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How to build a timber garden arch

By Bunnings magazine / Sep 2026

Outdoor garden arch with pink flowers and foliage in front of a dining table, with a paved patio and grassy lawn

Overview

This D.I.Y. timber garden arch structure is designed to create a welcoming entry to your outdoor celebrations. Adorned with flowering climbing plants, it offers a beautiful spring display for any occasion, from an engagement celebration to a special birthday lunch for Nan. 

We used fresh camellia cuttings to supplement potted plants, but a profusion of any flora – real or faux – will look equally gorgeous. The structure can be dismantled and stored until the next occasion, or all the components can be reused elsewhere in the garden.

Tip: Always wear the appropriate safety equipment (safety glasses, gloves, ear muffs and a mask, for example) and always follow the instructions for the product or equipment.

A drill using a nut setter to secure hex head screws into a timber frame

Steps

  1. 1

    Assemble the frame

    Cut merbau posts to 2185mm long using a handsaw, keeping two offcuts as braces. Sand cut edges. Set out the posts with a brace between each pair, 300mm up from the base of the feet, predrill with a 4.5mm bit and secure with 65mm hex head screws using a nut setter. Butt posts against the lattice, flush with the edges; predrill through the top and secure with 65mm screws.
    D.I.Y. - Extra02 - How to build a wooden garden arch – Eunice Oh.jpg
  2. 2

    Reinforce with brackets

    Position angle brackets inside the top corners; predrill through the holes with a 3mm bit and secure with 15mm button head screws

    Note: The screws will protrude slightly through the top of the lattice but are not visible. Move the frame into position and anchor the posts (see ‘How to anchor the garden arch’ below for options).

    A gloved hand guiding a plant stem onto a trellis.
  3. 3

    Plant the climbers

    Half-fill two troughs with potting mix and centre them between the end posts. Position the base of a wire trellis in each, using garden ties to secure to the posts and braces. Plant climbers in each trough, threading stems upwards through the frame.
    Potted plant with purple and white flowers at the base of a wooden arbour, surrounded by grey pebbles
  4. 4

    Add finishing touches

    Fill out the troughs with potted colour under the climbing plants. Backfill with potting mix and water in well. Pile decorative pebbles around the feet of the posts to disguise your chosen anchors.
    Outdoor garden arch with pink flowers and foliage in front of a dining table, with a paved patio and grassy lawn
  5. 5

    How to anchor the garden arch

    • If installing on a paved or concrete surface (such as a patio or courtyard), place the base of each post into the core of a half besser block, adjusting them so the posts sit in a corner against the sides. Predrill from the outside of the blocks using an 8mm masonry bit with the drill set on hammer action. Secure two 8G x 60mm galvanised removable masonry anchor screws through each side.
    • For placement on lawn or in garden beds, use a spirit level to help position the assembled arbour, then drive a 450mm star picket into the ground alongside each foot with a sledgehammer. Secure through the picket holes with galvanised button-head timber screws.
    • To anchor the assembly directly to a concrete slab or concreted pavers (with permission if you’re renting), use galvanised angle brackets, 60mm galvanised removable masonry anchor screws and galvanised button-head timber screws.

    Keep in mind...

    • When using power tools, always protect ears and eyes with ear muffs and safety glasses (gloves and mask are also recommended), follow the manufacturer’s instructions and work in a well-ventilated area.
    • This pop-up structure is not designed for use in areas prone to high winds or for climbing. Supervise children around the arbour at all times.
      Take care when selecting your plants, as some can be poisonous to children and pets.

    Looking for more ideas for a garden party?

    Check out our article on how to make a welcome sign for guests.

     

    Photo credit: Adian Lander, Eunice Oh 

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Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.