Window Screens, Casings, and the Small Jobs Bigger Companies Skip

Yes. A screen tear, a chewed-up piece of casing, or a corroded aluminum window frame doesn't require buying a whole new window, and a company that actually does repair work can come out just for that. The catch is that a lot of replacement-focused companies quietly won't take a job that small, so this post covers who does that kind of work and what it actually involves.

We get calls fairly often from people who are almost apologetic about it. "I know this is a small thing, but..." is how a good chunk of our screen and casing calls start, and it always makes us wonder how many other companies they called first that either quoted a full replacement or just never called back. It's a fair question to ask before you pick up the phone: does the number you're calling actually do the $150 job, or does it only do the $15,000 job and hope you'll upgrade once someone's standing in your driveway.

Why small jobs get skipped in the first place

This isn't a mystery and it isn't really anyone being lazy or dishonest, it's just how the math works for a lot of outfits. A crew, a truck, and a service call cost roughly the same amount of gas and scheduling whether they're driving out to re-screen one window or install fourteen new ones. A company set up around full-house replacement sales has salespeople, financing partners, and installation crews built around big-ticket jobs, and fitting a $150 screen repair into that machine is genuinely inefficient for them. So a lot of them either decline outright, quote a price so high it stops being worth it to you, or send a salesperson out who spends the visit gently steering the conversation toward "while we're here, have you thought about doing the whole house."

None of that makes those companies bad at what they actually do, full replacement is a real specialty and plenty of people need exactly that. It just means the small jobs, screens, casing, a single stubborn aluminum window, end up falling into a gap that doesn't get much attention. If you've read our page on repair versus replacement, you already know our position on this generally, we do both kinds of work, and that includes work this small.

Window screens: repair vs. rebuild

Screens fail in two fundamentally different ways, and knowing which one you've got tells you what the fix actually costs. The first is mesh damage, a tear, a puncture from a cat or a branch, mesh that's gone loose and baggy in its frame after years of sun exposure. If the aluminum or fiberglass frame around the mesh is still straight and the corners are still tight, this is a re-screen. The old mesh gets pulled out, new mesh gets stretched across the same frame with a spline roller, and the frame goes back in the same track it came out of. It's genuinely one of the fastest, cheapest repairs in this whole trade.

The second failure is the frame itself, bent aluminum from a window that got slammed, a corner joint that's pulled apart, a frame that's warped enough that it no longer sits flat in the track. New mesh in a bent frame just tears again or lets bugs in around the gap, so that's a full new screen frame, not a re-screen. For a standard window size, a common double-hung or slider opening, that's usually an off-the-shelf part or a quick custom-cut frame from stock aluminum. For older homes with windows built to dimensions nobody standardized decades ago, or a custom-sized opening from a past renovation, the screen has to be built to match the actual opening, which is one more reason a generic hardware-store screen kit often doesn't fit right on an older house. This comes up a lot on the kind of homes we cover in our piece on windows and doors in older homes, where almost nothing in the opening is a size you'd find on a shelf.

This Old House has a decent rundown of the basic mesh-replacement process if you want to see the mechanics of it yourself before deciding whether it's a DIY job or not, you can find that on This Old House. For a standard frame in good shape, re-screening is honestly a reasonable weekend project for someone comfortable with a utility knife and a spline roller. Where it stops being a good DIY candidate is exactly the custom or bent-frame situation described above, because cutting mesh for a frame you also have to rebuild is a different skill level entirely.

Casing and trim: more than cosmetic

Casing is the trim that wraps the window or door opening, the flat or profiled boards you see framing the glass on the inside and sometimes the outside of the house. It's easy to think of it as purely decorative, the thing that makes a window look finished instead of like a hole with glass in it, and cosmetically that's true. But casing also does real physical work at the edges of the opening. It covers and protects the gap between the window frame and the rough framing of the wall, and depending on the installation, it's often tied into the caulk, flashing, and insulation that make up the actual air seal around the unit.

That's why cracked, rotted, or gapped casing isn't only a cosmetic complaint. When casing pulls away from the wall or rots through, it opens a path for air and sometimes water to get behind the trim and into that gap between window and framing, the same gap the casing was covering in the first place. We've been out to plenty of houses where someone was convinced their window itself was drafty, had it checked, and the window performed fine, the actual draft was coming from a cracked seam in the casing letting outside air straight into the wall cavity. If a room feels drafty near a window that seems to operate and seal normally on its own, the casing is worth checking before you assume the window is the problem. That's part of the broader diagnostic approach we walk through in our guide to diagnosing window problems.

