CertainTeed Home Additions & ADU Nationwide

CertainTeed Home Additions & ADU: The Fort Lauderdale Owner’s Guide

We stock and install CertainTeed-compatible siding, roofing, and trim systems for home additions and ADU projects in Fort Lauderdale, with typical installed pricing from $45,000 to $130,000 for additions and $90,000 to $220,000 for detached ADUs. Most CertainTeed material orders arrive within 3-5 business days, and we coordinate delivery to avoid weather delays during our wet season. Homeowners usually discover a material mismatch when their existing CertainTeed siding or roofing can’t be matched for a new addition, or when an ADU permit requires impact-rated products that the original home didn’t need.

Call (754) 254-7676

Which CertainTeed Models This Applies To

CertainTeed’s product lines for additions and ADUs break into three categories: siding (Monogram, MainStreet, Cedar Impressions), roofing (Landmark, NorthGate, Presidential Shake), and trim/millwork (Restoration Millwork, CertaTrim). The critical compatibility issue in Fort Lauderdale is the wind-load rating. Original homes built before 2002 often carried standard 110 mph ratings; post-Hurricane Andrew code and any new addition or ADU now requires 175 mph impact resistance in Broward County. We’ve seen homeowners order Monogram siding in standard thickness only to learn the building department requires Monogram XL for the new structure.

To identify your existing CertainTeed product, check the nail hem for an embossed manufacturing date and product code, or lift a shingle tab to find the printed strip on the underside. For siding, the thickness is stamped on the butt edge in mils. 0.046″ is standard Monogram; 0.050″ is Monogram XL. The OEM-versus-aftermarket decision matters less with CertainTeed than with some brands because their color matching system, ColorMax, is proprietary. Aftermarket vinyl in “close enough” beige won’t pass inspection if the addition shares a wall with the existing structure and the code official flags the mismatch. We source factory-direct to maintain batch consistency, which matters when your addition roof butts into an existing Landmark shingle run.

Signs Your CertainTeed Home Addition or ADU Needs Attention

• Color fading or chalking on south-facing walls. Fort Lauderdale’s UV index averages 6.5 even in winter, and standard vinyl without TiO2 UV blockers degrades faster than the manufacturer spec suggests. We see this first on second-story gable ends where heat buildup accelerates oxidation.
• Shingle tabs lifting or creasing in the first five years. This isn’t always installation error. CertainTeed’s earlier Landmark runs had a known sealant strip issue in high-humidity markets; the adhesive activates but doesn’t set properly when nighttime temperatures stay above 75°F for weeks, which describes July through September here.
• Water intrusion at addition-to-existing wall junctions. The step flashing detail is where most additions fail, not the CertainTeed product itself. We find original contractors who ran the new siding tight to old brick without a proper expansion gap; vinyl moves 1/8″ per 10 feet per 100°F temperature swing, and Fort Lauderdale sees that swing in a single March afternoon.
• Trim separation at fascia corners. Restoration Millwork expands at a different rate than the vinyl siding it abuts. Without a back-to-back miter with expansion space, the PVC trim buckles outward, creating a gap that funnels water behind the frieze board.
• Permit rejection for non-impact-rated materials on ADU applications. Broward County amended the Florida Building Code to require HVHZ (High Velocity Hurricane Zone) ratings on all new detached dwellings. A standard Landmark shingle won’t pass; NorthGate SBS-modified or Presidential Shake IR is required, and the permit reviewer will check the Miami-Dade NOA number on the product label.

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Replacement Cost & What’s Included

Home additions in Fort Lauderdale range from $45,000 to $130,000 depending on whether you’re extending an existing footprint or building up. ADU construction runs $90,000 to $220,000, with the spread driven by utility tie-ins, foundation type, and whether you’re converting garage space or starting from slab. These are flat, written prices delivered before we pull the first permit, not estimates that drift.

What’s included: CertainTeed materials sourced through authorized distribution, permit application and inspection scheduling, removal and disposal of existing structure if applicable, rough and finish carpentry, MEP rough-ins coordinated with licensed trades, and final walkthrough with documented photo record. What drives the range: foundation work (slab-on-grade versus stem wall on fill), impact window requirements, and the electrical service upgrade that most pre-1990 Fort Lauderdale homes need to support a second dwelling unit. Under Clause 1 of the Haven Standard, the price is written before anyone starts. No change proceeds without a signed change order, which is the discipline that has kept our projects within a few percent of the agreed cost across 4,000-plus jobs.

DIY or Call Us?

There’s a short list an owner can safely verify: confirm your existing CertainTeed product code from the nail hem or shingle strip, photograph the area where addition meets existing structure, and check the Broward County property appraiser site for your home’s original build date and wind-load zone. What goes wrong fast: ordering materials from a national distributor without verifying the Miami-Dade NOA is current, installing standard-rated products in an HVHZ zone and facing tear-off at final inspection, or attempting structural connections between old and new framing without an engineer’s letter. The permit path alone for an ADU in Fort Lauderdale involves zoning verification, utility availability confirmation, and fire separation requirements. We handle that documentation as standard. Call (754) 254-7676 and we’ll review your site conditions, existing CertainTeed products, and the permit path. The estimate is free, and we deliver it in writing.

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