Bay Window Installation

Welcome to Viviano Window & Door—family‑owned and St. Louis’s trusted bay window dealer for 28+ years. As a local dealer (not a high‑pressure sales outfit), you get clear, written pricing, energy‑efficient options, and professional installation. Enjoy more natural light, added seating or shelf space, and curb appeal—without the sales gimmicks.

Get my free bay window quote See our work

Get Started Your Way

• Get a no‑pressure quote: Tell us about your project and we’ll outline right‑sized options and pricing—clear and in writing, no upselling. Request a free quote.
• Schedule a quick in‑home consultation: We’ll take accurate measurements for a smooth bay or bow installation.
• Visit our showroom:
  
  Viviano Window & Door, 7530 Watson Rd, Shrewsbury, MO 63119
  Hours: Mon–Fri, 8:00 a.m.–4:00 p.m. • Closed Sat–Sun
  
• Prefer to talk it through? Call 314‑353‑8350.

Prefer browsing first? Explore Windows & Doors for styles and options.

What You Can Expect From Us

• Multiple brands to fit your home and budget (Sunrise, Polaris, and more), many made in the USA.
• Energy Star–minded guidance for Missouri’s climate (Low‑E glass, warm‑edge spacers, argon fills).
• True bay and bow expertise: precise measurements, proper support and weather sealing, and clean interior/exterior finishing.
• Custom configurations and styles (flanking casements or double‑hungs, colors, interior woodgrains) to match your home.
• Professionally trained, insured installers who respect your home and clean up when finished.
• A low‑overhead model—more of your budget goes into the window, not marketing—plus straightforward timelines and communication.
• Ask about current specials and financing options.

Ready to bring more light and space to your home? Call 314‑353‑8350, stop by the showroom, or request your no‑pressure quote to get started.

Want to compare products across categories? Visit Our Products or browse Windows & Doors.

Why Choose Viviano for Bay Windows

Choosing a bay window is easier with a local dealer who puts your needs first. We’re family‑owned, have served St. Louis for 28+ years, and keep it simple: real guidance, real value, no pressure. Start with a quick, no‑obligation consultation in your home or at our Shrewsbury showroom—tell us what you’re hoping to change (light, seating, curb appeal, drafts), and we’ll tailor options to fit.

• Consultative, not commissioned: We recommend across brands we trust, like Sunrise and Polaris, so the window fits your home, style, and budget—never a one‑size‑fits‑all pitch.
• Energy efficiency first: We’ll help you read the NFRC label and choose glass and frames that meet or beat Energy Star criteria for our region, balancing U‑Factor, SHGC, and visible light with your comfort goals.
• Straight pricing without games: Keeping overhead low lets us put more into your windows and less into markup—no “today‑only” gimmicks.

Ready to explore your options? Call 314‑353‑8350, request a free quote, or stop by 7530 Watson Rd, Shrewsbury, MO (Mon–Fri, 8:00 a.m.–4:00 p.m.). Want to know who we are and how we work? See our story at About Us. Not sure whether a bay or a bow fits your home? Here’s a quick guide: Bay & Bow Windows.

Bay vs. Bow Windows: The 30‑Second Guide

• Bay windows: Three panels, usually a large fixed center with two angled sides, for a crisp, architectural look. Common angles are 30° or 45°, which create a deeper seat and a more pronounced bump‑out. Around St. Louis, bays suit classic brick bungalows and mid‑century ranches. If you’re picturing a true window seat and a bold profile, a 45° bay is a great fit—ask us to price both angles so you can compare.
• Bow windows: Four to six narrower panels that form a gentle curve. They span wider openings, give a broad view, and soften exterior lines. Great for larger facades or long living room walls. Prefer a panoramic feel without a sharp projection? A bow delivers even light and graceful curb appeal.
• Ventilation options: On both styles, the smaller side panels can open. Choose casement sides for maximum airflow and a clean sightline, or double‑hung sides for a traditional look and flexible top/bottom ventilation.

