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CertainTeed Home Additions & ADU: The Orlando Owner’s Guide
If you’re planning a home addition or ADU in Orlando and want CertainTeed materials in the build, the installed price typically runs $45,000 – $130,000 for an addition and $90,000 – $220,000 for a full ADU, depending on square footage, foundation work, and finish level. That’s the honest range you should expect to hear from any contractor who actually shows up and does the work properly. As a general contractor, Penhallow Remodeling Orlando doesn’t sell CertainTeed parts off a shelf like a supply house would. What we do is design, permit, and build additions and ADUs using CertainTeed products where they matter most: exterior sheathing, roofing underlayment, insulation, siding, and trim.
The way most Orlando homeowners reach out to us starts the same way. They’ve got an aging garage or under-used side yard, and they’re weighing whether to build an ADU for rental income or add square footage for an aging parent. The CertainTeed connection usually comes later, once we sit down and talk through what materials will hold up in Central Florida humidity and afternoon thunderstorms.
Key takeaways:
- Penhallow Remodeling Orlando is an independent general contractor. We’re not affiliated with CertainTeed, and we don’t represent ourselves as a CertainTeed dealer or warranty center.
- We plan permit-ready additions and ADUs in Orlando and use CertainTeed products where they’re the right call for the build.
- Every project gets a written price in our contract before any work starts, a written 365-Day Done Right Promise, and a defined arrival window.
Which CertainTeed Products We Use in Home Additions & ADUs
CertainTeed makes a long list of building products, but only a handful belong in a typical Orlando addition or ADU. We narrow it down to what performs in this climate and what matches the structure you already have.
Siding and trim: CertainTeed’s vinyl siding lines, like Monogram and Cedar Impressions, hold up well in Orlando’s wet summers, but they’re not always the best choice for a modern ADU with a stucco exterior. We’ll tell you that honestly. If you’re matching an existing 1960s block house, we’ll likely recommend stucco with CertainTeed membrane and flashing details at the roofline instead of vinyl. If you’re building a traditional detached ADU with a lap-siding look, Monogram 46 is a solid option at roughly $9 – $13 per installed square foot, depending on elevation and accessibility.
Roofing underlayment and shingles: CertainTeed’s Landmark shingles carry a proven track record in Florida, but the underlayment matters more than the shingle in a hurricane zone. We spec CertainTeed roofing felt or synthetic underlayment over a taped deck seam when we’re tying a new addition roof into an existing one. That detail is what keeps a College Park bungalow addition from leaking at the transition line two years in.
Insulation: CertainTeed fiberglass batts are a workhorse in wall cavities and attic spaces. For Orlando’s hot, humid conditions, we usually recommend blown-in CertainTeed InsulSafe or a closed-cell spray foam for the roofline of an ADU, combined with a properly sealed attic. It’s about controlling moisture as much as temperature.
How to know what you’re looking at: If you’re walking a home supply aisle or open-house shopping and want to know if a product is CertainTeed, check the packaging and the product stamp. CertainTeed siding panels carry a molded-in brand mark on the nail hem. Shingles have the CertainTeed name on the cellophane strip and a lot-number sticker on each bundle. If you can’t find a label, it’s probably not CertainTeed.
OEM versus aftermarket: For finish materials like siding and trim, using matching CertainTeed accessories (corner posts, J-channel, utility trim) is worth it. Off-brand trim pieces fade at a different rate than the panels, and two years later you can see the patch from across the street. For structural components like sheathing, plywood and OSB from a reputable mill is fine; CertainTeed’s own sheathing products are good, but they’re not the only acceptable path.
Styles & brands we work with
Signs Your CertainTeed Home Addition or ADU Is Failing
Most of the failures we see on Orlando additions and ADUs aren’t due to materials. They’re due to shortcuts at the transition points where new construction meets old. Here’s what we find when we walk a job that went wrong:
- Roof leak where the addition ties into the original house. The old roofline was cut open, and the flashing or underlayment lap wasn’t done correctly. Water follows gravity into the ceiling cavity. We’ve opened up several of these in Thornton Park and found rotted decking within three years of a “finished” project.
- Uneven floors between the old slab and the new addition. The contractor didn’t account for slab settlement or framed the addition floor at the wrong height. You feel a step or a slope where there shouldn’t be one. That’s a foundation or framing issue that won’t fix itself.
- Cracks at the interior corners where new drywall meets existing walls. The two structures move at different rates with temperature and humidity swings. Without a proper control joint or backer rod, you’ll see hairline cracks in the paint and joint compound.
