//Shop by Window
Angled & Arched Window Treatments in Marin County
Custom-template plantation shutters and specialty-shaped cellular shades follow the exact contour of arched, angled, and circular windows - preserving architectural character across Marin County and Petaluma.
//Arched Windows
Can You Fully Cover an Arched Window?
Yes. Custom-template plantation shutters trace the exact curve of arched windows, providing full coverage from sill to peak without masking the architectural contour. The arch section is typically fixed while the rectangular portion below operates with adjustable louvers for daily light and privacy control.
Heritance hardwood shutters are the preferred solution for arched windows in historic Mill Valley and Marin County homes because they create a permanent architectural element that enhances rather than conceals the window's shape. Each arched shutter panel is built from an on-site cardboard template that captures the exact radius and any irregularities from settling or original construction. The finished product fits the opening precisely with no light gaps around the curve. For homeowners who prefer a fabric solution, Duette cellular shades are available in specialty arch shapes with fixed positioning in the curved portion and retractable operation in the rectangular section below.
//Which Products Template to Shape
Products Built for Arches, Angles, and Circles
Specialty-shaped windows are architectural features that define a home's character. Arched transoms above entryways, angled gable windows, circular porthole windows, and trapezoidal clerestories all present the same challenge: standard rectangular treatments cannot cover them without either leaving the unique shape exposed or concealing it behind a flat treatment that defeats its purpose. On-site cardboard templating and precision fabrication produce treatments matching the exact contour of every specialty window in your home.
Heritance® plantation shutters template to the widest range of shapes - arch, angle, circle, and trapezoid - as fixed or operable panels with adjustable louvers and roughly R-3.0 insulation. Duette® cellular specialty shapes cover arches, angles, and trapezoids in a fixed position, delivering the highest thermal performance of any covering - R-3.5 single-cell up to R-7.0 triple-cell Architella®. For a soft finish, custom drapery on a flexible curved traverse rod follows an arch contour and can be motorized. Every specialty treatment requires on-site templating for accurate fit - a service included at no charge with every Bay Blinds consultation. Compare the full range of custom window treatments or browse by room.
//UV Protection
Protecting Interiors Through Tall, Oddly Shaped Glass
Specialty-shaped windows are often left uncovered, exposing hardwood flooring, artwork, and furnishings to unfiltered UV radiation that causes fading and material degradation. Custom-fit treatments block up to 99% of harmful UV rays through the exact window shapes that standard products cannot cover.
Arched transoms, clerestory windows, and angled gable openings receive some of the most intense direct sunlight because they are positioned high on walls where the sun strikes at a steep angle for much of the day. Leaving these windows uncovered while treating the rectangular windows below creates a UV gap that accelerates damage to the very areas of floor, art, and furniture that receive the most exposure. UV-filtering treatments custom-cut to match these specialty shapes close the gap and provide consistent protection across every window in the room. For hillside estates in Lucas Valley with significant art collections, this complete coverage approach is essential. For maximum rejection, custom-cut solar shades block up to 99% of UV regardless of window shape, while Silhouette® shadings diffuse harsh light on tall south-facing glass.
//Motorization & Reach
Motorized Control for High and Hard-to-Reach Shapes
Angled gable windows, clerestories, and arched transoms are frequently mounted high on the wall, out of comfortable reach. Motorization removes the access problem entirely, operating the treatment below the arch or angle with an app, voice command, or schedule.
Hunter Douglas PowerView® automation raises, lowers, and schedules the operable portion of a specialty-window treatment without cords or a step ladder - especially practical for the tall gable and clerestory openings common in San Rafael hillside homes. Custom drapery on a curved traverse rod can also be motorized to follow an arch, and all cordless and motorized options meet the ANSI/WCMA A100.1-2022 child-safety standard. As an authorized Hunter Douglas dealer, Bay Blinds installs both battery-powered and hardwired PowerView systems across Marin County and Petaluma. Skylights are a related overhead challenge - see our skylight treatments page.
//Historic Preservation
Protecting Historic Millwork Across Marin County
Bay Blinds uses non-invasive mounting techniques including compression brackets and concealed shallow-screw placements that protect original millwork, casings, and decorative trim on historic Marin County homes.
The Grant Avenue Historic District in Mill Valley contains some of Marin County's most architecturally significant homes, with original dovetail window casings, hand-carved rosettes, and period-appropriate trim that cannot be drilled, modified, or concealed. Bay Blinds has installed custom treatments in a 1908 Craftsman on Grant Avenue where we matched 14 windows including two arched transoms using 3.5-inch basswood louvers with a hand-matched Colonial White stain to complement the restored Douglas fir trim. Every screw placement was coordinated with Murphy McKenna Construction and approved by the Mill Valley Historical Society before installation. This same preservation-first approach applies to every historic home we serve across Mill Valley, Novato, and Petaluma. Browse more solutions by window type.
//Related Products & Solutions
//Frequently Asked Questions
Can you fully cover an arched window without blocking the arch?
Yes. Custom-template plantation shutters and specialty-shaped cellular shades follow the exact contour of the arch, providing full coverage from sill to peak without a flat horizontal line across the curved portion. The shutter or shade is fabricated from a cardboard template that our team creates on-site during your consultation, tracing the exact curve of your specific arch. This ensures the treatment matches the window opening precisely, preserving the architectural character that makes the arch a design feature while adding functional light and privacy control. Fixed arch treatments remain stationary for consistent coverage, while the rectangular portion below can be operable with adjustable louvers or a retractable shade.
How do you preserve historic millwork when installing window treatments in Marin County homes?
Bay Blinds uses non-invasive mounting techniques that protect original millwork on historic homes. For arched and specialty windows in Mill Valley’s Grant Avenue Historic District and similar preservation zones, we mount treatments inside the window frame using compression brackets or shallow screws in concealed locations that do not damage decorative trim, casings, or sills. When working with listed or historically significant properties, our team coordinates with the Mill Valley Historical Society and the homeowner’s preservation guidelines to ensure every installation meets period-appropriate standards. We have successfully fitted treatments on 1890s Queen Anne Victorians, 1908 Craftsman bungalows, and early 1900s farmhouses without compromising original architectural elements.
What is the best UV protection for oddly shaped windows?
For maximum UV protection on specialty-shaped windows, custom-cut solar shades with UV-blocking fabric are the most effective option, blocking up to 99% of harmful ultraviolet rays regardless of window shape. For arched windows where a retractable shade is impractical, fixed plantation shutters with UV-resistant coatings provide permanent protection with adjustable light control through louver positioning. Cellular shades in specialty shapes offer a middle ground: the honeycomb construction provides UV filtering plus insulation, and the shade can be custom-cut to fit arches, angles, and trapezoids. Bay Blinds evaluates the UV exposure, window orientation, and interior contents during the consultation to recommend the treatment that provides the right level of protection for your specific situation.
How do you measure specialty-shaped windows accurately?
Specialty-shaped windows require on-site templating rather than standard tape measurement. Our design team creates a full-size cardboard template of every arched, angled, circular, and trapezoidal window during the consultation visit. The template captures the exact curve, angle, or radius of the opening - including any irregularities from settling or original construction variations that a simple width-by-height measurement would miss. This template is sent directly to the fabrication facility, where the treatment is built to match. The result is a shutter panel or shade that fits the window opening precisely, with no gaps, light leaks, or awkward visual compromises. This templating service is included at no extra charge with every Bay Blinds consultation.
Custom Templates for Every Specialty Shape
Free in-home & on-site consultations across Marin County and Petaluma - on-site templating included at no charge.