How to Stop Birds Perching on a Pergola (and Messing on the Patio Below)

To stop birds perching on a pergola, fit deterrent spikes along the top face of every beam and rafter they land on, and remove whatever is drawing them in (spilt seed, open food waste, a handy nearby roof). Birds choose pergolas because the beams give a raised, flat, sheltered perch with a clear view. Make the top surface unusable and they move on to somewhere else.

Why do birds keep landing on my pergola?

A pergola ticks every box for a pigeon, gull or crow: it is higher than the surrounding fences, the beams are flat and wide enough to stand on, and any climbing plants or a slatted roof give shelter from rain and wind. If the pergola sits over a patio table, the mess lands exactly where you don't want it.

Before you fit anything, spend a day or two watching:

• Which beams do they use? It's usually the outer rafters and the cross-beam closest to the house or a tree, not every beam equally.
• Where do they come from? A neighbouring roof ridge, a bird feeder or a tree is often the staging post.
• What are they doing there? Short visits to survey the garden are perching. Carrying twigs means nest building, which changes what you can legally do (see below).

What should I do first, before fitting anything?

The free steps are worth doing, because they reduce how badly the birds want the spot:

1. Clean the beams and patio thoroughly. Droppings attract more birds back to the same spot. Wear gloves and a mask, wet the droppings first to avoid raising dust, and wash with hot soapy water or a patio cleaner.
2. Remove easy food. Sweep up spilt seed, move bird feeders well away from the pergola, and keep bins and pet food bowls covered.
3. Move or shield the table. A parasol or an outdoor rug under the beams makes cleaning easier while you work on the longer-term fix.
4. Check for an active nest. If birds are building or sitting on eggs or chicks, leave them alone. In the UK it is an offence to intentionally damage or destroy an active nest. Wait until the young have fledged, then fit your deterrents. Our guide to whether bird spikes are legal in the UK covers the rules.

Which parts of a pergola need deterrents?

Only the places birds can stand. On most timber or metal pergolas that means:

• The top of each rafter or slat. This is the main perch.
• The top of the main cross-beams that sit across the posts.
• Post tops, if they end in a flat cap above the beams.
• Any horizontal trellis rail or end board along the front edge, where birds like to line up.

You don't need to cover the sides or undersides of the beams. A bird has to stand on the top surface, so that is where the spikes go. Leave the shaded underside alone unless birds are roosting there, in which case see our guide to stopping pigeons perching above a front door, which uses the same ledge-by-ledge approach.

Do spikes work on narrow pergola rafters?

Yes, as long as they suit the width of the beam. Rafters are often narrow, which is where flat single-height spikes tend to fail: a bird can find a gap between rows and still land. An irregular-height design is harder to stand on because there is no consistent level to settle on.

ThornGuard strips have three staggered heights (12mm, 22mm and 36mm), so there's no flat patch for a bird's feet. The strip can also be split lengthways, which suits narrow rafters and means one pack covers roughly three times the length. A 4m pack can stretch to up to 12m of narrow beam, which is enough for four 3m rafters. If a strip is wider than the beam, split it lengthways rather than letting it overhang. Our guide to cutting bird spikes to size shows how.

How do I fit spikes to a pergola?

The method depends on what the pergola is made from.

Timber pergola

1. Measure the length of each beam you want to cover, and write the lengths down.
2. Cut or split the strips to length, working from the longest beam down so you waste less.
3. Lay the strip along the centre of the top face, with the spikes pointing up and the base flat on the wood.
4. Fix with the screws supplied, one every few spikes, and make sure the strip sits flat with no lifting corners.
5. At the ends, trim the strip flush with the beam so there's no tail a bird can perch on.

Aluminium, powder-coated or composite pergola

Don't drill into powder-coated metal if you can avoid it, because chips in the coating can let corrosion start. Use waterproof adhesive pads (sold separately) or UV-resistant cable ties around the beam instead. Clean the surface with a damp cloth and let it dry fully before pressing the pads on. Our guide to fixing bird spikes without drilling covers what holds best on each surface.

Where the strip meets a corner or post

The strip bends four ways and folds along its length, so it can wrap over a post top or around the end of a beam without gaps. Leaving a bare corner just gives birds the one spot they'll use.

What if birds still land after I've fitted spikes?

Birds are adaptable, so check for these common gaps:

• A missed beam. Birds will shuffle along to the one clear stretch. Cover every beam on the same side.
• A nearby alternative. If a fence top or shed roof next to the pergola is bare, birds may switch to it. Treat the next-nearest perch too.
• Climbing plants. A thick wisteria or vine can hide the spikes and give birds a platform over them. Prune back so the strip is exposed.
• Debris. Leaves and twigs can pile up and cover the spikes. A quick sweep each season keeps them effective.

No deterrent is guaranteed on every bird, but covering all the usable perches gives the best chance of the birds moving on.

Should I use netting instead?

Netting can work if you want to stop birds getting under or into a roofed pergola, but it is fiddly to fit and can trap or tangle wildlife if it sags. For simple perching on beams, spikes are neater and need less upkeep. Our comparison of spikes vs netting for pigeons goes through the trade-offs. If you'd like to see the pack sizes, the ThornGuard spikes page has the details, and the fitting guide walks through the install.

Common questions

Will bird spikes damage my pergola?

Screwing into timber leaves only small pilot holes, which are easy to fill if you remove the strips later. On painted or powder-coated metal, use adhesive pads or cable ties so you don't break the coating.

Are pergola spikes safe for birds?

Yes. Deterrent spikes are designed to stop birds landing, not to hurt them, and the blunt-tipped design simply makes the surface uncomfortable to stand on. Our guide on whether bird spikes are humane explains how they work.

How do I stop birds nesting in my pergola?

Fit deterrents before the nesting season, and cover any sheltered flat spots where a nest could sit, such as the tops of the beams and ledges where they join the posts. If a nest is already in use, leave it undisturbed until the chicks have fledged, as active nests are protected by law.