Submission Requirements for Retrospective Planning Applications

A complete retrospective planning application includes seven core components: a properly completed application form clearly marked as retrospective; a site location plan and a block plan to council validation standards; existing and proposed elevations and floor plans; photographs of the development as built; a planning statement engaging the relevant Local Plan and NPPF policies; supporting documents required by the council's local validation list (heritage statement, flood risk assessment, ecology, transport notes); and the correct application fee paid directly to the council.

The application form

Every retrospective application starts with the correct council form — the same one you would use for a prospective application of the equivalent type. The form must be clearly marked as retrospective in the relevant section, and the description of the development should be precise and complete. Vague or partial descriptions are one of the most common reasons applications are returned at validation.

Detailed plans and drawings

This is where most self-submitted applications fall down. Council validation teams have specific standards for the format, scale and content of plans. The minimum drawing pack for a retrospective application is:

The validation drawing pack

Site location plan — OS-based, scale 1:1250 or 1:2500, application site outlined in red, additional ownership outlined in blue.
Block plan — scale 1:200 or 1:500, showing the development in context with property boundaries, neighbouring buildings and access points.
Existing and proposed elevations — scale 1:50 or 1:100, showing all elevations affected by the works.
Existing and proposed floor plans — same scale, showing internal layout where relevant.
Roof plan — if the works affect the roof.
Cross-sections — for sloping sites or where ground levels matter.

Drawings must be properly scaled, fully dimensioned, and prepared on a standard paper size. Hand-drawn sketches or rough measurements will be rejected at validation and the clock will keep ticking.

Photographs

For retrospective applications, photographs are particularly important — they show the case officer exactly what has been built. Provide a balanced set:

Wide-angle views from each principal direction
Close-ups of materials and construction details
Views from neighbouring properties (where you can take them) showing the impact on amenity
Before-and-after images if you have them

Planning statement

The planning statement is the document that wins or loses the application. A good planning statement does four things:

Identifies the relevant Local Plan policies and explains how the development complies with each one.
Engages the National Planning Policy Framework where relevant — particularly the social, economic and environmental objectives of sustainable development.
Addresses the obvious planning issues head-on (amenity, character, scale, materials, highway safety).
Proposes mitigation where needed, and references comparable approvals in the area.

Self-drafted planning statements are usually too short, focus on the wrong arguments (typically asking the council not to make the homeowner take the structure down), and miss the policies that actually matter.

Supporting documents (where the council requires them)

Each council publishes a "local validation list" setting out the documents it requires. The most common supporting documents for retrospective cases are:

Heritage statement — conservation areas, listed buildings, and curtilage listed structures
Flood risk assessment commentary — sites in Flood Zones 2 or 3
Tree survey input — sites with trees subject to TPOs or in conservation areas
Ecology and biodiversity net gain commentary — for sites with habitat or protected species potential
Transport and access notes — visibility splays, parking provision, access widths
Acoustic assessment — for change-of-use cases that introduce a noise source

Note: a Design and Access Statement is part of the core application pack we produce in-house — not a supporting document.

Fees

The application fee is the same as for a normal application of the equivalent type. The fee schedule is set nationally and updated periodically. The fee is paid directly by the applicant to the council via the Planning Portal at submission — it is not part of our agent fee.

The honest summary

A retrospective application is only as strong as the pack that supports it. Drawings to validation standard, a planning statement that engages the right policies, and supporting documents tailored to the local validation list — get those three things right and the case officer has everything they need to grant consent.

Frequently asked questions

Can I prepare a retrospective application myself?

Legally yes. In practice, we strongly recommend using a Chartered Town Planner. The biggest single failure point in self-submitted applications is the validation pack — drawings that don't meet council standards, missing supporting documents, or planning statements that focus on the wrong arguments.

How long does it take to prepare a complete application pack?

RPE delivers full application packs within 7 working days of instruction for standard cases. Complex cases requiring specialist input (ecology, heritage, flood risk) may take longer.

What happens at council validation?

The council checks that all required documents are present and meet the local validation list. If anything is missing or substandard, the application is returned with a list of issues — and the determination clock does not start until the application is fully validated.

Do retrospective applications cost more than normal applications?

The council fee is identical. Some councils charge double for retrospective applications, but this is unusual. Our fixed agent fee is the same for both: £450 + VAT for householder cases, £695 + VAT for everything else.

Need an honest read on your case? A Chartered Town Planner will give you a written assessment before you spend a penny. Get a free assessment →