Building Regulations 2010: Primary legislation ensuring the extension meets current building standards including structural safety, fire safety, ventilation, and energy efficiency requirements

Building Act 1984: Framework legislation that provides the basis for building regulations and defines requirements for building control approval

Party Wall Act 1996: Legislation governing works affecting shared walls or boundaries, particularly relevant for attached properties or work near property boundaries

Town and Country Planning Act 1990: Ensures compliance with planning permission requirements and confirms the extension meets approved plans

Construction (Design and Management) Regulations 2015: Regulations covering health and safety requirements during construction and defining responsibilities of different parties involved in the project

Building (Approved Inspectors etc.) Regulations 2010: Legislation relevant when private building control inspectors are used, defining requirements for inspection and certification

Local Authority Building Control Requirements: Specific requirements set by the local authority for building control and inspection in their jurisdiction

Planning Conditions: Property-specific conditions attached to planning permissions that must be satisfied

Conservation Area Restrictions: Additional requirements and restrictions that apply if the property is located within a conservation area

Listed Building Considerations: Special requirements and restrictions that apply if the property is a listed building or affects the setting of listed buildings