Author Topic: Cat proofing the garden - Give your indoor cat some outside space :)  (Read 29418 times)

Offline Tan

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Cat proofing the garden - Give your indoor cat some outside space :)
« Reply #1 on: June 01, 2007, 17:45:05 PM »
For many people, a major deterrent to having a cat as a pet is the problem of keeping it safe and well without restricting it from leading a normal, happy, outdoor life. However, the problem of keeping an active cat in a safe environment can be solved without necessarily condemning the cat to a life indoors.

Cats which have been kept indoors all their lives adapt reasonably well to their environment provided that they are given ample companionship and attention. However, such an enclosed environment is far from ideal and a solution which permits the cat to have access to a garden as well as the house is preferable.

Safety first   

The advantages of providing an enclosed environment for domestic cats are many. Safety is high on the list but there is also relief from the fear of their being run over, of their causing a problem by digging up the neighbour's best plants, or of their being injured by predators. The need to provide a protected environment becomes more important as the number of hazards rises.

There are two possibilities available to the cat owner. The first of these is to fence the garden, either completely or in part, to prevent the cats from getting out. Such fencing can, with a neighbour's consent, be adapted to prevent outside cats getting in - a solution which may be attractive to owners of gardens full of plants constantly being uprooted by neighbourhood cats. There can, however, be a problem if there are any perimeter trees which overhang such a fence. The presence of such trees will enable the cats to climb on top of the fence and escape into the outside world. Judicious pruning may help, but the problem remains that an active cat can both climb and leap from branch to fence and so escape.

Fencing the trees themselves is a possibility by 'bonnetting' or giving the tree an Elizabethan collar. Trees which pose a problem can be trimmed up to a height of 1.8m (6ft) and made secure by attaching wire mesh, horizontally, under the lowest remaining branches to prevent cats climbing upwards into the trees. Loosely attach a loop of wire around the trunk immediately below the main branches. Attach another loop about 1 metre (3ft 3in) out to the same branches. Stretch the wire mesh between these loops, attaching it at regular intervals to the supporting branches. Where such trees adjoin a fence, the 'bonnet' can be attached to the wiring of the fence, effectively boxing the cats in. Leaves and small branches growing down through the wire soon make such fencing virtually invisible.

However, it must be stressed that, if you live in a designated conservation area or any trees in your garden are subject to a Tree Preservation Order, you must consult the planning department of your local Council before trimming or pruning any trees.

Gardens vary in size and shape and what may be practical for one will not necessarily work in another. Nevertheless, it should be possible to create a safe haven in at least one part of a garden. Problems with neighbours' fences, uneven ground, or overhanging branches will inevitably arise and allowance must be made for these when adapting the following suggestions.

The cat-proof garden   

To make a garden cat-proof will require the creation of a border fence of at least 1.8m (6ft) in height which, in the case of a wooden structure, means uprights of at least 2.3m (7ft 6in) so that there is sufficient length to fix in the ground. These uprights should be at least 8 x 5cms (3in x 2in) and should be placed not more than 1.8m (6ft) apart. It is advisable to ensure all timber below ground level is properly treated with a preservative and that the posts are set in concrete to provide a more rigid structure. An existing brick or stone wall may be used and can be extended to the requisite height with a wooden framework to form the basis for the wiring. The use of trellis sections can improve the appearance of safety fencing and will permit lightweight trailing plants to be trained along it.

It is always wise to discuss plans for a new fence or garden wall with neighbours to ensure that no objections will occur, particularly if there is no existing boundary fence. It is also very important to discuss construction of fences over 2m high (6ft 6 in) with the Council's planning department as planning permission may be required. Permission will definitely be required for any fence or enclosure above 1m (3ft 3in) along a road frontage. In some housing developments there may be legal covenants and/or local restrictions which prevent fencing being erected on either front or side gardens. Whatever the situation, it is always advisable to check with your solicitor, neighbours and the Council's planning officers before incurring the expense of building the new fence.

How it's done   

The actual escape-prevention system needs to be constructed at the top of this 2m (6ft 6in) wall or fence. There are various methods of doing this, using either a fixed framework or brackets and stretcher wires. Likewise, the actual fencing may be rigid or flexible, according to the type of wiring or netting used. A rigid wiring may well out last the softer fruit netting but is easier for the cat to climb. In either case, the basic approach is the same.