Casing repair itself ranges from patching a small rotted section with epoxy wood filler, appropriate when the damage is limited to an inch or two of soft wood, up through cutting out and replacing an entire run of trim when rot has traveled along the board. It's also, in most cases, a job that can be done without touching the siding at all, since casing sits inside the siding's edge rather than under it. Whether that holds for your house depends on exactly how the original trim detail was built, which is part of why this is worth a look in person rather than a guess over the phone.

Aluminum windows: the material nobody talks about

Most of what gets written about window materials online is vinyl versus wood versus fiberglass, and aluminum barely gets a mention, even though it's a common material on mid-century houses, older additions, sunrooms, and porches around Lancaster County. Aluminum has its own set of rules, and they're different enough from vinyl and wood that treating an aluminum window like either of those leads to bad decisions.

Aluminum doesn't rot. That's a genuine advantage over wood, an aluminum frame that's been sitting in a damp sunroom for thirty years isn't secretly turning to mush the way a wood sill would be. But aluminum does corrode, and on older windows without a protective finish or anodized coating, you'll often see white, chalky pitting on the surface, especially near the sill where water sits longest. That corrosion is a surface and finish problem more often than a structural one, and it's frequently something that can be cleaned, treated, and refinished rather than replaced outright.

The bigger issue with aluminum is thermal bridging. Metal conducts cold far more efficiently than vinyl or wood, so unless an aluminum frame has a thermal break, a strip of non-conductive material interrupting the metal path from outside to inside, cold outdoor air essentially travels straight through the frame into the room. That's why an older aluminum window can feel drafty right at the frame itself even when the glass and weatherstripping are both doing their job correctly. It's not a leak, it's physics, and no amount of caulk fixes a metal frame acting like a heat sink. This matters for repair decisions too. A hardware failure, a corroded track, a broken latch, on an aluminum window is usually a straightforward repair, since the frame material itself typically isn't the failure point. But if someone's actually bothered by the cold coming off the frame itself in winter, no repair changes that, since it's the aluminum conducting cold, not a broken part, and that's a case where replacement with a thermally broken frame or a different material actually solves the complaint that repair can't touch.

Aluminum window installation, when it's the right call, follows the same fundamentals as any other material: a square, properly flashed opening, correct fasteners for the frame material, and a continuous air seal around the perimeter. The frame itself is more rigid than vinyl and less forgiving of an out-of-square opening, so the rough opening needs to be checked and corrected carefully rather than assuming the frame will flex to fit the way vinyl sometimes can. If you're weighing whether an aluminum window on an older addition is worth repairing versus replacing, that decision runs on the same logic covered in our post on single-pane windows, since a lot of older aluminum units are also single-pane, and the two issues, material and glazing, often show up together.

Common mistakes

A handful of habits turn these small jobs into bigger, more expensive ones, and we see the same few patterns often enough that they're worth naming directly.

• Buying a generic hardware-store screen kit for a custom or older-house frame. Big-box screen kits are built around standard modern window sizes. On an older home where the opening doesn't match anything standardized, a generic kit either doesn't fit the track at all or gets forced in and pops back out within a season. Measuring before buying saves a second trip to the store and a second attempt.
• Painting over rotted casing instead of cutting it out. Paint hides soft wood for a while, but it doesn't stop the rot underneath from spreading, and by the time it shows through the paint again, the damage usually extends further along the board than it did originally. Cutting out the compromised section and splicing in new material costs less the earlier it's done.
• Assuming an aluminum window can't be repaired and jumping straight to replacement. A stuck latch, a corroded track, or a worn weep hole on an aluminum window is very often a contained repair, not a sign the whole unit is done. Replacement makes sense when the complaint is genuinely about the frame's thermal performance or when the frame itself is bent or structurally compromised, not just because the window is old and made of a less-discussed material.
• Ignoring a torn screen until the mesh is basically gone. A small tear stays small for a while, then it doesn't, once pets, kids, or wind get a starting point to work from. A re-screen while the frame is still in good shape is a cheap, fast fix. Waiting until the frame itself has warped from being pushed on or left half off the track turns it into the bigger repair.