Bay and Bow Windows That Add Light and a Seat

What is the difference between a bay and a bow window?

A bay usually has three units: a large fixed picture window in the center and an operable window on each side, angled out from the wall, often at 30 or 45 degrees. A bow uses three to six equal-sized units set in a gentle curve.

The side windows can be double-hung or casement, whichever you prefer to open. A bay makes a deeper nook with flat, angled sides; a bow spreads the view across more panes.

How is a bay or bow window put together?

The window units are joined into one assembly, with a head board across the top and a seat board at the bottom. On the Alside and Simonton bays we install, those boards come in oak or birch veneer (Simonton’s can be painted or stained to match your trim), and both offer an insulated seat board.

Because the assembly hangs out past the wall, it has to be supported. Alside’s units, for example, hang on an adjustable turnbuckle cable system tied into the framing above.

Can you put a bay or bow where I have a flat window now?

It can be done. A bow window can go in where a picture window is now, if you want more light and a ledge.

It is a bigger change than a same-size swap. The new window needs room outside, clear of decks and walkways. Virginia’s permit exemption covers replacement windows that keep the same framed opening and open the same way, so a flat window turned into a projecting one may need a permit. Check the rules for your address; our permit guide for Northern Virginia explains how they work.

If an HOA has to approve the change, it works the same as any window project. We supply the product data sheets and manufacturer color names. We work closely with the committees, we have a great relationship with plenty of HOAs in the area, and it has never been a problem for us.

Are bay windows energy efficient?

They can be, if the glass and the seat are right. A bay or bow usually has more glass than a flat window in the same wall, so the glass package matters more than usual.

Compare the U-factor and Solar Heat Gain Coefficient on the NFRC label for the exact unit being quoted; ENERGY STAR’s window guidance explains what those two numbers mean. The other weak spot is the seat. If the seat of your old bay is cold to the touch in January, ask about an insulated seat board.

What warranty comes with a new bay or bow window?

A lifetime warranty, with workmanship covered in full. The glass and parts are covered by the manufacturer’s own warranty, which varies by brand and product line, and we show you the actual terms for the window you are considering. See our window warranties page for the details.

Can you fix my old bay window instead?

No. Sunshine Contracting is a replacement company, and we do not take window repair jobs, except warranty service on windows we installed. If one unit in the bay has fogged glass, a glass shop can usually replace that sealed unit. When the seat is rotting, the bay is sagging, or several units are failing, replacing the whole assembly is the fix.

What do bay and bow windows cost in Northern Virginia?

More than flat windows: one bay can price like three double-hung windows, because it is several units joined with a head board, a seat board and support. The number of units, the brand and frame material, the glass, the board finish, and whether the opening changes all move the price.

Our replacement window cost guide shows typical ranges and what drives them, and there are other options too, so reach out with what you have in mind. Financing is available with approved credit. For other styles, compare casement windows, double-hung windows, garden windows or all of our replacement windows.

Bay and bow window questions homeowners ask us

What is the difference between a bay window and a bow window?

A bay usually has three units: a fixed picture window in the center and an operable window angled out on each side, often at 30 or 45 degrees. A bow uses three to six equal-sized units set in a gentle curve. A bay makes a deeper, squared-off nook; a bow spreads the view across more panes.

How much does a bay window cost compared with a regular window?

More. A single bay can price like three double-hung windows, because it is several units joined together with a head board, a seat board and support. Brand, glass, angle and finish move the number. The estimate is free, and the written price for your opening does not change at the kitchen table.

Can you replace a flat window with a bay or bow window?

It can be done. A bow can go in where a picture window is now. It projects past the wall, so it needs room outside, and it is not a like-for-like swap, so check your permit and HOA rules before you plan on it.

Request a free bay or bow window estimate or call (703) 499-8654.