Rule of thumb: Pick a bay for a bold profile and deeper seating. Pick a bow for even light, wide views, and softer curb appeal. Not sure which is right for your home? Get a quick, no‑pressure design consult and side‑by‑side pricing. Call 314‑353‑8350 or request a free quote. You can also see color chips, glass options, and sample frames at our showroom, 7530 Watson Rd (Mon–Fri, 8–4). Ask about energy‑efficient glass packages and insulated seatboards to keep your new bay or bow comfortable year‑round—It’s The Intersection of Price and Quality®.

See recent local projects in Our Work.

Benefits That Matter in St. Louis Homes

• Brighter rooms and wider views: Angled panels pull in daylight from multiple directions and open up sightlines. Popular in living rooms, dining rooms, and above kitchen sinks.
• Useful interior space: The projection creates a natural spot for a window seat or slim storage bench. We can trim to match existing woodwork for a built‑in look.
• Better ventilation: Operable side units invite a cross‑breeze on mild days and help vent kitchen humidity. Choose casement or double‑hung flankers.
• Year‑round comfort: With the right Low‑E glass for our hot summers and winter cold snaps, bays reduce summer heat gain and winter chill at the glass, so the seat and room stay comfortable.
• Curb appeal and potential resale value: A well‑scaled bay adds interest from the street and can support marketability. Learn more: Will new windows increase my home’s value?
• UV protection: Modern Low‑E coatings help block UV that fades floors, rugs, and upholstery. More here: How new windows help protect floors and furniture from UV damage.
• Noise reduction: Upgraded glass packages can help quiet traffic and neighborhood noise. See: Do replacement windows reduce outside noise?

Curious what a bay would look like in your space or what it might cost? Get a free, no‑pressure estimate or call 314‑353‑8350. You can also stop by our Shrewsbury showroom (Mon–Fri 8–4) to see glass, colors, and seat options in person.

Styles, Configurations, and Options

Every bay or bow we install is built to fit your opening, architecture, and budget. Because we’re a dealer, we can source the angle, operation, colors, and trim details that make sense for your home—without the one‑size‑fits‑all pitch. During a quick, no‑pressure visit, we’ll measure, show samples, and help you compare options so you can feel confident in your choice.

• Angles and projections
  • Bay windows: Usually 3 lites at 30° or 45°. A 30° bay often fits under existing eaves for a cleaner look and minimal exterior work. A 45° bay creates a deeper seat and stronger profile and may need a small roof cover—we’ll design and match materials so it looks original to your home.
  • Bow windows: 4, 5, or 6 lites form a soft curve. More lites give a wider, more continuous view and a graceful exterior line.
• Flankers and operability
  • Side units can be double‑hung (classic look, tilt‑in cleaning) or casement (maximum ventilation and clear views)—we’ll recommend based on room use and airflow needs.
  • Center unit can be fixed for the widest view or operable when airflow is a priority.
  • Screen options match your operable choices.
• Interior/exterior finishes, grids, and hardware
  • Interior: paint‑grade or stainable options (on select lines) to match existing trim. We bring color and wood samples so you can compare in your lighting.
  • Exterior: durable color palettes for brick, stone, or siding to boost curb appeal without constant upkeep.
  • Decorative grids: colonial, prairie, perimeter, and custom—great for tying into your home’s style.
  • Hardware finishes: brushed nickel, oil‑rubbed bronze, and more to coordinate with interior fixtures.
  • Explore more: Decorative Window Options and Finishes • Glass overview: Replacement Window Glass Options Explained.
• Seatboard and finish carpentry
  • Seatboard materials: furniture‑grade plywood with insulated bases to cut cold spots and condensation.
  • Typical seat depth is about 12–24 inches, depending on angle, size, and wall thickness—perfect for plants or a reading nook.
  • Insulation: rigid foam or similar under the seat and within the frame to limit drafts for year‑round comfort.
  • Finish options: paint‑ready or stain‑ready surfaces, with matching interior trim, apron, and sill.
• Roof/cover integration
  • If the window projects beyond the eave, we can add a small roof kit and shingle it to match, or tie the head into the soffit. Proper flashing and sealing keep water out.

