Interior finishes cost per unit is one of the most referenced metrics in multifamily development pro formas and one of the least consistently defined. When a developer asks for it, they may mean flooring only, or flooring and cabinets, or the full scope including countertops, accessories, mirrors, window treatments, and plumbing fixture supply. A GC pricing interior finishes may or may not include the same scope items the developer expects.
The result is a conversation that generates more confusion than clarity, particularly during underwriting when the developer is establishing a budget number that must hold through the design and construction process.
This article covers what drives interior finishes cost per unit in western US multifamily construction, what the ranges look like across finish grades, and what questions owners and GCs should ask when a bid looks significantly below market.
What the interior finishes scope includes
A complete interior finishes package for a multifamily unit covers seven CSI MasterFormat divisions:
Division 6, finish carpentry and cabinets: kitchen base and upper cabinets, bath vanity cabinets, door hardware, base and casing trim.
Division 8, mirrors and shower doors: vanity mirrors, shower enclosures, tub bypass doors.
Division 9, flooring: LVP, tile in wet areas, carpet in bedrooms if specified, transitions.
Division 10, specialties: toilet accessories, wire shelving, window treatments accessories, 4C mailboxes in common areas.
Division 11, window treatments: miniblinds or roller shades for all windows.
Division 12, countertops: kitchen and bath countertops with sink cutouts.
Division 22, plumbing fixture supply: sinks, shower pans or surrounds, faucet trim kits.
When a developer asks for interior finishes cost per unit and the number does not define which of these scopes it includes, the number is not comparable to another project’s number unless that project uses the same scope definition. Establish scope before comparing costs.
What drives cost per unit
Finish grade is the dominant cost driver. The material cost difference between a workforce housing cabinet package and a Class A package for the same unit type can be 40 to 60 percent. Quartz countertops cost more than laminate. Twenty-mil LVP with a commercial warranty costs more than 12-mil LVP. Frameless shower enclosures cost more than curtain rods. The finish grade and the specific products specified to achieve it set the floor under the unit cost.
Unit mix and size affect cost per unit significantly. A project with a high proportion of two-bedroom and three-bedroom units will have higher per-unit cost than a studio-heavy project, because the larger units have more cabinet footage, more flooring area, more countertops, more window treatments, and more accessories.
Market and geography affect material and labor costs. Interior finishes costs in Seattle are higher than in El Paso for the same scope and finish grade, reflecting labor rate differentials and logistics costs. A Denver per-unit number is not directly comparable to a Salt Lake City number without adjusting for market conditions.
Scope consolidation affects cost. A single sub covering all seven divisions under one contract reduces coordination overhead and eliminates scope gaps between divisions. Seven separate subs each have an incentive to define their scope narrowly, and the coordination cost falls on the superintendent. Consolidated scope typically produces a more competitive combined number because the sub manages sequencing and logistics more efficiently.
Product lead times affect cost. Long lead time products, custom cabinetry, natural stone countertops, specialty tile, cost more in time and carrying cost than standard production products. A project specifying custom cabinetry will have higher per-unit cost than one specifying stock cabinetry, because the lead time requires earlier procurement and longer on-site storage.
Rough ranges by finish grade in western US markets
These ranges reflect complete seven-division interior finishes scope for a typical one-bedroom unit in western US multifamily markets as of early 2026. Two-bedroom units run higher; studios run lower. These are budgeting reference ranges, not bid numbers.
Workforce and affordable housing: $8,000 to $12,000 per unit. Stock cabinets, laminate countertops, 12-mil to 20-mil LVP, miniblinds, standard accessories. Shower curtain rods rather than enclosures. Basic faucet trim kits.
Market-rate Class B: $12,000 to $18,000 per unit. Semi-custom cabinets, quartz or granite countertops, 20-mil LVP, semi-frameless shower enclosures, roller shades, upgraded accessories and hardware. More durable faucet trim kits.
Class A: $18,000 to $28,000 per unit. Custom or semi-custom cabinet packages with soft-close hardware, quartz countertops with detailed edge profiles, 20-mil to 28-mil LVP with a commercial warranty, frameless shower enclosures, motorized roller shades in primary living areas, coordinated hardware finish packages across all divisions.
Ultra-premium: $28,000 and above. Full custom cabinetry, natural stone countertops, large-format porcelain tile in wet areas, frameless glass shower enclosures, motorized shades with smart building integration, premium hardware finish packages, and designer lighting coordination.
What to do when a bid looks too low
A bid that is significantly below the ranges above warrants questions before acceptance. The most common explanations for a low interior finishes bid:
Scope exclusions not visible in the bid. The bid may not include all seven divisions. Ask for a scope clarification matrix that identifies exactly which items are included and which are excluded. Exclusions that the developer assumes are covered by the GC’s scope and exclusions that the GC assumes are covered by the interior finishes sub are how gaps appear during construction.
Product substitutions not visible in the bid. The bid may price products below the specified grade. Ask for a product list that identifies exactly what is being bid and confirm it against the specification. A 12-mil LVP bid against a 20-mil LVP specification is a real cost difference that will surface as a change order if the substitution is not caught before procurement.
Labor rates below what the market sustains. A sub who wins a bid with labor rates that do not support the work will either cut quality to maintain margins or run into financial problems mid-project. Both outcomes cost the GC more than accepting a higher bid would have.
Incomplete understanding of the scope. Occasionally a bid is low because the sub did not fully understand the scope. This is particularly common when the bid is submitted without a pre-bid walk or a pre-bid scope review meeting. The low number reflects an assumption about what is included that does not match the actual scope.
A bid that cannot be explained by one of these factors warrants additional scrutiny before the subcontract is signed.
How to use this framework
When underwriting a western US multifamily project, use the ranges above to establish a preliminary interior finishes budget by finish grade and unit mix. Define the scope the budget number reflects. When bids are received, confirm scope coverage against that definition and ask for product lists that confirm finish grade compliance. When a bid is significantly below the preliminary budget, ask the specific questions above before concluding the sub has found an efficiency the market has not.
For GCs and developers who want to discuss interior finishes budgeting for a specific project in TX, WA, OR, CO, UT, or NM, contact Innergy Interiors and we will respond within one business day.