Bird Proofing: What You Need to Know

Bird Proofing a Shed in New Zealand: What You Need to Know

Birds nesting or roosting inside a shed can create ongoing problems for farms, businesses, workshops and residential properties. Droppings, feathers and nesting materials can contaminate stored goods, affect machinery, block gutters and create significant cleaning and maintenance requirements.

The good news is that there are several effective bird deterrent and exclusion options available in New Zealand. These include thoughtful shed design, metal vermin flashings, bird brushes, netting, spikes, electronic systems and newer technologies such as the O3 ozone bird repeller.

However, it is important to start with an honest expectation:

Can a shed be made completely bird-proof?

No shed can be guaranteed to remain 100% bird-proof in every situation.

Birds are persistent and highly adaptable. Small species can enter through surprisingly narrow openings, while frequently opened roller doors, sliding doors, ventilation points and changes made after construction can create new access opportunities.

You may see buildings marketed as “bird-proof”, but this wording should be treated carefully. Even well-designed buildings can experience bird activity when doors are left open, deterrents are damaged, maintenance is overlooked or birds discover a new entry point.

Occasionally, online discussions about supposedly bird-proof buildings also include reports of birds getting inside. This does not necessarily mean the building or deterrent system has failed. It demonstrates why an absolute guarantee can be difficult to support in a working farm, industrial or residential environment.

At Wide Span Sheds, we prefer to provide practical, transparent advice. The more accurate goal is to make your shed significantly harder and less attractive for birds to enter, perch, roost or nest in.

The best results usually come from combining good building design with one or more targeted bird-management systems.

Quick answer: What is the best way to deter birds from a shed?

The most effective approach depends on:

• The species of bird

• Whether the birds are entering, perching or nesting

• The size and purpose of the shed

• How often the shed doors need to remain open

• Whether food, grain, seed, stock feed or water is present

• The height and accessibility of the problem areas

• Hygiene requirements for the building

• The surrounding environment

• Whether the shed is being designed or is already built

For a new shed, reducing potential access and nesting areas during the design stage is usually the best starting point. For an existing shed, a combination of exclusion, deterrence and good site management may be required.

Why is bird control important in sheds?

Bird activity can affect much more than the appearance of a building.

Hygiene and contamination

Droppings, feathers, parasites and nesting material can contaminate floors, stored products, vehicles, machinery, animal feed and work areas. This is particularly important in agricultural buildings, food-storage facilities and other environments with strict hygiene requirements.

Damage to coatings and equipment

Accumulated bird droppings can retain moisture and may damage paint, protective coatings and other finishes if they are not removed. Droppings can also collect on vehicles, tools, machinery, shelving and electrical equipment.

Blocked gutters and drainage

Nesting materials can obstruct gutters, downpipes and drainage systems. Over time, this can contribute to overflowing gutters, water entering areas where it should not and additional maintenance.

Fire and electrical risks

Dry nesting material built around lights, wiring or electrical equipment may create an avoidable hazard. Birds may also interfere with wiring or equipment positioned near their nesting areas.

Noise and disruption

Large numbers of birds can create noise, odour and additional cleaning work. Territorial birds may also become aggressive when protecting nests or young.

Ongoing maintenance costs

Once birds establish a regular roosting or nesting site, they can be difficult to move. Preventing access early is generally easier and more cost-effective than managing an established population later.

Bird Deterrent and Exclusion Options Available in New Zealand

There is no single solution that suits every shed. Below are the main bird-control options available in New Zealand and where each may be most useful.

1. Bird-conscious shed design

Bird management should ideally be discussed during the planning and design stages of a new shed.

Design considerations may include:

• Reducing unnecessary openings and gaps

• Closing off accessible eaves where appropriate

• Selecting durable flashings around likely entry points

• Minimising sheltered ledges and nesting pockets

• Planning ventilation so it can be screened if required

• Considering how frequently large doors will remain open

• Positioning feed, waste and water away from the building

• Allowing for future installation and maintenance of deterrent systems

A shed still needs to function correctly and meet ventilation, access and Building Code requirements. The objective is therefore to reduce opportunities for birds without compromising the intended use or performance of the building.

