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1. Fire Safety Certification: Required when the extension includes specific fire safety requirements or changes to fire escape routes

2. Disability Access Certification: Required when the extension affects or requires compliance with disability access regulations

3. Energy Performance Details: Required when the extension must meet specific energy performance requirements

4. Conservation Compliance: Required when the property is in a conservation area or is a protected structure

5. Structural Engineer's Certificate: Required when the extension involved significant structural works

6. Specialist Installations: Required when the extension includes specialized installations like electrical, plumbing, or HVAC systems

1. Schedule 1 - Approved Drawings: List and copies of all approved architectural and engineering drawings

2. Schedule 2 - Planning Documentation: Copies of planning permission and related correspondence

3. Schedule 3 - Inspection Records: Records of all site inspections carried out during construction

4. Schedule 4 - Building Control Documentation: Copies of all building control submissions and approvals

5. Schedule 5 - Test Certificates: Copies of any required testing certificates (electrical, plumbing, etc.)

6. Appendix A - Photographic Evidence: Photographs documenting the completed works

7. Appendix B - Compliance Documentation: Detailed documentation demonstrating compliance with building regulations