Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Blanco Home Additions & ADU: The San Antonio Owner’s Guide
Blanco home additions and ADU construction in San Antonio typically run $45,000 – $130,000 installed, depending on square footage, foundation work, and finish level. We stock the framing, tie-in hardware, and Blanco-compatible finish materials needed to match an existing Blanco kitchen or bath to the new square footage, and our crew can usually start the structural assessment within a few days of your call. Most San Antonio owners discover they need this work when a Blanco fixture or cabinet line can’t be matched to a room that wasn’t built to Blanco specs, or when the family has simply outgrown the footprint and the Blanco kitchen or bath needs to expand with it.
What you’re really dealing with is a structural and finish-matching problem, not a simple part swap. The Blanco product in your home was built to specific dimensions and trim specifications. Extending that line into new space means matching cabinet reveals, counter overhangs, and fixture rough-ins exactly. Get the rough-in wrong, and that Blanco sink or cooktop won’t seat the way it should.
We’re an independent San Antonio general contractor, not affiliated with Blanco. But we’ve matched more Blanco kitchens and baths to new construction than most crews in the area, and we know where the tolerance problems hide.
Which Blanco Models This Applies To
Blanco’s kitchen sink and faucet lines are the most common products we match during home additions in San Antonio. The silgranit composite sinks (Precis, Diamond, Performa) have specific cabinet base requirements: a Precis 30-inch undermount needs a 33-inch cabinet, not a 30-inch. Owners adding a kitchen island or extending a run often discover their existing cabinet box won’t accept the Blanco sink they already own. That’s the compatibility gotcha most contractors miss until countertop day.
For ADU builds, Blanco stainless steel sinks (Stellar, Axis, Culina) and the Culina faucet line are common choices because they hold up to San Antonio’s hard water without pitting. The faucet rough-in matters: Blanco pull-down faucets need a minimum 2.5-inch deck hole spacing, and some Blanco bar faucets won’t fit a standard 8-inch center-set prep sink. We verify every measurement before the plumber roughs in the wall.
OEM Blanco parts cost 20 – 40% more than quality aftermarket equivalents, and for drain assemblies and mounting clips, the aftermarket options from Elkay or Kraus usually perform identically. But for the silgranit sink itself, there’s no true aftermarket equivalent. The material blend is proprietary, and aftermarket “composite” sinks don’t match the color or the thermal resistance of a real Blanco. If you’re matching an existing Blanco sink, buy Blanco.
Styles & brands we work with
Signs Your Blanco Home Additions & ADU Is Failing
- Cracks radiating from the drain opening on a silgranit sink. This usually means the sink was installed without proper support under the flange, or a garbage disposal was hung without a mounting ring. Blanco silgranit handles heat well but point-loads crack it. Once a crack reaches the drain, water seeps into the cabinet and the sink is done.
- The Blanco faucet base rocks or leaks at the deck. The mounting nut loosened, or the deck plate was overtightened during original install. Blanco’s cartridge design is solid; the failure is almost always mechanical mounting, not the valve.
- The sink drops or shifts when you fill it with water. Undermount Blanco sinks rely on clips and adhesive. In San Antonio’s summer heat, cheap adhesive softens and the clips take the load alone. If the sink moves, the seal to the counter is compromised.
- Your Blanco kitchen or bath line can’t extend into the new addition. The cabinet boxes, counter depths, or finish colors don’t match what’s available now. This is a design-planning failure from the start, and it’s the most common reason San Antonio owners call us after another contractor already started framing.
- Discoloration or chalky film on a silgranit sink that won’t scrub off. Hard water mineral scale, not a Blanco defect. But acidic cleaners (CLR, vinegar) can etch the matte finish permanently. The fix is a proper reseal, not elbow grease.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For a home addition or ADU in San Antonio where we’re matching Blanco fixtures and finishes, plan on $45,000 to $130,000 all-in. Here’s how that breaks down:
- Structural framing and foundation: $18,000 – $45,000 depending on slab vs. pier-and-beam and roofline complexity
- Plumbing rough-in and Blanco fixture installation: $3,500 – $9,000 including the sink, faucet, and water line runs
- Electrical and HVAC tie-in: $4,000 – $12,000 based on panel capacity and duct extensions
- Interior finish matching (drywall, paint, trim, flooring): $10,000 – $30,000 depending on whether we’re matching existing finishes
- Cabinetry and counters to match Blanco lines: $9,000 – $35,000 using KraftMaid or Wellborn cabinetry and Cambria, Silestone, or Caesarstone surfaces
Every quote is a written, line-item price before we start. No verbal ballpark that turns into a bigger invoice. The work carries our 365-Day Done Right Promise: if it’s not right within a year of completion, we fix it at no cost to you.
DIY or Call Us?
You can safely check the obvious things: run the Blanco faucet and look for leaks at the deck plate, check under the sink for water staining, and test whether the sink shifts when you press down on the rim. If the sink is cracked or the faucet base moves, stop there. That’s not a homeowner fix.
Anything involving structural framing, plumbing rough-ins, or electrical tie-ins is a licensed-trade job in San Antonio. The reason we’re blunt about this: we’ve torn out DIY additions where the homeowner got the Blanco sink mounted fine but buried a junction box behind drywall or ran PEX through an exterior wall with no insulation. That’s a $20,000 correction on a $5,000 mistake.
Call (254) 269-5071 if you want us to look at it. The estimate is free, and you’ll know the exact price before you decide anything.
FAQs
A typical Blanco-matched addition runs 8 – 16 weeks from permit to final walkthrough, with ADUs on the longer end due to San Antonio’s separate-meter and setback requirements. Weather delays and inspection scheduling move that number more than any other factor. Call (254) 269-5071 for a schedule estimate on your specific project.
No. Silgranit is a composite material; once it cracks, the structural integrity is gone and no epoxy repair will hold under daily use. Replacement is the only reliable fix. We can usually source and install the same Blanco model in San Antonio within a week.
No. We deliver a written, line-item price before any work begins, and it does not change unless you change the scope. If we open a wall and find something unexpected, we stop, show you what we found, and put the adjustment in writing before proceeding. No surprise invoices.
Yes. We pull all required City of San Antonio building permits, coordinate inspections, and don’t cover anything until the inspector signs off. That’s standard on every project, not an add-on service. Call (254) 269-5071 and we’ll walk you through the permit timeline for your neighborhood.
Know who’s coming, know what it costs, know it’s covered. That’s the whole job before the job starts. Call (254) 269-5071 to schedule a free estimate for your Blanco home addition or ADU in San Antonio. Isaac Pruett and our crew will give you a written price and a straight answer.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
