Get reliable limits before cutting near a boundary or releasing a permanent footprint. If the surveyor cannot see or reach what they need, ask them to identify a limited access opening first. That separates the small amount of clearing needed for measurement from the larger project the measurement is meant to define.
A fence can answer the wrong question
An old fence tells you where somebody once installed wire. It does not by itself tell the operator whether the work line follows it. Before marking trees at the edge, identify the current parcel information and who can resolve uncertainty. A strip left temporarily untouched costs less to revisit than an established screen removed in the wrong place.
Ask the surveyor for the opening they need
They may need access to a particular corner, room to work around a monument or a sight line between two positions. Mark that specific request on a sketch. Agree who can release it, how material will be handled and which nearby areas remain off limits. Keep the opening as small as the task allows.
Carry the answer into the next estimate
Once the survey is available, use the updated information to define the construction footprint or fence repair lane. Share the revision with the clearing contractor and the next trade. A quote based on the old sketch may still be useful for budgeting, but resolve any changed limits before work continues.
Give the surveyor a different map from the cutting plan
A surveyor may need to see a corner without needing a straight machine lane to reach it. Ask for the starting point, destination and purpose of each requested opening. On your sketch, draw the temporary survey access in one color and any future driveway or building outline in another. Date it and name the person who can authorize a change.
Consider a corner behind an old wire fence. If the owner marks the fence itself as the end of work, the contractor has a clear-looking instruction but no answer about which side belongs to the owner. Mark the uncertain stretch as a hold. The contractor can still price an approach from land where permission and limits are established.
When the marks disagree
If a survey stake, ribbon and existing fence indicate different lines, pause the affected cut. Photograph the conflicting features together from a safe position. Ask the surveyor what their mark represents, then have the owner confirm the work limit using the updated plan. A survey mark can identify a reference point without telling anyone to remove the tree beside it.
Keep track of unreleased work by location. “Leave the last corner untouched until the surveyor confirms it” is an instruction a contractor can price and follow. “Be careful near the boundary” leaves the most important decision to whoever arrives first.
What to send with the revised estimate request
Attach the current sketch, the surveyor's access request and a photo looking inward from the authorized entrance. Say which trees form the screen you want to retain and where cut vegetation can go. If the survey changes the final footprint, ask for the difference in treatment or hauling to be itemized. You can then decide whether the larger job still serves your plans.