Longboat Key is not a typical siding job. It's a narrow barrier island wedged between Sarasota Bay and the Gulf of Mexico, split down the middle by a county line, and built almost entirely on wind-driven salt air, high humidity, and hurricane exposure. A siding product or installation method that works fine ten miles inland on the mainland can fail early out here — swelling, delaminating, or corroding faster than a homeowner expects. That's the specific problem we solve. Alpine Exteriors is a licensed Florida contractor (RB29003900) that installs one siding system, James Hardie fiber cement, because it's the product we trust to hold up to island conditions without the maintenance headaches or moisture failures we've seen from other materials over the years.
This page is about our siding service specifically — how we work, what our warranty actually covers, where we serve, and what a Longboat Key homeowner should expect from start to finish. If you're comparing siding contractors for a home on the Key, here's what sets our process apart.
We don't carry vinyl, LP SmartSide, or any engineered wood siding product, and that's a deliberate decision, not a limitation of what we're able to install. On a barrier island like Longboat Key, the trade-offs of those materials show up faster than they would inland.
Gulf-coast humidity sits in the high 80s and 90s percent for months at a time, and the Key gets salt spray year-round from both the bay side and the Gulf side. Engineered wood products rely on resin-treated wood strands, and once moisture works past the surface coating — at a cut edge, a fastener hole, or a caulk joint that's opened up — the material can swell and soften from the inside out. Vinyl doesn't absorb moisture the same way, but it expands and contracts significantly with heat, and in direct Gulf sun it can warp, fade, or crack at the panel locks over time. Fiber cement is a cement, sand, and cellulose fiber composite. It doesn't rot, it isn't a food source for insects, and it holds paint and color far longer in sustained humidity and salt exposure.
Longboat Key sits in one of the higher wind-load zones on the Gulf coast, with much of the island rated for 150+ mph design wind speeds under the Florida Building Code. Fiber cement panels are heavier and stiffer than vinyl and hold their fastening pattern under wind uplift far better. It also resists wind-driven debris — sand, shell fragments, and storm debris — much better than lighter cladding materials.
James Hardie backs its siding with a 30-year non-prorated limited warranty on the product itself, plus a separate ColorPlus finish warranty when factory-finished products are used, which typically outperforms field-applied paint in a coastal environment. We stand behind our installation work separately — see the warranty section below for exactly what that covers.
Every Longboat Key project follows the same sequence. We don't skip steps to move faster, because on this island the steps that get skipped — flashing details, fastener spacing, county permitting — are exactly the ones that cause problems two or three years down the road.
We walk the exterior with you, check the condition of the existing wall assembly, look for moisture intrusion or rot behind current siding, and identify anything unusual about the structure — stilt or elevated construction, older CBS (concrete block stucco) transitions, or prior storm repairs that need to be addressed before new siding goes on.
Most Longboat Key homes fall into a fairly narrow architectural palette set by neighborhood character and, in many cases, condo association or deed restriction guidelines. We help you select from HardiePlank lap siding, HardiePanel vertical siding, or HardieShingle textured siding, and factory-applied ColorPlus finish colors, matched to what's appropriate for your building and neighborhood.
Longboat Key straddles the Manatee/Sarasota county line, and which building department reviews your permit depends on which side of the line your property sits on. We pull the correct permit for your address, handle the Coastal Construction Control Line review when it applies, and coordinate any HOA or condo association approval before work starts.
We install per manufacturer fastening and flashing specifications for high-wind zones — correct fastener type and spacing, proper starter strip and butt joint flashing, and sealed penetrations at every window, door, and utility fixture. This is where most siding failures actually originate, and it's the part of the job that's invisible once the siding is up, which is why we don't cut corners on it.
We walk the finished exterior with you, check every elevation, and confirm caulking, trim, and paint lines meet our standard before we call the job complete.
Much of Longboat Key's Gulf-facing side falls within Florida's Coastal Construction Control Line, which adds a layer of review for exterior work on top of standard building permitting. We factor this into project timelines up front so it doesn't surprise you mid-project.