  

Comparing frame materials? See Composite vs. Vinyl, Fiberglass, and Wood, Which Window Frame Material Lasts the Longest?, and Best Low‑Maintenance Window Materials.

Have questions about the right angle, color, or operability for your space? Let’s talk through it and price a couple of great options. Call 314‑353‑8350 or request a free, no‑pressure quote.

Energy Efficiency, Explained Simply

Because bay windows project from the wall, they feel the weather more than flat windows. The right glass, gas fill, spacer, frame, and air sealing make the difference in comfort and utility costs in St. Louis. We’ll make the options easy to compare and price out good/better/best so you can choose what fits your home and budget.

• Low‑E coatings: Thin layers that reflect heat while letting in daylight. They cut summer heat gain, help hold winter warmth, and block much of the UV that fades finishes. Quick primer: What is Low‑E glass?
• Double‑pane vs. triple‑pane: High‑quality double‑pane with Low‑E and argon is the best value for most homes here. Triple‑pane improves comfort at the seat, resists winter condensation, and can be quieter. Details: Double vs. triple pane.
• Argon vs. krypton gas fills: Argon is the cost‑effective standard. Krypton is denser and used in very narrow air spaces when chasing the lowest U‑factor. Learn more: Argon vs. krypton.
• Warm‑edge spacers, insulated frames, and tight installation: Warm‑edge spacers reduce the cold band at the glass edge and help limit condensation. Air‑sealing and insulating at the head and seatboard with low‑expansion foam and proper flashing prevent drafts. See how pros prevent leaks: Leak prevention.
• Energy Star and NFRC basics: The NFRC label lets you compare U‑Factor, SHGC, Visible Transmittance, and Air Leakage. Energy Star‑certified packages meet climate‑zone targets: Energy Star and NFRC rating.
• Glass options overview: See what’s available and how to choose: Replacement Window Glass Options Explained.

Simple rule: In most St. Louis homes, Low‑E double‑pane with argon, a warm‑edge spacer, and a well‑insulated seatboard delivers excellent comfort and value. Go triple‑pane or krypton for maximum condensation resistance or very cold, windy exposures.

How We Install Bay Windows (Step‑by‑Step)

Here’s what a typical bay installation with Viviano looks like from start to finish. Our process is designed to be low‑mess, no‑pressure, and built for long‑term performance—so you know exactly what you’re getting before you say yes.

1. Pre‑measure and structural assessment
   We take precise measurements, confirm the projection, verify the load path, and plan how the bay will tie into your wall system—masonry and framed. Why it matters: Accurate measurements • Avoid issues: Wrong‑size orders.



2. Permits and HOA coordination
   If the project changes the exterior look or structure, we help with approvals and paperwork. Learn more: Approvals & permits.
3. Lead‑safe setup for pre‑1978 homes
   We follow EPA RRP rules with containment, HEPA cleanup, and safe work practices. Details: Lead‑paint regulations.
4. Careful removal and opening prep
   We protect floors and landscaping, remove the old unit, correct any framing issues, and integrate sill‑pan and head flashing. Methods: Preventing leaks.
5. Setting the new bay with structural support
   The bay is dry‑fit, shimmed, anchored to solid framing, and supported with engineered cables/rods or approved brackets. We check level, plumb, and square.
6. Air and water sealing
   We insulate with low‑expansion foam and use high‑performance sealants suited to Midwest temperature swings.
7. Interior/exterior trim and seatboard finishing
   We reinstall or replace casing, stool, and apron as needed, finish the insulated seatboard, and complete any exterior capping or trim.
8. Quality check, cleanup, and operation demo
   We test operation, verify weatherseals, clean up, and show you how to care for and use your new window: Operation demo.

Some bay projects need extra planning, such as header changes, tempered glass, or historic approvals. The next section outlines what can affect your installation.

