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Quikrete Home Additions & ADU: The West Covina Owner’s Guide
For a Quikrete home addition or ADU in West Covina, we install, repair, and replace concrete foundation systems, slab connections, and structural tie-ins for $45,000 – $130,000, depending on square footage, site prep, and engineering requirements. Most homeowners discover a failing Quikrete component the hard way: a hairline crack that spreads after winter rains, a slab that has settled a half-inch out of level near the existing home, or moisture wicking up through a perimeter edge that was never properly sealed. The good news is that most Quikrete foundation and slab repairs are addressable without tearing down the addition.
We’re an independent West Covina general contractor serving homeowners in South Hills, the Ridges, and neighborhoods along Amar Road and Nogales Street. We use Quikrete-branded concrete mixes and repair compounds, but we are not affiliated with Quikrete itself.
Key Takeaways
- Installed costs for Quikrete home additions and ADUs in West Covina run $45,000 – $130,000, with concrete and foundation work typically 12% – 18% of the total.
- Most failures show up as cracks, settlement, or moisture intrusion at the slab-to-existing-foundation connection.
- The 365-Day Done Right Promise covers our workmanship for a full year after the job closes.
- Free estimates, written pricing before work starts, and background-checked crews on every job.
Which Quikrete Models This Applies To
When we talk about Quikrete in the context of a home addition or ADU, we’re not talking about one product. Quikrete makes a range of concrete mixes, mortars, and structural repair compounds. The relevant products for West Covina additions include Quikrete 5000 (a high-early-strength concrete mix rated for structural applications), Quikrete Crack-Resistant Concrete Mix, and Quikrete Concrete Bonding Adhesive. Each behaves differently under Southern California conditions: the 5000 mix reaches 5,000 PSI at 28 days, which is appropriate for load-bearing footings and retaining walls; the crack-resistant mix includes reinforcing fibers that help control shrinkage cracks as the slab cures in hot, dry weather.
Here’s the compatibility gotcha most West Covina homeowners don’t catch: if your existing foundation was poured decades ago, it may be 2,500 – 3,000 PSI concrete. Bonding a new Quikrete 5000 slab to it without proper doweling and a bonding agent creates a seam that fails along the joint, not within either pour. That’s why we always dowel rebar into the existing foundation and apply Quikrete Concrete Bonding Adhesive before any fresh pour. The aftermarket equivalents – Sika and Sakrete both make similar products – cost roughly 7 – 10% less, but we stock Quikrete because the mix consistency is predictable, and predictability matters when a wall is already up and a foundation repair can’t wait for a re-pour.
If you have an existing Quikrete product label, read the perimeter: look for the PSI rating and the date code. If your bag or batch sheet says “5000,” “Crack-Resistant,” or “High-Strength,” that tells us exactly what to match. If you can’t find the label, we can test a core sample, but that’s usually unnecessary for additions – the engineering spec on your permit documents is the real source of truth.
Styles & brands we work with
Signs Your Quikrete Home Additions & ADU Is Failing
- Hairline cracks running parallel to the existing home wall. This is usually a shrinkage crack where the new concrete separated from the old foundation – the bonding agent either failed or was never applied. In West Covina’s dry season, a fresh pour will shrink as it cures, and that pull is strongest at the connection point.
- Settling or a visible dip, especially near the original roofline downspout. If water isn’t draining away from the addition, saturated soil compacts underneath. The slab follows it down. You’ll notice the dip first in a wide, shallow sag, not a loud pop, which is why most people find this one late.
- Efflorescence or a white, chalky residue on the lower wall studs or threshold. That’s moisture moving through the concrete and into the framing. It’s not dangerous by itself, but it’s a symptom of a perimeter without proper drainage or a missing moisture barrier.
- Door or window frames rubbing against their openings. When a slab settles unevenly, the door frame is often the first piece of trim that feels it. A door that worked fine in 2022 and drags now is a settlement tell that should be checked before it gets worse.
- Visible separation at the exterior stucco base, right at the slab line. This is the same joint failure as the hairline crack, but outside where weeds and water get into the gap. In West Covina’s winter rain season, that gap opens and closes with temperature swings and makes the whole wall move.
See the difference
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AfterReplacement Cost & What’s Included
A Quikrete foundation repair or new concrete pad for a home addition in West Covina typically runs $45,000 – $130,000 for a full project, with the concrete scope – footings, slab, finish work – coming in at roughly $12,000 – $28,000 of that total depending on size and access. The biggest drivers are whether we’re working on a single-story addition with a simple perimeter footing or a two-story ADU requiring deeper footings and more rebar. West Covina’s soil also matters: properties up against the South Hills often hit hard-packed clay that requires over-excavation, while flat lots near Merced Avenue tend to be straightforward sandy loam.
Every quote we write is a line-item price, not a lump sum with a wink. You’ll see the concrete mix, rebar, doweling, bonding agent, haul-away, and finish labor broken out separately. The price on the quote is the price on the invoice. Period. And like every job Sawyer Remodel West Covina does, the work is covered by the 365-Day Done Right Promise – if it’s not done right, we make it right, in writing, for a full year after the job closes.
DIY or Call Us?
There’s a version of this job a homeowner can do: patching a small surface spall or filling a cosmetic crack with a Quikrete vinyl concrete patcher. That’s a weekend task if you’re patient with a trowel. But the moment you’re talking about a foundation connection, settlement, or load-bearing pad, DIY gets expensive fast. Patching over a settling slab hides the symptom while the soil keeps moving underneath; you’ll spend $40 on patcher now and $18,000 on a real repair in three years.
Concrete is unforgiving. It sets on its schedule, not yours, and a bad mix or poorly doweled joint doesn’t show up for months. Luca Romano’s rule applies here, and he’s said it more than once standing over a cracked walkway: “Good work shows. Bad work shows up later.” If you’re seeing signs of structural movement, call (341) 217-4204. We’ll send a background-checked crew, not a sales guy with a clipboard, and you’ll get a real diagnosis and a written quote before any tool gets picked up.
FAQs
A properly poured, properly drained concrete foundation for an addition or ADU should last 50 years or more in West Covina’s climate, but waterproofing and drainage matter more than the concrete itself. The concrete is rarely the thing that fails; it’s the joint where new meets old, or the soil underneath. If you want an exact read on your project, call (341) 217-4204 and we’ll give you a written assessment at no charge.
Yes, in most cases. Surface cracks and minor settlement can be addressed with epoxy injection, mudjacking, or polyurethane foam lifting, and we do all three. Full replacement is reserved for deep structural damage, failed rebar, or when the original pour simply wasn’t spec. A site visit will tell you which one you’re looking at – call (341) 217-4204 to lock in a free estimate.
For a standard ADU pad or addition footing, expect 3 – 5 working days for excavation, forming, rebar, and the pour, then two days of curing before any framing goes on top. Full-strength cure takes 28 days, but most work can proceed after 48 hours. We’ll give you a schedule in writing as part of the quote, and photo updates every step of the way through the project.
We keep Quikrete 5000, Crack-Resistant Concrete Mix, Concrete Bonding Adhesive, and vinyl patcher stocked on our trucks for repair calls and small pours. For full additions and ADUs, we order directly by the pallet the day before the pour, so the mix is fresh and the batch codes match your engineering spec. If you need a repair material matched to an existing Quikrete pour, call (341) 217-4204 and we’ll confirm what we can bring out same-week.
Written by Luca Romano, Owner, Sawyer Remodel West Covina at Sawyer Remodel West Covina, serving West Covina and nearby areas.
