Marvin is the brand you reach for when the window has to serve the architecture, not just fill the hole. It's a premium wood-and-fiberglass manufacturer built around design flexibility — large sizes, custom shapes and sizing, deep finish and hardware options — which is exactly what Larkspur's more distinctive homes tend to demand. Between the character cottages near downtown, the custom houses stepped into the redwood canyons, and the hillside homes below King Mountain with their view walls and irregular openings, "off the shelf" often doesn't cut it here. Bay Area Siding Company installs Marvin across Larkspur from its base on Magnolia Avenue and manages the full scope: field measuring, glazing and finish selection, permitting, removal, flashing, air-sealing, and the walkthrough.

Have a project that needs the right window? Request an estimate or call (415) 619-5167.

When Marvin is the answer

Reach for Marvin when one or more of these describes your Larkspur project:

• The openings aren't standard. Oversized picture units, tall casements, arched or shaped windows, or a design-driven remodel where sizing has to be precise rather than rounded to a catalog — common on custom canyon and hillside homes. Marvin's made-to-order approach is built for this.
• The architecture is the point. On a character cottage near the Magnolia Avenue historic district or a custom hillside home, the profile, the sightline, and the wood interior all read in the room. Marvin's wood and clad-wood options let you keep that character while upgrading to a modern dual-pane, Low-E unit.
• You want wood or fiberglass, done at a high level. Marvin's identity is premium wood and fiberglass — not vinyl — with the fit and finish to match.

If none of that applies and your goal is efficient, warranty-backed vinyl at a lower cost, you may be better served by Anlin or Milgard — and we'll tell you so.

Marvin's lines

• Signature — Marvin's architectural, largely made-to-order tier: the deepest design flexibility, largest sizes, extruded aluminum clad exteriors over wood interiors, and the widest range of shapes and finishes. This is the line for a purpose-built or heritage-caliber Larkspur home.
• Elevate — a fiberglass exterior over a warm wood interior: much of the wood look inside with the durability and low maintenance of fiberglass facing the weather. A strong middle path for character homes that want wood indoors without the exterior upkeep in a damp climate.
• Essential — all-fiberglass, inside and out: clean, strong, low-maintenance, and dimensionally stable, with fiberglass's tolerance for darker finishes. A durable, design-forward option when an interior wood look isn't required.

Each line covers the operating styles a Larkspur remodel typically needs and can be specified with the glass package your comfort goals and permit require.

Fiberglass, wood, and why it matters here

Fiberglass expands and contracts very little with temperature swings, which keeps sightlines tight and seals sound over time — a real advantage on large units and on hillside homes that see more sun and wind above the canyon shade. Wood interiors bring warmth and the ability to match or stain to an existing room. Marvin lets you choose where you want each: an all-wood-look interior with a tough exterior (Elevate), all-fiberglass throughout (Essential), or the fullest architectural wood expression (Signature). On a walkthrough we match the line to the room, the exposure, and the budget.

Warranty and positioning

Marvin is a high-end brand, and its windows carry limited warranties that vary by line and component. We state warranty coverage generally and confirm the exact current terms in writing before you order. Budget accordingly — Marvin's value is in design capability and build quality, and it's priced as a premium product.

Larkspur context: character, damp winters, and the canyons

Larkspur's architecture is a big reason Marvin comes up here: a lot of these homes reward a window chosen for proportion and material, and many older ones still run on original single-pane sash that a careful Marvin replacement upgrades without erasing the home's character. On performance, the town's mild, marine-influenced climate makes a good window largely a comfort-and-draft improvement through damp winters. Title 24 caps U-factor and SHGC for replacements, and because those limits vary by climate zone and code cycle, we spec to the code in effect at permit time. The City of Larkspur requires a building permit for window replacement, which we handle, and design review may apply near the historic downtown.

Canyon and hillside projects add a consideration: those neighborhoods carry real wildfire exposure, and Central Marin Fire adopted California's updated Fire Hazard Severity Zone maps in 2025. Where an opening is altered on a parcel in a High or Very High zone or the Wildland-Urban Interface, California Building Code Chapter 7A can require multi-pane glazing with at least one tempered pane — something to plan into an architectural window early, since custom units have longer lead times. Marvin can supply tempered glazing to comply; whether your parcel requires it depends on its designation and whether the work is a repair or an alteration, which we confirm with the City and Central Marin Fire before ordering.

Retrofit vs. new-construction — and lead time

Marvin builds both retrofit and new-construction windows. A retrofit (insert) install keeps the existing frame and is less invasive; a new-construction install removes the window to the framing so the flashing and water barrier can be fully renewed — frequently the right method on older homes, on shaped openings, and when re-siding at the same time. In Larkspur's damp, water history around openings is common, and because Marvin is often made to order, we lock measurements and method before ordering and build the lead time into the schedule.

What affects the cost

No online prices — a custom-capable premium brand spans a wide range. Drivers: the line (Essential, Elevate, Signature) and glass package; the number, size, and shape of openings, since custom and oversized units cost more; retrofit versus new-construction; whether a canyon parcel triggers tempered or multi-pane glazing; framing condition, since rot repair adds scope; and access on a hillside or upper story. A field walkthrough is the only way to price a Marvin project honestly.

Frequently asked questions

Why choose Marvin over a standard vinyl window in Larkspur? Marvin makes sense when the openings are non-standard, the architecture matters, or you want premium wood or fiberglass. For an efficient, lower-cost vinyl changeout, Anlin or Milgard may fit better — the right answer depends on your home and budget.

What's the difference between Marvin's Elevate and Essential lines? Elevate pairs a fiberglass exterior with a warm wood interior; Essential is all-fiberglass inside and out. Choose Elevate for an interior wood look with a low-maintenance exterior, Essential for maximum durability when a wood interior isn't needed.

Can Marvin handle an oversized or custom-shaped opening on my canyon home? Yes — Marvin's made-to-order approach, especially the Signature line, is built for large, arched, or unusual openings and precise sizing, which is a common need on Larkspur's custom canyon and hillside homes.

Do custom Marvin windows still meet Larkspur's fire-zone and permit rules? Yes. The City of Larkspur requires a permit for window replacement, and on a canyon or hillside parcel an altered opening can trigger Chapter 7A tempered or multi-pane glazing — which Marvin can supply. We confirm parcel requirements with the City and Central Marin Fire and build the lead time in before ordering.

Get started

Get an architecturally right window measured, specced, and installed the first time. Request an estimate or call Bay Area Siding Company at (415) 619-5167. We also handle window replacement, siding replacement, and James Hardie siding in Larkspur, serve the wider Marin area, and share finished work in our project gallery.