2. Metal vermin flashings

Metal vermin flashings can help close gaps around the building where birds, rodents and other pests may otherwise enter.

Metal is generally a more durable option than lightweight plastic products and is well suited to agricultural and industrial environments. Correct detailing and installation are important because birds may exploit even small gaps left at joins, corners or penetrations.

Flashings are especially valuable when they are incorporated during construction rather than added after birds have already established nesting sites.

3. Bird brushes

Bird brushes use dense, flexible bristles to obstruct openings or make areas unsuitable for birds to enter or settle in.

They may be used around:

• Door tracks

• Roof or wall gaps

• Gutters

• Sliding-door openings

• Gates

• Irregular gaps where solid flashing is not practical

Bird brushes are useful because they can accommodate some movement while continuing to block access. They must be correctly sized and regularly inspected, particularly in demanding rural and industrial conditions.

4. Bird netting

Correctly designed and installed bird netting is one of the most effective physical exclusion methods for many sheds, warehouses and covered work areas.

Netting can protect:

• Roof cavities

• Rafters

• Canopies

• Loading areas

• Open-sided bays

• Storage areas

• Specific nesting or roosting zones

The netting material and mesh size should be selected for the bird species being targeted. A mesh intended for pigeons may not exclude smaller birds such as sparrows.

Professional installation is often worthwhile for large areas. Loose, damaged or incorrectly tensioned netting can create gaps and may present an entanglement risk.

5. Bird spikes

Bird spikes prevent birds from comfortably landing on narrow surfaces such as ledges, beams, signs, pipes and roof edges.

They can be useful for a specific and clearly identified perching area, but they do not prevent birds from entering an open shed. Spikes also need to cover the entire usable landing surface. Poorly positioned spikes may simply cause birds to move a short distance to another ledge.

Spikes should be installed and maintained so they do not create a hazard for people, livestock or other animals.

6. Bird wire, pulse-wire and electric track systems

Tensioned bird wire and low-profile pulse-wire or electric track systems discourage birds from landing on protected surfaces.

These systems are generally more discreet than traditional spikes and may suit:

• Rooflines

• Parapets

• Beams

• Signs

• Wide ledges

• Commercial buildings where appearance matters

Specialist design and installation are recommended. The system needs to suit the targeted bird species, the surface and the environmental conditions.

7. Bird-repellent gels

Specialist bird-repellent gels are applied to selected landing areas to discourage birds from settling.

Some products use sensory cues that birds find unpleasant. They can be discreet and useful where netting or spikes would be visually intrusive, but suitability varies by location and bird species.

Gels are not normally a complete shed-exclusion solution. They require correct placement, periodic inspection and eventual renewal. Product instructions should also be followed carefully around food-production areas, animals and frequently handled surfaces.

8. O3 ozone bird repeller

O3 Bird Control is a newer specialist option available in New Zealand. The system introduces carefully controlled ozone gas high into areas such as shed rafters where birds perch and nest.

According to the New Zealand supplier, birds have highly sensitive respiratory systems and find even low ozone concentrations irritating. The system is intended to make elevated nesting and roosting areas unattractive while maintaining ozone levels within the required limits for occupied areas.

Potential applications include:

• Agricultural sheds

• Dairy, goat and pig-farming facilities

• Grain and bulk-storage buildings

• Food-processing environments

• Warehouses

• Supermarkets

• Ports and transport facilities

• Large, open indoor spaces where netting is difficult to install

Unlike netting or flashings, ozone is not a physical barrier. Its role is to discourage birds from continuing to occupy treated areas.

Ozone is also a respiratory irritant for people at sufficient concentrations. Any ozone-based system should therefore be professionally assessed, designed, installed, monitored and maintained for the specific building. The supplier’s site assessment, operating requirements and applicable New Zealand workplace exposure requirements must be followed.

