of every correction, with practical checks and validation steps to help you assess the impact on live projects.

Immediate Action Required

If you have projects currently in design or certification that reference the original TGD B 2024 Volume 1, review them against the high-priority changes below. Several corrections can materially affect compliance outcomes.

Highest-Impact TGD B 2024 Volume 1 Changes

If you need to triage rather than review every amendment, these are the corrections most likely to alter compliance outcomes in live projects:

TGD B 2024 Volume 1 Priority Review List

Table 3: Single-direction travel for offices/shops now 18m (p.54) — This value was completely missing from the original. Can trigger extra exits or layout changes. Next step: Re-measure worst-case single-direction routes and record pass/fail against 18m.
Diagram 58: Atrium height corrected to 18m max for flats (p.204) — Original diagram showed 30m; text always said 18m. This is the most material diagram correction. Next step: Confirm any atrium design route remains within the corrected 18m limit.
Para 1.9.3.2(a): Panic hardware threshold changes (p.133) — Now >60 people for PG 4(a), 4(b), 5(a)(ii); retained at >50 for other PG 5. Next step: Reconcile occupancy calculations with door schedules; document which doors require panic hardware.
Para 1.6.6.3.2(d): New corridor measurement rules for flats (p.111) — Adds travel distance measurement point and lobby direct access constraints. Next step: Check corridor lengths from furthest flat entrance to protected stair or lobby door.
Table 31: Scope expanded to protected corridors for electrical DBs (p.319) — Enclosure requirements now explicitly apply to protected corridors, not just protected stairways. Next step: Audit DB locations in protected corridors; confirm enclosure FR and access arrangements.
Appendix H: Purpose Group narrowed to 2(a)(ii) (p.355) — Summary table triggers now apply specifically to sub-type 2(a)(ii), not all 2(a). Next step: Confirm building's purpose group sub-classification before applying Appendix H triggers.

TGD B 2024 Volume 1 Means of Escape Amendments

Amendment 2: Table 3 Travel Distance

PDF Page 54 | Section: Para 1.4.2.2 – Limitations on Travel Distances

Original: 3, 4(a) Offices, Shop [blank] 45 — also showed: 2(a) for care facilities. Reprinted Edition: 3, 4(a) Offices, Shop 18 45 — now shows: 2(a)(ii) for care facilities.

Practical check: Re-run travel distance compliance for office/shop layouts where a single-direction condition exists.

Amendment 5: Compartment Wall Exception

PDF Page 47 | Section: Para 1.4.5.6 – Bedrooms in Residential Care Facilities

Original: "…sprinkler system in accordance with Section 8." Reprinted Edition: "…Section 8, however, this exception does not apply to a compartment wall."

Practical check: Where you relied on that exception at a compartment wall, it is now explicitly disallowed.

Amendment 6: Protected Lobby Logic

PDF Page 50 | Section: Para 1.4.8.1.1 – Means of Escape from Stage Areas. Original: "Protected lobbies should be provided between: (a)… or (b)… or…" Reprinted Edition: "Protected lobbies should be provided in each of the following situations; between:…" Practical check: Avoid treating (a)-(d) as mutually exclusive options.

Amendments 11 & 12: "Or" to "And"

PDF Pages 90-92 | Sections: Para 1.5.8.3(b) and Para 1.5.9(b). Both amendments change "or" to "and" between subclauses, making conditions cumulative rather than alternative. Practical check: Review designs where you justified compliance by meeting only one of multiple conditions.

Amendment 17: New Corridor Rules

PDF Page 111 | Section: Para 1.6.6.3.2 – Single direction of travel (Flats). New Text Added: "(d) Travel distance within any common corridor should be measured from the furthest entrance door to a flat to the protected stair, or lobby door…" Practical check: Re-check blocks of flats where long common corridors exist.

