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Tremron Home Additions & ADU: The Ventura Owner’s Guide
Home additions and ADU construction in Ventura with Tremron-compatible materials typically run $45,000 to $130,000 for a full addition, with garage conversions starting around $30,000 and standalone ADUs reaching up to $220,000 depending on size and site work. We regularly work with homeowners who bought a home with an existing Tremron paver patio, walkway, or retaining wall and now need the surrounding structure expanded or rebuilt around it. The most common discovery point is when a foundation inspection reveals that existing hardscape has to be removed, salvaged, or integrated into the new footprint, and the owner wants to know whether their Tremron pavers can be reused.
Most Ventura homeowners don’t wake up planning to deal with hardscape. They plan an ADU for an aging parent or a rental unit, then realize the paver driveway, walkway, or patio that borders the new build has to come up first. The Tremron material itself is rarely the failure point. The failure is usually the base underneath it: Ventura’s clay-heavy soil expands and contracts through wet winters and dry summers, and older installations without proper compaction shift. When we open up a paver area for an addition, we almost always find the base is the issue, not the paver itself.
Which Tremron Models This Applies To
Tremron manufactures concrete pavers, retaining wall blocks, and segmental retaining wall systems in a wide range of sizes. The most common lines we encounter in Ventura backyards and driveways are the Holland Stone, Olde Towne Cobble, and the Tremron retaining wall blocks that come in multiple face styles. Each line has slightly different dimensions: Holland Stone pavers typically run 60mm or 80mm thick, while Olde Towne Cobble uses a 60mm profile with a tumbled finish. The thickness matters for your ADU or addition because vehicle-rated areas, like a new driveway approach or a paver apron around a garage conversion, need 80mm pavers over a properly compacted base, not 60mm.
Here’s the compatibility gotcha we see often in Ventura: Tremron has changed line names and color availability over the years, and a paver color that was available in 2008 under one name may now be sold under a different name or may not be produced at all. If you need to match existing Tremron pavers for a patio extension or a walkway that ties into a new ADU entry, identifying the exact color and line is essential before ordering anything. We can usually identify the line from a photo and a measurement, then confirm current availability through our supplier network. As an independent remodeling contractor, Elmstead Remodeling Ventura is not affiliated with Tremron, but we install and integrate their products regularly and know which lines are still readily available locally.
Styles & brands we work with
Signs Your Tremron Home Addition & ADU Is Failing
- Pavers sinking or pooling water near the existing foundation. This usually means the base has eroded or was never compacted properly. In Ventura’s winter rains, water works its way under the pavers, washes out the sand base, and the surface drops. A paver that sinks near a planned addition tells us the subgrade needs attention before we pour footings or set forms.
- Visible cracking in the pavers themselves along the border of the planned work. Concrete pavers can crack when the base shifts beneath them, but edge pavers often crack because they were never edge-restrained. Without a proper edge restraint, the pavers spread outward under load and the outer row fractures. This is common on older Ventura installations and has to be addressed before we build against them.
- Gaps between pavers growing wider over a season. Sand joint loss is normal over time, but widening gaps suggest lateral movement in the paver field. If you’re adding a structure next to the paver area, that movement has to be stopped first or the new construction can shift the pavers further.
- The retaining wall blocks are leaning or bulging. Tremron retaining wall blocks depend on proper drainage behind the wall and a level base. Ventura’s clay soil holds water, and without a drainage pipe and gravel backfill, hydrostatic pressure pushes the wall forward. A leaning wall near a planned ADU is a structural concern, not a cosmetic one, and should be evaluated before any construction starts nearby.
- Weeds or ants consistently coming up through the paver joints. This points to joint sand that has washed out completely, leaving open seams for vegetation and insects. It’s not dangerous on its own, but it signals the paver base is no longer sealed and will continue to degrade unless re-sanded and compacted.
Replacement Cost & What’s Included
For Ventura homeowners integrating or replacing Tremron hardscape as part of a larger project, here is what the work typically costs:
- Paver patio installation: $3,500 – $11,000, including base prep, sand, pavers, edge restraint, and compaction.
- Paver driveway installation: $7,000 – $18,000, using 80mm vehicle-rated pavers over a properly compacted base.
- Home addition (structural work around or over existing hardscape): $45,000 – $130,000, depending on square footage, foundation type, and how much existing hardscape has to be removed and rebuilt.
- ADU construction: $90,000 – $220,000 for a detached unit, including permits, site prep, utility runs, and all finish work.
- Garage conversion: $30,000 – $80,000, with the lower end for a straightforward conversion and the higher end for structural reconfiguration.
The range is driven by how much existing Tremron material can be salvaged and reinstalled versus replaced, the depth of the existing base, and whether the area will carry vehicle traffic. We give a written price before any work starts, and that number includes the pavers, base material, sand, edge restraint, labor, and the clean-up. If we find something unexpected once the old pavers come up, you’ll know before we proceed, not after an invoice arrives.
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There is a real safety line here, and I want to be honest about it. Removing and replacing a few pavers in a small walkway section is something a patient homeowner can manage. But integrating paver work into a home addition or ADU is not a weekend project. The excavation depth alone, often 8 to 12 inches for a vehicle-rated base, requires equipment and a real understanding of how the new foundation will interact with the paver surface. Get the base compaction wrong and the pavers will settle within a season or two, right next to a structure you spent six figures building.
What you can safely check yourself: whether the surface is pooling water after rain, whether gaps between pavers are widening, and whether a retaining wall is visibly leaning. Document what you see with photos, then call us at (341) 218-4316. We’ll walk the site with you, identify what’s salvageable, and put the scope in writing before the first board moves.
FAQs
Tremron concrete pavers typically carry a transferable lifetime warranty against manufacturing defects, and properly installed pavers in Ventura can easily last 30 to 50 years. The base underneath is the weak point here. Ventura’s clay soil expands with winter moisture and contracts through dry summers, and uncompacted bases fail much faster than the pavers themselves. If the base is done right the first time, the pavers will outlast most other hardscape materials.
Call (341) 218-4316 and we can assess whether your existing base is worth saving or needs to be rebuilt.
Yes, in many cases individual pavers can be lifted, the base re-leveled, and the same pavers reinstalled, especially if the color is still available and the pavers aren’t cracked. If your Tremron line has been discontinued, we’ll tell you honestly and walk you through matching options from current Tremron lines or complementary brands before you spend a dollar. The goal is always to save what’s salvageable.
For a typical patio or walkway tied into a new addition, the paver work itself is usually 2 to 5 days once the excavation and base prep begin. That timeline assumes weather cooperates, which in Ventura usually means we’re working around morning marine layer and occasional wind, not rain. The full addition or ADU timeline is separate and depends on the scope, but we sequence hardscape work so it never holds up framing or finish trades.
We keep common Tremron lines and colors available through our local supplier network and can typically get materials to your Ventura job site within a week. If your existing line has been discontinued, we’ll show you physical samples of the closest current matches before any order is placed. We also work with KraftMaid, Cambria, and Silestone for interior finish work when your ADU or addition includes a kitchen or bath.
Talk to Us About Your Project
If you have Tremron hardscape that needs to be integrated, replaced, or matched as part of a home addition or ADU in Ventura, call (341) 218-4316. We’ll schedule a walkthrough, assess what’s salvageable, and hand you a written price before any work begins. We answer the phone with a live person, and we’ll show up with drop cloths, shoe covers, and a plan that respects your family’s daily life while the work is underway.
Written by Graham Stein, Owner, Elmstead Remodeling Ventura at Elmstead Remodeling Ventura, serving Ventura and nearby areas.
