Decking can make a garden much more usable, but it is worth checking the rules before you start. Height, position, drainage, privacy and the type of property can all affect whether planning permission is needed.
In many rear gardens, low-level decking is usually straightforward. Raised decking, decking near a boundary, front garden decking or decking at flats and listed properties can be more complicated. This guide explains the key points in plain English and covers practical ways to add privacy with fencing, trellis and screening.
Quick answer: In many cases, decking at the rear of a house may not need planning permission if it is no more than 300mm above ground level and does not cover too much of the garden. Raised decking, front garden decking, flats, listed buildings and conservation areas may need extra checks. Always confirm with your local planning authority if you are unsure.
Do You Need Planning Permission For Decking?
Low-level decking in a rear garden often falls within permitted development, provided it meets the usual limits. The key point is height. A deck surface more than around 300mm above ground level is usually treated as a raised platform and may need planning permission.
There are other things to consider too. The deck should not take the total coverage of additions, outbuildings and platforms beyond the permitted amount. It should also avoid causing problems with overlooking, drainage or boundary encroachment.
Rules can vary depending on the property and local restrictions. If the property is listed, in a conservation area, under an Article 4 direction, or is a flat or maisonette, check before starting work.
Decking Planning Rules At A Glance
| Factor | Lower Risk | Higher Risk | What To Do |
|---|---|---|---|
| Deck height | Up to around 300mm above ground | Over around 300mm above ground | Measure from existing ground level before building |
| Location | Rear or side garden | Front garden or visible from a road | Check local planning guidance |
| Garden coverage | Well below 50% of the garden area | Close to or above 50% with other additions | Include sheds, extensions and hardstanding in the total |
| Privacy | No direct overlooking | Looks into neighbouring windows or seating areas | Use screening, planting or a lower design |
| Property type | House | Flat or maisonette | Flats and maisonettes often need planning permission |
| Special restrictions | No known restrictions | Listed building, conservation area or Article 4 area | Check before ordering materials |
The 300mm Decking Height Rule
The 300mm height point is one of the main things to understand. If the finished deck surface is no more than around 300mm above the existing ground level, it is usually less likely to need planning permission.
If the deck is higher than that, it may be treated as a raised platform. This is more likely to raise concerns about overlooking, privacy and visual impact, especially near a boundary.
On sloping gardens, measure the height carefully at different points. A deck that is low at one end may be much higher at the other. In some cases, a stepped design with smaller levels can be more practical than one large raised platform.
How To Measure Decking Height
Measure from the existing ground level directly below the deck to the finished walking surface. Do not measure from the top of old paving, raised beds or soil that has been built up just to reduce the apparent height.
On uneven ground, take measurements at several points. Use the highest measurement when thinking about planning risk and neighbour impact.
If you are adding balustrades, privacy screens or raised planters, these may not count as the deck surface height, but they can still affect how the structure looks and how much it overlooks neighbouring gardens.
Decking Near A Boundary
Decking should sit fully within your own land. Posts, joists, steps, screens and footings should not cross the boundary or rely on a neighbour’s fence, wall or land for support.
If the deck is close to a boundary, think carefully about privacy. Even a modest change in height can make a seating area feel more overlooking to a neighbour, especially if your deck faces their patio, windows or garden seating.
If you are replacing or upgrading fencing at the same time, choose suitable fence panels, fence posts and gravel boards so the deck and boundary work together.
Decking And Neighbour Privacy
Privacy is one of the biggest concerns with raised decking. A deck can create a new viewpoint into a neighbouring garden, even if that was not the intention.
Before building, stand at the proposed deck height and check the sightlines. If you can see straight into a neighbour’s seating area or windows, consider lowering the deck, moving the seating area or adding screening.
Trellis panels can be useful because they soften the boundary and still allow light through. For stronger screening, solid fence panels or slatted designs may be more suitable.
