Forest Hill, San Francisco: Redwood Pre-Removal as a Tree Preservation Strategy

Preserving a Landmark Redwood While Eliminating Risk in Forest Hill

In one of San Francisco’s most elegant and tree-rich neighborhoods, Forest Hill, a family purchased a home surrounded by mature greenery—exactly the kind of setting that defines the area. Among the trees was a massive coast redwood, an old specimen with a trunk measuring close to five feet in diameter at breast height (DBH).

The redwood was not just part of the landscape; it was part of the reason the family chose the house. Preserving it mattered deeply to them.

But age, history, and past pruning decisions had quietly turned parts of this tree into a serious hazard.

This case study shows how pre-removal—a targeted technical form of risk mitigation—can preserve an old tree while restoring safety in an extremely constrained urban environment.

Hazardous coast redwood before pre-removal in Forest Hill, San Francisco, showing large branches close to a residential home — *The mature coast redwood with branches extending toward the family’s home prior to technical pre-removal by Arborist Now*

An Old Redwood with a Complicated History

At some point, long before the current owners moved in, the redwood had been severely cut back—whether intentionally or as a result of storm damage is unknown. From that large historic cut, three major limbs regenerated.

Over time, those limbs developed very differently:

One had already been removed before our involvement
One was declining, highly exposed to wind and salt air
One had grown into a pronounced “S” shape, extending directly above and toward the house

This last limb was the most concerning. It was massive, structurally compromised, and positioned squarely over the home—exactly the scenario arborists define as high consequence of failure.

Immediate Risk Assessment by a Lead Arborist

When Guillaume Pernet, lead arborist at Arborist Now, arrived on site, the danger was immediately apparent.

Guillaume—trained in France and experienced with large, mature trees in urban settings—identified several compounding risk factors:

Weak attachment at the historic cuts
Poor structural integrity in the upper limbs
Declining health in exposed canopy sections
A heavy limb extending over a high-value target: the home itself

Most importantly, there was no viable way to stabilize the upper crown.

Why Cabling or Bracing Was Not an Option

Steel cabling and bracing can be effective tools—but only when there are healthy anchor points and sound wood.

In this case:

The upper limbs were structurally weak
Their health was already compromised
There was no reliable anchor capable of supporting dynamic loads

Installing cables would have provided false security, not real risk reduction.

The responsible solution was clear: Remove the hazardous upper canopy back to the historic cut while preserving the healthier lower canopy.

Arborist assessing hazardous branches in a mature coast redwood canopy in Forest Hill, San Francisco before pre-removal work — *Arborist Guillaume positioned in the canopy of the coast redwood, assessing hazardous limbs prior to technical pre-removal & risk mitigation*

The Pre-Removal Strategy: Safety Without Erasing the Tree

The agreed-upon plan was a pre-removal, not a full removal.

The goals were:

Eliminate immediate danger to the house
Remove dying and wind-exposed canopy
Preserve the healthy lower crown for privacy and aesthetics
Extend the life of the tree for years to come

The result would be a safer, smaller redwood that still provided shade, screening, and visual presence, anchored by its monumental trunk.

A Highly Technical Removal with No Room for Error

Executing this plan was far from simple.

Because of tight access and proximity to the house, crane use was not possible. The hazardous limb had to be dismantled entirely by rope and pulley, directly over the home.

This is where experience matters.

Veteran arborist Matt, originally from the UK, led the technical rigging. The margin for error was extremely small—any uncontrolled swing could have caused catastrophic damage.

Arborist ascending a mature coast redwood to install precision rigging for hazardous branch removal in Forest Hill, San Francisco — *Arborist Matt ascends the coast redwood to install precision rigging systems to safely manage hazardous limbs during pre-removal work*

Precision Rigging in a Confined Space

Matt used:

Two independent ropes
A static lowering system
Zero swing radius

Each piece of wood was carefully controlled, lowered straight down, and cleared from the structure without shock loading or lateral movement.

Piece by piece, the hazardous canopy was removed—slowly, methodically, and safely.

Protection, Coordination, and Respect for the Neighborhood

The work required multiple days and involved visible large-scale tree operations.

Prior to starting, the Forest Hill HOA was contacted and informed of:

The scope of work
The duration
Temporary noise and dust

The HOA appreciated the communication, and neighbors understood the necessity of the operation.

On site, the crew installed extensive protective measures:

Ground and hardscape protection
Structural shielding near the house
Clean, controlled debris handling

Despite the complexity, the site was kept clean, organized, and safe throughout the project.

Large coast redwood section being carefully lowered with precision rigging into a tight drop zone in Forest Hill, San Francisco — *A large section of the coast redwood is carefully lowered into a tight drop zone using precision rigging*

Giving the Wood a Second Life

Where possible, Arborist Now always looks for ways to reuse and recycle urban wood.

During this project:

A neighbor requested round wood slices to create printed impressions
Family members collected additional pieces as keepsakes

Because of access limitations, the wood had to be cut into small sections, making milling impractical—but the effort to reuse material wherever possible remained part of the process.

The Result: A Safer Property and a Preserved Tree

Once the pre-removal was complete:

The dangerous upper canopy was gone
The lower crown remained healthy, dense, and dark green
The massive trunk still anchors the garden visually
Privacy and coverage were preserved

Most importantly, the home and surrounding area are now safe.

From the garden, the redwood still looks powerful and beautiful—just no longer threatening.

Arborist cutting large coast redwood sections on the ground with a chainsaw after controlled rigging in Forest Hill, San Francisco — Arborist safely breaking down large coast redwood sections with a chainsaw after pre-removal work in Forest Hill, San Francisco by Arborist Now

What “Pre-Removal” Really Means

Pre-removal is not avoidance. It is strategic risk management.

In cases like this:

Full removal may be emotionally, aesthetically, or historically too radical
Immediate danger must still be addressed
Time is needed to plan for succession planting and transition

Pre-removal allows homeowners to:

Reduce risk responsibly
Preserve meaningful trees
Prepare for eventual removal on their own timeline

It is a form of old tree preservation, even when the long-term reality is that the tree will not live forever.

A Philosophy of Compromise: Safety and Stewardship

At Arborist Now, we believe the best arboriculture often lives in the middle ground:

Between safety and sentiment
Between preservation and reality
Between technical rigor and human attachment

This Forest Hill redwood is a perfect example.

The tree lives on.

The home is protected.

And the transition toward the future has already begun—intentionally, thoughtfully, and safely.