Apartment Construction Costs per Unit and per Square Foot

What Drives Apartment Construction Cost?

Apartment construction cost is measured two ways: per square foot and per unit. Cost per square foot helps you compare schemes quickly, while cost per unit ties directly to rent rolls and pro formas. You need both to judge whether a project pencils.

Typical U.S. ranges for hard costs run roughly $150–$250 per square foot for garden-style apartments, $200–$350 for mid-rise, and $300–$500 or more for high-rise. On a per-unit basis, apartment construction cost per unit commonly falls between $150,000 and $400,000+, depending on market and finish level. These figures move with region, scope, and date, so treat them as starting points, not bids. For a deeper look at what each metric includes, see our multi-family estimating services.

The biggest cost drivers are building type and height, unit mix, site conditions, jurisdiction, labor market, and finish level. A wood-frame podium building costs far less per square foot than a concrete high-rise because of structure, elevator count, and life-safety systems. Site work, parking, and amenity packages can swing totals sharply. Regional variation alone can move apartment building cost per square foot by 20–40% or more. If you need a reliable number for your specific site, our construction cost estimating team can build it from your drawings.

Cost per Square Foot vs. Cost per Unit: Which Metric to Use

Cost per square foot works well for early feasibility and for comparing building types, but it misleads when gross and rentable areas are mixed. Cost per unit is better for pro formas, rent comps, and unit-mix decisions because it links directly to income. Use both, but know which area basis you are dividing by.

Gross square footage (GSF) is the entire building footprint times the number of floors, including corridors, lobbies, mechanical rooms, and walls. Rentable square footage (RSF) is the area you can lease. Gross living area (GLA) is the space inside individual units. The efficiency ratio is RSF divided by GSF and typically runs 80–88% for apartments; a lower ratio means more common area and higher cost per rentable foot.

The apartment cost per unit formula is simple: total project cost ÷ number of units. For example, a $60,000,000 project with 200 units gives $300,000 per unit. The danger is mixing bases — using GSF for cost per square foot but RSF for rent creates a false yield. If you need help setting up consistent area definitions and cost models, our feasibility study estimating and estimating for developers services can align your metrics.

Typical Apartment Construction Cost Ranges by Building Type

The table below shows typical U.S. hard-cost ranges for apartment construction cost per square foot and apartment construction cost per unit by building type. These are hard costs only; soft costs (design, permits, financing, legal) typically add 15–30% on top.

Parking structures, amenity decks, and extensive site work can add significantly to these figures. A single level of below-grade parking can add $25,000–$50,000 per space depending on depth and water table. Multifamily construction cost also varies by region and date, so use these ranges for planning only. For parking-specific numbers, see our parking structure estimating page, and for a project-specific takeoff, contact our multi-family estimating services team.

Multifamily Hard Costs vs. Soft Costs: What's Included?

Every apartment construction cost estimate splits into two buckets: hard costs and soft costs. Hard costs are the physical construction — site work, concrete foundation, wood framing or steel framing, masonry, roofing, thermal and moisture protection, mechanical electrical plumbing systems, fire sprinkler system, elevator, and interior finishes. These are the costs you can see and touch, and they are priced from a quantity takeoff of the drawings.

Soft costs cover everything required to deliver the project but not permanently attached to it: architectural and engineering design fees, permits, impact fees, legal, financing, insurance, testing and inspections, and the owner's contingency. Soft costs vary widely by jurisdiction — impact fees alone can swing from a few thousand dollars per unit to over twenty thousand in high-growth metros — and by financing structure, since construction loan interest and lender fees scale with loan size and duration.

As a rule of thumb, hard costs run 70–80% of total development cost and soft costs run 20–30%. A project with complex entitlement, long permitting timelines, or expensive debt can push soft costs toward the high end; a fast-track suburban deal with simple approvals lands near the low end. General conditions (supervision, temporary facilities, cranes, cleanup) and contractor overhead and profit are sometimes classified separately from hard costs, so confirm the convention before comparing two estimates. Our budget estimating services classify costs consistently so you can compare apples to apples.

