Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Oldcastle Home Additions & ADU: The Jacksonville Owner’s Guide
Bradford Remodeling Co Jacksonville installs and completes Oldcastle home additions and ADU projects, and the typical project in Jacksonville runs $45,000 to $130,000 depending on square footage, foundation work, and finish level. We price the full scope in writing before any work starts, so you know the real number before the first tool comes out. Most homeowners call us after discovering their existing addition or ADU has a structural issue, a failed tie-in to the main house, or a rotten substrate under the exterior cladding that a previous contractor left behind.
We’re an independent Jacksonville contractor, not affiliated with Oldcastle. That matters because we match Oldcastle-compatible materials to the project without anyone’s product line dictating what’s best for your structure.
Which Oldcastle Models This Applies To
Oldcastle produces a range of concrete masonry units, retaining wall systems, and precast components used in home additions and ADU construction across Florida. The specific product line matters more than a model number: Oldcastle’s Belgard hardscape division (we work with Belgard products directly), their CMU block lines for load-bearing walls, and their precast lintels and sill systems each have different load ratings, moisture behavior, and fire ratings. If your addition was built with Oldcastle block, the wall system was likely specified in 8-inch CMU for exterior load-bearing sections and 6-inch for interior partition runs.
Here’s the compatibility point most homeowners miss: Oldcastle CMU has a slightly different face-shell thickness depending on whether it was manufactured for the Florida market versus shipped from out-of-state plants. If you’re matching new block to existing Oldcastle block, measuring the actual face-shell dimension on site is the only reliable way to avoid a mismatched course. We do that before we order, not after the wall goes up.
For OEM versus aftermarket: Oldcastle structural block doesn’t have a meaningful “aftermarket” in the way a faucet cartridge does. You either get Oldcastle-spec CMU from a Florida supplier or you get another manufacturer’s block with equivalent compressive strength. We document which one goes into your project so the spec is traceable.
Styles & brands we work with
Signs Your Oldcastle Home Additions & ADU Is Failing
- Horizontal cracking at the wall-to-roof tie-in. This usually means the previous addition wasn’t properly tied to the main structure, or differential settling is pulling the seam apart. In Jacksonville’s sandy, moisture-heavy soil, this is one of the most common failure points we see in additions built before current code enforcement tightened.
- Efflorescence or white powdery staining on block walls. Water is moving through the CMU and leaving mineral deposits behind. It’s not cosmetic, it means the wall’s drainage plane or the footing’s moisture barrier isn’t doing its job.
- Spalling or crumbling block faces at the base course. In coastal-adjacent Jacksonville air, years of moisture wicking up through the footing breaks down the block face. Once the face shells start coming off, the wall’s load path is compromised.
- Doors and windows in the addition that bind or won’t latch cleanly. Frame racking from settling will show up at the operable openings first. A door that scrapes the jamb is the structural talking to you.
- Musty odor that won’t leave, especially after rain. That’s hidden moisture behind the wall finish or under the floor assembly. By the time you smell it, the substrate is already breaking down.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A full Oldcastle-based home addition in Jacksonville runs $45,000 to $130,000. At the lower end, you’re talking about a single-room bump-out with a simple roofline, basic finish, and no major foundation complications. The upper end gets you a properly tied-in addition with multiple rooms, a foundation engineered for Jacksonville soil conditions, and finishes from our documented brand roster like Cambria or Silestone counters, KraftMaid or Wellborn cabinetry, and Kohler or Moen fixtures.
An ADU project, which includes a separate living space with kitchen and bath rough-ins, typically lands between $90,000 and $220,000 in Jacksonville depending on whether you’re converting existing garage space or building new from the slab up.
Every Bradford Remodeling project includes the written price before work starts, the scope documented in the contract, and our 365-Day Done Right Promise: if the completed work fails inside one year, we come back and correct it at no charge. No asterisks, no deductibles, no “that’s not covered” phone tag.
DIY or Call Us?
A homeowner can safely do a visual check: look for the cracking patterns, the spalling, the mildew lines along the sill. Take photos, mark the date, and watch whether the crack widens over a few weeks. That tells you whether the issue is active movement or old settlement.
What you shouldn’t DIY: anything load-bearing. Cutting into a block wall, jacking a sagging beam, or trying to patch structural CMU without understanding the load path is how small problems become six-figure rebuilds. Block walls under load are not forgiving. If you’re seeing horizontal cracks, step cracks at the corners, or any separation between the addition and the main structure, that’s a call to us before you touch anything.
Call (904) 337-5929 and we’ll walk the site, take measurements, and give you a straight answer about what’s failing and what it costs to fix.
FAQs
A properly built CMU addition with correct footings, tie-ins, and moisture management should stand for 50 to 80 years in Jacksonville’s climate. The parts that fail earlier are the tie-in assemblies, flashing, and moisture barriers, not the block itself. Call (904) 337-5929 and we’ll assess what’s actually failing on your addition.
Most failures we see are repairable if caught before the foundation loses bearing or the roof framing separates from the walls. The repair path depends on where the failure is: tie-in fixes and flashing corrections are straightforward. Full wall replacement is rarer and usually driven by years of untreated water entry. We’ll tell you which one you’re looking at, in writing, before any work starts.
A room bump-out typically runs 8 to 12 weeks from permit to final walkthrough. An ADU with kitchen and bath rough-ins runs 14 to 22 weeks. Jacksonville permitting and inspections factor into that timeline, and we pull the permits and manage the inspection schedule so you’re not waiting on the city without knowing why.
We source Oldcastle-spec CMU, Belgard hardscape products, and complementary materials from Jacksonville suppliers on a per-project basis. Lead times depend on the specific product line and quantity. We’ll confirm the material availability and lock the delivery date into your written scope before work begins. Call (904) 337-5929 for a free estimate and we’ll walk you through what’s needed for your project.
Scope it right the first time, the job goes a lot smoother when nobody’s surprised. That’s how Curtis Lane runs every Bradford Remodeling Co Jacksonville job, and it’s why we put the price, the scope, and the guarantee in writing before the first tool comes out.
Call (904) 337-5929 to schedule your free estimate. We stock and install Oldcastle-compatible materials, along with KraftMaid, Cambria, and Silestone products for the finish work.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
