Energy-Efficient Windows: Retrofitting vs Full Replacement in Tampa Bay

I’ve heard horror stories from coworkers who used less experienced contractors – windows not sealed right, stucco left a mess, etc. One friend had a crew that apparently never properly sealed around a couple of windows, and during a windy rainstorm, water got in and ruined some drywall 😱. They had to fight to get it fixed. So, adding to what others have said: choose a reputable installer. It might cost a bit more or have a waiting list, but it's worth it.
Given that Karoly and ProTech have been mentioned positively by folks here, they sound like solid picks. I went with a smaller company in Pinellas and got lucky (they did fine), but in hindsight I wish I’d gone with a more known name. At least with an established company, if something goes wrong, they're more likely to still be around and come fix it. Fly-by-night guys might vanish. It's your house – you want it done right.

For those who went through this, did you have to pull a permit for window replacement? I'm aware Florida has regulations about window installations (especially impact ones). Did your contractor handle permits/inspections? I'm just curious if it adds a lot of time or cost to the project. I'm in Pasco County, replacing old windows with likely impact ones, and I want to make sure we do everything by the book (insurance can be picky about that too).

@lindafisher438 Yes, definitely get a permit and inspection for your window project. Any legit window contractor in Florida will handle that for you. The company I used (ProTech Windoors) took care of pulling the permit and scheduling the county inspection. It was all included in the process. The inspector came after the installation and checked a few of the windows to make sure they were installed according to code (they look at things like the anchoring, shims, proper hurricane clips if required, and the window labels to verify they're impact-rated if you claimed they are).
It didn’t add much time – we scheduled the inspection for the day after install was complete, and it passed without issue. Cost-wise, permit fees were in our quote (a few hundred dollars basically). It's important for your safety and legality. Plus, if you ever sell the house, unpermitted window replacements could cause issues. And as you said, insurance might not give you the wind mitigation credits if you can't prove the windows were permitted/approved. So yeah, make sure whoever you hire does the permit.

@lindafisher438 To echo what @slewis17 said, always insist on permits. I know some contractors (or especially handyman types) might offer a slightly lower price to do it without permits, but that's a big no-no. In Florida, window replacements (especially with changing to impact glass) are a structural alteration in the eyes of code. You want that paper trail that it was done correctly. Not to mention, if something goes wrong (like a bad install causing water damage or a window failing in a storm), your insurance could give you trouble if it wasn't done with a permit.
When I did mine, the permit process was straightforward since the contractor handled it. We just had to be home for a short time when the inspector came. He basically tried a few windows, checked the stickers, and signed off. Easy. So don't let any contractor convince you to skip it.

Let’s talk cost a bit more, because that tends to drive the decision. I paid about $700 per window for standard size, non-impact vinyl replacements (insert style) here in Pinellas. That included installation and removing the old windows (we did 12 windows total, and that price was after a multi-window discount). If I had gone with impact glass, it would have been around $1100 per window with the same company. We actually decided to go non-impact to save money and instead we keep our hurricane shutters for storm protection.
Now, if you go to a high-end product or full frame with lots of stucco work, price can go up. I've heard wood-clad windows or fiberglass can be $1000+ each even non-impact. And like others mentioned, the big national companies quote crazy numbers. But roughly, for Tampa Bay area, I'd say expect $600-1000 per window for vinyl, more for other materials, and add a few hundred more per window for impact. So a whole house can be anywhere from say $8k on the low end to $20k+ on the high end depending on choices. It's a wide range, which is why those multiple quotes help.

I'll share my quote experience: Renewal by Andersen (the well-known but pricey option) quoted me about $2,000 per window 😳 for their Fibrex (composite) windows with impact glass. Granted, those are high-end and included full installation, but still, that would have been like $30k+ for my house. No thanks. In contrast, Karoly Windows came in around $900 per window for a similar setup (vinyl frame, impact glass). Needless to say, I went with Karoly and saved a small fortune 😂.
So, it really pays to shop around. Andersen/RBA has a good product but their sales tactics and prices are something else. The windows I got from Karoly are great and came with good warranties. I don't feel like I sacrificed anything except maybe a brand name sticker. Everything is tight, no leaks, easy to open/close. If I only listened to the first quote, I would've either broken the bank or given up on the project. So definitely compare!

@natemusician233 Same here! We had RBA come out just to see, and the quote was outrageous. Renewal by Andersen is always high-end (and they push things like that Fibrex composite, which is fine but not magic). We ended up with a local company (not Karoly or ProTech in our case, another smaller one) and paid maybe 50% of what RBA wanted. No regrets 🙄. My new windows are vinyl double-pane, not composite, but they work perfectly and look nice. Unless you have a historical home or really want wood interiors, you probably don’t need those ultra pricey options in our climate.