Apartment Construction Cost Breakdown by CSI Division

A reliable apartment construction cost breakdown follows CSI MasterFormat divisions, because that is how bid packages and subcontracts are organized. For a wood-frame mid-rise, the divisions that carry the most money are: Division 03 Concrete (foundations, slab-on-grade, elevated decks), Division 05 Metals (structural steel, misc. metals), Division 06 Wood (framing, sheathing, trusses), Division 07 Thermal & Moisture Protection (roofing, waterproofing, insulation), Division 08 Openings (doors, windows, storefront), Division 09 Finishes (drywall, flooring, paint, casework), Division 21 Fire Suppression, Division 22 Plumbing, Division 23 HVAC, Division 26 Electrical, and Division 31 Earthwork.

Typical hard-cost percentage ranges for a wood-frame mid-rise look like this: concrete 8–12%, framing 10–15%, MEP (Divisions 21–23 and 26 combined) 25–35%, and finishes 15–20%. Site work and earthwork often run 5–10%, and roofing and envelope together 6–10%. These percentages shift with building type and region — a concrete high-rise pushes Division 03 much higher and framing lower, while a cold-climate project loads more into Division 07.

For early conceptual estimates, many teams use UniFormat rather than MasterFormat, grouping work by element (A Substructure, B Shell, C Interiors, D Services) so costs can be compared before drawings are detailed. Once design advances, a detailed quantity takeoff follows CSI divisions so each trade bid package lines up with a scoped division. Elemental estimates are useful for feasibility, then convert to CSI for procurement. Our elemental estimating services bridge that transition.

How to Estimate Apartment Construction Cost Step by Step

1. Define scope and building type. Confirm unit count, gross floor area, number of stories, construction type (wood-frame, steel, concrete), and site conditions. Gather the preliminary drawings, geotech report, and utility information. Building type sets the framing system and the MEP density, which drive most of the cost.

2. Perform a quantity takeoff for major assemblies. Measure foundation, framing, roofing, exterior envelope, interior partitions, MEP rough-in, and finishes. A quantity takeoff in Bluebeam, PlanSwift, or STACK gives you quantities by CSI division that line up with bid packages.

3. Apply unit costs and adjust for region and date. Use RSMeans or your historical data for labor and material unit costs, then apply a city cost index and a time adjustment. Our RSMeans estimating services handle location and date factors so the numbers reflect your market.

4. Add waste factors. Lumber and sheathing typically carry 5–10% waste; concrete 3–5%; drywall 5–10%; roofing 5–8%. Waste is applied to material quantities, not labor, and it varies with design complexity and crew skill.

5. Add general conditions, overhead & profit, contingency, and escalation. General conditions and OH&P are usually 10–20% of direct cost combined. Contingency runs 5–10% depending on design maturity. Escalation is typically 3–6% per year to the midpoint of construction.

6. Validate with benchmarks. Divide total cost by gross square footage and by unit count. If your cost per unit is far outside the range for your building type and region, revisit the takeoff before you present the number. Cost per SF = Total cost ÷ Gross floor area; Cost per unit = Total cost ÷ Number of units.

Worked Example: Estimating a 200-Unit Mid-Rise Apartment

Example only — not a real project. You are pricing a 200-unit mid-rise, 250,000 GSF, five stories of wood-frame over a concrete podium, with surface parking. Start with hard costs. Assume a hard cost of $220 per GSF.

• Hard costs: 250,000 GSF × $220 = $55,000,000.
• Soft costs at 25% of hard costs: $55,000,000 × 0.25 = $13,750,000.
• Total project cost: $55,000,000 + $13,750,000 = $68,750,000.

