Turn your garden into a proper outdoor room — no experience necessary
There's something about a pergola that transforms a garden. One weekend it's just a patio. The next, it's a shaded outdoor room where you actually want to spend time — with a cup of tea, a glass of something cold, or the whole family on a sunny Saturday afternoon.
The good news? A simple pergola is one of the most achievable weekend builds a beginner can take on. You don't need a workshop full of tools or years of experience. You need decent timber, a clear plan, and a free weekend. Here's everything you need to know to get started.
What Is a Pergola, Exactly?
A pergola is essentially an open timber frame structure — four upright posts, a couple of horizontal beams running across the top, and a series of rafters or slats spanning between them. It creates a defined space in your garden without fully enclosing it, which is exactly why they feel so good to sit under.
They can be freestanding in the middle of a garden or fixed against the back of a house. For a first build, freestanding is simpler — you're not dealing with wall fixings or damp-proofing against brickwork.
What Timber Should You Use?
This is where we can help. For a garden pergola, you want pressure-treated softwood — it's been treated to resist rot, insects and weathering, which means it'll last for years outdoors without constant maintenance.
Here's a simple timber list for a standard 3m x 3m pergola:
- 4 x upright posts — 100mm x 100mm, at least 2.7m long (you'll be sinking part of these into the ground or into post supports)
- 2 x main beams — 150mm x 50mm, cut to your width (around 3.2m to allow a small overhang)
- 5–6 x rafters — 100mm x 50mm, spanning the length at roughly 500–600mm centres
- Post fixings or metal post supports — if you're using ground anchors rather than concrete, these are a brilliant beginner-friendly option
All of this is available treated and ready to go from our yard. Just tell us your dimensions and we'll help you work out quantities.
Tools You'll Need
Nothing exotic here:
- Tape measure and pencil
- Post hole digger or a mallet if using metal post spikes
- Drill with long wood bits and a screwdriver bit
- Spirit level (non-negotiable — a wonky pergola is a sad pergola)
- Saw for any trimming
- Decking screws or structural timber screws — stainless steel if possible, to avoid rust marks down the wood over time
Step-by-Step: How to Build It
Step 1 — Mark out your footprint
Use four canes and some string to mark the corners of your pergola on the ground. Check it's square by measuring diagonally corner to corner — if both diagonal measurements match, you're square. This step is worth doing slowly.
Step 2 — Set your posts
For a beginner, metal post spikes knocked into firm ground are the easiest option. Drive them in with a sledgehammer using a scrap piece of timber to protect the socket, then drop your posts in and tighten. Check each one is plumb (perfectly vertical) with your spirit level before you move on.
If you prefer a more permanent fix, dig holes around 450–600mm deep, set the posts in and pack with postcrete. Give it 24 hours to set before you continue.
Step 3 — Fix the main beams
The two main beams run across the top of your posts, connecting each pair. Fix them with structural screws driven at an angle through the beam into the post (called toe-screwing), or use timber frame connectors from a hardware store for a cleaner finish. These beams can overhang slightly beyond the posts — 150–200mm each side looks good and softens the whole structure.
Step 4 — Add the rafters
The rafters span between your two main beams, running the other direction. Space them evenly — around 500mm apart works well. Notch them slightly to sit over the beams if you want a traditional look, or simply screw them down flat on top. Either works for a beginner build.
Step 5 — Finishing touches
Sand any rough edges, particularly anywhere at head height. You can leave pressure-treated timber to weather naturally to a silver-grey, which looks great after a season. Or apply a good exterior wood stain or decking oil to keep the warm timber colour. We stock a range of finishes in the yard if you'd like advice on what works best.
A Few Things Worth Knowing
Do I need planning permission? Most pergolas don't require it, but if you're attaching to a listed building or your garden is in a conservation area, it's worth a quick check with your local council first.
How long will it take? A first-time builder with a helper can realistically have a freestanding pergola standing in a day. Allow a second day for finishing, staining, and tidying up.
Can I make it bigger? Absolutely — just add more posts and extend your beams and rafters. The same principles apply whether you're building 2m x 2m or 4m x 4m.
Come and Talk to Us First
Before you buy a single piece of timber, come into the yard or give us a call. We've been helping people build things since 1856, and one of the things we genuinely enjoy is talking through a project with someone who's never done it before.
We'll make sure you've got the right sizes, the right treatment, and the right quantities — so there's no wasted timber and no mid-build trip back to the merchants.
Happy building. ☀️
