An address in West End Green, one in the neighbourhood plan area and one over the boundary in Brent can each raise different checks. Note who submits each application and who certifies the work.
Planning permission
Does the proposal amount to development, and are any permitted-development rights restricted?
Ordinary internal alterations generally fall outside the planning definition of development. External changes, extensions, excavation and changes of use need their own assessment; an internal structural alteration is not automatically a planning application.
GOV.UK: when planning permission is required
Listed-building consent
Could the work affect the building's special architectural or historic character?
Listing can protect interiors as well as the exterior. Check the full proposal, including historic fabric and layout, rather than assuming Grade II means only the front elevation matters. The list description is not an exhaustive inventory.
Historic England: listed-building consent · Historic England: understanding list entries
Building Regulations
Which work needs approval, inspection or certification?
Building Regulations are separate from planning permission. Structural alterations, new bathroom plumbing and electrical work near a bath or shower can bring different requirements. Agree the applicable route and the completion evidence before work starts.
GOV.UK: Building Regulations approval · Camden: building control step by step
Lease and freeholder consent
What does the lease permit, and what belongs to the shared building?
A lease may require landlord consent independently of council approvals. Establish responsibility for structure, external walls, shared services and common areas. Check flooring restrictions and the managing agent's requirements before fixing the specification.
LEASE: alterations and home improvements