Planning Application Timelines: What to Expect

A detailed guide to how long each stage of a planning application takes, from pre-application to decision and beyond.

One of the most common frustrations with the planning system is not knowing how long things will take. While there are statutory targets for decision-making, the reality is that timelines vary significantly depending on the type of application, the complexity of the proposal, and how busy your local planning authority is.

This guide breaks down each stage so you know what to expect - and where delays are most likely to occur.

Stage 1: Pre-Application (Optional) - 4 to 8 Weeks

Before submitting a formal application, many applicants seek pre-application advice from their local council. This is not mandatory but is strongly recommended for anything beyond a simple extension.

Most councils aim to respond to pre-application enquiries within 4 to 6 weeks, though some take longer. The response will give you an informal indication of whether your proposal is likely to be supported, and any changes the council would want to see.

Stage 2: Preparing Your Application - 2 to 6 Weeks

The time needed to prepare your application depends on its complexity. A simple householder application for a rear extension might take 2 weeks if your architect has availability. A major development could take months to prepare, with surveys, reports and detailed drawings required.

Documents typically required include:

• Site location plan and block plan
• Existing and proposed floor plans, elevations and sections
• Design and access statement (for larger projects)
• Supporting reports: flood risk assessment, ecology survey, heritage impact assessment, transport statement

Stage 3: Validation - 1 to 3 Weeks

After submission, the council checks your application is complete. If everything is in order, validation can happen within a few days. However, if documents are missing or the fee is incorrect, the council will request corrections, which can add 2 to 4 weeks.

The statutory determination period only starts once the application is validated - so delays here push back your entire timeline.

Stage 4: Consultation - 21 Days (Minimum)

Once validated, the council notifies neighbours and statutory consultees. The standard consultation period is 21 days, during which anyone can submit comments, objections or letters of support.

If the proposal is amended during the application process (for example, the applicant reduces the height following objections), the council may run a re-consultation, adding another 14 to 21 days.

Stage 5: Assessment and Decision

This is where the statutory targets apply:

You can see how your local council performs against these targets on Planning Signal. Some authorities decide over 95% of applications within target, while others consistently miss deadlines.

What Causes Delays?

The most common reasons for applications taking longer than expected include:

• Incomplete submissions - missing drawings or reports that delay validation
• Amendments during the process - changes to the scheme trigger re-consultation
• Statutory consultee responses - waiting for highways, drainage, or ecology comments
• Committee referral - if the application is called to planning committee rather than decided by officers under delegated powers, this can add 4 to 8 weeks
• Section 106 negotiations - for major developments, legal agreements on affordable housing and infrastructure can add months
• Extensions of time - councils often ask applicants to agree an extension beyond the statutory target to avoid an appeal on non-determination grounds

Stage 6: After the Decision

If approved, you have 3 years to start work (unless a shorter period is specified in the conditions). Before starting, you may need to:

• Discharge pre-commencement conditions (typically 6–8 weeks per condition)
• Obtain building regulations approval (separate from planning)
• Serve notice under the Party Wall Act if building near a boundary

If refused, you have 6 months to appeal to the Planning Inspectorate (12 weeks for householder appeals). The appeal process itself can take 3 to 12 months depending on the method used.

Tips for Keeping Your Application on Track

1. Get pre-application advice - it costs a few hundred pounds but can save months of delays
2. Submit a complete application - check your council's validation checklist before submitting
3. Respond quickly to requests - if the council asks for additional information, provide it promptly
4. Use an experienced architect or planning consultant - they know what each council expects and can prepare applications that sail through validation. Find an architect near you
5. Monitor your application - use Planning Signal to track status changes and stay informed

What If the Council Misses the Deadline?

If the council does not make a decision within the statutory period (8 or 13 weeks), you have two options:

• Agree an extension of time - the council will often ask for this. It gives them more time to assess the application without you losing your right to appeal. Most applicants agree, as it shows willingness to work with the council and often leads to a better outcome
• Appeal on grounds of non-determination - you can appeal to the Planning Inspectorate if the council fails to decide within the statutory period. The inspector will then decide the application, effectively taking it out of the council's hands. This is a strong negotiating tool, but use it carefully - if the council was close to approving with minor amendments, an appeal could result in a less favourable outcome

How Council Performance Varies

Planning performance varies dramatically between councils. Some authorities consistently decide applications quickly and have high approval rates, while others are chronically understaffed and miss targets regularly.

Factors that affect council performance include:

• Staffing levels - many councils have lost experienced planning officers due to budget cuts. This is the single biggest cause of delays
• Application volumes - councils in high-growth areas receive far more applications per officer than rural authorities
• Political sensitivity - controversial applications are more likely to be referred to committee, adding weeks
• IT systems - some councils still use outdated case management systems that slow down processing

You can compare council performance on Planning Signal's council pages. Check your local authority's average decision time, approval rate, and how they compare to the national average before submitting your application.

Real-World Timeline Examples

To give you a realistic picture, here are some typical project timelines from pre-app to completion:

These timelines assume a smooth process. Add 2-3 months if the application is refused and you need to redesign and resubmit, or 6-12 months if you appeal.

Understanding these timelines helps you plan your project realistically. Building in buffer time for each stage means fewer surprises and a smoother path from concept to construction.