Structural and Code Considerations

• When enlarging an opening or converting a flat window to a bay
  Size changes can require a new or modified header and engineered supports. We flag this at pre‑measure and bring in structural planning when needed—before anything is ordered. More: Structural planning.
• Masonry specifics common in STL
  Brick or stone homes use steel/masonry lintels that must stay intact. Changes may need selective masonry work to preserve support, weeps, and flashing. Details: Brick/stone removal and Stucco/masonry treatment.
• Safety glazing (tempered glass) requirements
  Codes require tempered glass in certain locations, such as near floors or doors, or in large panes with low sills. Learn more: Tempered glass and When codes require it.
• Interior trim and drywall impacts
  Insert installs aim to leave trim in place. Full‑frame conversions or size changes may require trim rebuilds or minor drywall work. What to expect: Trim/drywall FAQ.

Transparent Pricing and Financing

Every bay or bow window is custom, so your price depends on a few predictable variables. You’ll get a written, line‑by‑line estimate with clear options—no one‑call‑close pressure. We’ll also show cost‑saving alternatives and good/better/best choices so you can decide what delivers the right look and performance for your budget.

What drives the cost

• Size and projection depth
• Configuration (3‑lite bay vs. 4–6‑lite bow)
• Angle of projection (30° vs. 45°) and whether a roof or soffit tie‑in is required
• Glass package (Low‑E, gas fill, spacers, laminated/tempered, double vs. triple pane)
• Frame material and brand (vinyl, composite, fiberglass, or wood‑clad)
• Finish carpentry and exterior integration (seatboard, trim, capping/rooflet)
• Installation scope (insert vs. full‑frame) and code items (tempered, lead‑safe)

Local context for typical ranges in our market: Window replacement cost in St. Louis. Bay and bow projects usually land toward the higher end because they include multiple units plus the projecting structure and finish work.

Material research for budgeting: Composite vs. Vinyl/Fiberglass/Wood • Which Material Lasts Longest? • Are Wood‑Clad Windows Worth It?

Financing and current specials
Financing options • Current promotions
Ask us to show estimated monthly payments and how any promo or financing applies to your exact configuration (subject to credit approval). We apply discounts up front—no gimmicks.

Ready for clear numbers? Request a no‑pressure quote for a written, line‑by‑line estimate, or call 314‑353‑8350.

Project Gallery: Bay & Bow Inspiration

See real St. Louis bay and bow installations—and how the right design transforms both room and façade. As you browse, picture the added daylight, cozy seating, and curb appeal in your own home. Like a look? Send us the link or a screenshot and we’ll price that configuration for your space—no pressure, no obligation.

• Before/after transformations: Brighter living rooms, kitchen nooks with bench seating, refreshed front elevations.
• Seatboard details: Insulated seatboards, stain‑grade vs. paint‑grade, apron/skirt profiles, and trim that blends with existing woodwork.
• Exterior finishing and masonry tie‑ins: Rooflets, color‑matched capping, and integration with brick or stone for a watertight, polished finish.
• Configurations: 30° and 45° bays; 3‑lite bays with operable double‑hung or casement sides; 4‑, 5‑, and 6‑lite bows for wide, gentle curves.

Explore more: Galleries • Bay & Bow styles • Our Work
Get a free, no‑pressure quote: Start here • Or call 314‑353‑8350 • Visit our showroom (Mon–Fri, 8:00–4:00).

Warranties and Ongoing Service

Enjoy peace of mind—your bay window is protected by the manufacturer’s product warranty and Viviano’s workmanship warranty. If service is ever needed, start with us and we’ll coordinate with the factory so you don’t have to.

What manufacturers typically cover

• Frame and sash coverage for manufacturing defects
• Insulated glass unit (IGU) seal failure
• Hardware and moving parts
• Finish/color protection where applicable
• Transferability on certain lines

Exact terms vary by brand and model; we’ll provide documents with your quote and contract and walk you through the highlights. More: Replacement window warranties • Made in the USA

Viviano’s installation warranty
We back our workmanship with a written installation warranty. If an issue arises from installation—such as air or water infiltration or operation problems related to fit—call us first. Our local St. Louis team will return to diagnose and correct it.

