Bird spikes solutions for window sills

More often than not the Defender range of bird and pigeon spikes is the most effective bird spike solution for persistent birds on window sills.

The problem is ...

I need an effective, humane bird spike solution to stop birds from perching on window sills between 1" to 8" (25mm-300mm) in width causing soiling problems.

The most effective humane solution is ...

The most effective bird spike solution to stop birds landing on window sills and ledges is to install strips of bird spikes.

Manufactured by Jones and Son these spikes are ideal for use on window sills with depths of between 1 and 8 inches (25mm to 300mm). Each strip has an overall length of just over 13" (337mm). The Defender™ range of bird and pigeon spikes come in three sizes and effectively deter even the heaviest infestation of birds:

  • The Defender4™ Pigeon Spike (plastic spikes) and the Defender4™ Bird Spike (steel spikes) are suitable for sills with a depth of 1 to 4 inches (25-100mm).
  • The Defender8™ Pigeon Spike (plastic spikes) and the Defender8™ Bird Spike (steel spikes) are suitable for sills with a depth of 4 to 8 inches (100-200mm).
  • The Defender12™ Bird Spikes (steel spikes) are suitable for sills with a depth of 8 to 12 inches (200-300mm).
  • The Defender™ Plastic Pigeon Spikes are made from super tough durolon UV stablised polycarbonate. Product warranty is 10 years.

    The Defender™ Steel Bird Spikes are made from stainless steel 304 grade pigeon wires which protrude from a super tough Durolon polycarbonate base. They are slightly less visible when in situ than the plastic spikes with a product warranty of 12 years.

Where can I buy it?

What's the best way of fixing the bird spikes?

  • Before starting the job, assess the work to make sure that you can do it safely and without hurting yourself or others. If you have any doubts at all then please contact a specialist. Wear suitable protective clothing, dust mask, gloves, overalls etc.
  • All areas should be prepared ensuring they are clean, dry and free from bird droppings. Check above the sills as the source of the mess may actually be from sills or pipes higher up on the building. If this is the case you will need to spike these as well because if this is not done, then droppings, twigs etc. may fall down onto the bird spikes below rendering them less effective.
  • Squeeze bird spike fixing silicone generously onto the base of the spike, about (10mm) the size of your finger. Thicker if the sill is uneven.
  • Stick the first row of bird spikes towards the front of the sill, so that the spikes fully protect the leading edge. Press down firmly so the glue oozes out through the little holes. If the gap behind the 1st row is greater than 2 inches (5cm) birds may get in behind. It is therefore necessary to install another row of spikes into this space to block it. For very wide sills 3 or more rows of spikes may be required remembering to leave no more than 2 inches (5cm) between rows.

    Every effort should be made to spike all possible landing sites that are 2 inches (5cm) or greater. Snap spikes into pieces to finish off rows or spike small areas. Spikes can be easily snapped using your fingers.

  • Always make sure that the base of the bird spikes are fixed directly onto the top of any parts of the sill that may be raised slightly higher than the rest of the sill. If this is not done then birds will overcome any spikes on lower parts by standing on the raised section. Spike the highest part of the sill first then move on to spike the lower sections afterwards.
  • Important note : bird spikes will stop birds from sitting on a sill; however if there is a hole in the eaves or a cavity in the exterior wall behind the spikes, birds will force their way past the spikes in an effort to get into that hole. Simply putting a spike in front of a hole will not stop the bird. Every effort should be made to block the access to this hole or space. You might be able to seal the hole with wire mesh or expanding foam.

    Before blocking the hole you should ensure that birds have not become trapped in the recess. If you do discover any bird squabs or dependent birds please contact your local wildlife rehabilitator which can be found here.

  • A word of warning : scaffolders, window cleaners, painters, contractors on ladders etc. can often damage bird spikes. Ask them to be careful whilst working as a slightly damaged spike can provide an ideal nesting or roosting spot for a bird. Any damaged spikes should be replaced before birds have a chance to move in.