A householder planning application follows a defined statutory process — validation, neighbour consultation, a set decision period, and a specific appeal route if you’re refused — and knowing the stages helps you plan a realistic timeline rather than guessing.

What makes an application valid

Planning applications for house extensions and conservatories are submitted to the local planning authority, usually the district or borough council. For an application to be registered as valid, government guidance sets out that it needs a completed application form, a location plan showing the site in context, compliance with any locally published information requirements, and the correct fee. An incomplete or incorrectly specified application can be rejected at the validation stage before it’s even considered on its merits, which is one of the more common causes of delay — checking your council’s specific local validation checklist before submitting is worth the extra half hour it takes.

Who gets consulted, and how

Once validated, the council publicises the application, typically by writing to immediate neighbours and, depending on the authority, displaying a site notice or a notice in the local press. Neighbours and other interested parties are given a set period to submit comments, which the case officer takes into account alongside planning policy when reaching a recommendation. Objections about matters like loss of light, overlooking or overshadowing are treated as material planning considerations for a conservatory application; objections based purely on issues like disputed boundaries or a dislike of the applicant generally aren’t, though they’re still often raised.

How long a decision actually takes

Government guidance sets the statutory determination period at 8 weeks for most applications, extending to 13 or 16 weeks for larger or more complex development, or a different period if you and the council agree one in writing. In practice a straightforward householder conservatory application is usually decided within the 8-week window, but delays at validation, a request for further information, or a case officer’s workload can push this back. If the council simply fails to determine the application within the statutory period and no extension has been agreed, you gain the right to appeal on the grounds of non-determination, even though no decision has actually been made.

How the application is judged

The case officer assesses the proposal against the council’s local development plan policies and any relevant supplementary planning guidance, alongside the National Planning Policy Framework. For a conservatory, the issues that most commonly come up are the impact on neighbouring amenity (light, privacy and outlook), the visual impact on the character of the area, and, in some cases, drainage or flood risk. Applications are usually decided by an officer under delegated powers rather than going to a planning committee, unless the case is contentious, a councillor calls it in, or the authority’s scheme of delegation requires committee referral for that type of application.

If you’re refused: the appeal route

If your householder application is refused, you can appeal to the Planning Inspectorate, which is independent of the local council. GOV.UK guidance specifically names conservatories as an example of the “smaller project” category eligible for the householder appeals service, and you have up to 12 weeks from the date on the decision letter to lodge the appeal. Householder appeals are generally dealt with faster and more informally than major applications, typically through written representations rather than a hearing or public inquiry, with a planning inspector reviewing the case papers, the council’s reasons for refusal, and any objections before issuing a decision.

FAQs

Do I need planning permission for a conservatory at all?

Many conservatories are built under permitted development and don’t need a full application — this guide is specifically about the process for projects that fall outside those limits or where a full application is otherwise required, such as on a flat, in some conservation areas, or where an Article 4 Direction applies.

Can my neighbours stop my conservatory by objecting?

An objection alone doesn’t automatically block an application; the case officer weighs planning considerations raised in objections against policy, so a well-founded objection on a material planning matter carries more weight than a general complaint.

What happens if I miss the 12-week appeal deadline?

The Planning Inspectorate generally won’t accept a late householder appeal outside the 12-week window, so if you intend to appeal a refusal, treat the deadline as fixed rather than assuming an extension will be granted.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• GOV.UK: Making an application (validation and statutory decision periods)
• GOV.UK: Appeal against a householder planning decision
• GOV.UK: How long you have to appeal a householder planning decision

Related guides

Compare Conservatories is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not legal advice on any specific application — always confirm current requirements with your local planning authority.