Once the fence or wall has been raised to the necessary height, a horizontal section should be constructed, jutting out at right angles into the garden for at least 0.5m (18in - 2ft), thus creating an overhang. Alternatively, this section may be built at an upward angle of 45 degrees. This has a slight advantage in that the cat is less likely to jump on to it from above if there are trees nearby but, since it is easier for a cat to climb, it may require a longer vertical drop down. This drop down should be attached to the garden edge of the horizontal or angled section, to hang parallel to the original wall or fence. It should hang down approximately 0.30m (12in).

Both these sections, the horizontal or angled section and the drop down, may be built of a rigid framework. Alternatively, metal angle brackets can be attached to the wall or fence and stretcher wires run between them to support whatever wire mesh or netting is used.

The framework or brackets should be covered with either welded wire mesh or chicken wire, which should be firmly stapled to the wooden framework or tied to the metal brackets. Wire mesh should be of 16 gauge (1.6mm) and the mesh size not more than 2.5cm (1in). Chicken wire is cheaper than wire mesh but may not last so long. It should also be of 2.5cm (1in) mesh. The use of a larger mesh may permit a small cat, an Oriental or a kitten to push its head through the mesh and get trapped. The same applies to chain link fencing which has sufficient 'give' in the mesh to trap a cat by the head.

All wire fencing or netting should be carefully erected and the joins between sections made secure. This can be done by weaving a lightweight stretcher wire through the mesh or by tying the mesh to the stretcher wire at regular intervals of not more than 25cms (10in), preferably less.

A rigid fence is easily climbed by most cats, so too are wooden uprights, no matter which side the wiring is attached. One attraction of the 16 gauge wire mesh is that it does provide a strong climbing frame and play area for active cats. However, an agile cat which can occasionally cope with the first horizontal overhang cannot normally cope with the second drop down section. It is obliged therefore, to stay in its own garden. Where the bottom of the wire is not attached to a solid structure (timber framing or a stone or brick wall), or where the ground level is uneven, the wire should be buried to a depth of at least 10cms (4in) since persistent cats can bend the wire sufficiently to crawl out underneath it. Equally important, other animals can attack the wire from outside the garden and gain access to the cat run, so preferably bury the wire as deep as is practically possible.

Should this type of fencing be developed into a T-shape or a Y-shape rather than simply the upside down L, it will also serve to prevent outside cats from entering the garden. However, any branches which overhang the fence or any tree growing within 2.5m (8ft) of it will permit an agile cat to jump on top of the fence and so cross to the other side - in either direction. In other words, a neighbouring tree may allow an unwanted cat to have access. It will then find it cannot escape! To angle the horizontal section upwards at 45 degrees generally prevents such acrobatic behaviour as cats are more loath to jump on to a slanting surface.

Any gates giving access to the garden will have to be given similar treatment. If the gate is tall enough, the fence can run continuously across the top of it - but not, of course, attached to it. Any gap below the gate must also be dealt with. For example, ground level may be raised by laying paving stones or the bottom of the gate extended by the addition of an extra cross bar and wiring to reduce the gap to an absolute minimum. If the gate opens on to a road, planning permission may have to be sought before any additional fencing is erected. If, however, it stands at the side of a house between neighbouring properties, then extension to a height of 2m (6ft 6in) may be permitted. Again, it is always wise to check with the planning department before undertaking such work. Of course, any gate must inevitably be opened at some time and offers a splendid opportunity to the cunning and adventurous cat. A 'please shut the gate' notice may help here.

Purpose built enclosure   

Enclosing the entire garden will present no problem of access to the house for cats but may be impossible to achieve because of the size or the nature of the garden. The alternative solution is to create a purpose built enclosure specifically for the cats. Here, provision must be made for the animals to be protected from the weather throughout the year, either by having access to the house through a cat flap or window or by the provision of a purpose built cat house or chalet.

This purpose built enclosure can be constructed to provide a special cat run within, or as part of, the garden. It may be open, in the sense that its 'walls' are constructed with the same type of fence and overhang as described previously for the whole garden, or it may be totally enclosed with a roof, this roof being made either of wire mesh, like a fruit cage, or of PVC. If the need is for a large protected area, then a PVC roof with a UV filter is undoubtedly the best solution. Remember that if PVC is to be used, some form of timber roof support will be required to fix the sheets and it would be advisable to increase the size of the vertical supports to 100m x 50mm (4in x 2in) and to incorporate diagonal struts to stiffen the framing. Once again, it is advisable to consult the local planning department to check on any regulations with regard to such structures.