Amendment 20: Panic Hardware

PDF Page 133 | Section: Para 1.9.3.2(a) – Doors in Buildings with Large Numbers of People. Original: "…more than 50 people…" Reprinted Edition: "…more than 60 people for PG 4(a), 4(b), 5(a)(ii); 50 people for other PG 5…" Practical check: Review occupancy loads and document which doors require panic hardware.

TGD B 2024 Volume 1 Internal Fire Spread Amendments

Amendment 25: Diagram 58 Atrium Correction

PDF Page 204 | Section: Section 3 – Atria in Buildings Containing Flats. Original: Diagram 58 showed 30m (max.) for atrium height in flats. Reprinted Edition: Diagram 58 now shows 18m (max.) for atrium height in flats.

Major Correction: This is the most material diagram correction in the TGD B 2024 Volume 1 Reprinted Edition. The original diagram conflicted with the text, which always stated "up to 18m". If an atrium design route was based on the 30m depiction, it may be non-compliant.

Complete TGD B 2024 Volume 1 Amendment Register

The following table provides a complete reference for all 37 amendments with their locations and risk classifications.

Amd 1 | Part B12, p.26 | "system(s)" → "active fire safety systems" | Medium
Amd 2 | Table 3, p.54 | 18m single-direction added for offices/shops; 2(a)→2(a)(ii) | High
Amd 3 | Para 1.4.5.1, p.46 | "shopping centres" → "residential (care facility)" | Medium
Amd 4 | Para 1.4.5.6(b), p.47 | Removes stray "(a)" reference | Low
Amd 5 | Para 1.4.5.6, p.47 | Adds compartment wall exception exclusion | High
Amd 6 | Para 1.4.8.1.1, p.50 | Removes "or" making protected lobby list cumulative | High
Amd 7 | Para 1.4.8.1.3, p.51 | Adds I.S. EN 13501-1 classification reference | Low
Amd 8 | Para 1.4.9, p.58 | Removes reference to Para 1.6.7.1 | Medium
Amd 9 | Para 1.4.9(i), p.58 | Inserts "most remote" before "dead end" | Medium
Amd 10 | Para 1.5.6.5, p.75 | Adds "or in a circulation space" for battery storage | Medium
Amd 11 | Para 1.5.8.3(b), p.92 | "or" → "and" (cumulative door clearance conditions) | High
Amd 12 | Para 1.5.9(b), p.90 | "or" → "and" (cumulative external wall conditions) | High
Amd 13 | Para 1.6.2.2.1(d), p.102 | Corrects diagram references to 8(a), 8(b), 8(c) | Low
Amd 14 | Diagrams 18 & 20 | Graphics updated and clarified | Low
Amd 15 | Para 1.6.2.3.5, p.99 | "corridor" → "hallway" terminology | Low
Amd 16 | Para 1.6.2.4(b), p.102 | Removes "or rescue" from escape window reference | Medium
Amd 17 | Para 1.6.6.3.2, p.111 | New clause (d) for corridor measurement and lobby rules | High
Amd 18 | Para 1.7.5.1, p.126 | "Subsection 1.5" → "Subsection 1.4" | Low
Amd 19 | Paras 1.9.3.1.2/1.9.3.1.3, p.133 | Adds "(see Appendix B, B5.2)" after I.S. EN 13637 | Low
Amd 20 | Para 1.9.3.2(a), p.133 | Panic hardware: 50→60 for PG 4/5(a)(ii), 50 retained for other PG 5 | High
Amd 21 | Para 1.9.14.5, p.148 | "where one exists" → "where one has been provided" | Low
Amd 22 | Table 15 Note (1), p.169 | "Para 3.5.4" → "Para 3.4.4" | Low
Amd 23 | Para 3.4.4.7(e), p.172 | Adds "in a building containing flats (Purpose Group 1(c))" | Medium
Amd 24 | Para 3.5.10, p.176 | Subclause references: "(a) and (b)" → "(b) and (c)" | Medium
Amd 25 | Diagrams 45-49, 58, 59 | Multiple diagrams updated; Diagram 58: 30m→18m for flats atria | High
Amd 26 | Table 19, p.215 | Deletes Note (6) references | Medium
Amd 27 | Diagram 66, p.222 | "Para 4.4.5.1" → "Para 4.4.3.1" | Low
Amd 28 | Para 4.4.6.1, p.225 | Adds "or protractor method" for BR 187 | Low
Amd 29 | Table 21, p.227 | Adds "7(c)" to Column (b) purpose groups | Medium
Amd 30 | Para 5.4.2.1, p.240 | "Table 25" → "Table 24" | Low
Amd 31 | Para 5.5.6.3(f), p.248 | "openable" → "operated" | Medium
Amd 32 | Para 6.10.2, p.278 | Renumbers subparagraphs: (b)(iii) becomes (c) | Low
Amd 33 | Subsection 8.2, p.302 | "Provision for" → "Provision of" Sprinkler Systems | Low
Amd 34 | Table 31 Item 11(d), p.319 | Adds "or protected corridor" for electrical DBs | High
Amd 35 | Appendix H, p.355 | Adds "(ii)" to PG 2(a) in Rows 2 and 7 | High
Amd 36 | Multiple pages | "Class" prefix standardisation for reaction-to-fire refs | Low
Amd 37 | Global | Editorial: spelling, spacing, punctuation, citations | Low

