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Cambria Home Additions & ADU: The Miami Owner’s Guide
Planning a home addition or ADU in Miami with Cambria surfaces built into the design runs $53,100 to $153,400 for the full project, with Cambria countertops and feature walls accounting for roughly $2,360 to $7,670 of that scope depending on square footage. We stock Cambria-compatible fabrication materials and install full additions and ADUs, usually starting within two weeks of your permit approval. Most Miami homeowners discover they need this work when an existing addition starts showing water intrusion at the roofline, or when a garage conversion reveals framing that won’t pass Miami-Dade wind load requirements. Cambria surfaces themselves rarely fail first, but the structure around them does, and that’s where the project scope starts.
Key Takeaways:
- Full home additions in Miami run $53,100 – $153,400; ADU construction runs $106,200 – $259,600.
- Cambria surfaces need proper substrate and structural support, not just a pretty slab on top.
- Miami-Dade wind load codes and flood elevation requirements drive a big part of the cost difference versus other Florida markets.
- We handle the full scope: permits, framing, electrical, plumbing, drywall, and Cambria fabrication and install.
Which Cambria Models This Applies To
Cambria quartz comes in over 130 design collections, and the naming matters less than the slab thickness. We work with three thicknesses on additions and ADUs: 1 cm for vertical feature walls, 2 cm for bathroom vanities and laundry rooms, and 3 cm for kitchen islands and high-traffic counters where Miami humidity and daily use hit hardest. If you’re extending an existing run of Cambria, you need the finish code from the original fabricator. The finish code is stamped on the underside of any overhang or on the back edge. Cambria changes finish names across production years, and matching a 2018 “matte” finish to a 2024 slab sight-unseen is a recipe for a visible seam. We bring physical samples to every estimate, not digital swatches.
One gotcha specific to Miami additions: if your new square footage pushes the project over 1,000 square feet of total new construction, you may trigger forced-air ventilation requirements in the mechanical code that affect where a Cambria backsplash can sit relative to a gas cooktop. We flag this before you commit to a slab layout. It’s not a Cambria limitation. It’s a Miami building code issue that most general contractors won’t mention until the inspector does. Sawyer Remodel Miami is an independent contractor, not affiliated with Cambria, but we have been installing their quartz line for years and know the fabrication tolerances cold.
Styles & brands we work with
Signs Your Cambria Home Additions & ADU Is Failing
- Hairline cracks radiating from sink cutouts or inside corners: The substrate underneath is flexing. Cambria quartz is non-porous and stain-resistant, but it will crack if the plywood or cabinet structure below it moves. In Miami, seasonal humidity swings cause cabinets to expand and contract more than they would in a drier climate.
- Seam separation at the island-to-perimeter joint: The two slab sections were not shimmed to the same plane, or the slab was set before the addition’s foundation finished settling. New additions in Miami’s sandy soil settle more than homeowners expect in the first 18 months.
- Water staining at the roofline where the addition ties into the original structure: This is the single most common failure we see on Miami additions built before 2010. The flashing detail at the roof-to-wall transition was done wrong. Cambria surfaces inside may still look fine, but water is getting into the wall cavity behind them.
- Doors that stick or drywall cracks along new wall intersections: Framing lumber wicking moisture during the open-air phase of construction. It’s cosmetic until it’s not. If the addition’s truss system is moving, a Cambria feature wall mounted to that framing becomes a liability.
- Electrical outlets in the addition tripping breakers when the countertop appliances run: Undersized circuits or a subpanel that predates current Miami-Dade load calculations. Adds like a second kitchen in an ADU frequently overload the original panel, and we correct that as part of the build.
Replacement Cost & What’s Included
Here’s what Cambria home addition and ADU work costs in Miami, with real numbers:
| Scope | Miami Price Range |
|---|---|
| Home Addition (structural, full finish) | $53,100 – $153,400 |
| ADU Construction (full build, permits included) | $106,200 – $259,600 |
| Garage Conversion | $35,400 – $94,400 |
| Cambria Countertop Installation (within addition) | $2,360 – $7,670 |
| Kitchen Remodel (existing structure) | $16,520 – $53,100 |
The range is wide because Miami has three cost drivers that most other Florida cities don’t. First, Miami-Dade wind load requirements for new framing and roof tie-downs add 10 – 18% to structural costs versus Broward or Palm Beach. Second, flood elevation certificates and fill work are common in Coconut Grove, Shenandoah, and anywhere east of US-1. Third, Cambria slab pricing varies by collection: the basic “Windsor” and “Torquay” lines land at the bottom of the range, while designs like “Brittanicca Gold” push toward the top. Every quote from us is a written line-item price before we start, and the number you approve is the number on the final invoice. No change orders unless you change the scope.
See the difference
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AfterDIY or Call Us?
You can measure, and you should. Measure your existing slab run, your cabinet depths, and your overhang dimensions before you call anyone. That helps us give you an accurate written estimate over the phone. What you should not do is attempt structural work on an addition or ADU yourself. Framing, electrical, and plumbing in Miami require permits and inspections, and I’m not going to sugarcoat it: unpermitted additions are a liability when you sell, a target for code enforcement, and a genuine safety risk in hurricane season. Even the Cambria install itself is not a DIY job. A 3 cm slab weighs about 18 pounds per square foot, and a 10-foot island top can exceed 600 pounds. We use vacuum lifters and a four-man crew. Good work doesn’t need a sales pitch, so here’s the straight version: if the structure is sound and you just want new Cambria, we can have it templated, fabricated, and installed in about three weeks. If the addition itself is failing, call (850) 801-8046 and we’ll walk it together before you spend a dime.
FAQs
A properly built addition with Cambria surfaces lasts 50-plus years for the structure and 30-plus years for the quartz. The weak points in Miami are flashing details and substrate material choices, not the Cambria itself. We correct both when we build. Call (850) 801-8046 for an exact scope assessment, and the estimate is free.
Yes, in most cases we can remove and re-install existing Cambria slabs if they were fabricated at 3 cm thickness and the cabinets underneath are being preserved. But removal carries a breakage risk of about 15 – 20%, and we’ll tell you that before you decide. We don’t charge you for a slab we break during careful removal. Call (850) 801-8046 and we’ll assess your specific layout.
A garage conversion runs 8 – 12 weeks from permit to final inspection. A full ADU runs 4 – 6 months. A whole-home addition runs 5 – 8 months. Permitting in Miami-Dade adds 3 – 6 weeks on top of construction time, and we pull every permit ourselves. Call (850) 801-8046 for a timeline specific to your property.
We work directly with Cambria’s Miami distribution network and carry the templating equipment, fabrication files, and install tooling in-house. You don’t need a separate fabricator, and you don’t need to store slabs on-site. We handle the full chain from slab selection to final polish. Call (850) 801-8046 to schedule your free estimate.
Contact Sawyer Remodel Miami
Luca Romano and the Sawyer Remodel Miami crew have been building additions and ADUs across Miami for years, from full garage conversions in Coral Gables to second-story additions in Brickell. Every project runs under The Relay Visibility Guarantee: a live arrival time, photo updates before and after, and a written price before a single tool is picked up. Your 365-Day Done Right Promise is in writing on every job. If it’s not done right, we make it right. Call (850) 801-8046 to schedule your free estimate.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Miami at Sawyer Remodel Miami, serving Miami and nearby areas.