Detached or semi-detached?   

In planning both the size and position of such an enclosure, the first question must be one of access, both for the cats and for their owner. There are two options: 1) a totally self contained run, where the cats can live happily all day until they are taken in on their owners' return home; or 2) a run attached in some manner to the house so the cat can have equal access to both house and run.

The self contained run will require some form of 'house' of its own so that the cats can retire in comfort should the weather prove inclement. A small summer house or garden shed will serve the purpose but it should be insulated for temperature control and lined with a washable surface to make it easy to clean. A melamine faced hardboard serves this purpose very well and will require less maintenance than a good coat of gloss paint. Overall height must be sufficient to make human access easy, whether the cats are permanent, twenty-four hour a day residents, or merely daytime occupiers of their run. A minimum height of 1.8m (6ft) is required. This allows sufficient headroom for most adults without placing the ceiling out of reach for cleaning. The size of this unit or chalet will depend on the number of cats using it and the amount of equipment provided for them. A minimum floor area of 1.5sq m (16sq ft) will provide ample space for one or two cats. If the fenced in area is large and contains a suitable toileting area, then there should be no need for a litter tray in the chalet. Space will still be required for a water bowl, feeding dishes, beds for the cats and chairs both for the cats and for their human visitors. Try to resist the temptation to use this chalet as a garden shed, filling it with garden equipment. This will only create problems later.

If the cats are to be daily visitors to their outdoor house and run, then the question of access has to be considered. How will they get there? Will they be carried each way night and morning, or would it simply be easier to build a run either attached to the house or linked to it in some way. If the cats are already using a cat flap, then access will present no problems. Alternatively, perhaps access could be made through a window. One solution is to transform half the garden into a cat proof enclosure, the framework of which is attached to the house. Such an enclosure can be camouflaged with climbing plants. If the enclosure is constructed using part of a perimeter fence, it may be necessary to consider roofing the enclosure to prevent access by other cats. Once again, discussion with neighbours is vital.

Similarly, the question of access to food, bedding and possibly litter trays arises. If access between the house and outside run is open twenty-four hours a day, there should be no problem. Cats which are used to being shut in at night may, in poor weather, still prefer to use the litter tray rather than go out into the rain. Clean drinking water must be available at all times, so, if access to the house is limited extra provision must be made for this.

Whatever type of enclosure is created, it is important to provide play areas for the cats. If the garden does not already offer such amusement facilities, then the provision of scratching posts, shelves and climbing frames made from branches of trees may prevent the cats from giving too much thought to the possibilities of escape.


The question of maintenance arises with any structure which involves wood. It is important not to use any wood preservatives which contain substances harmful to cats. There are, however, a number of products on the market which are eminently suitable and a few which have no adverse effects provided they are allowed to dry properly before the cats come into contact with the treated surfaces. Likewise, the wiring itself must be checked regularly. Stretcher wires, their attachments and the ties joining individual sections of wiring should also be checked. It is essential to ensure that leaves or heavy snow do not sit on the wire as their weight can cause damage.


A final comment needs to be made on the security aspect of any construction which is left unattended throughout the day. In the same way that the doors and windows of a house are locked when no one is present, any doors or gates providing human access to the cat enclosures should have a security catch like hasp and staple which can be closed and locked with a padlock. This is particularly relevant where the enclosure is attached to the house and where the cats are permitted access through an open window. 

The end result should be a contented cat and a relieved owner, both enjoying the knowledge that the cat is well provided for in conditions of safety which allow as much freedom as possible.



Purrs members' recomend the following cat proof fencing systems:-

Purr...fect fence - An alternative fencing system is Purrfect Fence. For further information please go to:

and the highly recomended...

Secur-A-Cat  This system attaches to the top of wooden fencing. The company does not currently have a website but can be emailed at:  An example of the Secur-a-cat system can be seen here
Once purchased, full support is offered if installing the system yourself via email or over the phone.

A DIY Guide to building your own fencing and enclosures -

Some links for makers of runs as an alternative to fencing the garden

The information is the opinion of the writer in the link to the website provided and is not a substitute for veterinary/professional advice.
Purrs Owners and Staff are not responsible for the content and information provided through links to other web sites.
« Last Edit: August 20, 2009, 10:33:36 AM by Tan »


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