Decking near a boundary or neighbour — the rules (UK guide)

The short answer

There is no single fixed 'distance from the boundary' for decking, but several rules and considerations apply near a neighbour. Low decking — no more than 30cm above ground and within the 50% garden coverage limit — is usually permitted development wherever it sits in the garden. The bigger issue near a boundary is height and overlooking: a raised deck that looks directly into a neighbour's garden or windows often loses permitted development rights and can attract objections, so it may need planning permission. You should also check boundary ownership before fixing anything to a shared fence, and any covenants in your deeds. Listed buildings and conservation areas have tighter rules.

People often ask how close to the fence decking can go. The honest answer is that height and privacy matter far more than distance — here is what actually governs decking near a boundary.

Decking near a boundary

Low deck (under 30cm)Usually permitted anywhere in garden
Raised deck overlookingMay need planning permission
Distance to fenceNo single fixed limit
Shared fenceDon't assume you can fix to it
Also checkCovenants and conservation area

Planning: it's about height and overlooking, not distance

Many people expect a set minimum distance between decking and the boundary. In practice, the planning rules focus on height and privacy rather than a fixed setback. Under permitted development, low decking — no more than 30cm above the natural ground level, and within the 50% garden coverage limit when added to other structures — is generally allowed wherever it sits in the garden, including close to the boundary.

The issue arises with raised decking near a boundary. A platform high enough to let you look directly over the fence into a neighbour's garden or windows raises an overlooking and loss-of-privacy concern. Raised decks already tend to exceed the 30cm permitted development limit, and the overlooking issue is a common reason planning permission is required and a common ground for neighbour objections. So the closer a raised deck is to a boundary, the more likely privacy becomes the deciding factor.

Raised + close to the boundary = check first: a low deck near the fence is rarely a planning problem, but a raised deck near a boundary that overlooks next door is exactly the case that most often needs planning permission.

Boundary ownership and fixing to a shared fence

Building near a boundary brings up who owns the fence or wall. You cannot assume you may fix decking, posts or a balustrade to a boundary fence, because it may belong to your neighbour, or be jointly owned. Fixing to, leaning on or undermining a neighbour's fence without agreement can cause a dispute.

Before building close to a boundary, it is sensible to:

Check your deeds or title plan to see which boundaries are yours, though plans do not always settle ownership definitively.
Keep the deck structure self-supporting rather than relying on the neighbour's fence for support.
Talk to your neighbour early if the deck runs along a shared boundary, especially if it is raised.

If significant excavation or structural work happens very close to a shared boundary wall, the Party Wall etc. Act can come into play in some circumstances, though ordinary garden decking rarely triggers it. The practical point is to keep your structure on your own land and not depend on a boundary you may not own.

Privacy, neighbours and avoiding disputes

Even where decking is legally permitted, neighbour relations are worth managing. Raised decking that overlooks a neighbour's private space is the most common source of friction, and it can lead to complaints to the council even when the deck is within the rules. A few steps reduce the risk of a dispute:

Keep it low where possible: a ground-level or near-ground deck rarely raises privacy concerns.
Consider screening: trellis, planting or a privacy screen on a raised deck can address overlooking — but screening itself can have height rules near a boundary, so check.
Talk first: letting a neighbour know your plans for a raised deck near the boundary often heads off objections.

Drainage is another courtesy issue: a deck should not channel water onto a neighbour's land. Good design keeps run-off within your own garden.

A conversation prevents most disputes: for a raised deck along a shared boundary, telling your neighbour your plans early is the single most effective way to avoid an objection or a complaint to the council later.

Covenants, protected areas and getting certainty

Two further things can restrict decking near a boundary regardless of planning law. Restrictive covenants in your deeds may limit garden structures or what can be built near a boundary, and these are separate from, and additional to, planning rules. Leasehold properties may have similar restrictions in the lease.

Protected settings tighten the rules: in a conservation area, National Park or Area of Outstanding Natural Beauty, permitted development rights are restricted, and for listed buildings they are largely removed, so decking near a boundary in these settings should be checked carefully. Because boundary rules combine planning, ownership and private agreements, the safest course before building a raised deck close to a neighbour is to confirm the planning position with your local planning authority, check your deeds for covenants and boundary ownership, and speak to your neighbour. A Lawful Development Certificate can give formal certainty that a deck is permitted development.

Drainage and water onto a neighbour's land

One boundary issue that catches people out is water. A deck changes how rainwater moves across the ground beneath and around it, and a deck built hard against a boundary can end up channelling run-off onto a neighbour's land — a common source of complaint even where the deck itself is perfectly legal. Good design keeps the deck's drainage within your own garden:

Keep the board gaps and ground beneath free-draining so water soaks away on your side rather than running off to one edge.
Avoid building up the ground level against a boundary in a way that directs water next door.
On a raised deck near a boundary, think about where water shed from the structure ends up.

This matters most where decking replaces lawn or borders that previously absorbed rainfall, since hard or raised surfaces shed more water than the ground they cover. Considering drainage at the design stage avoids a dispute that is far harder to resolve once the deck is built.

Keep your water on your side: a deck built against a boundary can channel rainwater onto a neighbour's land — a frequent cause of complaints — so design the drainage to keep run-off within your own garden.

A sensible order before building near a boundary

Because decking near a boundary touches planning, ownership, private agreements and neighbour relations all at once, working through them in order keeps things clear. A practical sequence is to:

Check the planning position: is the deck within the 30cm height and 50% coverage limits, and is your home in a conservation area, a National Park, or listed, or subject to an Article 4 direction? Confirm with your local planning authority if a raised deck overlooks next door.
Check ownership and your deeds: establish which boundary is yours and look for restrictive covenants or lease terms that limit garden structures.
Keep the structure self-supporting on your own land, not relying on a fence you may not own.
Talk to your neighbour early about a raised deck along a shared boundary.
Design the drainage so run-off stays in your garden.

Most low decks near a boundary are straightforward and need none of this to become a problem. It is the raised deck close to a neighbour — overlooking, fixed near a shared fence, or shedding water — that benefits most from these checks. A short conversation and a confirmed planning position before building usually prevent the disputes that are otherwise hard to undo afterwards.

Frequently asked questions

How close to the boundary can decking be?

There is no single fixed distance. Low decking — no more than 30cm above ground and within the 50% garden coverage limit — is usually permitted development wherever it sits, including near the boundary. The bigger issue is height and overlooking: a raised deck close to a boundary that looks into a neighbour's garden may need planning permission.

Can I attach decking to my neighbour's fence?

Not without agreement. The boundary fence may belong to your neighbour or be jointly owned, so you should not assume you can fix decking, posts or a balustrade to it. Keep the deck self-supporting on your own land, check your deeds for boundary ownership, and speak to your neighbour before building along a shared boundary.

Does raised decking that overlooks a neighbour need permission?

Often, yes. Raised decking usually exceeds the 30cm permitted development height limit, and overlooking a neighbour's garden or windows raises a privacy concern that is a common reason planning permission is required. Screening, keeping the deck lower, or talking to the neighbour early can all help — but check with your local planning authority.

Sources & further reading

Figures on this page are typical UK ranges drawn from published sources and depend on your specific garden. They are guidance, not a quotation.