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Luxury Homes and Estates in Marin County

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

Marin County’s luxury homes are concentrated in a handful of southern and central Marin places: Belvedere and the Tiburon peninsula on the bay, the Ross Valley estates of Ross and Kentfield, the canyon and hillside streets of Mill Valley, and the view slopes of Sausalito. In each one, what you can build, remodel or rent depends less on the price than on which government controls the parcel and how strict its design review is. Belvedere reviews almost every exterior change, Tiburon’s board pays “particular attention to view considerations,” Ross recommends a 10,000-square-foot guideline maximum, and Kentfield follows Marin County’s rules because it has no city government.

This page sorts Marin’s high-end market by setting, explains the town rules that shape value at the top, and covers insurance, transfer tax, private sales and what a seller has to prepare. Current prices and sales counts for the segment appear in the market report on this page. For our wider approach to estates, see luxury real estate at Diamond, and for town-by-town basics, our Marin County guide.

Marin County luxury homes for sale

Marin County market report

Where Marin’s luxury homes are

Area	Who sets the rules	Typical high-end setting	Check first
Belvedere	City of Belvedere	Belvedere Island hillsides, the Lagoon and bay frontage	Design review scope, flood zone, view and tree rules
Tiburon	Town of Tiburon; some peninsula addresses are unincorporated	View homes on the peninsula’s slopes and shoreline	Jurisdiction, Design Review Board history, floor area guideline
Ross	Town of Ross	Larger lots on the Ross Valley floor and lower hills, some along Corte Madera Creek	Zoning district, existing floor area, creek setback
Kentfield, including Kent Woodlands	County of Marin	Hillside estates and valley-floor homes	County design review thresholds, fire zone
Mill Valley	City of Mill Valley; nearby areas such as Tamalpais Valley are unincorporated	Canyon, hillside and bayside homes below Mount Tamalpais	Steep-slope limits, design review triggers, access
Sausalito	City of Sausalito	Hillside homes looking over Richardson Bay	City design review and permit history (Sausalito rules not reviewed here)

The table describes common patterns, not boundaries. A mailing address often doesn’t match the jurisdiction, so confirm on the parcel record whether a home is inside a city or town or in unincorporated county land before you rely on any rule below.

At this level, comparable sales are thin and properties differ widely in lot, view, age and permits. Pricing is done house by house against the few true comparables, not by town averages.

Design review: what each town controls

In southern and central Marin, design review is where the value of a remodel or rebuild is won or lost. Each town’s process has different triggers and different priorities.

Belvedere

Belvedere’s code (section 20.04.015) puts nearly all exterior work under design review, whether or not a building permit is needed: new buildings, additions, fences and retaining walls, decks, pools, driveways, exterior lighting and skylights, and landscaping, grading or trees expected to exceed 12 feet when a visually significant part of the lot is affected. The Planning Commission is the review body. Staff can process small single-family additions, more than zero but under 250 square feet of new floor area, or upper-level additions up to 100 square feet, as a design review exception.

The criteria are written for a dense hillside city. Section 20.04.130 asks designs to avoid “monumental or excessively-large dwellings” and large single-plane expanses of glass, and other sections address privacy, reflectivity and keeping grading and vegetation removal to a minimum.

Tiburon

Tiburon’s site plan and architectural review (section 16-52.020) covers new structures, exterior alterations needing a building permit, grading over 50 cubic yards and demolition of a main building, among other items. The Design Review Board decides most applications; the director can act on minor alterations, including residential additions under 500 square feet.

Two of the review criteria matter most to luxury buyers. Site layout review pays “particular attention to view considerations, privacy,” light and air, and in neighborhoods of mainly one-story homes, second-story additions “shall be discouraged.” The floor area guideline tied to lot size is described as a reasonable maximum, not a target. Story poles are required for minor alterations that materially raise roof height or visual mass, with courtesy notice to owners within 300 feet.

Ross

Ross requires design review (Chapter 18.41) for new buildings and for exterior remodels adding more than 200 square feet, as well as grading over 50 cubic yards, work within 25 feet of a creek and more than 1,000 square feet of new impervious landscape surface. The Town Council makes the findings, after mailed notice to owners within 300 feet at least ten days before the hearing.

The guidelines in section 18.41.100 are recommendations rather than mandates, but the council can deny a project that is substantially inconsistent with them. They include a guideline maximum of 10,000 square feet of total floor area, a recommended 50-foot setback from the top of a creek bank for new buildings, preservation where possible of hill and ridgeline views from public streets and parks, and attention to neighbors’ privacy. The town’s zoning districts add their own limits, covered on our Ross page.

