TGD B 2024 Volume 1 Reprinted Edition: Complete Guide to All 37 Corrections
Key Takeaways: TGD B 2024 Volume 1 Reprinted Edition
- 37 amendments incorporated into the TGD B 2024 Volume 1 Reprinted Edition (January 2026)
- Table 3 critical fix: 18m single-direction travel distance for offices and shops was completely missing from the original
- Diagram 58 major correction: Atrium height changed from 30m to 18m for flats, potentially invalidating existing designs
- Panic hardware thresholds: Now 60 people for PG 4 and 5(a)(ii), retained at 50 for other PG 5 buildings
- Compartment wall clarification: Sprinkler exceptions explicitly do not apply to compartment walls
- New measurement guidance: Para 1.6.6.3.2(d) adds corridor travel distance and lobby arrangement rules for flats
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
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1
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.
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2
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.
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3
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.
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4
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.
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5
Table 31: Scope expanded to protected corridors for electrical DBs (p.319)
Enclosure requirements now explicitly apply to protected corridors, not just protected stairways.
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6
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).
TGD B 2024 Volume 1 Means of Escape Amendments
Section: Para 1.4.2.2 – Limitations on Travel Distances
3, 4(a) Offices, Shop [blank] 45Also showed:
2(a) for care facilities
3, 4(a) Offices, Shop 18 45Now shows:
2(a)(ii) for care facilities
Section: Para 1.4.5.6 – Bedrooms in Residential Care Facilities
Section: Para 1.4.8.1.1 – Means of Escape from Stage Areas
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.
Section: Para 1.6.6.3.2 – Single direction of travel (Flats)
Section: Para 1.9.3.2(a) – Doors in Buildings with Large Numbers of People
TGD B 2024 Volume 1 Internal Fire Spread Amendments
Section: Section 3 – Atria in Buildings Containing 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 | Location | Change Summary | Risk |
|---|---|---|---|
| 1 | Part B12, p.26 | “system(s)” → “active fire safety systems” | Medium |
| 2 | Table 3, p.54 | 18m single-direction added for offices/shops; 2(a)→2(a)(ii) | High |
| 3 | Para 1.4.5.1, p.46 | “shopping centres” → “residential (care facility)” | Medium |
| 4 | Para 1.4.5.6(b), p.47 | Removes stray “(a)” reference | Low |
| 5 | Para 1.4.5.6, p.47 | Adds compartment wall exception exclusion | High |
| 6 | Para 1.4.8.1.1, p.50 | Removes “or” making protected lobby list cumulative | High |
| 7 | Para 1.4.8.1.3, p.51 | Adds I.S. EN 13501-1 classification reference | Low |
| 8 | Para 1.4.9, p.58 | Removes reference to Para 1.6.7.1 | Medium |
| 9 | Para 1.4.9(i), p.58 | Inserts “most remote” before “dead end” | Medium |
| 10 | Para 1.5.6.5, p.75 | Adds “or in a circulation space” for battery storage | Medium |
| 11 | Para 1.5.8.3(b), p.92 | “or” → “and” (cumulative door clearance conditions) | High |
| 12 | Para 1.5.9(b), p.90 | “or” → “and” (cumulative external wall conditions) | High |
| 13 | Para 1.6.2.2.1(d), p.102 | Corrects diagram references to 8(a), 8(b), 8(c) | Low |
| 14 | Diagrams 18 & 20 | Graphics updated and clarified | Low |
| 15 | Para 1.6.2.3.5, p.99 | “corridor” → “hallway” terminology | Low |
| 16 | Para 1.6.2.4(b), p.102 | Removes “or rescue” from escape window reference | Medium |
| 17 | Para 1.6.6.3.2, p.111 | New clause (d) for corridor measurement and lobby rules | High |
| 18 | Para 1.7.5.1, p.126 | “Subsection 1.5” → “Subsection 1.4” | Low |
| 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 |
| 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 |
| 21 | Para 1.9.14.5, p.148 | “where one exists” → “where one has been provided” | Low |
| 22 | Table 15 Note (1), p.169 | “Para 3.5.4” → “Para 3.4.4” | Low |
| 23 | Para 3.4.4.7(e), p.172 | Adds “in a building containing flats (Purpose Group 1(c))” | Medium |
| 24 | Para 3.5.10, p.176 | Subclause references: “(a) and (b)” → “(b) and (c)” | Medium |
| 25 | Diagrams 45-49, 58, 59 | Multiple diagrams updated; Diagram 58: 30m→18m for flats atria | High |
| 26 | Table 19, p.215 | Deletes Note (6) references | Medium |
| 27 | Diagram 66, p.222 | “Para 4.4.5.1” → “Para 4.4.3.1” | Low |
| 28 | Para 4.4.6.1, p.225 | Adds “or protractor method” for BR 187 | Low |
| 29 | Table 21, p.227 | Adds “7(c)” to Column (b) purpose groups | Medium |
| 30 | Para 5.4.2.1, p.240 | “Table 25” → “Table 24” | Low |
| 31 | Para 5.5.6.3(f), p.248 | “openable” → “operated” | Medium |
| 32 | Para 6.10.2, p.278 | Renumbers subparagraphs: (b)(iii) becomes (c) | Low |
| 33 | Subsection 8.2, p.302 | “Provision for” → “Provision of” Sprinkler Systems | Low |
| 34 | Table 31 Item 11(d), p.319 | Adds “or protected corridor” for electrical DBs | High |
| 35 | Appendix H, p.355 | Adds “(ii)” to PG 2(a) in Rows 2 and 7 | High |
| 36 | Multiple pages | “Class” prefix standardisation for reaction-to-fire refs | Low |
| 37 | Global | Editorial: spelling, spacing, punctuation, citations | Low |
Recommended Actions for TGD B 2024 Volume 1 Compliance
What to Do Next
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.
Re-measure worst-case single-direction routes in offices and shops against the 18m limit. Record pass/fail for each route.
If any flat building atrium design relied on the 30m diagram depiction, re-evaluate against the corrected 18m limit.
Reconcile occupancy calculations with door schedules. Document which doors require panic hardware under the revised thresholds.
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 STSDisclaimer
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.
