Last updated: August 28, 2026 · 9-minute read
Pricing custom stone work is one of the most opaque parts of the interior design business. Stock product markups follow predictable formulas; custom work doesn't. The result: designers either underprice (and erode their own margin) or overprice and lose the project to a competitor. This guide is built for designers and architects working with hand-carved natural stone, with realistic margin frameworks drawn from BASINCRAFT's trade partner data across 84 active US designer accounts.
The three pricing models designers use
Model 1: Cost-plus markup (the most common)
You buy stone at trade pricing (15–25 percent off retail through our Trade Program), mark it up to retail or above, and bill the client. Typical markup: 1.6–2.2x your trade cost.
Example: A BASINCRAFT Carrara marble vessel sink retails at $880. Your trade price is $748 (15 percent off). You bill the client at $1,420 (1.9x trade cost). Margin: $672.
Pros: Simple to calculate, transparent to the client, scales linearly. Cons: Doesn't capture the value of your design expertise, only your sourcing relationship.
Model 2: Design fee + cost passthrough
You charge a flat design fee or hourly rate for your services, and pass through stone at your trade cost (sometimes with a small handling markup of 10–15 percent for procurement logistics).
Example: You charge $4,500 for full bathroom design over 3 months. You source the same $748 Carrara vessel sink and bill the client at $823 (10 percent handling). Total revenue: $4,575.
Pros: Cleaner client relationship; client sees exactly what materials cost. Cons: Front-loaded design fees can scare price-sensitive clients; you carry more risk during design phase.
Model 3: Hybrid (most profitable for experienced designers)
Reduced design fee combined with material markup. Common structure: lower hourly rate ($150–$200 vs. typical $250–$350) plus 1.4–1.6x markup on materials.
Example: $2,800 design fee plus stone marked up at 1.5x trade cost. Same vessel sink: $1,122. Total: $3,922.
Pros: Hidden margin in materials cushions cash flow; total client cost often lower than Model 1; works well for repeat-client relationships. Cons: Requires careful bookkeeping; harder to explain to first-time clients.
Realistic margin ranges by project type
Across our 84 trade designer partners, observed total project margin (design fee + material markup combined) ranges:
- Residential powder room refresh ($5K–$15K project): 28–42 percent margin on total. Lower-end markets cluster at 28–32 percent; high-end coastal markets at 38–42 percent.
- Residential primary bathroom ($25K–$75K): 24–38 percent margin on total. Volume helps margin in this range.
- Custom hand-carved single piece (vessel sink, custom bathtub, etc.): 35–55 percent margin on the stone itself, because custom work commands premium and your design value is more explicit.
- Hospitality / commercial projects: 18–28 percent margin on stone; design fees structured separately and typically higher per-hour. Volume compresses material margin; design value rises.
How to actually price a custom vessel sink project
Walk-through example. Project: custom 18-inch oval Calacatta marble vessel sink for a Tribeca primary bath, designer-of-record bills the client through their firm.
Step 1: Establish your costs
- BASINCRAFT trade quote for custom piece: $2,400 (includes DDP, insurance, 10-week production)
- Your sample shipping (you ordered samples to show the client): $48
- Your client consultation time (3 sessions of 1.5 hours): 4.5 hours at your cost-loaded rate ($85/hour internal cost) = $383
- Project management time (specifications, vendor coordination, install supervision): 6 hours at $85/hour = $510
- Sample storage and presentation materials: $35
- Total internal cost: $3,376
Step 2: Determine your target margin
For a custom piece in Tribeca with full design service, aim for 45–55 percent margin. Use 50 percent for this example.
Step 3: Calculate client price
$3,376 internal cost ÷ (1 - 0.50 margin) = $6,752 client price for this single stone piece, including all related design and project management.
Step 4: Sanity check against retail and competitors
BASINCRAFT retail for a similar non-custom Calacatta vessel sink: roughly $2,400. Your $6,752 price reflects: the custom nature (vs. stock), your design service, your project management, your firm's overhead and profit. Sanity check: is this what a Tribeca client expects to pay for designer-managed custom stone? Generally yes.
