Mill Valley: no view ordinance, strict tree rules, and how neighbor disputes actually resolve

Views in Mill Valley

Under 20.67.090 a removal permit may be granted where removal is needed for one of five objectives, one of which is to "ensure reasonable preservation of views and sunlight." That is a ground the tree's owner can cite in an application, and a basis on which a neighbor can support it. It is not a right a neighbor can enforce against an owner who does not want to remove the tree. Under 20.67.100 the City may deny a permit where "adequate provisions for drainage, erosion control, land stability, avoiding adverse visual impacts and windscreening have not been made," which cuts the other way: removal that would open your view can be denied for its visual impact on others.

The practical route to a view in Mill Valley is pruning that stays under the one-third threshold, agreed with the owner on an arborist's specification. See tree blocking my view for what state law does and does not give you.

Protected and heritage trees (20.67)

• Heritage trees, measured at 4.5 feet: tanbark oak at 65 inches circumference (about 20 inches diameter), oak and madrone at 75 inches (about 24), coast redwood at 95 inches (about 30), plus any tree the City Council designates after a hearing. Heritage removals require a public hearing.
• Vacant parcels: any tree over 12.5 inches circumference (about 4 inches diameter) needs a permit.
• Developed parcels: removing four or more trees over 19 inches circumference within 12 months needs a permit, unless the City requested the work for vegetation management.
• Pruning: removing more than one-third of a tree's foliage in 12 months is "removal"; so is severe trimming or topping that foreseeably kills or permanently damages the tree. Topping is "indiscriminate cutting of tree branches to stubs or lateral branches."
• Tree reports: the City may require one, by an arborist "selected and retained by the City but whose fees are paid for by the applicant."
• Replacement: conditions and replanting; off-site replacement may be satisfied by $300 per 24-inch box tree.

Penalties (20.67)

Violations are a public nuisance and may be charged as misdemeanors or infractions. Minimum fines of $1,000 per non-heritage tree and $5,000 per heritage tree, or the replacement value if greater; each tree and each day a separate offense; doubled for a repeat within 24 months. A removed tree whose condition cannot be determined is presumed to have been in excellent condition. Replacement at 3:1 for non-heritage trees and by formula for heritage trees, plus all corrective costs. Where a tree professional on the City's list did the work, the fine goes to the professional, who is removed from the list.

For a neighbor dispute this matters twice: nobody, including the owner, can remove a protected tree to end an argument without a permit; and a neighbor who over-prunes "their side" of a heritage tree past the one-third line can face these penalties on top of Civil Code 3346 damages. Mill Valley permit process →

How neighbor disputes resolve in Mill Valley

1. Hazard, damage and encroachment run on state law: Civil Code 833 and 834 for ownership, 3479 for nuisance, 1714 for negligence, and the Booska limit on self-help. A hazardous tree supports a removal permit under 20.67 and the report supports both.
2. Views run on negotiation and the one-third pruning rule, with the permit process available when the owner is willing.
3. Everything runs better with an independent arborist report both neighbors can read.

Dispute Assessment Report, from $850; a pruning specification designed to stay under the one-third threshold is part of it. Start the report

Sources

1. Mill Valley Municipal Code Chapter 20.67, Trees on Privately Owned Property, reviewed October 23, 2026. Confirm current text with the City before relying on it.
2. City of Mill Valley, Summary of Tree Regulations.