For a free no obligation quote contact us on

01344 311101 or 07590 361898

or via e-mail at

About Calibra

Tree surgery and stump grinding company based in Bracknell in Berkshire

Calibra Tree Surgeons

We cover Berkshire, Buckinghamshire, Hampshire, Surrey and London.

Our services include:

  • Large Tree Dismantling
  • Tree Felling and Shaping
  • Tree Thinning and Pruning
  • Fruit Tree Maintenance
  • Stump Grinding
  • Logs

All our employees are fully insured and qualified to carry out any work required.

For a free no obligation quote contact us on (01344) 311101 or 07590 361898 or via e-mail at

Calibra Background

Mark Grubb started Calibra in 1998 and has grown the business over the years. Mark cares passionately about the work carried out by Calibra. The trees, the customers and the staff are Marks number one priority, if all three are happy then life is good. Health & safety is paramount and always being updated and discussed within the company.

We pride ourselves on being the friendliest Tree surgeons around our staff are always happy to go that little step further. We have a continuous training program as our industry is always learning and improving. We are also members of the Arboricultural Association.

Calibra tree surgeons provide professional arboricultural services to all clients. Our quotes are tailored to the individual needs of the Client and the trees.

We offer friendly, informed advice, liaise with local authorities and carry out all applications for work to be carried out on protected trees. Risk assessment are carried out before any work is undertaken. We use a third party non-biased Tree consultant for surveys.

Calibra Services

Calibra offer a wide range of services

Tree pruning

The misconception of what pruning work should be carried out to a tree to make it safe has changed as we understand the science of trees. Although you may feel your tree needs to be reduced, we will offer a suggestion of what the tree may tolerate. A heavy reduction may result in vigorous regrowth, cause long term safety issues or even the eventual decline of the tree.

Tree removal/felling

Calibra specialise in the attentive removal of trees in dangerous and restricted areas by using sectional felling and modern techniques. We use Cranes & MWEPS (Mobile Elevating Work Platforms) where necessary.

Crown reduction & lifting

Crown reduction & lifting is used to reduce the height and/or spread of the crown of a tree allowing more light to pass through and to reduce wind resistance and weight of heavy branches. It may also be used to improve access beneath. Common practice is 2.5m for pedestrians and 5m for highways, whilst maintaining the tree's natural shape as far as possible and avoiding large wounds and decay ingress.

Crown thinning

Removal of dead, diseased, broken, crossing/rubbing branches including Ivy & climbers. Thinning is measured by a percentage.

Fruit tree pruning

Regular Fruit tree maintenance is usually required to encourage a healthy fruit crop & to prevent fruit being too far out of reach.

Hedge trimming/Removal

Regular maintenance on any large or small hedges. Tired & old un-maintained hedges sometimes need a more severe approach.

Soil Amelioration

Adding Woodchip/Mulch below the canopy around the base of the tree. This is important for trees that suffer from soil compaction/erosion. The term Amelioration means maintain & improving the quality of the soil for the health of the tree.

Stump removal

Large or small if the stump cannot be left as a habitat it can be ground out using our Grinders. Our smallest grinder will go through a front door if access is a problem.

Calibra's Customers

Here at Calibra we value our customers and always aim to provide a great service and we love hearing back from our customers after a job's complete.

I was very impressed with Calibra from the moment i met Mark and grateful for his knowledge regarding what could be done with the two trees in my garden. Furthermore the three lads that came to carry out the work were also very knowledgeable and it was good to see that the high standard of work was carried out in a safe manner with them leaving the garden neat and tidy afterwards.

Guy , Crowthorne

Get in Touch

You can contact Calibra by phone one of the following methods


Lane End Cottage, Warfield Street

Warfield, RG42 6AR