A trellis is a lightweight frame, usually made of wood, metal or plastic, with a criss-cross or lattice pattern that gives climbing plants something to grip as they grow upwards. You’ll usually see one fixed to a fence, wall or freestanding post, holding up roses, clematis or runner beans without them sprawling across the ground. It’s one of the simplest ways to add height, privacy or greenery to a small garden without losing floor space. This guide covers the different types of trellis, what they cost in the UK, which plants suit them, and the planning rules people often get wrong.
What Is a Trellis, Exactly?
A trellis is an open framework, most often square or diamond lattice, designed to support climbing and trailing plants as they grow. The gaps between the slats give tendrils, stems and ties something to hook onto or be fastened to, so the plant grows vertically instead of flopping outward.
Trellis panels are usually flat and attached to a wall, fence or freestanding frame. Unlike a solid fence panel, the open structure lets light and air through, which matters for plant health as well as for keeping a garden from feeling boxed in.
Trellis has been used in gardens for centuries, originally to train grapevines and later adopted across Europe for roses and ornamental climbers. Today it’s just as likely to be doing a practical job, screening a bin store or supporting runner beans, as a decorative one.
Trellis vs Pergola vs Fence Panel: What’s the Difference?
People often mix these three up, so it’s worth being clear.
A trellis is flat, usually vertical, and designed mainly to support climbing plants against a wall or fence. A pergola is a much larger structure with an open roof, typically supported on posts, designed to create a shaded walkway or seating area that plants can grow over. A standard fence panel is solid or close-boarded, built for privacy and boundary marking rather than plant support, though many gardens combine a fence panel with a trellis topper on top.
The confusion usually comes from garden centres selling “trellis fencing,” which is really just a fence panel with a lattice section built into the top few inches.
Types of Trellis
Wooden trellis is the most common choice in UK gardens, usually pressure-treated or dip-treated softwood in a square or diamond lattice pattern. It’s affordable, blends into most garden styles, and takes paint or stain well, though untreated timber will eventually rot without maintenance.
Metal trellis, typically powder-coated steel or wrought iron, suits heavier climbers like wisteria or mature roses that need a sturdier support. It costs more than timber but lasts significantly longer and needs almost no upkeep beyond an occasional wipe-down.
Plastic and PVC trellis is the lightest and cheapest option, useful for temporary supports or renters who don’t want to fix anything permanent to a wall. It won’t rot, but it’s less sturdy under the weight of a fully grown climber and can become brittle in UK winters over several years.
Willow and bamboo trellis gives a more natural, cottage-garden look and works well for lighter annual climbers like sweet peas. It’s the least durable of the four, typically lasting only a few seasons outdoors before it needs replacing.
Common Trellis Sizes and Prices in the UK
Trellis panels are usually sold by width and height in feet, though most retailers now list the metric equivalent too. The most popular size for UK gardens is 6ft wide by 6ft high (roughly 1.83m x 1.83m), often used as a standalone screen or fixed to the top of an existing fence.
At Wickes, a Forest Garden Square Lattice Trellis panel at 1830mm x 1830mm currently costs around £35, while a smaller Diamond Lattice panel at 1830mm x 900mm comes in at around £36. Narrower fence-topper strips, around 1800mm x 300mm, tend to sell for £16 to £20. B&Q stocks similar ranges, often sold in packs of three or five for larger projects, which usually works out cheaper per panel than buying single pieces.
Prices change fairly often and vary by material and finish, so it’s worth checking current listings at Wickes, B&Q or your local timber merchant before budgeting a full project.
Best Plants to Grow on a Trellis in the UK
Not every climber needs the same kind of support, so it helps to match the plant to the trellis type.
- Clematis: a UK garden favourite that clings using its leaf stalks, so it does well on most lattice styles.
- Climbing and rambling roses: need tying in as they grow and suit a sturdier wooden or metal trellis rather than a lightweight plastic one.
- Sweet peas: fast-growing annuals that are ideal for lighter trellis or willow supports, especially in a vegetable patch.
- Runner beans and climbing French beans: a classic UK allotment pairing, usually grown on taller trellis or bean poles for easy picking.
