Fourplex

A single building with four separate units. It's the largest size that still qualifies for residential financing rather than commercial. Popular with small investors for that reason.

Also called quadplex, quad · Properties & types · Updated September 2026

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Part 1 of 4

Why a seller cares

A fourplex is the largest building a buyer can still finance with a residential loan, which keeps the buyer pool wide. Rent rolls, leases and expense records are the listing's real photos.

Part 2 of 4

A simple example

Your fourplex grosses $4,600 a month. Buyers ask for the leases, twelve months of expenses, and whether any unit is month-to-month.

Fourplex: a simple example
What the buyer asks forWhy
The rent roll and leasesIt is what they are buying
Twelve months of expensesTo work out the net
Occupancy and lease endsTo know what changes on day one

Four units is the line between a house with rent and a commercial building. The financing keeps it on the house side.

Part 3 of 4

What people get wrong

That four units and five are a small difference. Five needs a commercial loan, and the buyers change completely.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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