Trellis Panel Calculator
Ordering too few trellis panels means a delayed job waiting on another delivery, while ordering too many wastes money on materials you won't use. Enter the length you need to cover and your panel width below to get a straightforward panel and fixing count.
Work out how many trellis panels you need
Enter the length of boundary or wall you want to cover and your panel width.
Standard 6ft panels are 1.83m wide.
To cover 6m, you'll need:
4 trellis panels
Plus around 16 fixings (brackets or screws), allowing 4 per panel. Buy a few extra fixings in case any get damaged during fitting.
Recommended products
A few well-reviewed trellis and fencing options.
- Wood
£99.99
Pros
- Expandable design fits multiple garden layouts
- 3 adjustable heights for flexible screening
- Freestanding — no fixing into the ground required
Cons
- Solid wood needs occasional weatherproofing treatment
- Plastic
£59.99
Pros
- Artificial willow resists rot and needs no treatment
- UV-stable colour will not fade in sunlight
- Expands to cover a 1m x 2m area
Cons
- Less natural look than real willow
- Wood
£317.98
Pros
- Heavy-duty overlapping 8mm boards for privacy and security
- Dip-treated with 10-year anti-rot guarantee
- Reinforced with central battens for strength
Cons
- Posts and gravel boards sold separately
- Heavy — needs two people to install
Frequently asked questions
How do I measure the length I need to cover with trellis?
Measure along the base of the wall or boundary in a straight line, in metres, including any short returns or corners as separate sections if the run changes direction.
What is the standard size of a trellis panel?
Most trellis panels sold in the UK are 6ft wide, which is 1.83m, though you will also find narrower panels for smaller gaps, so it is worth checking the exact width before you order.
How many fixings does a trellis panel need?
As a general guide, allow four fixings per panel, usually brackets or heavy-duty screws at each corner, though taller or heavier panels in exposed spots may need extra support.
Should I round up if a panel doesn't fit exactly into my measurement?
Yes, it's best to round up to the next whole panel and either trim the final panel to size or overlap slightly, rather than leaving a gap at the end of the run.
How this calculator works
The calculator begins by requesting the total length of your wall or boundary in metres. This is the primary factor determining how many panels you’ll need to cover that length. It then prompts for the desired height of the trellis panel, which directly impacts the number of panels required – taller walls necessitate more vertical coverage. Finally, you specify the spacing between each panel; a closer spacing provides greater support for climbing plants but increases the overall quantity of fixings needed.
Trellis Panel Sizes and Typical Uses in the UK
- **Standard Trellis Height:** Most commonly available trellis panels are 1.8m high, suitable for most climbing plants like roses and clematis. Consider shorter panels (e.g., 1.2m) for smaller spaces or when supporting less vigorous climbers.
- **Panel Widths:** Panels typically come in widths of 60cm, 90cm, or 120cm – choose based on plant spacing requirements and aesthetic preferences. Wider panels may be beneficial for larger climbing plants like pumpkins or squash.
- **Trellis Type & Support:** Pressure-treated softwood is the most common material in UK garden trellis, generally priced between £15 - £35 per panel. Metal options are available but can be more expensive (around £25 - £60+). Consider your plant’s growth habit when selecting support types.
- **Fixing Spacing:** A spacing of 60cm to 90cm is typical for most climbing plants, providing sufficient support without overcrowding. Closer spacing (e.g., 45cm) might be necessary for vigorous climbers like honeysuckle or wisteria.
- **Boundary vs Wall:** For walls, a tighter panel spacing can be used due to increased structural support. When installing on boundaries, consider prevailing winds – wider spacing may improve stability and reduce the risk of panels being blown over.
Worked example: Calculating Trellis Needs for a 10m Boundary
Let’s say you're planning a 10-metre boundary wall and want to install trellis panels 1.8m high, spaced 90cm apart. Inputting these values into the calculator yields a recommendation of 6 panels. This calculation is based on dividing the total length (10m) by the spacing between panels (0.9m), which results in approximately 11.1 panels – rounding up to 6 ensures sufficient coverage, allowing for overlaps and adjustments. The estimated cost would be around £180-£350 depending on panel material and fixings purchased from Amazon UK.
More questions answered
What does ‘spacing’ refer to in the calculator?
Spacing refers to the distance between each individual trellis panel. A smaller spacing means panels are closer together, providing more support for climbing plants but also requiring more fixings. Larger spacings offer less support and may be suitable for lighter climbers.
Should I round up or down when entering my measurements?
It’s always best to round up slightly when entering your measurements to ensure you have enough trellis. Overestimating is better than running out of materials mid-project, particularly if you're purchasing from Amazon UK where returns can be a hassle.
What fixings should I factor into my calculations?
The calculator focuses on panels but you’ll also need to account for fixings like brackets, screws and clips. These are typically priced around £10-£30 depending on the quantity and type – ensure you include this in your overall budget.
Can I use this calculator for a curved wall?
While the calculator is primarily designed for straight walls and boundaries, you can still use it as a starting point. You’ll need to break down the curve into smaller, straighter sections and calculate the trellis requirements for each section individually.
What if my wall isn't perfectly straight?
Allow extra length on your measurements – adding 10-20cm can provide a buffer for minor irregularities. It’s always better to have slightly more than you need when working with materials from Amazon UK.
Are the trellis panel sizes standard across the UK?
While there are common sizes, variations exist. Always double-check the dimensions of specific panels before purchasing from retailers like Amazon UK to ensure they fit your space and requirements.
What’s the best material for UK garden trellis?
Pressure-treated softwood is a popular choice in the UK due to its cost-effectiveness and durability. However, metal options offer greater longevity but are generally more expensive – consider your budget and plant needs.
How do I calculate the number of fixings needed?
The calculator estimates the quantity of panels based on length. You'll need to multiply the number of panels by the number of fixings required per panel (typically 4-6) to determine your total fixing requirement.
I’ve used the calculator but I’m still unsure – what should I do?
Consult with a local garden centre or experienced gardener for advice. They can assess your specific site conditions and recommend suitable trellis solutions, considering factors like wind exposure and plant growth habits.
Can I adjust the spacing between panels after calculating the number of panels needed?
Yes, you can! However, reducing the spacing will increase the number of panels required. It's best to stick with the recommended spacing unless you’re prepared for a more complex installation and potentially higher costs from Amazon UK.