Andersen bay window on a Cumberland Center colonial by Cardinal Exteriors

Bay & Picture Windows in Casco, Maine

Bay & Picture Windows for Casco homes from a family-owned Portland company. An owner measures on site and writes a fixed-price proposal.

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Bay & Picture Windows for Casco homes

In Casco, a big window is often the point of the house. Lots on Sebago Lake look south across open water, Pleasant Lake and Thomas Pond have their own shorelines to frame, and inland lots look out over woods and open land. A picture window keeps a view unbroken, and a bay or bow pushes out from the wall to widen it. Casements on either side of a large fixed unit let in lake breezes in summer.

Large glass on the water side of a Casco home takes the worst of the wind, so structural ratings and flashing are the first thing to get right. A bay carries its own small roof, and with about 84 inches of snow a year at the Gray weather office, that roof can hold snow and form ice where it meets the wall unless it is properly flashed and insulated. South-facing glass on the Sebago shore gets strong winter sun, and low-emissivity coatings help with glare and heat. Any change to the size of an opening means structural work, so it should be discussed with the town before work begins.

Large glass window facade on a Yarmouth building

How a Window Rough Opening Gets Flashed

  1. Sill pan — sloped, with dammed ends, so any water that gets past the window drains out, not into the wall
  2. Window unit — set directly on the sill pan before the sides are fastened
  3. Jamb flashing tape — laps over the sill pan on both sides, in the order water will travel
  4. Head flashing — tucks under the weather-resistive barrier above the opening
  5. Drainage — every layer sheds down and out, never behind the one below it
Large-format picture-style windows on a Yarmouth building

Casco housing at a glance

Census estimates count about 2,970 housing units in Casco, with a median year built of 1988, noticeably newer than Raymond's 1976. Only about 5 percent predate 1940 and around 18 percent predate 1960, while roughly 31 percent have gone up since 2000. About 76 percent are single-family detached homes, a lower share than in neighboring Raymond, and about 90 percent of occupied homes are owned by the people living in them. Seasonal use is large: roughly 1,210 units, about four in ten, are held for seasonal or recreational occupancy, from shoreline cottages to second homes. The town also runs a short-term rental registration ordinance, since many lake houses are rented by the week. The older layer is small but real, including a Federal-style house from about 1795 in South Casco.

Casco neighborhoods and architecture

Casco was set off from Raymond in 1841 after starting as part of Raymondtown Plantation. Its settled places are Casco village, South Casco, Cook Mills, Crescent Lake and Pike Corner. The Friends Meetinghouse on Quaker Ridge Road, built in 1814, is a modest one-story frame building with narrow clapboard siding and is on the National Register, as is the Richard Manning House, a Federal-style home of about 1795 on Raymond Cape Road in South Casco. Sebago Lake State Park, opened in 1938, spans Casco and Naples, and summer camps such as Seeds of Peace and Camp Laurel South sit on its lakes. Casco Days fills the last Saturday of July.

Permits and design review in Casco

Casco's Code Enforcement Department, which the town calls its building department, works from the town office at 635 Meadow Road and meets by appointment. Since April 7, 2025 the town enforces the 2021 I-codes under Maine's uniform building code. The building permit application asks whether a lot is in shoreland, water body, wetland or resource protection zoning, wants a plot plan with roadside and lakeside setbacks, and records lot coverage. Permits are valid for one year. Work in the shoreland zone, within 250 feet of a great pond, uses a separate Shoreland Project Permit Application with photos before and after construction.

Casco at a Glance

What the housing stock and local code enforcement mean for a siding, window, roofing or deck job here.

3,696

Population (ACS estimate)

Median year built: 1988

Homes built before 19405%

Mostly vinyl or fiber-cement siding and insulated replacement windows from recent decades.

