Which period applies?
An ordinary householder application normally falls within the eight-week period. Major applications normally have thirteen weeks, while applications requiring Environmental Impact Assessment normally have sixteen weeks. Separate procedures, including certain technical details consent and prior approval applications, have different rules. [1][2]
The category matters more than how difficult the project feels to its owner. Ask the council to confirm the application type and statutory or agreed date recorded on its system. Do not use a neighbour's experience with a different procedure to calculate your deadline.
Validation comes first
The relevant starting point is a valid application, including the required information and fee, rather than the day you first sent incomplete drawings. The legislation measures the period from the day after receipt of a valid application. [2]
Enfield's published process similarly explains that an initially invalid application does not enter the ordinary eight-week decision period until the required information has been received. Keep both the original submission date and the confirmed valid date in your records. [3]
What happens during that period?
The council publicises and consults on the application, considers the relevant responses and assesses the proposal before issuing a decision. This is an assessment period, not a guaranteed interval with no contact required from the applicant. [3][4]
A practical project programme should distinguish validation, consultation, requested information, any design revisions and the decision itself. This makes a delay visible at the point it arises, rather than discovering at the end that somebody was waiting for a report.
Extensions of time
A longer period can be agreed in writing. Before agreeing, ask why the extension is needed, what remains outstanding and what is expected to happen by the proposed date. Keep the agreement rather than relying only on the target shown on a public portal. [1][2]
An extension may be useful where it allows an identified issue to be resolved. It should not be confused with a promise of approval. Consider its effect on non-determination appeal rights and any application-fee refund before accepting an open-ended programme. [1][5]
Permission is not automatic when time runs out
For an ordinary planning application, expiry of the decision period does not authorise development. A non-determination appeal may become available instead. The special consequences attached to some prior approval procedures must not be imported into a householder or full application. [5]
For your building programme, keep the planning decision date separate from the date when conditions, technical approvals and other necessary arrangements are ready. An eight-week planning target is not an eight-week guarantee that construction can start.