How Much Does It Cost to Build an Apartment Building? (2026)

Once you pass four units you leave residential lending and enter commercial multifamily — bigger numbers, but also real economies of scale. In 2026, apartment buildings typically cost $150,000 to $350,000 per unit to build, before land.

A small garden-style building of 5–8 units usually lands between $900,000 and $2.8M all-in, while larger low-rise projects scale from there. Building type (garden walk-up vs. mid-rise), unit mix and location are the biggest levers.

Start My Development Plan →

$150k–$350k per unit5–40+ unit projectsRSMeans-based estimates

How Much Does It Cost to Build an Apartment Building? (2026)

2026 cost dataPer-unit + by size

What drives apartment building cost

Building type — a 2–3 story garden walk-up is far cheaper per unit than an elevator-served mid-rise with structured parking.
Unit mix — studios and 1-beds cost less per unit than 2–3 bed family units; the mix sets your average.
Parking — surface parking is cheap; podium or structured parking can add $25k–$50k+ per stall.
Location & code — labor rates, seismic/wind requirements, fire and energy codes swing the per-square-foot number widely.
Amenities — clubhouses, gyms, pools and elevators raise cost but lift rents and absorption.

Residential vs. commercial financing

Up to four units is residential; five and above is commercial multifamily, underwritten on the property's income (NOI and cap rate) rather than your personal income, usually with 25–35% equity. That shift is why many first developers stop at a fourplex and why the jump to a small apartment building is a real step up in both capital and process.

The upside is scale: fixed costs — one site, one crew mobilization, one permit process — spread across many units, so per-unit cost often falls as unit count rises.

Typical all-in apartment build cost by size (2026)

Building size	All-in build cost	Est. per unit
Small — 5–8 units (garden walk-up)	$900k – $2.8M	$150k – $350k per unit
Mid — 9–16 units	$1.6M – $5M	$150k – $320k per unit
Large — 17–40+ units	$3M – $12M+	$150k – $300k per unit

Excludes land. 2026 construction ranges for low-rise garden/walk-up; mid-rise and structured parking push higher. Start a development brief for an RSMeans-based number on your program.

Get an exact number for your project

A designer prepares your full package with an RSMeans-based cost estimate — start the short brief.

Get My Plan →

Frequently asked questions

How much does it cost to build an apartment building per unit?+

Typically $150,000–$350,000 per unit in 2026 for low-rise construction, depending on unit mix, parking type and location. Per-unit cost usually falls as the building gets larger because fixed costs spread across more units.

When does a building become commercial instead of residential?+

Five or more units is commercial multifamily, financed on the property's income rather than your personal income, usually with 25–35% equity. Up to four units stays residential.

Does the estimate include land and parking structures?+

No. The ranges are building construction only. Land, structured/podium parking, and extensive site work are separate and can change the total substantially.

How do I get an exact number for my project?+

Start a development brief with your unit count, mix and location — a designer prepares plans and an RSMeans-based cost estimate for your specific program.

Get your apartment building's exact number

Tell us your unit count, mix and location — a designer prepares your plans and an RSMeans-based cost estimate, and contacts you within 1 business day.