A dark hallway, a bathroom with no natural light, a blank wall in the room you actually want to sit in. Adding a window can change how a house feels more than almost any other single project. It is also a different kind of job from replacing an existing window. Replacing swaps one unit for another in a hole that already exists. Adding means cutting a new opening in a wall that was built without one.
In most houses it can be done. Whether it is simple or involved depends on what the wall is made of, what the wall is holding up, what is hidden inside it, and what your city, county or HOA requires. Here is how to think it through before you call anyone.
Start with the exterior wall
The outside surface of the wall has a lot to do with how much work a new opening takes.
Siding
Wood, fiber cement and vinyl siding are the most forgiving. The siding can be cut back, the opening framed, and the siding trimmed neatly around the new window. If you are also thinking about new siding, doing both at the same time makes the patchwork disappear.
Brick and stone veneer
Many houses in Round Rock, Cedar Park, Georgetown and the rest of the suburbs have brick or stone veneer on at least the front. Many older central Austin homes have limestone. Cutting a clean opening in masonry is skilled work. The masonry above the new window needs support, usually a steel lintel, and the cut edges have to be finished so they look intentional. Matching brick or stone for any patching can be the trickiest part, especially on older homes.
Stucco
Stucco can be cut, but patching it so the texture and color blend takes care. Expect some visible difference until the wall is repainted.
What the wall is holding up
Every opening in a wall needs a header, a beam across the top that carries the weight that the studs used to carry. Exterior walls are often load-bearing, supporting the roof or a second floor. In those cases the header has to be sized for the load, and temporary support may be needed while the opening is cut. Depending on the size of the window and the wall, a structural review by a qualified professional may be needed before any cutting starts. Wide openings, two-story walls and corners call for more caution than a small window in a single-story wall.
Austin’s expansive clay soils add one more consideration. Houses on shifting ground can already have walls slightly out of plumb or cracks above existing openings. A good assessment looks for those signs, because a new opening should not make an existing movement problem worse.
What is hidden inside the wall
Before anyone cuts, find out what runs through that section of wall. Electrical wiring, outlets and switches are common. Plumbing supply and drain lines run through bathroom and kitchen walls. HVAC ducts and returns sometimes sit in exterior walls. None of these makes a window impossible, but moving them means bringing in the right trade and adds to the project.
Permits, codes and approvals
Cutting a new opening in an exterior wall is a structural change, and it commonly requires a building permit. Requirements vary between the City of Austin, the surrounding cities and unincorporated areas of each county, so check with your city or county building department before you plan the project. They can tell you what applies at your address, what drawings they need and what inspections to expect.
A few other rules can come into play:
- A window in a bedroom may have to meet emergency escape requirements on size and sill height. Ask your building department.
- Windows close to a property line, or near a tub, shower or stairway, may have special requirements such as fire rating or safety glass.
- Many subdivisions have HOA rules on window placement, color and grid pattern. Get approval in writing first.
- If your house is in a City of Austin local historic district, changes to the exterior generally need review. Talk to the City’s Historic Preservation Office before going further, and expect street-facing walls to get the closest look.
Where to put it, with our sun in mind
Once you know a window is possible, think hard about which wall it goes in. In Central Texas, a west-facing window brings in strong late-afternoon sun and heat during a long cooling season. North-facing glass gives soft, even light with very little heat. East-facing windows get morning sun, which is gentler. South-facing glass is easier to shade with an overhang or a patio cover.
If the only spot for your window faces west, that does not rule it out. It just makes the glass package more important. Ask about low-E glass and ENERGY STAR qualifying configurations so the new window adds light without adding a hot spot.
Choosing the style
The kind of window should match the room’s job. A fixed picture window works where you want light and a view but no ventilation. A casement or awning window suits a spot above a counter or high on a bathroom wall, where you want air without giving up privacy. In a bedroom that has to meet escape requirements, the opening style affects how large the clear opening is, so check that before you choose. If you want the new window to sit beside existing ones, matching the style and grid pattern keeps the outside of the house looking planned.
How the project usually comes together
An added window is part window job and part construction job. Typically it goes something like this: someone assesses the wall and the location; you check permit requirements and any HOA or historic approvals; drawings or a structural review are prepared if required; the window is ordered to the planned size; the opening is cut and framed with a proper header; the window is installed, flashed and sealed; then the exterior and interior are finished with trim, patching and paint. Depending on the wall, that can involve a framer, a mason, an electrician and a painter as well as the window installer.
When you get quotes, find out which of those steps each company covers and which you will need to arrange yourself.
Alternatives worth considering
Sometimes the goal behind adding a window can be met with less construction. Before you commit to a new opening, ask whether one of these would do the job.
Make an existing window bigger
Enlarging an opening still means structural work, a new header and patching, but it keeps the window where the wall was already designed to have one. Going taller, by lowering the sill, is often simpler than going wider.
Swap the style
A small slider replaced by a picture window of the same size, or a pair of windows joined into one larger unit, can let in noticeably more light. Different frame profiles show different amounts of glass, so the same opening can feel brighter with a new window in it.
Turn a window into a door
If the window you want would face a backyard or patio, a patio or French door in that spot may serve better. It brings in light and gives you a way outside. It is also a bigger structural change, with the same permit questions as a new window.
Check the glass you already have
Old, hazy or heavily tinted glass can make a room darker than it needs to be. New windows with clear, efficient glass sometimes solve a gloomy room without any cutting at all.
What you get for the effort
For a room that feels closed in, more daylight can make a house far more pleasant to live in. A well-placed window can also bring a cross breeze on a spring evening, before the summer heat sets in for good. The cost and complexity vary a lot with the wall and the location, which is why the first step is a close look at the actual spot you have in mind.
We can add the window for you
The Window Source of Austin adds new windows to existing homes, not only replacements. We cut and frame the opening, install the window, then seal and trim it inside and out so it looks like it was always there. Call (512) 524-9455 to schedule a free in-home assessment. We will look at the wall you have in mind, recommend a size and style for the room and tell you plainly what the project involves before any work starts.