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Quikrete Home Additions & ADU: The Jacksonville Owner’s Guide
If you’re planning a home addition or ADU in Jacksonville and you want to build it with Quikrete products, we can handle the full scope: foundations, slabs, footings, stem walls, and the framing and finishes that follow. A Quikrete-based addition or ADU in Jacksonville typically runs $45,000 – $130,000 for the addition, and $90,000 – $220,000 for a full ADU, depending on size, site conditions, and finish level. Most homeowners call us because they’ve started the research, bought product or priced it at the big box, and realized the concrete work isn’t a weekend job. The slab alone has to be right the first time, because everything after it sits on top.
Curtis Lane has been running crews across the Southeast for nearly three decades, and he’ll tell you the same thing he tells every Jacksonville homeowner: most addition failures don’t start with the roof. They start in the mix, the forms, the rebar schedule, the vapor barrier, and the cure. Get those wrong and you’ll be chasing cracks through the drywall for years. Get them right and the building does what it’s supposed to do. This page walks you through what that looks like, what it costs, and when to stop watching YouTube and call a crew that does this every week.
What Most Quikrete Addition and ADU Pricing Actually Includes
Here’s the range compiled from recent Jacksonville area projects we’ve priced and built. These are installed numbers, not materials-only. Every line includes the written price before work starts, which is how Bradford Remodeling operates. No numbers that move at the door.
- Full home addition, Quikrete slab on grade: $45,000 – $130,000 depending on square footage, roof tie-in complexity, windows and doors, and HVAC extension.
- Garage conversion to living space: $30,000 – $80,000, which includes slab prep, moisture mitigation, insulation, electrical, and finish work.
- ADU construction (detached, full utility rough-in): $90,000 – $220,000. The wide range reflects whether the ADU is a basic studio or a two-bedroom with a full kitchen and bath.
- Quikrete slab only (equipment pad, shed base, porch footer): Usually quoted separately.
What drives the swing on any Jacksonville addition or ADU is the same small list every time: site access, soil condition, existing structure condition, and the finish package. A 400-square-foot addition on a flat Riverside lot with easy access costs less than the same footprint on a tight lot in Ortega with poor drainage and a roof tie-in that needs structural correction. We put every number on paper before the first form gets set, and if the soil tells us something different once we open up, you’ll hear it from us the same day.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Styles & brands we work with
Which Quikrete Products Apply to an Addition or ADU
Here’s the part most guides skip, and it’s the part that matters to your foundation. Quikrete makes a range of concrete mixes, and not all of them belong in the same job. For structural work, we specify by PSI and aggregate size, not just the bag label. The standard Quikrete Concrete Mix (1101) checks in around 4,000 PSI, which is fine for sidewalks, steps, and non-structural pads. For load-bearing slabs, footings, and stem walls under a habitable addition or ADU, we typically specify a higher-strength mix and, depending on the engineering, a larger aggregate. Quikrete 5000 gets you to 5,000 PSI, and that’s the baseline we use for anything carrying framed walls and a roof in a Florida climate.
The compatibility gotcha most Jacksonville homeowners don’t know: it’s not just the mix strength. It’s the vapor barrier, the wire or rebar schedule, and the control joint layout. Northeast Florida’s high water table and humidity mean a slab without a proper vapor barrier will wick moisture into whatever framing sits on top, and that shows up as door frames that stick, baseboards that cup, and, in time, mold inside the wall cavities. Quikrete sells the mix. It does not sell the assembly. The engineering, the forms, the reinforcement, the cure schedule, and the inspection are ours. Anybody can pour a slab. Pouring one that still reads flat and dry five years later in Jacksonville is a different trade.
Signs Your Existing Addition or ADU Foundation Is Failing
If you already have an addition or ADU, and you’re on this page because something doesn’t look right, here is what actually shows up first in Jacksonville. These are the patterns we walk into, not a generic list.
- Stair-step cracks in the exterior block or brick. This is settlement, and in Northeast Florida it usually traces back to poorly compacted fill under the slab or a footing that wasn’t poured to the engineered depth. The crack is the symptom. The soil movement is the cause.
- Interior doors that stick seasonally. The frame is moving. In Jacksonville, it’s often a moisture expansion cycle from a slab without a working vapor barrier, not a structural failure. Still worth having measured.
- Tile popping or grout cracking in a straight line. That line usually follows a control joint or a crack in the slab underneath. Tile does not flex. Somebody’s moving.
- Water staining or musty odor at the base of walls. That’s wicking. The slab is pulling groundwater up, the sill plate is getting wet, and the framing is slowly rotting from the bottom up.
