If the frames themselves are the problem — pitted or chalky aluminum from the 1970s or 80s, wood that's soft at the corners, sashes that won't lock or won't stay up — full window replacement is the right call. If the frame is sound, still square, still locks and operates the way it should, and the only issue is a fogged double-pane seal or a single cracked lite, glass-only replacement fixes the actual problem for a fraction of the cost and disruption. These two options aren't interchangeable upgrades; they solve different problems, and picking the wrong one either wastes money on work you didn't need or leaves the real issue sitting in the wall. Alpine Exteriors looks at the frame condition first on every Tampa Bay estimate, because that's what actually decides which option makes sense — not just the budget a homeowner walks in with.
Full replacement means the entire unit comes out — frame, sash, and glass — down to the rough opening in the wall. The installer re-flashes and seals the opening, sets a new window with a documented Florida Product Approval or Miami-Dade Notice of Acceptance (used statewide as a compliance path), and reconnects it to the exterior finish, which in a lot of Tampa Bay stucco homes means patching and repainting a reveal around the new unit. Because the whole assembly is new, it carries a manufacturer wind-pressure rating tested as a system — frame, glass, anchoring, and hardware together — not just a glass spec. This matters in Hillsborough County, which sits inside Florida's wind-borne debris region even though it isn't part of the High-Velocity Hurricane Zone that applies further south in Miami-Dade and Broward. Full replacement is also the only path to bringing a bedroom window up to current egress sizing if the existing opening is undersized, and it's required if the frame material has failed structurally — you can't rebuild a rotted wood sash or a corroded aluminum frame by swapping the glass. The trade-off is cost and disruption: tear-out, potential stucco or trim repair, and a City of Tampa or county permit are part of the job, not optional add-ons.
Glass-only replacement — sometimes called a sash pack or IGU (insulated glass unit) swap — leaves the existing frame in the wall and replaces just the glass assembly inside it. It's a same-day job in most cases, with no exterior stucco or flashing work, because the frame that's already anchored and sealed never gets touched. This is the right fix when a double-pane window has fogged between the panes (a failed seal letting moisture in, which shows up as permanent haze or condensation trapped inside the glass) or when a single pane has cracked from debris or a storm. What it does not do is change the wind-pressure rating of the window as a system. Impact and wind ratings are certified for the frame-plus-glass assembly as tested, so putting new glass — even laminated impact glass — into an older, non-rated frame does not give you a code-documented impact window; it gives you a frame with better glass in it. It also won't fix a frame that's already out of square, corroded, or leaking air around the perimeter. If the frame is the problem, glass-only replacement is a temporary patch at best.
Cost. Glass-only replacement runs meaningfully cheaper per opening since there's no frame, no exterior finish repair, and less labor. Full replacement costs more per window but bundles in a new frame, new hardware, and often better energy performance, so the comparison isn't apples to apples — you're buying a different scope of work, not just a discount option.
Lifespan. A new insulated glass unit typically holds its seal for a couple of decades under good conditions, but that clock is limited by the frame it's sitting in — if the frame is already 30-plus years old, the new glass will likely outlast it. A full replacement resets the clock on the entire unit, frame and glass together.
Wind rating. Full replacement can carry a current, documented wind-pressure and impact rating as a tested system. Glass-only replacement inherits whatever rating the original frame had — which, for most homes built before Florida's post-Andrew code updates, is none.
Maintenance. New frames from full replacement generally need less upkeep — better weep systems, tighter seals, updated hardware. Old frames paired with new glass still have old hardware, old weep holes, and whatever air-sealing issues they had before, so maintenance needs don't really change.
Appearance. Full replacement lets you change frame color, profile, and grid pattern, plus it resets faded or chalky exterior trim. Glass-only replacement is close to invisible from the street — the frame you already have is the frame you keep.
Housing stock varies enough across the service area that the right answer isn't the same street to street. In South Tampa and Hyde Park, a lot of the bungalow and early-20th-century stock still has original or early-replacement wood or aluminum frames, and homes closer to the bay pick up more salt-laden air, which accelerates corrosion on aluminum hardware and screen frames faster than it would inland — that combination usually points toward full replacement once a frame starts showing pitting or won't seal. Hyde Park's historic district also means exterior changes visible from the street, including window replacement, may need a look from the city's architectural review process before work starts, so it's worth confirming that early rather than after a window is already ordered. Seminole Heights has a similar mix of older housing with some properties inside its own historic overlay, plus more renovated homes where prior owners already installed newer vinyl or aluminum windows — if those are still sound, glass-only repair on a single fogged unit is often all that's needed. Carrollwood, Brandon, and Riverview skew newer, with more homes built from the 1980s through the 2000s carrying vinyl or aluminum-clad windows that are still structurally fine; a fogged IGU here is a textbook glass-only fix. Anywhere near the bay or in a mapped flood zone, it's also worth checking with the permitting office before a large replacement job, since work value can factor into flood-zone substantial-improvement thresholds on some properties. Alpine Exteriors handles the permit filing either way, but knowing which zone a home sits in changes what gets submitted.
Often not, since the exterior opening and structural frame aren't being altered — but rules vary by jurisdiction and by whether the work touches impact glazing requirements, so it's worth a quick permit-desk check before scheduling. Full window replacement almost always requires a permit because it involves the rough opening and a new product approval.
No. Wind and impact ratings are certified for the tested frame-and-glass assembly, not the glass alone. New glass in an old, unrated frame does not create a code-rated impact window.
Glass-only replacement is usually finished in a single visit per window. Full replacement takes longer per opening because of tear-out, flashing, and exterior finish work, and a whole-house job is typically scheduled over multiple days.
Yes, and it's a common approach. Many homeowners replace frames only where they've actually failed — often the ones facing the worst sun or closest to the bay — and use glass-only repair on windows where the frame is still doing its job.
The only way to know which option fits a given window is to look at the frame, not guess from its age. Alpine Exteriors offers on-site evaluations across South Tampa, Hyde Park, Seminole Heights, Carrollwood, Brandon, and Riverview, checking each opening for frame condition, seal failure, and code requirements before recommending a fix — so the scope matches what the window actually needs, not the other way around.