Regarding doing all windows at once vs spreading out: we decided to do them all in one go. Partly because once we started, we just wanted it done, and partly because many companies give you a better price per window if you're doing a larger job. It was a big chunk of money at once, but the project was over in two days and we didn't have to revisit it.
The crew came in and knocked out 15 windows in about 2 and a half days for us (full replacements). It was surprisingly efficient. Of course, our house was a bit of a mess during that time (we had to move furniture, take down blinds, etc.), but imagine doing that multiple times if you do a few windows at a time... I preferred to rip off the band-aid. If you can manage the cost or financing, getting it done all at once is less overall hassle. Just my view – if you need to do phase by phase, that's okay too, but prepare for the repeated disruption each time.

I'll share my timeline: We had 10 windows replaced (insert replacements) and the installer did it in just under 2 days with a team of three guys. Day 1 they did like 7 windows, day 2 they finished the last 3 and did finishing touches. It was pretty quick. They'd take one window out, put the new one in within maybe 30 minutes or so, then do the insulation/trim. The longest part was actually some of the exterior capping/caulking to make it look nice.
We had prepped by removing curtains and clearing around the windows inside. They put down drop cloths everywhere to catch debris. There was some dust, but nothing too crazy. By the end of day 2, we had all new windows and just had to do a bit of cleaning and paint touch-ups on a couple of interior trim pieces. I was impressed it wasn't a longer ordeal. I think if it had been full frame replacements, it might've taken a day or two longer plus the stucco work time. But good companies can do even full frames efficiently. Just coordinate so you're ready and can be home to supervise/answer questions during the install days.

Is there any difference in energy performance between an insert window vs a full-frame install of the same window? Like, if I use the same double-pane window model, will it be just as efficient if it's installed inside an old frame versus as a new construction window? I'm wondering if the old frame left in could cause more air leakage or something. Or is it mainly identical results as long as it's done correctly? Essentially: is there an efficiency argument for full replacement beyond what the window itself provides?

@megansnowboarder5105 Good question. If the same window product is used, the efficiency ratings (U-factor, SHGC, etc.) are the same for that window whether it's insert or full frame. The main difference might be in the installation sealing. With full frame, you have the opportunity to insulate around the new window frame (between the window and the rough opening in the wall) really well when you put it in, since everything is open. With an insert, you're putting it into an existing frame, so you have to make sure the gap between the new insert and old frame is sealed (usually with spray foam or backer rod and caulk). A good installer will do that, and then effectively it's similar.
If the old frame was aluminum without a thermal break, technically leaving it in (with an insert) means a bit of that old material is still conducting heat/cold at the edges. But they usually cover or line the frame, and the impact is minimal. I think for most people you'd never notice a difference in energy performance between a properly installed insert vs a full frame replacement of the same window model. It's more about the condition of the old frame (like if it had air leaks). Seal those leaks, and an insert performs great in terms of efficiency.

@megansnowboarder5105 I'll add to what @breezetraveler said from personal experience: we did inserts and the crew did foam insulation around every new window between the insert and the old frame. Then they capped the exterior and caulked inside and out. I have zero drafts now. They basically "sealed in" the old frame. So effectively it's as airtight as a full replacement would have been.
I also worried about the old frame conducting heat, but they put a vinyl wrap over the old metal frame before installing the insert, which I guess acts like a thermal break. Maybe an energy auditor could detect a slight difference at the edges, but in everyday use it's not noticeable. Our house is comfortable and the windows are EnergyStar rated. So yeah, as long as it's installed properly, inserts won’t significantly underperform. Just make sure whoever you hire is meticulous about insulating and sealing all around.

I admit I was a bit paranoid about leaks after install, being in Florida with our heavy rains. But after two big thunderstorms, I'm happy to report no leaks at all with our insert windows. We kept the old frames but you'd never know they’re under there. We had one especially bad storm where rain was blasting the windows for hours – and not a drop inside. That was a relief because one of my old windows used to leak water at the bottom if rain blew directly on it.
So even in terms of water, a properly done insert can be just as good as a new construction window. The keys are good caulking outside, sealing any screw holes, and making sure the sills are pitched or drained correctly. The windows we got had installation instructions the contractor followed to a T. So now I don't worry when I see sideways rain pounding the glass. If you do notice any issues, get them addressed while it's under warranty.

