| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | modified (prosp.) | Local Government (Wales) Act 1994 | 1994 c. 19 | s. 20(3) Sch. 5 Pt. 3 paras. 15(1) 20 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | amended | Environment Act 1995 | 1995 c. 25 | Sch. 9 para. 14(1) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | amended | The Environment Act 1995 (Consequential Amendments) Regulations 1996 | 1996 No. 593 | reg. 2 Sch. 1 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | transfer of powers in part (W) | The National Assembly for Wales (Transfer of Functions) Order 1999 | 1999 No. 672 | art. 2 Sch. 1 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | modified | Planning and Compulsory Purchase Act 2004 | 2004 c. 5 | s. 38 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | modified by SI 2010/675 Sch. 23 Pt. 8 para. 3 Table 9 (as substituted) | The Environmental Permitting (England and Wales) (Amendment) Regulations 2011 | 2011 No. 2043 | Sch. 1 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | applied in part (Isles of Scilly) (with modifications) | The Town and Country Planning (Isles of Scilly) Order 2013 | 2013 No. 2148 | art. 3 Sch. 1 | Yes |   Words “83, 84,” in 1990 c. 9, s. 92(2)(a) repealed (7.6.2006) by 2004 c. 5, Sch. 9; S.I. 2006/1281, art. 2(f)(iv) |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | applied (with modifications) | The Developments of National Significance (Wales) Regulations 2016 | 2016 No. 56 | Sch. 6 para. 1 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | modified | The Environmental Permitting (England and Wales) Regulations 2016 | 2016 No. 1154 | Sch. 23 Pt. 7 para. 1(3) 2 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | Act | power to amend conferred | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | s. 132 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 40 heading | words inserted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | s. 130(6)(a) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 1 | amended (prosp.) | Local Government (Wales) Act 1994 | 1994 c. 19 | s. 20(4) Sch. 6 Pt. 2 para. 26(1) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 1 | words inserted | Greater London Authority Act 2007 | 2007 c. 24 | s. 31(4) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(1) | amended (prosp.) | Local Government (Wales) Act 1994 | 1994 c. 19 | s. 20(4) Sch. 6 Pt. 2 para. 26(2) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(1) | repealed in part | Environment Act 1995 | 1995 c. 25 | Sch. 24 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(1)(a) (2) | repealed | Environment Act 1995 | 1995 c. 25 | Sch. 24 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(3)-(5A) | repealed in part | Environment Act 1995 | 1995 c. 25 | Sch. 24 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(4) | words inserted | Localism Act 2011 | 2011 c. 20 | Sch. 22 para. 38 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(4) | words substituted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | Sch. 17 para. 4(a)(i) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(4) | words inserted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | Sch. 17 para. 4(a)(ii) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(4A) | inserted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | Sch. 17 para. 4(b) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(5A) (5B) | substituted for s. 3(5A) | Housing and Regeneration Act 2008 | 2008 c. 17 | Sch. 8 para. 54 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(5C) | inserted | Planning (Wales) Act 2015 | 2015 anaw 4 | s. 40 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 3(5C) | words omitted | Legislation (Procedure, Publication and Repeals) (Wales) Act 2025 | 2025 asc 3 | Sch. 1 para. 8 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 4 | amended | The Planning (Control of Major-Accident Hazards) Regulations 1999 | 1999 No. 981 | reg. 2(2) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 5(3) | words substituted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | s. 130(7) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 7(3) | words substituted | The Energy Act 2013 (Office for Nuclear Regulation) (Consequential Amendments, Transitional Provisions and Savings) Order 2014 | 2014 No. 469 | Sch. 2 para. 6 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9 | applied in part | The Planning (Hazardous Substances) Regulations 2015 | 2015 No. 627 | reg. 23(4) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9 | applied | The Planning (Hazardous Substances) (Wales) Regulations 2015 | 2015 No. 1597 | reg. 25(4) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(1) 10 | | The Local Authorities (Functions and Responsibilities) (England) Regulations 2000 | 2000 No. 2853 | reg. 2(1) Sch. 1 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(2)(c) | words inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 43 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(2)(c) | words inserted | The Housing and Planning Act 2016 (Permission in Principle etc) (Miscellaneous Amendments) (England) Regulations 2017 | 2017 No. 276 | reg. 4(2) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(2)(c) | words inserted | Infrastructure (Wales) Act 2024 | 2024 asc 3 | Sch. 3 para. 5(2) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(2)(ca) | inserted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | Sch. 6 para. 14 | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 9(2)(e) | words substituted | The Energy Act 2013 (Office for Nuclear Regulation) (Consequential Amendments, Transitional Provisions and Savings) Order 2014 | 2014 No. 469 | Sch. 2 para. 7 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 10(1) | words inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 44 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 10(1) | words inserted | Infrastructure (Wales) Act 2024 | 2024 asc 3 | Sch. 3 para. 5(3) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 10(2) | words substituted | The Energy Act 2013 (Office for Nuclear Regulation) (Consequential Amendments, Transitional Provisions and Savings) Order 2014 | 2014 No. 469 | Sch. 2 para. 8 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 10(4) | inserted | Levelling-up and Regeneration Act 2023 | 2023 c. 55 | s. 124(6) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 11 26 | applied (with modifications) (temp.) | The Planning (Control of Major-Accident Hazards) Regulations 1999 | 1999 No. 981 | reg. 4(1) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12 38(1)-(4) | extended | Environment Act 1995 | 1995 c. 25 | Sch. 9 para. 14(2) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(2B) | inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 45(2) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(2C) | inserted | Infrastructure (Wales) Act 2024 | 2024 asc 3 | Sch. 3 para. 5(4) | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(3) | substituted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 45(3) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(3) | words substituted | The Legislative Reform (Health and Safety Executive) Order 2008 | 2008 No. 960 | Sch. 3 | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(3) | word substituted | The Infrastructure (Wales) Act 2024 (Consequential Amendments) Order 2025 | 2025 No. 1330 | art. 3 | Not yet | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(6) | word substituted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 45(4)(a) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 12(6) | words inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 45(4)(b) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 14(2)(b) | words inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 46(a) | Yes | |
| Planning (Hazardous Substances) Act 1990 | 1990 c. 10 | s. 14(2)(b) | words inserted | Planning Act 2008 | 2008 c. 29 | Sch. 2 para. 46(b) | Yes | |