Imported quartz slabs got a 25% to 50% safeguard duty starting August 15

You picked a quartz color in the spring, your fabricator finally confirmed measurements, and the number on the new quote does not match the old one. That is not a mistake, and it is not your supplier being difficult.

A presidential proclamation signed July 31, 2026 created a four year safeguard tariff rate quota on imported quartz surface products. It took effect at 12:01 a.m. Eastern time on August 15, 2026 for goods entered, or withdrawn from warehouse, on or after that moment.

If you are remodeling a kitchen in Carmel-by-the-Sea, a primary bath in Pebble Beach, or a whole house in Palo Alto, this changes one specific thing: the cost of imported engineered quartz. It leaves granite, marble, quartzite and porcelain alone. Below is what the measure actually says, which materials sit outside it, and the questions worth asking before you approve a quartz quote.

What the August 15 quartz safeguard duty actually does

This came out of a Section 201 safeguard case filed last fall that split the U.S. stone industry. The outcome is a quota, not a flat tax, so the rate depends on how much has already come in.

Here is the structure, as reported by Stone World and in a trade compliance briefing from Ginger Control:

• Within-quota entries face an additional duty starting at 25%
• Over-quota entries face 50%, with modest annual reductions over the four years
• Covered goods are classified in HTS 6810.99.0020, 6810.99.0040, and 7020.00.6000
• The duties are administered through new Chapter 99 subheadings 9903.45.30 and 9903.45.31
• Reporting describes roughly 140 million square feet in year one entering at the 25% rate, administered quarterly
• Products of specified FTA partners and listed developing/CBERA countries are excluded from the safeguard

Coverage is broader than slabs. It reaches countertops, vanity tops, backsplashes, flooring, wall facing and tiles, fabricated or unfabricated. A finished quartz vanity top coming in by sea is in scope the same way a raw slab is.

For Northern California that matters because so much imported material arrives through the Port of Oakland before it ever reaches a Monterey Peninsula or South Bay job site. The duty is assessed at entry, which is why timing and quarterly quota status drive the number more than anything a showroom controls.

Quartz is covered. Quartzite, granite, marble and porcelain are not.

This is the part that confuses people fastest, because “quartz” and “quartzite” sound like the same thing and are not. Engineered quartz is a manufactured slab of crushed quartz and resin. Quartzite is a natural stone cut out of the ground.

They sit under different tariff classifications. The August 15 safeguard applies to the quartz surface product headings listed above, not to natural stone or to porcelain.

So if your designer spec’d an imported engineered quartz for a Santa Clara County remodel, your exposure is real. If the spec is Taj Mahal quartzite, Calacatta marble, a leathered granite or a large format porcelain slab, this particular measure does not touch it.

That does not make natural stone automatically cheaper. Natural slabs vary block to block, and two slabs wearing the same name can price very differently, which is worth understanding before you assume a swap saves money. There is a longer breakdown in quartzite countertop pricing and why two slabs with the same name cost different amounts, and a plain explanation of what the duty does and does not reach in what changed on August 15 and what it leaves alone.

Worth noting for California specifically: engineered quartz already carries separate fabrication and silica dust rules that affect who can legally cut it here. Those rules are unrelated to the tariff, but they land on the same material, and California’s engineered stone ruling is worth reading alongside this if quartz is still on your list.

Which materials the safeguard covers

A quick reference for reading your own spec sheet. Classification language below follows the proclamation and the trade briefing, not a simplified summary.

The quartz safeguard at a glance

Five facts that decide whether this changes your remodel budget or not.

Why your quartz quote can move between today and your install date

Before August 15, a quartz quote mostly reflected the material and the freight. Now it also reflects when a container cleared customs and where the quarterly quota stood at that moment.

That creates two separate prices for what looks like the same slab:

• Material already landed in a California warehouse before the effective date, priced the way it was always priced
• Material entering after August 15, carrying the added duty at either the in-quota or over-quota rate

So a supplier can honestly tell you one number today and a different number for the next container of the same color. Quote expiration dates stopped being paperwork and started being a real variable.

This is also why the question callers ask most often now carries more weight than it used to: is it in stock right now, in this size and finish? One homeowner recently spent weeks trying to track down a single slab of a discontinued engineered quartz to match an existing kitchen, and discontinued inventory is exactly the kind of thing a tariff environment makes harder to replace.

If your job is six to eight weeks out, the gap between in-stock and special order is now a budget decision, not just a schedule one. In-stock slabs versus special order timing walks through how that plays out on a Monterey Peninsula remodel timeline.

What to ask before you sign off on an imported quartz slab

None of this means abandoning quartz. It means asking a few more questions than you would have in June.

Worth asking directly:

• Is this specific material already in inventory, or is it on an incoming container?
• What date does this quote expire?
• Is the country of origin one of the excluded FTA partner or listed developing/CBERA countries?
• Can the material be held while my fabricator confirms measurements?
• If this color becomes hard to reorder, what is the closest in-stock equivalent in the same finish?

That last one matters more than people expect. Quartz gets specified by brand and color, and a brand-specific spec can stall a project if the line is tied up in quota timing.

Holds are the practical tool here. Many slab suppliers, including the Sand City and Carmel Rancho locations on the Central Coast, will hold material for a defined window, commonly in the range of five to seven days, which is usually enough time for a fabricator to template and confirm. Whether you can hold a slab while your fabricator confirms measurements covers how that process normally works.

One designer review on the Monterey Peninsula put the value of this plainly: “I was never left wondering about lead times or product availability.” In a year with quarterly quotas moving underneath the price, that kind of straight answer is the whole ballgame.

Frequently Asked Questions About the 2026 Quartz Tariff