Lower Winery Production Can Raise Cost Per Gallon Without Raising the Total Bill

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

A winery can spend the same amount on certain production costs while producing fewer gallons. The cost allocated to each gallon can then rise without an equivalent increase in the total bill. This is an important distinction when interpreting a winery’s margins or a proposed production cut.

A public filing makes the allocation visible

Willamette Valley Vineyards’ 2025 annual report filed with the SEC describes allocating warehouse and winery production and facility costs to inventory on a per-gallon basis before bottling. This is that Oregon company’s disclosed accounting approach, not a claim that every Napa or Sonoma winery uses an identical policy.

Its usefulness is the explicit relationship between a pool of costs and a production denominator. That relationship can influence the unit cost attached to wine even when the physical building has not changed.

Separate the cost pool from the gallons

Imagine a hypothetical $100,000 production-cost pool allocated across 50,000 gallons. The allocation is $2 per gallon. If the same pool is spread across 25,000 gallons, it becomes $4 per gallon. The per-gallon amount doubles, but the pool remains $100,000.

This does not mean every cost is fixed or that a real winery should use this simplified allocation. Some costs fall with production, some change in steps and some continue while capacity is underused. The example isolates one mechanism so the business explanation remains clear.

It also shows why a unit-cost comparison needs both numerator and denominator. A higher cost per gallon may reflect more spending, less output or both. Without separating those changes, an owner can mistake an allocation effect for an equipment-efficiency problem.

The timing of inventory sales can carry those cost differences into reported margins in a later period.

Producing more to lower unit cost can create another problem

If demand does not support the extra wine, increasing production merely to spread costs can build inventory that needs storage and a future market. A lower allocated cost per gallon does not demonstrate that the additional gallons create positive economic value.

For a hypothetical decision, additional wine may incur grape, processing, packaging and selling costs even where the building already exists. The relevant comparison is the incremental contribution from sales the business can actually achieve, along with the resources tied up while waiting for those sales.

Conversely, reducing production can be sensible even if the remaining inventory absorbs a higher share of continuing costs. The business might avoid a larger future inventory burden. The decision cannot be judged from a single unit-cost figure without the demand and cash context.

The property and the accounting result serve different purposes

A cellar with unused capacity still has a physical capability, but unused space does not automatically produce income. Its value depends on the intended operating model and the alternatives available. A generic annual capacity number should not be treated as a forecast of profitable volume.

For a winery buyer, the useful analysis connects production, sales, inventory and continuing facility costs. It explains why the reported margin changed and what the new owner’s actual cash obligations would be. That creates a stronger basis for discussing the real estate and the business together.

Our guides to winery valuation and winery facilities provide the wider context. Explore real estate and home for sale in Napa, or contact Diamond Group Estates about winery ownership.

Source reviewed October 28, 2026. Accounting facts describe the cited company. All cost examples are hypothetical and are not an accounting policy recommendation or investment-return projection.