A large share of Longboat Key housing stock is condominium or association-governed — Bay Isles, Longboat Key Club properties, and numerous mid-rise buildings along Gulf of Mexico Drive. Many require architectural review board approval for exterior material and color changes before a permit is even pulled. We prepare the documentation, product spec sheets, and color samples associations typically ask for, and we've been through this process enough times on the Key to know what most boards want to see the first time.
A significant number of Longboat Key homeowners aren't on-island full time. We coordinate scheduling, property manager access, and progress updates remotely so a project can move forward whether you're watching it from your driveway or from out of state.
Every home is different, but these are the variables that most affect the cost of a siding project on the Key. We'll walk through your specific numbers at the estimate — this is meant to help you understand what drives the range before that conversation.
| Factor | Why It Matters |
|---|---|
| Home size and wall elevations | More square footage and more complex rooflines (dormers, multiple gables) increase material and labor time |
| Product selection | HardiePlank lap siding, HardiePanel vertical, and HardieShingle textured siding carry different material and labor costs |
| Removal of existing siding | Tear-off and disposal of old material, and any rot repair found underneath, adds time before new siding starts |
| Access and site conditions | Elevated or stilt construction, narrow lot access, and seawall-adjacent sites can affect scaffolding and staging |
| Permitting and association review | CCCL review and HOA/condo approval timelines can extend the project schedule, though this affects timing more than material cost |
| Trim and finish detail | Custom trim work, corner detailing, and factory ColorPlus finishes versus field-painted finishes shift the final number |
James Hardie's manufacturer warranty covers the product — a 30-year non-prorated limited warranty on the siding substrate, and a separate finish warranty on factory-applied ColorPlus color, both of which transfer to a new owner if you sell within the warranty period. Alpine Exteriors separately warranties our installation labor, because a manufacturer warranty on the board doesn't help you if a flashing detail or fastening pattern was done wrong. If something in our installation fails, we come back and fix it. We'll give you the specific written terms for your project at the time of contract — no vague language, no fine-print carve-outs we don't explain up front.
We work the full length of Longboat Key, from the Manatee County line near Longbeach Village and Bay Isles down through the Sarasota County side near the Longboat Key Club and Jewfish Key area, plus the adjacent barrier islands and mainland communities around Sarasota Bay. Because we routinely cross the county line for this island alone, we're familiar with both building departments' permitting requirements and don't treat it as a special case that slows a project down.
If your Longboat Key home needs new siding, a re-side after storm damage, or you're planning ahead of hurricane season and want fiber cement that's built for what this island actually deals with, we'd like to walk your property with you. Reach out for a free, no-pressure estimate — we'll look at your home, answer your questions honestly, and give you a real number, not a sales pitch.
Fiber cement is heavier, requires specific fastener types and spacing to meet Florida's high-wind code requirements, and needs precise cutting and sealing at every joint and penetration. Vinyl installs faster and lighter but relies on interlocking panels that have more room for error in wind performance. The extra labor and skill fiber cement requires is part of why it holds up better long-term on an exposed barrier island.
Ask whether they're licensed in Florida and can show proof, whether they've pulled permits in both Manatee and Sarasota counties (since Longboat Key spans both), and whether they've worked with condo or HOA architectural review boards before. Also ask what specifically their workmanship warranty covers versus the manufacturer's product warranty, in writing.
We install one product line so we can install it correctly and stand fully behind it, rather than spreading expertise thin across materials with different moisture and wind behavior. After years of coastal work, fiber cement from James Hardie has been the most consistent performer we've installed in this climate, so that's what we recommend and back with our warranty.
HardiePlank is horizontal lap siding and is the most common choice for traditional coastal Florida home exteriors. HardiePanel is a vertical sheet product often used for accent walls, gable ends, or a more modern architectural look. Both carry the same core fiber cement durability; the choice usually comes down to the home's architectural style and any HOA guidelines.
Yes — it determines which building department reviews your permit and, in some cases, which flood zone and Coastal Construction Control Line requirements apply to your specific address. We confirm this before submitting paperwork so there's no delay from filing with the wrong jurisdiction.