Hi

I have a mature tree at the bottom of my new garden. I think it's a sycamore
(will have a better idea when the leaves grow) and it is easily over 40 feet
high.

I plan to build a garage/workshop on the land under the tree and this is to
include a service well, ie a sunken walkway in the floor of the garage, so I
can walk under a parked car to service it, rather than have to elevate the
car on ramps etc.

The pit will be about 6 feet deep and 3 feet wide and I wonder if digging it
will affect the tree.

I'm looking for information on the size, depth and spread of tree roots, so
I can gauge the likely impact of digging the foundations of the workshop and
the service well.

Can anyone point me to a site with this info, or do you know how deep a
sycamore sinks it's roots, and how far from the trunk they extend?

Regards
James