Custom homes & residential design in Belvedere and Tiburon
Belvedere and Tiburon share a peninsula and a ZIP code, but a home design follows the rules of its own parcel. A property may be inside Belvedere, inside Tiburon or in unincorporated Marin County. Begin by confirming the boundary and gathering the existing survey, permit history and site photos. Then test the home from neighboring viewpoints as carefully as from its own deck.
ZIP 94920
Start with the right address
94920 spans incorporated Belvedere, incorporated Tiburon and potentially unincorporated Marin County parcels. Verify the parcel's jurisdiction before applying either city's review guide.
Confirm the reviewer before developing the scheme
Belvedere's design review code covers new buildings and many exterior physical changes, with its Planning Commission responsible for review. Tiburon's permit guide describes review by either Planning staff or the Design Review Board, depending on scope; new buildings, additions over 500 square feet and variance applications go to the board. These are different processes, even though the addresses may share 94920.
For an unincorporated parcel, start with Marin County instead. Ask the relevant authority to identify zoning, required approvals and submittal materials for the address. This small due-diligence step can change the timing and content of the design package. It also keeps early concept work focused on a real site rather than on a broad peninsula stereotype.
- Locate the parcel on an official jurisdiction map.
- Request existing approvals and conditions from the correct agency.
- Confirm whether proposed exterior changes trigger design review.
Treat views and privacy as a two-way study
Tiburon's design review guide specifically names view blockage, privacy, neighborhood character, size and scale as common review issues. Belvedere's design criteria also address site relationship and building mass. On narrow or sloping parcels, a few feet of roof height or a shifted terrace can alter a neighbor's experience substantially. Study elevations and sections at human eye level from both sides of the property line.
The design response need not sacrifice the owner's own outlook. A well-placed window can frame a view while screening direct sightlines; a terrace can be useful without projecting toward a neighbor's bedroom. Test daylight, prevailing exposure and evening lighting together. The result should feel calm in daily use, not merely pass a dimension check on paper.
- Photograph the site and nearby windows from multiple levels.
- Compare terrace, window and roof options in section.
- Show planting and screening at realistic mature heights.
Make the hillside construction plan part of design
A dramatic bay outlook can hide difficult grade changes, limited staging space and complicated access. Commission a survey and, when warranted, geotechnical advice before fixing floor elevations. Coordinate stairs, retaining structures, stormwater and vehicle movement with the architecture from the outset. A refined elevation can unravel if its support and access are resolved only after design review.
For renovations, examine the existing house's structural grid and route through the site. A modest reorganization may improve everyday use more than an additional floor. If added area is necessary, compare schemes against excavation, construction disturbance, privacy and the garden that remains. A concise decision matrix will make those tradeoffs visible before details and finishes create momentum.
- Survey grade, property lines and existing retaining walls.
- Study construction access alongside finished access.
- Compare renovation options by site disturbance as well as area.
You asked, we answered
Does 94920 have one design review process?
No. Belvedere, Tiburon and unincorporated Marin parcels can share the ZIP code. Identify the parcel's governing agency before planning permits.
Who reviews a large Tiburon addition?
The town's 2025 guide says additions over 500 square feet are reviewed at a public Design Review Board meeting. Verify the current path for the proposed scope with Tiburon Planning.
Are exterior changes in Belvedere reviewed?
Belvedere's code brings many exterior changes into design review, with exemptions or staff review for some minor work. The City should confirm the correct classification for the specific project.
Local planning resources
Sources reviewed October 28, 2026. Confirm the current requirements for your parcel and scope with the reviewing authority.
Make the next conversation concrete
Share your property address, available plans and the changes you are considering. We can discuss the scope, site and the right next step for your home.
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