- Honeysuckle and jasmine: both twine naturally around trellis slats and suit warmer, sheltered spots against a south or west-facing wall.
- Wisteria: beautiful but heavy once established, so it needs a strong, well-fixed structure rather than a budget panel.
Do You Need Planning Permission for a Trellis?
Usually not, but there’s a catch that trips a lot of people up. Under the Planning Portal’s permitted development rules for England, you can put up a fence, wall or gate up to 2 metres high without planning permission, dropping to 1 metre if the boundary runs alongside a road used by vehicles.
The important part is that a trellis fixed on top of a fence counts towards that total height. If you already have a 1.8m fence and add a 30cm trellis topper, the whole structure now measures 2.1m, which pushes you over the limit and technically requires permission. Height is measured from ground level on the highest side of a sloping garden, not from your own lower point.
Listed buildings, conservation areas and properties under an Article 4 direction can have tighter restrictions even within the 2m limit, so it’s worth a quick check with your local planning authority if your property falls into any of those categories. A freestanding trellis in the middle of your own garden, not attached to a boundary fence, generally isn’t subject to the same height rule.
How to Install a Trellis
Fixing a trellis properly makes a real difference to how long it lasts, especially in exposed UK gardens.
- Choose your fixing method: expanding trellis brackets let the panel hinge away from a wall for maintenance behind it, while direct screwing is simpler but permanent.
- Mark and drill pilot holes at each corner and along the frame, spacing wall plugs to suit your wall type (brick, render or timber fence post).
- Fix the top brackets or screws first, checking the panel is level with a spirit level before tightening fully.
- Secure the bottom fixings, leaving a small gap (a few centimetres) between the trellis and the ground to reduce rot from soil contact.
- Add plant ties or wire supports if you’re training a heavier climber like a rose or wisteria, since the lattice alone may not hold a mature plant’s weight.
How to Look After a Trellis
Wooden trellis benefits from a coat of wood preservative or fence paint every one to two years, particularly on cut edges where the original treatment has been exposed. Check fixings annually, since UK weather swells and shrinks timber, which can loosen screws over time.
Metal trellis needs far less attention, though it’s worth checking for rust spots on cheaper powder-coated finishes after a few winters. Whatever the material, cutting back overgrown climbers each autumn or late winter stops the weight building up faster than the structure can support.
FAQs
What is the difference between a trellis and a pergola?
A trellis is a flat, usually vertical panel for supporting climbing plants against a wall or fence. A pergola is a larger, freestanding structure with an open roof, designed to create a shaded area rather than just support plants.
What is the best material for a garden trellis?
Wooden trellis is the most popular UK choice for its price and appearance, while metal trellis suits heavier climbers like wisteria or mature roses that need a sturdier frame. Plastic trellis is the cheapest and lightest option but less durable under a fully grown plant.
Do I need planning permission to put up a trellis?
Not usually, but a trellis fixed on top of a fence counts towards the overall height. If your fence and trellis together exceed 2 metres (or 1 metre next to a road), you may need permission, according to the Planning Portal’s rules.
What size trellis panel is most common in the UK?
The 6ft by 6ft panel (around 1.83m x 1.83m) is the most widely sold size, often used as a standalone screen or fixed on top of an existing fence panel.
What plants grow well on a trellis?
Clematis, climbing roses, sweet peas, runner beans, honeysuckle and jasmine are all common UK choices. Heavier plants like wisteria need a stronger metal or reinforced timber trellis rather than a lightweight panel.
How do you attach a trellis to a fence?
Expanding trellis brackets are the most practical option, since they let the panel swing away from the fence for access and maintenance. Direct screwing works too, but makes it harder to reach behind the trellis later.
How long does a wooden trellis last?
A pressure-treated wooden trellis typically lasts 10 to 15 years with occasional re-treatment, based on the guarantees offered by major UK retailers. Untreated or budget timber trellis often needs replacing within 5 years.
Can you use a trellis for vegetables as well as flowers?
Yes, trellis is commonly used for climbing vegetables like runner beans, French beans, peas and cucumbers, not just ornamental flowers. Growing them vertically also makes harvesting easier and keeps produce off damp soil.