O3 Bird Control states that its system operates at low concentrations, after which ozone breaks down into oxygen without persistent chemical residue. Because every building differs in size, airflow, occupancy and use, suitability should be determined by an experienced provider rather than assumed.

9. Electronic, ultrasonic and acoustic deterrents

Electronic bird deterrents may use:

• Species-specific distress calls

• Predator calls

• Other audible sounds

• Ultrasonic frequencies

• Programmable or changing sound patterns

Results can vary significantly depending on the bird species and setting. Birds may become accustomed to repetitive sounds, particularly when there is no genuine threat associated with them.

These devices tend to work best as part of a broader bird-management programme, with varied placement and settings, rather than as the only control measure.

Consider the possible effect of audible systems on employees, neighbours, livestock and working animals before installation.

10. Laser bird deterrents

Automated or handheld lasers can be used to move birds away from large areas. Birds interpret the moving light as a physical threat and leave the area.

Laser systems may suit:

• Large warehouses

• Processing facilities

• Covered yards

• Agricultural buildings

• High rafters

• Areas where physical exclusion is impractical

Their effectiveness can depend on lighting conditions, bird species and the layout of the building. Lasers must be installed and operated responsibly to avoid risks to people, vehicle operators, aircraft and animals.

11. Visual deterrents and bird scarers

Visual bird deterrents include:

• Reflective tape

• Moving reflective devices

• Predator-shaped kites

• Hawk or owl models

• Balloons and scare-eye devices

• Rotating or wind-driven scarers

These are relatively inexpensive and easy to install. However, birds often become accustomed to stationary or predictable devices.

For better results, visual deterrents should be regularly moved, changed and combined with other methods. They are usually better suited to short-term or low-level bird pressure than an established indoor nesting problem.

12. Doors, screens and strip curtains

The best way to reduce entry through a doorway is to minimise the amount of time it remains open.

Depending on the building’s use, practical options may include:

• Automatic or fast-closing doors

• Self-closing personnel doors

• PVC strip curtains

• Flexible mesh screens

• Air curtains

• Internal separation between work and storage areas

• Operational procedures for keeping doors closed

These options can be particularly useful for busy commercial or agricultural buildings where large doors must open regularly.

Any system must still allow safe movement of people, vehicles, machinery and livestock.

13. Habitat, food and water management

Bird control is less effective if the site continues to provide easy access to food, water and nesting material.

Helpful practices include:

• Cleaning up spilled grain and stock feed

• Using sealed feed-storage containers

• Covering waste bins

• Removing standing water where practical

• Repairing leaking taps and troughs

• Clearing abandoned nesting material when legally and safely permitted

• Keeping vegetation around entrances managed

• Cleaning droppings and old nesting sites

• Avoiding outdoor feeding of pest birds

• Maintaining gutters, downpipes and roof areas

Good housekeeping will not exclude birds on its own, but it can make the shed far less attractive to them.

14. Trapping, population control and specialist pest management

Where birds have formed a large or persistent population, exclusion and scarers may not be sufficient on their own.

Professional bird-control companies may recommend trapping or other population-management methods. These services should only be carried out by appropriately experienced operators and in accordance with New Zealand animal-welfare, firearms, pest-management and wildlife requirements.

Not every bird found in or around a shed can be treated in the same way. Native and protected species may require specialist advice or authorisation. If you are unsure which species is present, seek professional guidance before disturbing nests, trapping birds or undertaking lethal control.

Which bird deterrent is best for your shed?

Should bird deterrents be installed during construction?

Where possible, yes.

Including bird-deterrent measures during the design and construction process can be more efficient than retrofitting them later. It allows potential gaps, ledges, ventilation points and access requirements to be considered before the shed is built.

However, specialist deterrent products must still be selected for the building’s purpose and the bird species present in the area. Some systems may be installed by a specialist bird-control provider after the shed structure is complete.

