Outline planning permission: definition, process, pros and cons

Written by: Giovanni Patania on 5th November, 2025

Architect Director

Outline planning permission is like “planning permission-lite.” It’s a way to find out if your project is acceptable in principle, even if you haven’t worked out the full design yet. You’re asking the council to agree to the broad use of the land, the scale of development, and the idea behind it.

Although full permission isn’t guaranteed, outline consent gives you a clear early sign that the council supports the proposal. It lets you pause and plan with confidence before you spend time and money on detailed drawings and reports.

In this article, you’ll find out what outline planning permission covers, how it compares to reserved matters, and where the risks and rewards lie. You’ll learn when it’s the right move, what to include in your application, and how to avoid common delays using real examples and tips.

What is outline planning permission?

Outline planning permission is a way of getting a local planning authority to agree to the general principle of a construction project and the scale of a development.

It’s like a rough sketch of what you want to use the land for, any new buildings you’ll put up and any changes to existing buildings already there.

Outline planning doesn’t cover the five reserved matters: access, appearance, landscaping, layout, and scale. You’ll need these, though, if you do actually seek full planning permission later on.

Councils base their decision on the following two frameworks:

Development plan: The council’s main rulebook for what can be built in your area. It sets out where homes, shops and other buildings should go.
National Planning Policy Framework: The government’s guide that councils must follow when deciding if a project is suitable or not.

You’ll need to show how these fit around your idea.

Although you don’t have to include reserved matters in an outline plan, it’s best to include the basics the council needs to know now.

You’ll also need to:

Complete the right ownership certificates (A–D)
Say if you’re the sole owner or have a freehold interest or leasehold interest
If any of the land is part of an agricultural holding, use the right certificate and serve notice on the agricultural tenant first.
On farmland? Learn the planning rules for agricultural land.

WindsorPatania note: If you’re converting an agricultural building, check whether Class Q permitted development rights apply. This can be a faster route than a full planning application.

Here’s what you should set out at each stage:

When outline planning permission is a good idea

Getting outline permission is a good idea in the following six scenarios:

Scenario	Why an outline application helps	What you show in an outline planning application	Watch-outs
Big or phased site (major projects)	On larger, more expensive developments, you can prove the site works before committing money on full designs.	Show where the buildings could go and their tallest height. Give simple height, width and length ranges to fix the development scale. Highlight one safe way in and out. Share what you want consent for, like “up to 60 homes” or “up to 4,500m² of work floor space”.	Ask the council early if you’ll need an Environmental Impact Assessment (EIA) as this can affect the timetable (determination period).
Selling the land with planning consent	Investors buy land without planning permission with the aim of securing it and selling the land on at a profit	Show what you’re proposing (like housing, flats and number of units) and mark out any features that affect value or buildability like trees and flood zones. Add a blue line to show other land you own and the red line for the land owned and land required for access to the public highway. Put a red line around the area you’d develop.	This is a competitive market, so vague consents sell for less. Provide a location plan and enough supporting information for buyers to compare sites like-for-like.
Testing out different design ideas	You may have many development ideas for a site or building but you want feedback before progressing	Keep each idea within the same clear “buildable area” and to the same heights with one working access point for people, bikes and vehicles. Show simple circulation routes so each option has the same access arrangement.	Decide on one access layout that meets all rules and is big enough for the most demanding option. This includes issues like visibility, turning space, fire and refuse access, and parking. This lets the highways officer check the wider road network without needing extra details.
Sensitive or historic setting	Check how acceptable your idea is before committing to full drawings	Provide simple block shapes showing the size of the buildings (external built form) with one or two key views and a short note on the impact on heritage or townscape (visual impression and design principles).	For projects near listed buildings or in a conservation area, provide a bit more early design detail (materials, decoration, lighting and colour) to help the council understand your idea better
Lender wants planning comfort	Lenders are more likely to advance funds if they feel your development has a strong chance of being approved.	A simple plan showing where buildings could go and the tallest height. Add short notes on traffic and access, and where rainwater will drain. Include a simple timetable for the later reserved matters steps.	Planning conditions can still be demanding and may hold up lender approval. Give enough detail early on to reduce that risk. For larger developments, expect longer timelines and tighter information requirements from lenders.
Tricky access or drainage	You can agree on the principle of development before spending on detailed engineering.	A short access statement in plain English stating who enters and where. Show how the entrance meets the public highway and any circulation routes inside the site. Include a sketch showing where water will go (drains, ponds or water features).	If there’s any doubt about safety or flooding, the council can ask for more detail within a month.

You still have to give a lot of details in your outline planning application form. It’s not an easier route to full planning permission, but it does mean you don’t have to lock down the full design yet.

Reserved matters application

Outline planning doesn’t cover the five reserved matters: access, appearance, landscaping, layout, and scale.

You can submit these all at once or in stages. But if the council can’t assess your outline properly without some of them, they’ll ask for supporting information. It’s a good idea to prepare the following:

Access: Pin down where the entrance will go and how wide it is. Show sight lines from the road, and add simple vehicle tracking for bin lorries and fire engines. Include parking and cycle numbers, and write a short one-page access summary covering access and circulation routes and links to the surrounding access network.
Appearance: Add one or two street-level visuals to show what the buildings will look like. Include a brief note on the likely external materials (architecture, materials, decoration, lighting and colour).
Landscaping: Sketch where your green space, paths and boundaries will go. Mark any trees you need to protect, and note how you’ll manage water run-off using basic SuDS (sustainable drainage) if relevant. Show open spaces, any public art, other earthworks and other amenity features.
Layout: Provide an outline site plan showing building footprints, routes through the site, parking, and open space. Highlight the key distances between homes to help test for compliance on privacy and daylight issues.
Scale: Set clear limits on building height and the number of storeys. Include a simple section drawing showing how your buildings relate to neighbours and the wider street.