- Interior condensation on windows and walls in the new space. The building envelope wasn’t sealed properly, and humid Orlando air is getting into the wall cavity. That leads to mold behind the drywall, which you usually smell before you see it.
- Doors and windows that stick or swing open on their own. The header or rough opening wasn’t sized right, or the addition shifted slightly after construction. Sticking doors are often the first physical sign of a framing or foundation problem.
Replacement Cost & What’s Included
Let’s talk about what you’d actually pay for a CertainTeed home addition or ADU in Orlando, and more importantly, what’s in that number.
A ground-up ADU in Orlando runs $90,000 – $220,000, and a stick-built home addition runs $45,000 – $130,000. Here’s what drives the spread:
- Foundation type: A slab-on-grade addition in a flat Orlando backyard is the least expensive path. If your lot slopes or the soil has a high water table, you’re looking at deeper footings, which add $5,000 – $15,000.
- Bathroom and kitchen inclusion: An ADU with a full bathroom and kitchen carries plumbing, electrical, and venting costs that add $25,000 – $50,000 over a basic bedroom-and-bath build.
- Finish level: The same 400-square-foot ADU can cost $95,000 or $185,000 depending on cabinets, countertops, flooring, and fixtures. We install Cambria quartz, KraftMaid cabinetry, Silestone, and other brands we stock regularly, and we’ll show you the per-line pricing before you commit.
Our written quote includes the full scope: permits, demolition, framing, electrical, plumbing, roofing, drywall, paint, flooring, and finish. No change orders on work we specified correctly. If the framing fails within one year, we return under the 365-Day Done Right Promise and fix it at no charge. If we’re off on a measurement, we eat it.
Written by Trevor Nash, Owner, Penhallow Remodeling Orlando, serving Orlando and nearby areas.
See the difference
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AfterDIY or Call Us?
There are places in a home addition where a capable Orlando homeowner can save money, and places where you shouldn’t touch anything. Let me draw that line plainly.
What you can safely do: paint the new walls, install closet shelving, run low-voltage data lines, and hang towel bars in the new bathroom. You can also handle your own landscaping and exterior cleanup after we’re done. These are finish tasks that won’t hurt anyone if done imperfectly.
What you should not do: cut and tie roof rafters, run gas lines for a new ADU kitchen, pull electrical permits, or pour a foundation. Roof work and gas work are genuinely dangerous, and a framing error on a roof means Sheetrock on the ground and someone underneath it. Building code in Orlando requires a licensed contractor for these trades, and for good reason. If you’ve never set a ridge beam, the price of a hospital visit is higher than our labor line item.
If you want someone to give you the number first, then pick up the tool, call (850) 427-6454. We’ll meet you in Orlando, walk the property, and put the full written price in your hand.
FAQs
A properly built addition or ADU with CertainTeed products should deliver 30 – 50 years of structural life, with the roof shingles being the first major replacement item at 15 – 25 years depending on the CertainTeed line and exposure. The humidity in Orlando shortens the life of any unsealed wood, which is why we emphasize proper flashing, ventilation, and moisture barrier details at every transition between new and old construction.
Yes, in many cases. A roof leak at the transition point can often be corrected with new flashing and underlayment for $600 – $2,500, while a sticking door may be fixed by re-shimming or re-setting the frame for $200 – $800. If the foundation is moving or the framing is undersized, we’ll tell you honestly whether repair makes sense or whether you’re throwing money at a structural problem.
A simple 300-square-foot addition typically takes 8 – 14 weeks from permit approval to final walkthrough; a 700-square-foot ADU usually runs 14 – 24 weeks. The permitting process in Orlando adds 2 – 8 weeks before we ever break ground, and we’ll give you that timeline in writing as part of the contract, including the defined arrival window for our crew on day one.
We source CertainTeed products through our regular supply partners and order per project to match your existing home’s dimensions and current code requirements. We don’t store a warehouse of CertainTeed inventory because each build has different framing, roof pitch, and finish needs. When you sign a contract, we place the order immediately so materials are on-site when our crew is scheduled to start.
Get Your CertainTeed Home Addition or ADU Priced in Orlando
If you’re thinking about building an addition or ADU in Orlando and want a straight answer on cost, call Penhallow Remodeling Orlando at (850) 427-6454. We’ll walk your property, talk through the CertainTeed products that make sense for your build, and put the full written price in front of you before you commit to anything. No pressure, no vague estimates, no games.
Written by Trevor Nash, Owner, Penhallow Remodeling Orlando, serving Orlando and nearby areas.