- Separation between the addition and the main house at the roofline or wall joint. One of the two structures is moving independently. That’s a flashpoint for leaks and, over time, a serious structural joint failure.
None of these correct themselves. If you see one, call (904) 337-5929 and describe what you’re seeing. We’ll tell you over the phone whether it sounds urgent or worth scheduling a site visit. A live person answers, 24/7. That’s not a call center script, that’s how Bradford Remodeling runs.
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We’d never tell a homeowner they can’t mix a bag of Quikrete and pour a small pad. You can, and plenty of people do it well. Pouring a pad for a grill is one thing. Pouring a monolithic slab that has to hold an addition in Florida’s humidity, pass a county inspection, and stay flat for thirty years is not a one-weekend project by a long shot. One wrong rebar detail, one missed vapor barrier, one bad batch of concrete, and you’re tearing out framed walls to fix a footing. We’ve seen it. It costs more than the original slab did.
There’s also a real safety conversation. Concrete work involves heavy loads, form failures, and masonry saw work. A form blowout during a pour can do real damage. If you have any doubt about the scope, call (904) 337-5929 and let us put eyes on the site. We’ll tell you straight if it’s something you can handle or something you should hand to a crew. The estimate doesn’t cost you anything.
How Long the Work Takes and What Closeout Looks Like
A straightforward addition or ADU with a Quikrete slab in Jacksonville runs about 4 to 8 weeks from demolition to final inspection, depending on the size and the finish package. Slab pours need cure time before we frame on top, which adds a few days. Florida’s heat and rain can extend that timeline, especially in summer, when storms roll through most afternoons.
Closeout is when the Bradford difference shows. You get a clean site, no scrap pile, no leftover mix in the driveway. You get a documented scope with every line item matched to the original written price. And you get the signed 365-Day Done Right Promise in your hand before we leave. If any part of the work fails inside that year, we’re back to fix it. No charge, no argument, no surprise invoice. That’s the entire point of the Garrison Standard.
The Garrison Standard and Why It Matters on a Big Job
Bradford Remodeling has been part of the Garrison Partners family since 2004. Every location is independently owned and operated, but every single one is held to the same standard. Written price before work starts. No numbers that move at the door. Background-checked, uniformed technicians on every job. A live person answering the phone 24/7. Name-brand materials with specifications you can trace. It’s not a marketing line. It’s a document. When we set a scope, it’s written. When we give a price, it’s written. When we promise the work, it’s written. When we finish, the guarantee is in your hand.
We also work with a documented roster of building products beyond Quikrete. What we frame, finish, and install inside a Quikrete addition or ADU, whether it’s KraftMaid cabinets, Cambria or Silestone surfaces, Kohler fixtures, or a James Hardie exterior. The point is that no part of the assembly is chosen at random. Every product carries a name, a spec, and a manufacturer’s warranty that backs up our own.
One thing worth saying plainly: Bradford Remodeling Co Jacksonville is an independent service provider. We are not affiliated with Quikrete. We spec and install Quikrete products because they’re widely available, consistent, and the engineering documentation is solid. But the work, the warranty, and the accountability are ours.
FAQs
A properly poured, properly cured slab in Jacksonville with the right vapor barrier and the right reinforcement will last 30 to 50 years or more before any structural concern. The failures we see locally happen in the first ten years, almost always from bad subgrade prep, no moisture barrier, or a mix that wasn’t matched to the engineering. If you want an exact assessment of your existing slab, call (904) 337-5929 and schedule a site visit.
It depends on the crack pattern and how much movement is happening. Some slabs can be stabilized with proper underpinning or grout injection. Others, especially when the vapor barrier was missing and the framing is wet, need more invasive correction. We don’t know which one you have until we see it and measure it. Call (904) 337-5929 and we’ll tell you what we’re looking for.
The pour itself is usually a single day. The prep work, forms, reinforcement, and inspection can take a few days to a week before the concrete truck shows up. Once poured, we hold framing off the slab for several days minimum to let it reach the strength for loading. The full addition or ADU build runs four to eight weeks from start to final inspection.
We order per job, because the right mix for your slab depends on the engineering, the aggregate, and the required PSI. We don’t guess, and we don’t let the building supply house guess either. The materials show up matched to the plan. Every bag, every yard of concrete, every length of rebar is documented in your written scope. Call (904) 337-5929 for a free estimate and we’ll walk you through the exact material list for your addition or ADU.
If you’re planning an addition or ADU in Jacksonville and want a straight number, a written scope, and a crew that shows up, call (904) 337-5929. We’ll come out, look at the site, and give you a price in writing before anything gets demolished or poured. Scope it right the first time, and the whole job goes a lot smoother when nobody’s surprised.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