Recommended Actions for TGD B 2024 Volume 1 Compliance

Immediate project review — Check any current projects designed using the original TGD B 2024 Volume 1 against Amendments 2, 5, 6, 11, 12, 17, 20, 25, 34, and 35.
Travel distance verification — Re-measure worst-case single-direction routes in offices and shops against the 18m limit. Record pass/fail for each route.
Atrium design review — If any flat building atrium design relied on the 30m diagram depiction, re-evaluate against the corrected 18m limit.
Door hardware audit — Reconcile occupancy calculations with door schedules. Document which doors require panic hardware under the revised thresholds.
Document control update — Replace original TGD B 2024 Volume 1 copies with the Reprinted Edition. Cite by paragraph/table/diagram rather than page number to avoid citation drift.

Need Help with TGD B 2024 Volume 1 Changes?

Phoenix STS has updated all fire safety training materials and consultancy services to reflect the 37 corrections in the TGD B 2024 Volume 1 Reprinted Edition. Our CPD-accredited courses and fire risk assessment services now incorporate the revised requirements for travel distances, panic hardware thresholds, compartment walls, and all other amendments.

Whether you need team training, a project compliance review, or expert guidance on how these changes affect your buildings, we can help. Contact Phoenix STS

Disclaimer

This article is provided for general informational and educational purposes only. It does not constitute legal, regulatory, or professional fire safety advice. Building regulation requirements vary based on building type, occupancy, construction date, and local authority interpretation. Designers, building control officers, and fire safety professionals should consult the official TGD B 2024 Volume 1 Reprinted Edition and seek competent professional advice when making compliance decisions. Phoenix STS accepts no liability for actions taken based on this information without appropriate professional consultation.

About the Author

Paddy McDonnell is CEO of Phoenix STS and a Certified Member of the Institution of Occupational Safety and Health (IOSH). With extensive expertise in fire engineering and healthcare fire safety compliance, Paddy specialises in helping Irish nursing homes and designated centres meet HIQA Regulation 28 requirements. As a Fellow of the International Institute of Risk and Safety Management and Member of the National Fire Protection Association, Paddy delivers CPD-accredited training programmes and conducts fire risk assessments to PAS 79:2020 standard across Ireland.

His work focuses on practical, evidence-based solutions for healthcare facilities, particularly in nursing home fire safety management and emergency evacuation planning. Paddy is registered with the National Fire Risk Assessors Register (NFRAR) and contributes to advancing fire safety standards through professional development initiatives and industry collaboration.