There is any number of reasons you may want to employ professional tree surgeon also known as an arborist. You may have a large or difficult tree, you may require some delicate pruning or you may want piece of mind against damage to your property.
There is no easy answer to this question. Unfortunately there is no compulsory scheme (equal to the gas safe register for example) in a arboriculture. There are two schemes (Tree Care Approved and the Arboriculture Association Approved Contractor) but there are plenty professionals who operate outside these schemes. Two schemes also means twice the annual cost and until the industry decides on which scheme will be the main scheme we will be holding back on joining either. We are however associate members of the Arboriculture Association and the Royal Forestry Society, proving our commitment to arboriculture, industry best practice and a safe working environment.
Anyway, enough about us, back to the question in hand.
Outside of the two schemes you should always ask to see proof of insurance and always ask for written quotations. If your tree surgeon cannot provide either of these then do not use them, there are plenty other companies out there who are able to provide these basic documents.
You should also ask questions about how the job will be conducted and what equipment will be used. This is far from fool proof but it will give you an idea of what to expect on the day. Speaking to a few arborist will give you an idea of who knows what they are talking about.
Don’t be surprised if your tree surgeon turns up in a beaten up old van with a similar looking chipper on tow. Machinery takes a beating from heavy logs and dust/wood chip get everywhere. However, climbing equipment is different kettle of fish. Proper climbing and lowering rope must be used along with a suitable harness. Scaffolding harnesses are not acceptable and full body harnesses are not advisable as they restrict movement around the tree. Blue nylon rope should not be used, under any circumstances.
Once the site is setup (signs and cones out etc) the climber will enter the tree, normally by a ladder and begin work. Large branches and branches over obstacles (green houses, ponds, houses, fences etc) can be lowered off using a suitable rope and pully. A friction device can be placed at the bottom of the tree to lower of very heavy pieces.
As the climber works the ground staff will remove the branches as they fall and put them through the chipper, which can be a loud and dangerous process so its best to stay away while its running.
Once the work is finished the clean up begins. Saw dust gets everywhere and I mean absolutely everywhere. We have blowers, rakes and scoops to get most of the mess up and will always tidy up. Luckily, any flakes of sawdust which remain will soon decompose and it makes good plant food too. We only leave once you are satisfied with the work and the tidy up.
Hopefully this has give you some idea of how to get a professional tree surgeon. Please let us know if we have missed anything, if you would like to discuss you tree care needs or if you just need some advice.