Step 5: Present the price as a service, not a markup
How you present this matters enormously. "$6,752 for a stone sink" sounds excessive. "$6,752 for full design, sourcing, custom production management, and installation oversight for your bespoke Calacatta vessel sink, including all consultation and project management hours" sounds appropriate.
The four pricing mistakes designers make most often
Mistake one: Quoting before knowing all production costs. Custom stone production has variable costs (specific quarry block sourcing, hand-carving hours, finish complexity, shipping logistics). Always get a fixed BASINCRAFT quote before quoting your client. We quote within 24 hours for trade accounts.
Mistake two: Using residential markups on hospitality projects. Hospitality clients negotiate harder, expect volume pricing, and operate on tighter project budgets per square foot. Don't quote a hospitality project at 1.8x markup; quote at 1.3x but bill design fees more aggressively.
Mistake three: Not billing for sample iteration. If a client wants to see three rounds of samples (round one = our standard set, round two = larger pieces of the favored stone, round three = custom finish samples), each round costs you real money in shipping and time. Build sample iteration into your design phase billing.
Mistake four: Eating change-order costs. When a client changes their mind after stone has been ordered, the change order can cost real money (production has started, custom blocks are committed). Always include a clear change-order policy in your client contract. The standard we recommend: full responsibility for changes after stone production has started, with a 15–20 percent change fee if cancellation is needed.
How BASINCRAFT supports designer pricing
Three things we do specifically to make designer pricing easier:
- 24-hour trade quote turnaround. You can quote your client confidently because our pricing to you is locked in writing within a day.
- Co-branded sample kits. For active trade accounts, we ship samples with your firm's branding visible on the kit. The client sees the samples as part of your service, not a separate vendor relationship.
- Trade-only inventory views. Designers in our trade program see inventory and new arrivals 5–7 days before public release. This lets you specify pieces that haven't yet shown up on the public site, creating exclusivity in your project recommendations.
Pricing red flags from clients
Three signals to watch for when a client is evaluating your pricing:
Red flag one: Client asks for your trade discount details. This usually means they're planning to buy directly and bypass you. Politely decline; explain your firm doesn't share trade pricing because that's part of your firm's service relationship.
Red flag two: Client compares your pricing line-by-line to retail. They're treating you as a procurement service, not a design partner. Re-anchor the conversation to design value before quoting.
Red flag three: Client requests stone selection without paying any design fee. They want free curation. Set a flat "stone consultation" fee ($350–$600) for clients who want stone selection without full design service.
Becoming a BASINCRAFT trade partner
If you don't yet have a trade account, application is straightforward:
- Submit a trade application with business verification
- Approval typically takes 2–3 business days for individual designers; 4–7 days for firms
- Once approved: 15 percent off all standard inventory, dedicated trade contact, 24-hour quote turnaround, net 30 terms on orders over $5,000
For high-volume trade partners (firms doing $50K+/year in BASINCRAFT orders), additional tier benefits apply, including 20–25 percent volume discount and direct access to our co-founders for project consultation.
Frequently asked questions
What's a reasonable design fee for a single custom stone project?
For a custom vessel sink or single statement stone piece, design fees typically range $1,500–$4,500 depending on market and your firm's positioning. For projects integrating multiple stone elements, design fees can reach $8,000–$15,000 standalone.
Should I show the client my BASINCRAFT trade price?
No, almost never. Your trade price is internal cost. Your client sees the bundled service price. This is industry-standard practice and consistent with how other trade categories operate.
How do I handle taxes on stone resale?
Most US states require resale certificates for tax exemption when buying for client resale. BASINCRAFT supports resale certificate filing through our trade application. Consult your accountant on state-specific requirements.
What if my client wants to buy stone directly from BASINCRAFT?
Clients can always buy retail directly. But: if they're working with you as their designer, your contract should specify that procurement runs through your firm. Direct procurement bypassing the designer is a contract violation.
How do I price a project with mixed stock and custom pieces?
Hybrid pricing model works well: lower markup on stock pieces (1.3–1.5x), higher markup on custom pieces (1.7–2.2x), plus your design fee. Total project margin lands in the 30–40 percent range.
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