Privacy Screening Options For Decking
| Screen Type | Best Used For | Main Benefit | Useful Category |
|---|---|---|---|
| Closeboard panels | Strong privacy and shelter | Solid, traditional screening | Closeboard fence panels |
| Double slatted panels | Modern airflow screening | Privacy without a fully solid feel | Double slatted fence panels |
| Hit and miss panels | Windier gardens and side returns | Allows some airflow through the boundary | Hit and miss fence panels |
| Trellis toppers | Adding lighter privacy above fencing | Good for climbers and daylight | Fence topper trellis |
| Full trellis panels | Planting support and soft screening | Less heavy than solid panels | Trellis panels |
Does Decking Count Towards Garden Coverage?
Decking may count towards the amount of land covered by additions and structures around the original house. This can include outbuildings, extensions, sheds, raised platforms and other hard landscaping.
A common permitted development limit is that additions should not cover more than half the land around the original house. If your garden already has sheds, extensions, patios or other structures, add everything together before assuming the deck is allowed.
If the new deck would take the total close to or over the limit, check with your local planning authority before starting work.
Decking In Front Gardens And Corner Plots
Decking in front gardens or in positions visible from a road is more likely to need planning permission. This is especially true if the deck changes the appearance of the frontage or creates a raised platform near the highway.
Corner plots need extra care because a side garden may still face a road. Even if you think of it as a side boundary, the planning authority may treat it as visually sensitive.
In these areas, lower landscaping, planting, sleepers and open fencing styles are often more suitable than raised decking and tall solid screening.
Decking For Flats, Maisonettes And Listed Buildings
Flats and maisonettes do not usually have the same householder permitted development rights as houses. If you live in a flat or maisonette, expect to check planning permission before adding decking.
Listed buildings, conservation areas and Article 4 areas can also have tighter controls. Even low-level decking may need permission or consent in some cases.
If any of these apply, get written guidance before buying materials or starting work.
Drainage And Run-Off
Decking should be planned so water drains sensibly. Water should not be directed towards the house, under door thresholds or onto neighbouring land.
Even though deck boards have gaps, the area beneath still needs proper thought. Poor drainage can leave the underside damp, encourage weed growth or create problems around nearby fencing and walls.
If the deck sits close to a fence, gravel boards can help protect the lower fence line from splashback and damp. Concrete gravel boards can be useful in areas that regularly get wet.
Building A Deck That Feels Like Part Of The Garden
The best decking designs tend to feel like part of the garden rather than a platform added on top. This is especially important on sloping sites or gardens close to neighbours.
Instead of one large raised deck, consider a lower split-level layout with steps, planting and sleeper edging. Railway sleepers can help form raised beds, step edges or simple retaining features around the deck.
Planting, trellis and lower screening can also reduce the sense of height while improving privacy and making the deck feel more settled.
Boundary Materials Around Decking
| Garden Edge | Main Role | Suitable Option | Useful Category |
|---|---|---|---|
| Rear boundary | Privacy and shelter | Closeboard panels | Closeboard fence panels |
| Side return | Light and airflow | Hit and miss panels | Hit and miss fence panels |
| Front or roadside edge | Kerb appeal and definition | Picket panels or lower decorative panels | Picket fence panels |
| Overlooked edge | Soft privacy | Trellis and climbing plants | Trellis panels |
| Wet or splash-prone base | Protecting lower fence line | Concrete gravel boards | Concrete gravel boards |
What About Handrails And Balustrades?
If the deck is raised, guarding may be needed for safety. This is separate from planning permission. A deck may be acceptable from a planning point of view but still need safe edges, steps and handrails.
Think about this early, as handrails and screens can change the overall look of the deck. They may also affect privacy and neighbour views.
For a low deck, built-in planters or sleeper edges may be enough to define the space. For higher decks, speak to a suitable professional about safe guarding and structural requirements.
Choosing Posts And Fixings For Screens
Privacy screens around decking need proper support. Do not rely on light fixings or attach screens to a neighbour’s fence.
For stronger screening, use suitable fence posts and outdoor fixings. Wooden fence posts give a traditional timber look, while concrete fence posts are a more durable option for long runs and exposed gardens.
Use suitable screws, fixings and fasteners, ironmongery and cement products where posts need to be set securely.
Decking Near Shared Access And Side Gates
If the deck is near a side return, shared path or garden gate, make sure access remains clear. Avoid creating awkward steps, narrow walkways or drainage problems that affect your neighbour.