Kentfield and other unincorporated areas

Kentfield has no city government, so Marin County’s design review chapter applies. Under Marin County Code section 22.42.020, design review covers all improvements in planned districts and, in conventional districts, residential work where the lot would exceed 3,500 square feet of floor area, a main building would exceed 30 feet or a detached accessory structure would exceed 16 feet.

The county’s findings in section 22.42.060 are explicit about neighbors: a project may not eliminate significant sun and light exposure, primary views and vistas, or privacy on adjacent properties, and its massing and scale must be compatible with its surroundings. Smaller projects outside mapped ridge and upland greenbelt areas may qualify for site plan review instead.

Mill Valley

Mill Valley’s design review chapter (20.66) covers new structures and exterior changes, but most single-family additions are exempt unless they reach 35% of the existing gross floor area or 1,000 square feet, or demolish half or more of the exterior. The Planning Commission or the Zoning Administrator decides after a hearing. On steep lots, near significant natural features, in visually prominent locations or where a house would be out of scale, section 20.66.045 lets the city impose tighter size and height limits and larger setbacks.

Our guide to renovation and design review in Marin walks through applications, story poles and hearings across the towns.

Views, trees and the waterfront

A bay or city view drives much of the premium in Belvedere, Tiburon and Sausalito, but design review protects views only as one consideration among many. Tiburon and Belvedere also have ordinances letting owners seek restoration of views blocked by a neighbor’s trees, with limits tied to when the owner bought. Our post on buying a view home under Marin’s view ordinances explains those claims and how to document a view before closing.

Waterfront estates add a second layer of permits, flood insurance and shoreline structures such as seawalls and docks. Our guide to Marin waterfront homes covers who regulates the shoreline, flood zones and the records to request.

Insurance for a high-value Marin home

Hillside and canyon estates can sit in mapped fire hazard zones, so line up insurance early in escrow. When a regular carrier won’t write a policy, the California FAIR Plan is the fallback. The Department of Insurance describes its residential coverage as a “limited fire policy” with a limit of $3 million per location for residential policyholders.

The FAIR Plan doesn’t include water damage, liability or theft; for those, the Department points owners to a separate difference-in-conditions policy, and as of October 2026 it describes the FAIR Plan’s comprehensive residential option as still in progress. A Marin estate whose rebuild cost exceeds $3 million may need a high-value carrier, a surplus lines policy or layered coverage. Our guide to the FAIR Plan for homebuyers explains how the pieces fit, and an insurance broker can quote the options.

Transfer tax and other costs of a Marin sale

Marin County’s documentary transfer tax is $0.55 per $500 of value, or $1.10 per $1,000, on full value less any loans the buyer assumes. San Rafael is the only city the county recorder lists with its own tax, $2.00 per $1,000 on full value, according to the Assessor-Recorder’s fee page (updated October 23, 2026). Belvedere, Tiburon, Ross, Mill Valley, Sausalito and unincorporated Kentfield add no city transfer tax on that list.

Hypothetical $6,000,000 sale, no assumed loan	County tax	City tax	Total
Belvedere, Tiburon, Ross, Mill Valley, Sausalito or Kentfield	$6,600	None	$6,600
Inside San Rafael city limits, current rate	$6,600	$12,000	$18,600
Inside San Rafael if Measure W passes	$6,600	$60,000	$66,600

A caution for San Rafael: Measure W, on the November 3, 2026 ballot, would raise the city’s rate from 0.2% to 1% of value. A simple majority passes it, and it would apply starting ten days after the council certifies the vote, so a San Rafael sale closing in late 2026 should be priced and negotiated with both rates in mind. The county’s ballot analysis notes the tax may be paid by the seller, the buyer or both, depending on their agreement.

Who pays is a contract term: across Diamond’s North Bay markets the seller customarily pays, though that is negotiable and customs vary by city. Our California transfer tax guide shows the rates across the region.

Buying a luxury home in Marin

A high-end purchase here takes more specialized investigation than a typical sale. Before removing contingencies, settle:

Jurisdiction and permits. Confirm city, town or county, and match every structure, deck, pool and second unit to a permit and final inspection.
What you can change. Ask the planning department about the lot’s design review history, the floor area already built and any conditions of past approvals.
Insurance. Get written quotes for fire, flood where relevant, and difference-in-conditions coverage, and confirm your lender accepts them.
Views and neighbors. Photograph the view, read recorded easements and covenants, and check pending applications on neighboring lots.
Short-term rental plans. Rules differ by town and in unincorporated Marin; don’t count on rental income until you’ve read the local rule.

