Planning Permission for Decking

Get the correct permissions and stay out of trouble with your new deck

Adding Decking to your property is a great way to add a modern aesthetic and versatile outdoor space to your home. When adding a deck to your garden, it is important to check for any planning restrictions and if your Decking design requires planning permission. 

If any structures or buildings are built without the correct planning permission, they are at risk of being dismantled by the local planning authority, if your decking is installed without permission, then you could also fail to gain any compliancy certificates, which could cause issues if you plan on selling your property in the future.

Article Contents

  • Planning Permission & Regulations Explained
  • When Do You Need Planning Permission For Decking?
  • Informing Your Neighbours (They can refuse)
  • How to Get Planning Permissions For Garden Decks
  • When Do You Need Building Regulations Approval?
  • How to Get Building Regulation Approval

Planning Permission & Regulations Explained

To know which to apply for, you must know the differences between Planning Permissions and Building Regulations. 

Planning Permission - This is covered by the Local Planning authorities, to support and guide the regional district, ensuring any house changes, extensions or decks follow the regional look and appearance. The local authority works hard to maintain a certain standard of build, so neighbours and other houses value and the surrounding countryside will not be affected. 

Building Regulations - This is covered by the local governing body, these regulations look to introduce standards for any new industrial, domestic, or commercial buildings which will protect the safety of all individuals. 

The two regulating local authority bodies are entirely separate and managed differently. For most Decking installations that are deemed safe, at an appropriate height, Planning Permissions may be needed.


When Do You Need Planning Permission For Decking?

When you are adding either a raised or level decking, planning permission may be required. Please note we are not Building Surveyors and recommend seeking professional advice for any home extensions, revamps, or builds. 

Some UK structures will fall under 'permitted development' meaning that you may build or add decking or other external additions to them without planning permission providing the following criteria is met:

  • The Decking structure height is no more than 30cm above the ground 
  • Together with other extensions, outbuildings, etc the decking or platforms cover more than 50 percent of your garden 
  • The deck, raised platforms, or outside building, is being built past your property's front wall.

If your home and garden area is part of a conservation area, or in areas of Outstanding Natural Beauty, such as National Parks, The Broads or Areas of Natural Beauty further requirements have to be met and will require planning permission if they meet the following: 

  •  The area to be covered, which includes, extensions, buildings, and decking, or other raised platforms, must be more within 20 metres from the house.
  • The area is only limited to 10 square metres.

There are also several situations where permitted development rights rules will not apply – and decking planning permission must be obtained and with certain rules applying to the decking or other raised platform: 

  • If your decking is situated within 20 metres of a highway
  • If the decking or platforms affect the value of privacy of the neighbouring house or garden
  • If the decking will be attached to a listed building or situated within a conservation area.
  • If any section of the deck is higher than three metres, this includes any balustrades and or handrails. 

Further restrictions apply if you want to add a new decking area within the curtilage (enclosed garden area) of a listed building. 

More information can be found here.


Informing Your Neighbours (They can refuse)

If you require planning permission for any addition to your home, as well as contacting your local planning authority it is highly recommended to reach out to your neighbours. Even if your project meets permitted development standards, it is courteous to inform any affected parties before building. 

Permission can be denied if your neighbours are against your decking, even if the decking is the correct height and covers less than 50 percent of your garden. If your decking or structure impacts them in any way, by law, permission must be acquired from them before construction can begin. 

How to Get Planning Permissions For Garden Decks

Adding a ground level or raised deck to your property may need planning permission. If decking or platforms cover, together with other extensions, fifty percent of the garden area and are more than 30cm above ground level then an application for planning permission will need to be filed. 

Any outbuildings, extensions, or raised decking planning permission application forms can be found either online or at your local planning authority, which can be found through your local government. See the Government website here for more information 

Decking now requires planning permission even if the planning decking application is for reworking or replacing an existing decking structure, attached to your house.

When applying for planning permission, decking structures must do the following: 

  1. Fill out the online application form at the official planning portal, created by the UK government for this purpose. 
  2. Most planning applications need a location plan which shows the proposal in its surrounding context and a site plan.
  3. Provide your full house address 
  4. Full details of the project, including height, width, and length
  5. Detail if it will have any impact on the surrounding area, this is particularly important if applying in listed or conservation areas. 

For further information or any help with your application for planning permission see your local government's website, contact your local planning office or visit the official planning portal.


When Do You Need Building Regulations Approval for Decking?

Building regulations are required if there are any safety issues with the planned decking, this may result in needing an application for the build.

To avoid this the following rules need to be met:

  • When building your decking or raised platform, ensure that anyone, no matter the age is safe when on the decking
  • The ground structure of the decking must be of the correct dimensions and firmly fixed, to ensure stability
  • Even the 30cm above the ground decking could pose a safety hazard for children and elderly users, if the deck is installed at a greater height the chances of someone falling and hurting themselves also increases. 
  • Tall Decks will have regulations around the incline of any stairs leading up to your decking & the steepness of each step.
  • Decks of a certain height will have to ensure Balustrades or railings are fitted and meet health and safety decking regulations. 

When applying for building regulations or planning permission ensure to check that your building does not fall under permitted development. If your build has permitted development rights, (the deck or other buildings do not cover more than 50 percent of the garden, and the deck is no more than 30cm off the ground), then you do not need to apply for building regulation permissions. For more information about permitted development rights, see here

How to Get Building Regulation Approval

Building Regulation approval may be required if any new alterations or structural work is being undertaken on your property. 

Before you can build your decking, you must receive approval from the Building Regulations Office, this can be done in the following ways: 

  1. Don't fit the Decking yourself, instead use registered tradesmen on the  Competent Person Register. They will then inform the local authorities of your plans and if you are needing an application, they can then do this on your behalf. 
  2. Once your structure has been planned out, employ a Local Authority Building Control Body (BCB) to check and apply for any permissions you may need.
  3. Any Private Building Control Body (BCB) can apply for planning approval on your behalf. 

For any additional building work to your property, extensions outbuildings etc the decking must conform to the aforementioned requirements. For further information about building regulations and how to get them approved, see here.



If you're planning on replacing an old decking area or building a brand new one, panning permission may have to be acquired. 

If your decking does not fit under Permitted Development rules such as: 

  • The deck's height is not higher than 30cm
  • Together with other buildings, the decking does not cover more than 50% of your garden 

Then planning permission is necessary, planning permission providing you with the legal right to build your new deck can be applied for via your local authority or the government website here.

If you have received your permission and are wanting to begin your Decking installation, Cladco provides a range of Composite and PVC Decking boards. Order a sample here

Cladco also has a Decking Calculator available, to estimate the amount and cost of Decking Boards, Trims, and Fixings you may need for your installation. 

For further information about Cladco Decking see our website, or contact our friendly sales team on 01837 659901