Charleston Window Pros provides professional bay and bow windows in Charleston, SC for residential and commercial properties across the South Carolina Lowcountry. A bay or a bow is not a window in any meaningful sense. It is a miniature addition that happens to be glazed, and that governs how the job runs here, from the review path to the flashing detail to whether we build it at all.
On a reviewed elevation the answer is usually no. Adding a projection to a facade changes the massing, not just the opening, and that is a Board matter rather than a staff matter even before the material question arises. Bays do exist downtown, mostly Victorian and mostly original, but adding a new one to an eighteenth or nineteenth century front is a hard case to argue and we will say so at the first visit.
On the rear of the same house, out of sight of any right-of-way, or on any address outside the districts, a bay is a genuinely good piece of work and we build a lot of them. It buys floor area, it lets light in from three angles, and a seat under it turns a corridor of a room into somewhere people actually sit for an hour.
The part that goes wrong is structural, and it goes wrong slowly. A bay carries its own weight, the roof and anything you put on the seat, all cantilevered off the wall. If the head is not carried on cables to the framing above, or the floor is not supported below, the assembly sags, the sashes bind and the miters open. We look under the existing one before quoting, and check the seat for spring under weight.
The second failure is the roof. A bay roof is a tiny hipped roof with three valleys and a very long horizontal flashing where it meets the wall, sitting under a wall that sheds a lot of water in a place that receives a lot of rain. Step flashing, a proper counter-flashing let into the cladding and a kick at the eaves are not optional.
Insulation is the third. The floor of a bay is exposed to outside air on three sides and the roof cavity above the head is tiny. Left unfilled, both radiate straight into the room and the seat is cold in January and hot in July. Rigid board in the floor and the roof, sealed at the perimeter, fixes it and costs almost nothing while the thing is open.
Bow windows differ from bays by geometry rather than principle. Four to six equal sashes on a shallow arc rather than three units at fixed angles, so a bow projects less and reads softer against a flat wall. On a wide opening it is often the better proportion and it is easier to support, because the load spreads across more mullions.
We will also tell you when a garden window is what you actually want. Small, kitchen-sized, no floor structure, no seat, and a fifth of the cost. If the goal is herbs and light over a sink rather than a room extension, say so and save the money.
Our licensed and insured team brings the right materials and equipment to every job — true divided lites bedded in glazing putty, simulated divided lite bars with a shadow spacer between panes, authentic divided lite fused-pane sash, aluminum-clad and fiberglass-clad wood frames, operable louvered Bahama and panel shutters, 7/16-inch wood structural panel opening protection — and backs the work with a written workmanship warranty. We serve Charleston and nearby communities including Mount Pleasant, North Charleston, Summerville, Goose Creek.
What We Handle
Everything our bay and bow windows in Charleston covers
One crew, one point of contact, and the full range of bay and bow windows work in Charleston, SC. If it is on this list we do it in house rather than handing it to a subcontractor:
- bay windows Charleston SC
- bow window installation
- bay window seat
- bay window roof and flashing
- cable support bay window
- garden window
- bay window headboard
- projecting window addition
- bow window five lite
- bay window insulation
- bay window replacement cost
- copper bay window roof
- bay window structural support
- rear elevation bay window
- bay window sagging repair
Not sure which one describes your situation? Describe it in plain words and we will sort it out — or browse the rest of our Charleston services.
Materials, equipment and how we do bay and bow windows
The difference between bay and bow windows that lasts and bay and bow windows that gets redone in three years is almost always preparation and materials, not the finish you see on day one. We work with true divided lites bedded in glazing putty, simulated divided lite bars with a shadow spacer between panes, authentic divided lite fused-pane sash, aluminum-clad and fiberglass-clad wood frames, spec them to the job instead of to the invoice, and write the material grades into the free estimate so you know exactly what you are buying.
Every Charleston job runs the same way: site walk and measurements, written scope and fixed price, protection of the surrounding area, then the work itself with a daily clean-up. Years of window work in the South Carolina Lowcountry means we have already met whatever your property is going to throw at us — awkward access, older construction, an HOA with opinions.
Where we do bay and bow windows outside Charleston
Charleston Window Pros covers Charleston and the surrounding communities of the South Carolina Lowcountry. Crews run out to the same nearby cities every week, so an out-of-town job does not mean an out-of-town price.
- Bay and Bow Windows in Mount Pleasant, SC — Charleston County, population 90,801 at the 2020 census
- Bay and Bow Windows in North Charleston, SC — Charleston County, population 114,852 at the 2020 census, split across Charleston, Dorchester and Berkeley counties
- Bay and Bow Windows in Summerville, SC — Dorchester County, population 50,915 at the 2020 census, with parts in Berkeley and Charleston counties
- Bay and Bow Windows in Goose Creek, SC — Berkeley County, population 45,946 at the 2020 census
- Bay and Bow Windows in Hanahan, SC — Berkeley County, population 20,325 at the 2020 census
- Bay and Bow Windows in Ladson, SC — Berkeley County, population 15,550 at the 2020 census, partly in Charleston County
Start on the Charleston Window Pros homepage for a free estimate, or call (844) 511-2320 and describe the job.
Why Charleston Chooses Charleston Window Pros
- ✓We quote elevation by elevation, because the Board's purview is visibility from a public right-of-way and the back of a Charleston house is frequently a different product from the front
- ✓Your address gets placed in the district and building-age matrix the BAR adopted in December 2025 before any brand name is spoken, so you learn what is approvable before you learn what it costs
- ✓We will tell you when the wind code is satisfied by protecting the opening instead of replacing the glass, which on an original sash is usually both cheaper and far easier to get approved
- ✓No vinyl quoted where the policy forbids it, and no relabelling a vinyl-cored product as composite to try to slip it past staff
The standards behind bay and bow windows
Quality here is not a matter of opinion — it is written down. The bay and bow windows work we do in Charleston follows published industry standards: NFRC sets the U-factor and SHGC ratings on every window label, and ENERGY STAR defines the efficiency thresholds by climate zone. If a contractor cannot tell you which standard a detail comes from, that is worth asking about before you sign.
Every bay and bow windows project in Charleston gets the same attention, whether it is a single room or a full commercial job. We show up on schedule, keep the site clean, and stand behind the work — the estimate is free and there is no pressure.
Ready to get started? Call (844) 511-2320 for a free bay and bow windows free estimate in Charleston, or request a quote and we'll get right back to you.