Some buyers want to see homes that never reach the open market. Diamond markets to likely buyers through its own client database and targeted off-market campaigns. We can’t, however, promise anyone access to another brokerage’s office-exclusive listings.

Selling a luxury home in Marin

Start with the reports your town requires, because several take time and some must be finished before closing. Tiburon, for example, requires a Residential Building Report before any dwelling is sold, at $250 for a single-family home, with reports typically ready within 10 days of the inspection and mandatory life-safety items corrected within 30 days of closing. Belvedere asks sellers to schedule a Report of Residential Building Records inspection and a sewer lateral inspection. Our page on Marin selling requirements lists each town’s and district’s rules.

Many sellers at this level ask about selling quietly. Under NAR’s Clear Cooperation Policy, a listing broker must submit a property to the MLS within one business day of marketing it to the public, and public marketing includes yard signs, window flyers, public websites, brokerage website displays, email marketing and multi-brokerage sharing networks. NAR’s Multiple Listing Options for Sellers works alongside that rule, and MLSs can set a delay period during which a listing isn’t publicly marketed. Our guide to private and off-market luxury sales compares the options and their cost in exposure.

Prepare a complete file before launch: permits and final inspections, design review approvals, town reports, insurance history, flood and fire documents, and any recorded view or access agreements. A buyer’s investigation at this price is thorough, and gaps found late cost time and leverage.

Questions people ask

Where are the luxury homes in Marin County?

Mostly in Belvedere, Tiburon, Ross, Kentfield (including Kent Woodlands), Mill Valley and Sausalito, with bay-view, waterfront, valley-floor estate and hillside settings. Each has its own planning rules, and Kentfield follows county rules.

Do I need design review to remodel a house in Belvedere?

Almost certainly. Belvedere’s code covers new buildings, additions, decks, pools, fences, lighting, landscaping and more, whether or not a building permit is needed. Small additions under 250 square feet, or upper-level additions up to 100 square feet, can go to staff as an exception.

Does Tiburon consider views in design review?

Yes. Tiburon’s review criteria give “particular attention to view considerations, privacy,” light and air, and discourage second-story additions in mainly one-story neighborhoods. Separate rules address views blocked by trees.

How big a house can I build in Ross?

Ross’s design review guidelines recommend a guideline maximum of 10,000 square feet of total floor area, and each zoning district adds its own floor area and coverage limits. The guidelines aren’t mandatory, but the Town Council can deny projects that are substantially inconsistent with them.

Is Kentfield governed by a city?

No. Kentfield is unincorporated, so the County of Marin handles planning and design review. County design review applies to residential work where the lot would exceed 3,500 square feet of floor area or a main building would exceed 30 feet, and to all work in planned districts.

When does a Mill Valley remodel need design review?

Most single-family additions are exempt unless they reach 35% of the existing floor area or 1,000 square feet, or demolish half or more of the exterior. New structures and many exterior changes need review, and steep or visually prominent lots can face tighter limits.

What is the transfer tax on a Marin luxury home?

$1.10 per $1,000 of value countywide, less assumed loans. On a $6,000,000 sale that is $6,600. Inside San Rafael, add $2.00 per $1,000 on full value, or $10.00 if Measure W passes.

Can the FAIR Plan insure a Marin estate?

Up to $3 million per location for residential policyholders, and only as a limited fire policy. Theft, water damage and liability need a separate difference-in-conditions policy, and larger homes may need a high-value or surplus lines carrier.

Can I sell my Marin home without listing it publicly?

Yes, within MLS rules. NAR’s Multiple Listing Options for Sellers allows some private marketing choices, but once a home is marketed to the public, the listing must go into the MLS within one business day.

What reports does a Marin seller need?

It depends on the town and sanitary district. Tiburon requires a Residential Building Report before sale, Belvedere asks for a records inspection and a sewer lateral inspection, and other towns have their own rules, listed on our Marin selling requirements page.

This page is general information, not legal, tax or insurance advice; for a specific property, talk to a California real estate attorney, a tax adviser and a licensed insurance broker. Diamond may refer you to partners we work with; you’re free to choose any provider.

For a confidential conversation about buying or selling a Marin estate, contact Diamond Real Estate Group.

Sources & notes

GoCodebook copies are unofficial reproductions; confirm code text with each town’s planning department. Sausalito’s design review rules were not reviewed for this page.

Last reviewed October 2026 by Matthew Martinez.