A good side gate can help finish the space neatly and keep the garden secure. Choose suitable garden gates, gate posts and garden gate furniture so the entrance works properly with the new layout.
Step By Step Decking Planning Checklist
- Measure the height: Check the proposed finished deck level against the existing ground at several points.
- Check the location: Rear gardens are usually simpler than front or roadside positions.
- Add up garden coverage: Include sheds, outbuildings, extensions and other platforms.
- Check privacy: Look from the proposed deck position towards neighbouring windows and seating areas.
- Plan drainage: Make sure water drains away from the house, boundaries and neighbouring land.
- Confirm restrictions: Check for conservation area rules, Article 4 directions, listed status or lease restrictions.
- Speak to neighbours: Share the basic plan where the deck affects privacy or boundary areas.
- Choose durable materials: Plan screens, posts, gravel boards, gates and fixings before work starts.
Common Decking Planning Mistakes
| Mistake | Why It Causes Problems | Better Approach |
|---|---|---|
| Forgetting the 300mm height point | The deck may be treated as a raised platform | Measure carefully before building |
| Building too close to the boundary | Can increase overlooking and dispute risk | Allow space for screening, drainage and maintenance |
| Ignoring drainage | Water can pool or run into the wrong place | Plan falls and drainage before construction |
| Attaching screens to a neighbour’s fence | May damage their property and cause a dispute | Use your own posts or freestanding screens |
| Forgetting property restrictions | Listed buildings, flats and conservation areas can have tighter rules | Check before ordering materials |
Design Ideas For A More Neighbour-Friendly Deck
Low Rear Garden Deck
Keep the finished surface close to ground level and use planting, trellis and seating to define the space. This keeps the deck practical without making it feel like a raised platform.
Split-Level Deck On A Slope
Instead of one high deck, divide the height into smaller levels. Use sleepers, planting and steps to make the change in level feel natural.
Deck With Trellis Screening
Use trellis panels or fence topper trellis where you need privacy but still want light and airflow. Climbing plants can soften the look further.
Deck With Solid Privacy Panels
Where stronger screening is needed, solid panels such as closeboard can work well. In exposed areas, consider airflow-friendly options such as hit and miss or double slatted panels.
If You Need Planning Permission
If your deck needs planning permission, clear drawings will help. Show the deck position, height above ground, boundary distances, steps, screens and drainage.
It also helps to explain how the design protects neighbour privacy. Include any trellis, fencing, planting or screening that will reduce overlooking.
If the deck is near a boundary, show that posts, footings, steps and screens stay fully within your land.
Useful Categories For Decking Surrounds
- Fence panels for privacy and boundary screening.
- Trellis panels for planting support and softer screening.
- Fence topper trellis for adding light screening above a fence.
- Fence posts for secure screens and boundaries.
- Gravel boards to protect the base of fence panels near decking.
- Railway sleepers for raised beds, steps and edging.
- Garden gates for access and a finished entrance.
- Screws, fixings and fasteners, ironmongery and cement products for installation work.
FAQs
How high can decking be without planning permission?
For many houses, a deck surface no more than around 300mm above existing ground level is less likely to need planning permission. Higher decking may be treated as a raised platform and should be checked.
Can I build decking next to my neighbour’s fence?
You can build decking near a boundary if it stays fully within your land, but think carefully about privacy, drainage and access for maintenance. Do not attach screens or deck parts to your neighbour’s fence without permission.
Does decking count as a raised platform?
It can do if it is above the usual low-level threshold. Raised platforms are more likely to need planning permission, especially where they create overlooking.
Do flats need planning permission for decking?
Often, yes. Flats and maisonettes do not usually have the same permitted development rights as houses, so check before starting.
Can I add a privacy screen to decking?
Yes, but keep it within your land and make sure it is properly supported. Tall screens can affect planning, wind load and neighbour views, so plan them carefully.
Final Thoughts
Decking is usually easier to plan when you keep it low, simple and respectful of boundaries. The key points are height, garden coverage, drainage, privacy and property restrictions.
If the deck is close to neighbours or more than around 300mm above ground, check before building. A well-designed deck with sensible screening, proper drainage and suitable boundary materials will be easier to live with and less likely to cause problems later.
