A building permit application is the formal request submitted to the local building authority to obtain permission for constructing, renovating or extending a structure. It includes all required documentation such as architectural drawings, structural calculations and site plans, which the authority uses to assess whether the proposed works comply with building regulations.
When is a Building Permit Required?
Not every construction project requires a permit:
- Permit required — new builds, major extensions, loft conversions, and changes to listed buildings
- Permitted development — small rear extensions, certain outbuildings, and non-structural internal alterations (subject to conditions)
- Prior approval — some works only need prior approval for specific aspects like appearance or transport impact
Application
The building permit application is the first formal step in most construction projects:
- Residential — building a new home, adding a dormer or constructing an extension
- Renovations — removing load-bearing walls or altering the building envelope
- Commercial — constructing offices, workshops or retail premises
- Boundary structures — tall fences or walls along public roads
What Documents are Needed?
- Architectural drawings — floor plans, sections and elevations to scale
- Structural calculations — proof that the structure meets building regulations
- Site plan — showing the position of the building on the plot
- Photographs — of the existing situation and surroundings
- Design statement — explaining how the proposal fits the local context
Related Terms
- Building regulations
- Planning permission
- Building code
- Structural engineer
- Site plan
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