Now derive the two headline metrics. Apartment construction cost per unit = total cost ÷ number of units. $68,750,000 ÷ 200 = $343,750 per unit. Apartment building cost per square foot is usually quoted on rentable square feet, not gross. Assume an efficiency ratio of 85%: RSF = 250,000 × 0.85 = 212,500 RSF. Then $68,750,000 ÷ 212,500 = $323.53 per RSF.

Note that GSF and RSF give very different answers — $275 per GSF versus $323.53 per RSF here. Always state which basis you are using. This is a simplified example; a real estimate requires a detailed takeoff of every CSI division, plus site-specific soft costs and escalation. For a bid-ready number on a project like this, see our multi-family estimating services and construction cost estimating services.

Using an Apartment Building Cost Calculator

An apartment building cost calculator is a screening tool, not an estimate. Most online calculators produce a rough order-of-magnitude number — typically AACE Class 5 or Class 4, meaning accuracy in the range of -30% to +50% or wider. That is fine for a first look at a site, but it is not a number you take to a lender or a joint-venture partner.

Most calculators ask for gross square footage, number of units, building type (garden, mid-rise, high-rise), location, and finish level. Some add a parking or amenity toggle. The problem is what they leave out: site work, utility extensions, structured parking, permit and impact fees, builder's risk insurance, financing costs, and regional labor adjustments. A calculator that returns $180 per square foot for a project with a $4 million retaining wall is not wrong so much as blind.

Use a calculator to answer one question early: is this site even in the ballpark? Once the answer is yes, move to a preliminary estimating services engagement or a feasibility study estimating so the number is built from quantities and local pricing rather than a rate per foot. A professional estimate can typically refine accuracy to AACE Class 3 or Class 2, which is the level lenders and equity partners expect before they commit capital.

Key Cost Drivers in Multifamily Construction

Two buildings with the same gross square footage can differ by 30% or more in cost. The gap usually comes down to six drivers.

Unit mix. A 1,200 SF two-bedroom with two full baths costs more per unit than a 650 SF studio, but less per square foot because kitchens, baths, and mechanical runs are shared across more area. Shifting 20 units from studio to two-bedroom can move total cost by seven figures.

Building height and structural system. Wood framing is the least expensive common system for low- and mid-rise, followed by steel, then cast-in-place concrete. Above five or six stories, IBC height and area limits typically force a switch to non-combustible construction, and the structural premium can be substantial.

Site conditions. Poor soils, a high water table, or a steep slope drive deep foundations, dewatering, and retaining walls. These costs land in Divisions 31 and 02 and are easy to miss at the conceptual stage.

Parking. Surface parking is cheap per space; structured parking is not. A cast-in-place or precast parking structure can add roughly $20,000–$40,000 per space depending on region, levels, and whether it is below grade.

Amenities. Pools, fitness centers, roof decks, and co-working lounges add hard cost and ongoing operating cost. They can support higher rents, but underwrite them as a rent premium, not a cost saver.

Code requirements. Fire sprinklers, elevators, and accessibility provisions scale with height and jurisdiction. A 4-story wood building and a 4-story concrete building face different requirements under the same IBC edition. Our multi-family estimating services price all six drivers in one model so you can see which one is moving your number.