State Building & Energy Code (MUBEC)

Local option — population under 4,000

EPA Lead-Safe Rule (pre-1978 homes)

Applies to at least 18% of homes here

Shoreland Zoning

Applies near the water

Permits

Casco Code Enforcement Office

Codes & Permits for Bay & Picture Windows in Casco

In Casco, exterior-work permits come from the Casco Code Enforcement Office (635 Meadow Road, Casco, ME 04015, 207-627-4515, ext. 1203). Casco sits at or under the 4,000-resident line where MUBEC enforcement is a local option rather than a state mandate.

  • A fixed picture window does not itself satisfy IRC R310 egress for a bedroom; if a bay/picture window is installed in a sleeping room, the room still needs a separate code-compliant egress window or door meeting the R310 opening/sill dimensions elsewhere in the room. up.codes
  • Bay windows project beyond the wall plane and typically require additional structural support (headers sized per the applicable IRC span tables, and often a knee-wall or bracket support system) beyond what a standard flat-wall window opening needs — sizing should follow the IRC's header/span-table provisions and, for the bay's roof/floor cantilever, engineered or manufacturer-specified support rather than a simple in-wall header swap. up.codes
  • The same Climate Zone 6A / U-factor 0.30 fenestration requirement applies to bay and picture window units as to standard replacement windows under Maine's adopted 2021 IECC. up.codes
  • Maine's Shoreland Zoning Act creates a regulated shoreland zone extending 250 feet (horizontal distance) from the normal high-water line of any great pond, river, or coastal wetland, and 75 feet from certain streams; the Act's stated purposes include protecting buildings and land from flooding/erosion and controlling water pollution, and it governs deck and other structure setbacks and the expansion of nonconforming structures within that zone (specific setback/expansion rules are set at the municipal-ordinance level under the state's model guidelines). maine.gov

How Cardinal Exteriors Handles Bay & Picture Windows in Casco

  • Whatever we install for a bay and picture windows job in Casco is rated to Climate Zone 6A's 0.30 maximum U-factor, the energy-code ceiling Maine adopted statewide.
  • With 18% of Casco's housing built before 1960, a real share of that stock predates 1978 as well, which means EPA lead-safe containment is part of bay and picture windows on an older Casco home more often than not.
  • With 3,696 residents, Casco falls below the threshold for mandatory statewide code enforcement, but that doesn't change the permit and inspection Cardinal builds to on every job here.
  • Anything that needs a permit for bay and picture windows goes through the Casco Code Enforcement Office.
Casco, ME
The entrance to the Point Sebago Resort area on Point Sebago Road in Casco, near Sebago Lake.
Street View © Google

What bay and picture windows involves

Picture windows are large fixed units that frame a view and pour light into a room. Bay and bow windows project out from the wall, adding floor space and light from three or more directions. Both are heavier and more exposed than an ordinary window, so the structure, support, roof and flashing around them matter. The Cumberland Center colonial on this site received Andersen 400 Series bay, double-hung and picture windows.

  • The opening, header and framing are checked; widening an opening may need a new header.
  • Bay and bow units are supported with cables, brackets or a framed seat so they do not sag.
  • The small roof over a bay is flashed into the wall and roofed or capped to match the house.
  • Insulation goes into the seat and head so the projection is not a cold spot.
  • Interior seat boards, casing and exterior trim are finished to match.

Signs it is time

  • A view you want to see more of from the main living space
  • An old bay that sags, leaks at the roof, or feels cold at the seat
  • Fogged glass in a large fixed unit
  • A dark room that needs more daylight

What affects the price of bay and picture windows

  • Size and configuration: picture, bay or bow, number of units
  • Whether the rough opening changes size
  • Support method and seat or roof finish
  • Glass package and brand
  • Interior finish carpentry

Every job is priced from a free on-site visit. Typical ranges for the trade are on our window replacement page, and the details of this service are on the bay and picture windows overview.

For a deeper walkthrough of materials, code details and photos, see our full Bay & Picture Windows: The Structural Support Most Homeowners Never See guide.

Get a free bay and picture windows estimate in Casco

Tell us about the house and what you want changed. One of the owners will call to set up a visit, measure, and write a fixed-price proposal. No pressure, no obligation.

Need it today?Call Mike (207) 408-5388

or Bob at (207) 252-0759