Planning agent, consultant or doing it yourself

For a straightforward rear extension on an unconstrained house, most householders can submit the application themselves. For anything touching a conservation area, a listed building, a flood zone, a protected tree or a previous refusal, an agent usually saves more than the fee. The honest answer to do I need a planning agent is that it depends on one thing: whether the application needs an argument, or just a correct set of drawings and forms.

Note that an agent is not a protected title. Anyone named on the form as your agent becomes your agent, so the question is what the person actually brings.

What an agent does on a small application

On a householder application the work is more administrative than people expect. The agent completes the forms, chooses the right application type, picks the correct ownership certificate, assembles the drawings to the right scales, checks the authority's local validation list, pays the fee, submits, then handles the officer's queries and the neighbour consultation responses.

They also hold the correspondence. Once an agent is named, the authority writes to them rather than to you, which is convenient until it is not, so agree how messages are passed on.

What a good agent adds beyond the paperwork is judgement about what to apply for. The difference between a scheme that is refused and one that is approved is often a few hundred millimetres of depth, a hipped rather than gabled roof, or an obscure-glazed window instead of a clear one. Knowing which concession to offer first, and when to offer it, is the skill you are buying.

Where a householder can reasonably act alone

Do it yourself where all of the following are true.

The house is not listed, is not in a conservation area, has no Article 4 direction over it, and is not in a flood zone. There are no protected trees on or next to the site. There is no previous refusal on the property. The scheme follows the council's published householder design guidance without needing an exception. And the neighbours have seen the drawings and have no objection.

In that situation the application is a form-filling exercise, and the national portal walks you through it. A competent drawing package from a technician, costing far less than a full agent service, plus your own time on the forms, is a reasonable approach.

One practical warning. The commonest reason a householder application is delayed is invalidation, usually a missing or wrongly scaled plan. Location plans are normally required at 1:1250 or 1:2500 with the site edged red, and existing and proposed drawings at 1:100 or 1:50 with a scale bar. Check the authority's own validation list before submitting, because local requirements sit on top of the national ones.

Where an agent earns the fee

Six situations where the fee is usually recovered:

• A conservation area or a listed building, where the test is the effect on character or on special interest and the submission needs a heritage argument rather than a description.
• A flood zone, where the drainage and finished floor level evidence has to be right and the Environment Agency may comment.
• A protected tree or a tree in a conservation area, where the works need separate consent or notification and the root protection area shapes the design.
• A previous refusal, where the new scheme has to address the reasons for refusal explicitly and an appeal decision may be in play.
• An objecting neighbour, particularly on daylight, overlooking or noise, where measured drawings answer the objection and prose does not.
• Anything at the edge of policy, such as a two storey side extension in a street of unbroken gaps, or an annexe that might be read as a separate dwelling.

In those cases the decision is a judgement, and a submission that anticipates the officer's reasoning is worth more than one that waits to be told.

Professional membership and what it tells you

There is no licence to practise planning, so membership is the available signal.

Chartered membership of the Royal Town Planning Institute, shown as MRTPI, means an assessed route to competence and a code of professional conduct with a complaints process behind it. For design-led work, chartered architect status carries the equivalent weight. Many capable agents are former local authority planning officers without chartered status, and experience of the specific authority is a real advantage.

Ask three things. Whether they hold professional indemnity insurance and at what level. How many applications they have submitted to this particular authority in the past year. And whether they will handle an appeal, and at what cost.

A directory of professional reviewers is a route to specialist review where a technical report needs signing off by someone qualified in that field, which is a different service from planning agency.

Fee structures and what is excluded

Most householder work is quoted as a fixed fee for the application. The variation between quotes usually comes from what the fee excludes, so get the exclusions in writing.

Commonly excluded: the authority's planning application fee itself, measured survey and drawing production, structural engineering, any specialist survey, a pre-application enquiry fee, revisions after submission, and the appeal if the application is refused. For context, PlanScope publishes a typical consultant range of £500 to £2,500 for a Planning Statement alone, which shows how quickly a document-heavy application adds up.

Hourly rates are better for open-ended work such as negotiating on a contested scheme, and worse for a defined submission. Where an agent proposes an hourly basis for a simple householder application, ask why.

Who holds the relationship with the case officer

This matters more than it sounds. The named agent receives the validation email, the consultation responses, the officer's requests and the decision notice. If the agent goes quiet, you may not know the application has stalled.

Agree at the outset that you will be copied on correspondence, and ask for the application reference as soon as it is registered so you can follow it on the authority's own planning register yourself. If an agent is replaced partway through, the handover needs the files rather than a summary, for the reasons set out in the note on changing consultant mid-application.

Handling an appeal if it comes to that

A refused householder application can be appealed, and the householder appeal route is an expedited written representations procedure with a tight deadline, commonly 12 weeks from the date on the decision notice. Check the current deadline on the national appeals guidance before relying on that figure.

The important constraint is that new evidence is generally not accepted in a householder appeal. The Inspector decides on the material that was before the council, which means the quality of the original submission determines the appeal. That is the strongest practical argument for getting the submission right first time, with or without an agent.

If you are choosing an agent partly for the appeal risk, ask about their record, and read the note on checking a consultant's appeal track record for what to ask and where to look.

Questions to ask before instructing

1. What exactly is included, and what will be invoiced separately.
2. Who produces the drawings, and are they a qualified technician or architect.
3. Have you submitted to this authority recently, and what did you learn.
4. What do you think the main objection will be, and how would you answer it.
5. Will you handle a refusal and an appeal, and on what basis.
6. Do you hold professional indemnity insurance.

An agent who answers question four with a specific, local reason is worth more than one who answers it with reassurance. Browse the index of report types to see which documents an application like yours is likely to need before you ask for a quote.

Enter your postcode on PlanScope to see which reports your project is likely to need, whichever route you take.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.