Planning permission and building-regulations approval are separate checks. A change that is permitted development can still need technical approval. Start with GOV.UK building regulations and check the exact scope with your local authority.
In England and Wales, party-wall guidance can apply to work on or near shared boundaries. A notice or agreement depends on the proposed work; it is not required for every internal refresh. Confirm the process before starting.
Choose the use first
A place for boxes, an occasional workspace and a new bedroom are different projects. Tell your designer the intended use before asking for a stair or floor layout. Do not assume that boarding an attic makes it suitable for living space.
Survey the roof and route into the room
Record the roof form, usable height, existing access and visible services. Ask a competent professional to check loading, structure, stair access, fire precautions, insulation and ventilation. A dormer, rooflight or roof change can bring additional planning considerations.
Check the property-specific permissions
Permitted development depends on the proposal and site. Listed status, conservation areas and Article 4 directions can change the process. Use your local planning authority to establish the requirements for the exact address. Ask who will submit applications and arrange inspections before agreeing a start date.
Write a comparable quote brief
Separate survey and professional fees, approvals, structure, stairs, insulation, services, surfaces and waste handling. Record what each contractor assumes about the roof and existing building. Compare alternatives such as a storage refresh and a habitable conversion as separate scopes.
Use a concept carefully
An image can help discuss light, storage and finishes. It cannot verify a structural design or establish compliance. Mark roof slopes, openings and services that must stay, then review the idea with your professional.
Return to the London attic planning range or attic cost guide once the scope is clear.