Use the reserved matters application form. This is not a full planning application for full planning permission. If you are unsure which route to use, speak to the local authority.

It’s a good idea to speak with the local planning authority first for further guidance on:

What they’d be looking for with this type of development proposal
Whether your site triggers extra checks, like flooding, heritage, or access issues

It’s best not to make an outline application if:

Your scheme is a smaller development, like a single house, small conversion or infill plot
You’ve already completed a full design, meaning you’ve decided on issues like layout, appearance and access

In these cases, it’s better to submit a full planning application now.

HMO Architects note: In the Green Belt? Read what Green Belt rules might mean for your site. Open countryside? Check Paragraph 84e for how councils class exceptional homes.

How to apply for outline planning permission

Speak to the council’s planning team first. Ask what they expect for your site and where to find their guidance. If it’s a larger scheme, check whether you need EIA screening. If EIA applies, ask for a scoping opinion and then prepare and submit an Environmental Statement.

HMO Architects note: See how planning permission in London works borough by borough.

Step one

Set out the bigger picture for the planning authority with:

Location plan: Draw a red line around the site and add a blue line around any extra land you control.
Simple site plan: Mark the main access point and how people or vehicles move through the site.
Outline description: Explain exactly what you’re proposing like “up to four dwellings” or “2,000m² of workspace”.
Ownership certificates: Choose and complete the right form. Certificate A is for when you own it all and B for when you know all the owners other than yourself. C is for when you know some owners but not all of them and D is for when you don’t know any of the owners. You all must include an Agricultural Holdings Certificate with all applications.
Supporting information: Only add reports you know the council will need now like a short drainage note or a one-page access summary. Be aware though that they may want more from you later on.

Step two

Complete the application form, upload your plans and any supporting information, and pay the fee.

Make sure:

File names are clear (for example, Site-Location-Plan.pdf or Drainage-Note-Oct2025.pdf)
Figures match across documents (for instance, if the site area is 0.42 ha, that number should be the same on the location plan, site plan and application form)

This will make your application easier to judge.

Step three

The council checks your submission at what’s known as the “validation” stage.

If anything’s missing, they’ll ask you to send it over. They then consult with neighbours and other statutory bodies to see what effect your proposal will have on nearby homes, streets, and traffic.

A planning officer reviews the responses and then writes a report. A decision comes normally within eight weeks for smaller schemes and 13 for major developments, If an EIA is needed, the waiting time might be as much as 16 weeks. Most decisions come with conditions you’ll need to deal with later.

If the council approves your application, you then need to submit a reserved matters on the remaining issues to complete your planning application. You submit this separately and it has its own validation, consultation and decision period. They also vary between eight and 13 weeks on average.

Outline planning permission: checklist

Outline planning permission isn’t right for every development. Use this checklist to see if it’s an approach you should take:

Question	Yes?	Why this points to outline planning permission
Your design isn’t fixed and you want options on layout, appearance or scale.	☐	You can agree the principle now and sort reserved matters later.
The site is large or will be built in phases (major development).	☐	You can lock the general principles and phase the detail.
You plan to sell the site with consent.	☐	Outline permission can make the site easier to market.
You want the local planning authority to confirm the idea before full design spend.	☐	Outline permissions gives you a “yes in principle”.
Access is tricky or on a fast road.	☐	You can decide on a safe entrance and keep the rest flexible.
The setting is sensitive (conservation area or near a listed building).	☐	You can test visual impression without having to invest in full drawings.
Your lenders need a consent-in-principle requirement.	☐	This will satisfy that.
You’re choosing between several viable layout options.	☐	If you keep the same footprint and height limits, you can test different designs without changing the overall plan.
You want to spread report and survey costs.	☐	Do the minimum now and put off the finer details for the reserved matters.
You might need an Environmental Impact Assessment (EIA), which starts with a screening to see if a full environmental statement is required.	☐	Outline permission helps you agree the scope of that assessment while keeping the design details flexible.Count your “Yes” votes and :

0–2 Yes: apply for full planning permission. Your design is fixed or simple.
3–4 Yes: get pre-application advice, then choose outline or full.
5+ Yes: apply for outline planning permission.

As mentioned earlier, go full if you already have a full design or it’s a smaller development.

WindsorPatania: your architectural partners in planning

Outline planning permission is most useful when you need flexibility with your site, budget, or schedule. It’s also useful when you want planning certainty before spending on full drawings and technical reports. The process isn’t quick or simple, but it gives you more flexibility within planning policy.

If you need help preparing your pack or want advice on what to include, WindsorPatania is here to support you with services including:

To get started, submit a project, email us or call us. We look forward to hearing from you.

HMO Architects note: Planning a retrofit? See how a pre-construction survey saves you time and money.

Outline planning permission frequently asked questions

Do I need to tell anyone before I apply?

Yes. The council will consult the local community. If you don’t own the whole site, you must serve notice on all the other owners using the right ownership certificate and Article 13 notice.

What can outline cover, and what happens if it’s approved?

You can apply for one or more dwellings or a set floorspace. If approved, it’s granted subject to conditions. You’ll then submit details through a reserved matters application, including appearance (materials, decoration, lighting, colour and so on). The council may ask for further information to decide.

How long will it take, and how do you keep things moving?

Target decision times are 8 weeks (smaller schemes), 13 weeks (majors), or 16 weeks if EIA applies. Reply to any request for further information at the earliest opportunity. After consent, how long the development takes on site depends on your contractor and build method, not just planning.

Architect Director