How service works (St. Louis area)

1. Contact us: Call 314‑353‑8350 or use our Contact Us page.
2. Diagnose first: If it’s a manufacturer issue, we’ll file the claim, order parts, and keep you updated.
3. Parts and glass support: We service hardware, weatherstripping, sash components, and insulated glass.
4. Schedule and complete: After parts arrive, we schedule service during regular hours and verify operation on completion.
5. Costs: If covered under warranty, there’s no charge for covered work. If not, we’ll provide straightforward pricing before we proceed.

Bay Window FAQs

Can I convert a flat window into a bay or bow?

Often yes. In many homes we can replace a flat window with a projecting bay or bow of the same width without major framing changes. Larger or new openings require a review of load paths, header sizing, and exterior clearances, especially on brick or stone facades. Support cables/rods, proper seatboard insulation, and watertight flashing are part of the scope. More detail: Add a new window and Make a window bigger.

Do the side units open? What’s the difference between double‑hung and casement flankers?

Yes. Casement sides swing out, seal with a compression gasket, and give wide‑open ventilation. Double‑hung sides slide up and down, have a classic look, and tilt in for cleaning. We’ll help you choose based on airflow, style, and reach.

Will it feel drafty?

A well‑built bay should feel like the rest of the room. We specify insulated seatboards, sill‑pan flashing, low‑expansion foam around the frame, and high‑quality sealants. Low‑E glass with argon and warm‑edge spacers reduce heat transfer and cold‑glass chill. Learn more: Low‑E glass • Energy Star.

Can I add storage beneath the window seat?

Yes. Options include a hinged lift‑top, cabinet doors, or drawers. We keep the seat insulated, maintain a continuous air/vapor barrier, and avoid blocking supply vents. Ask us to include storage options and trim styles in your quote.

How long does installation take once the unit arrives?

Most straightforward bay or bow replacements take 4–8 hours. Larger openings or extensive trim/roof tie‑ins take longer. Install‑day timing: How long installation takes. Lead times from contract to install vary by season and product: Typical turnaround time.

Is winter installation OK in St. Louis?

Yes. We work one opening at a time, set temporary barriers, protect floors, and seal as we go. Materials cure in cold weather, and we schedule around severe conditions. More: Winter replacement • Best time of year.

Will installers work inside my home? What should I move or protect beforehand?

Yes. Please clear a 3–4 foot area around the window, remove blinds/curtains, and move nearby furniture and decor. We protect floors and work areas, and can help if large items need moving. Helpful prep: Work inside • Remove furnishings • Prepare your home.

What happens to my old windows?

We remove and haul away old units. We recycle what we can and dispose of the rest properly. Want to keep anything? Tell us before installation. Details: Old windows after replacement.

Local Proof and Trusted Brands

See real customer feedback: Read reviews from St. Louis homeowners on our Testimonials page.

• Energy efficiency: Energy Star–minded glass packages and warm‑edge spacers tailored to Missouri’s climate.
• Made in the USA: Many of our lines are manufactured in the U.S.
• Clear comparisons: We’ll show you real NFRC labels and explain U‑Factor, SHGC, and glass options so you can compare performance and price—no hype.

Brands we carry, chosen for you: Examples include Sunrise and Polaris, among others. We recommend the configuration that suits your home, style, and budget—no quotas. Browse a sampling in Our Products.

See it in person
Visit our showroom to compare bay and bow displays, finishes, glass options, grids, and hardware:

Ready to Plan Your Bay Window?

• Get a no‑pressure quote: Request it online or call 314‑353‑8350. Estimates and consultations are free. What’s included: Free estimates • What happens during a visit.
• Visit our showroom: 7530 Watson Rd, Shrewsbury, MO 63119. Hours: Monday–Friday, 8:00 a.m.–4:00 p.m.; closed Saturday and Sunday.
• See financing options: Financing and Payment methods/plans.
• Browse current specials: Promotions (call 314‑353‑8350 for details).

Get my free quote See our work Browse Windows & Doors

We’ve been family‑owned and local for 28+ years. No one‑call‑close tactics—just straightforward options that balance price, performance, and curb appeal. Ready to chat about your bay window? Call 314‑353‑8350.