Common Mistakes in Apartment Construction Estimating

• Using gross square footage instead of rentable. Cost per square foot comparisons only work when both numbers are measured the same way. Gross area includes corridors, mechanical rooms, and structure; rentable area does not, so a gross-area rate can look 15–25% lower than the rentable-area rate on the same building. State the basis on every line of your apartment construction estimating package, and be explicit about whether your multifamily construction cost per square foot figure is gross or rentable.
• Leaving out soft costs, contingency, and escalation. Hard costs are not the project cost. Add design fees, permits, insurance, financing, and a contingency sized to design maturity, then escalate to the midpoint of construction. A bid that stops at hard costs understates the project by a wide margin, so separate multifamily hard costs vs soft costs on every summary page.
• Underestimating MEP. Mechanical, electrical, and plumbing scopes commonly run 25–35% of hard costs in multifamily work, and far more in high-rise. Risers, corridor mains, unit distribution, and parking garage ventilation are frequent omissions. Price MEP from a full takeoff, not a percentage.
• Ignoring local labor rates and productivity. The same crew builds faster or slower depending on market, union status, inspection pace, and site access. Applying a national average labor rate to a tight urban site is one of the most common estimating errors.
• Skipping waste factors and site logistics. Ordering drywall, framing lumber, and finishes at net quantities guarantees shortages. Apply realistic waste factors by trade, and price crane picks, hoisting, laydown area, and phased deliveries.
• Not updating the estimate as design progresses. An estimate is a snapshot, and its reliability depends on how much design is complete. Label each version with its AACE estimate class so the team knows what accuracy range applies. Re-price at each milestone and document what changed. If you want a neutral check on your own numbers, an estimate review and second-opinion audit will surface gaps before bids close, and a construction estimating consultant can rebuild the weak divisions.

How Apartment Construction Costs Vary by Project Type

The building type sets the structural system, parking solution, and MEP complexity, and those three items drive most of the spread in apartment construction cost. A garden-style community of three- and four-story wood-frame buildings over surface parking sits at the low end. Wood framing is cheap per square foot, there is no podium or below-grade work, and MEP runs are short and repetitive. Cost per unit is lowest here, though land use is inefficient.

Podium projects place wood-frame units over one or two levels of concrete podium, usually with the parking inside the podium. The concrete work, transfer structure, and added fire separation push cost per square foot above garden-style, but the density and urban location often justify it. Mid-rise buildings use steel or concrete frames and frequently include structured parking; elevators, longer MEP risers, and more life-safety scope raise the number again. High-rise construction is the most expensive per square foot: concrete frame, deep foundations, extensive mechanical electrical plumbing systems, multiple elevators, and full sprinkler and standpipe coverage.

Mixed-use projects add retail or office floors, which complicates the structure and separates MEP systems, and they carry different code and egress requirements. For a full breakdown of that scope, see mixed-use development estimating. Senior living and student housing also change the math: unit mixes shift toward studios and one-bedrooms, common areas and amenity space grow, and in senior living the MEP and finish specifications run higher. That scope is priced differently, as covered in senior living and assisted care estimating. When you compare cost to build an apartment complex across these types, compare like for like: same area basis, same parking ratio, same amenity package. Also confirm that any multifamily construction cost per square foot benchmark you pull from another project uses the same definition of hard costs, and that the multifamily hard costs vs soft costs split is stated, before you use it as a target. If the source estimate is early, check its AACE estimate class; a Class 5 or Class 4 number carries a much wider accuracy range than a Class 2 or Class 1 estimate, and treating them as equivalent will distort your comparison.

When to Get a Professional Apartment Construction Estimate

Bring in professional apartment construction estimating when the number has to hold up to someone outside your team: a lender, an investor, or a bid deadline. If you are applying for a construction loan, the estimate needs a clear scope basis, a full quantity takeoff, and documented assumptions. Lenders and credit committees read those documents closely, and gaps get flagged.

Design development is the natural trigger. Once you have floor plans, elevations, and a structural scheme, an estimator can price real quantities instead of allowances. If you have only a site plan and unit mix, a conceptual estimate still works, but it will carry wider ranges. When a contractor's bid comes in and the number feels wrong, a second-opinion audit is the fastest way to find out why. That is what a bid estimating service review is for: checking scope coverage, unit prices, and exclusions line by line.

If you lack in-house estimating capacity, or you have three projects starting at once, outsourcing scales faster than hiring. Scope Precision Estimate provides same-day quotes, bid-ready estimates in 48 hours, 24–48 hour turnaround on most projects, rush service when you need it, and 20% off for new clients. For multifamily work, start with multi-family estimating services, or upload your plans and get a quote the same day.