Can birds still enter a new shed?

Yes. A new shed may have fewer gaps and better exclusion details, but birds can still enter through open doors, vents, damaged components or later building modifications.

This is why “bird-resistant” or “designed to reduce bird access” is more realistic than promising a completely bird-proof building.

Regular inspections are important, particularly during nesting seasons or after storms, building work and equipment installations.

What should you do if birds are already nesting in your shed?

Do not immediately seal every exit while birds, eggs or chicks may still be inside.

Instead:

1. Identify the bird species if possible.

2. Locate the main entry, nesting and roosting points.

3. Check whether active nests, eggs or chicks are present.

4. Seek advice if the species may be native or protected.

5. Remove contamination using appropriate hygiene precautions.

6. Install exclusion measures at the correct time.

7. Monitor the building for alternative entry points.

8. Add further deterrents if birds begin using a different area.

Established birds may repeatedly return to a familiar site, so professional help may be required for persistent infestations.

Frequently Asked Questions About Bird Proofing Sheds

Are Wide Span Sheds bird-proof?

No shed should be described as completely bird-proof in every operating environment. Wide Span Sheds can discuss building features that may help reduce access and nesting opportunities, but doors, ventilation, building use, maintenance and site conditions all influence the outcome.

What is the most effective bird deterrent for a shed?

Physical exclusion through correctly installed flashings, brushes, screens or netting is often the strongest starting point. Large or complex sites may benefit from combining physical exclusion with electronic, visual, laser or ozone-based systems.

Does bird netting work in sheds?

Yes. Professionally designed and correctly installed netting can be a highly effective long-term physical barrier. The mesh size, material and installation must suit the bird species and the building.

Can bird spikes keep birds out of a shed?

Bird spikes discourage landing on specific surfaces, but they do not stop birds flying through an open door or another gap. They are best used as one part of a broader strategy.

Does ozone deter birds?

O3 Bird Control states that low, controlled ozone concentrations deter birds from nesting and roosting in treated indoor areas. Because ozone is a respiratory irritant, the system requires professional design, monitoring and operation appropriate to the building and its occupants.

Will ultrasonic bird deterrents work?

They may help in some situations, but performance varies between species and environments. Birds can become accustomed to repetitive deterrents, so ultrasonic or acoustic systems are generally more effective when combined with exclusion and good site management.

How much does bird proofing a shed cost?

Cost depends on the shed’s size, height and layout, the species involved, the severity of the activity and the selected system. Closing several small gaps may be relatively straightforward, while netting a large warehouse or installing an automated deterrent system requires a specialist assessment.

How often should bird-control systems be checked?

Inspect them regularly and after high winds, storms, construction work or changes to the building. Netting, brushes, flashings, spikes and electronic systems can all become damaged or obstructed over time.

Plan Bird Deterrence into Your Wide Span Shed

The most effective approach to bird management is realistic, site-specific and proactive.

While no shed can be guaranteed to remain completely bird-proof, careful design and a combination of exclusion, deterrence and site management can substantially reduce the likelihood of birds entering, roosting and nesting.

When planning your Wide Span Shed, talk to our team about:

• How the building will be used

• Whether feed, seed, food or valuable equipment will be stored inside

• How frequently the doors will remain open

• Known bird activity in the area

• Potential exclusion and flashing options

• Whether a specialist bird-control assessment may be beneficial

Our team can help you plan a shed that suits your site, storage needs and day-to-day operation while considering practical ways to reduce bird access.

Ready to start planning your new shed? Contact Wide Span Sheds for a free quote and expert advice. Call 0800 WIDE SPAN or request a quote online.

Bird-deterrent products and specialist control systems should be assessed for each site. Wide Span Sheds does not guarantee that any building or deterrent measure will completely prevent bird access. Product performance, workplace safety, wildlife protection and regulatory requirements should be confirmed with the relevant specialist provider.