I'll throw in a DIY perspective: I tried replacing one window myself as a test (a small bathroom window). I bought a retrofit vinyl window from Home Depot that fit the opening. Removing the old window was actually not too bad, and putting the new one in was okay, but getting it perfectly shimmed and sealed was a bit of a learning curve. I spent probably 4 hours fussing with it, and I'm still not entirely sure it's as well-sealed as when the pros do it 😅. It looks decent enough and doesn't leak, but the caulking job I did is not as pretty as the others I had professionally installed later.
After that experiment, I decided it's worth paying installers for the rest. If you are super handy and patient, you can save on labor by doing it yourself, but be prepared for a lot of measuring, leveling, shimming, and caulking. And you'll need at least another set of hands for the larger windows. I did feel proud doing one, but for me it wasn't worth the time/stress to DIY all of them.

@cocon47 Kudos to you for giving it a shot. I considered DIY as well (watched a ton of YouTube videos on window installs) but ultimately hired pros for my sanity. 😅 For anyone else thinking about it: one nice thing about using licensed installers is they usually provide a warranty on their work. So if anything leaks or isn't right, they come fix it. If you DIY and something goes wrong later, it's all on you to fix.
Plus, some manufacturers have a clause that the warranty on the window (especially for glass breakage or seal failure) might only fully apply if installed by a professional. Not always, but some do ask for proof of professional install for warranty claims. So that's something to check. For me, not having to worry about those details and knowing the job was done by folks who do this every day was worth the cost.

@cocon47 also keep in mind, permits again – if you DIY, you are still supposed to pull a permit for window replacements (technically as an owner-builder). Some folks skip that when DIYing, but they risk issues. A professional will handle all that. And as mentioned, insurance or resale time, you want paperwork. So while DIY can save money, there are considerations like that.
I ended up doing just my garage window myself (where it wasn't as critical), and hired out all the main house windows. It gave me a feel for how it's done, which was cool, but I didn't trust myself to do the big ones perfectly. And yeah, my caulking lines are not as straight as the pros either. Functionally fine, just not as pretty. 😆

For those interested in warranties: the windows we got came with a lifetime warranty on the frames and glass (lifetime for original owner) which covers any manufacturing defects or seal failures. Our installer (Karoly) also gave us a separate labor warranty (I think 10 years) for any installation-related issues. That kind of combo seems common. ProTech offered something similar when we got their quote. So either way, good coverage if something goes wrong.
Also, many window warranties are transferable to the next homeowner (often for a certain number of years or one transfer). We confirmed that ours can transfer if we sell the house within 20 years, which is nice for resale value. Just make sure to keep all documentation and receipts in case you ever need to make a claim. And register your windows with the manufacturer if they require it for the warranty to be active. It's boring paperwork but worth it.

@jjones18 That's true. I had to use my warranty actually – one of my window panes developed a small crack (manufacturer defect, it appeared a few months after install for no apparent reason). The window company arranged a replacement sash under warranty and swapped it out for me. Didn't cost a dime because it was within that coverage. The process took a couple of weeks but was smooth.
The warranty transfer was also a selling point: we sold our previous house 5 years after installing new windows and were able to transfer the remaining warranty to the buyer. I think it made the buyer feel better knowing they had, say, 15 years of coverage left on the windows. So definitely fill out those warranty cards or online registrations. It can save you headache later.

One aspect that hasn't been touched on much: the immediate boost to curb appeal. Our home in Largo looked kind of tired with the old windows – they had foggy glass (failed seals) and the frames were an ugly aluminum that had oxidized. After we put in new windows, the house looked almost like it had a facelift. Even without doing anything else, new windows made the exterior look fresher and more upscale. Several neighbors complimented the change.
Inside, same deal: the view out is clearer (no foggy glass) and the new clean frames just made the rooms look nicer. It's like upgrading an old pair of glasses to a new one – everything is clearer and the frames are stylish. That aesthetic benefit was a big plus, especially since we were considering selling. I believe the new windows contributed to us getting strong offers (and we highlighted them in the real estate listing as "new energy-efficient windows throughout").

@golfplayer86 Absolutely. We had a similar experience. Our neighbors noticed immediately when we changed out the windows. We went from old bronze aluminum frames (that were faded and some had corrosion near the coast) to new white frames. It gave the house a more modern contrast and clean lines. It's one of those things you don't realize how much it dates a house until you replace them.
On the inside, I also love that our new windows have nice clear glass with Low-E – it has a slight tint which cuts the glare. Visitors have asked if we got new curtains or something because the lighting inside is more pleasant (not so harsh). It was actually the windows reducing the glare and UV. And now we can actually open and close all our windows easily, which is great for the cool days in winter when we want fresh air. The old ones were painted shut or just plain stuck. So it's both aesthetic and functional improvements.