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How Much Does it Cost to Build a Duplex House

by Helen J. Wolf
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How Much Does it Cost to Build a Duplex House? A duplex house is a multi-unit building in which each apartment has its entrance and is connected to a common area. This is one of the most common residential buildings in the United States, and a duplex house is often called a townhouse.

We all know that building a house is expensive. But what if you could make a duplex house that could be used for either a single-family home or a rental? In this article, we’ll show you how much it costs to build a duplex house and why it might be worth it.

This is a topic I’ve been asked by clients and readers multiple times since I started writing this blog. So I decided to put it into its article.

If you want to know what it costs to build a duplex house, then you’re in the right place. This article will answer the question, “How much does it cost to build a duplex house?”

In this article, we will go over the costs of a duplex house.

In addition, we will look at the benefits of building a duplex house and the pros and cons of building a duplex house.

Duplex House

Do you need to build a duplex house?

Building a duplex home isn’t easy. But it is a great way to make a serious profit and ensure that you have a long-term home.

This is especially true if you live in an area with a high demand for duplexes. You can sell them for a premium price and make a profit, which is the best way to build wealth.

If you’re considering building a duplex, you might want to get a loan. You can determine how much you need to borrow by calculating the annual property tax and subtracting it from the total cost.

This should give you an idea of how much it will cost to build a duplex. You’ll also need to figure out how much you want to spend. You can do this by calculating the cost of building a duplex minus the amount you’re willing to pay.

To start, you’ll need to pick a location. You’ll also need to decide how much space you will dedicate to each unit. If you’re building one, you can get away with smaller living areas than you would if you were making two.

What is a duplex house?

People often asked me how much it costs to build a duplex house. So I thought I’d write a post explaining what a duplex home is and how much it costs to create one.

Before we go any further, it’s important to know that there is a difference between a duplex house, a triplex house, and a quadplex house. I’ll explain those terms shortly.

The first thing to know about a duplex house is that it’s two stories high. A duplex place can have one account on each side of the home. But a triplex place is three stories tall, and a quadplex is four stories tall.

The average cost to build a duplex house is around $60,000 and includes the following charges:

Foundation – $20,000

Stucco – $5,000

Roofing – $15,000

Electrical – $10,000

Windows – $2,000

Plumbing – $5,000

Land – $10,000

If you’re wondering how tall a duplex house can be, the answer is that a triplex place can be as tall as 16 floors, and a quadplex can be as tall as 20 floors.

A duplex house is a two-family home. Each side of the duplex house has its own living space. This means that you’ll need to build two separate places.

Duplex House

Is it a good investment?

So far, we’ve spent about $10,000. But that’s not counting the land cost, permits, and other fees.

Here are the costs associated with building a duplex in 2022 to give you a better idea.

The construction cost for a duplex house is about $65,000. If you include the land cost, the total cost would be $70,000.

The average home price in the US is $254,900, so you’re looking at a return on investment of about 1,400% if you sell your house in 2022.

Costs involved in building a duplex house

The bottom line is that it depends on where you live. A duplex house might be worth every penny if you’re in a hot location. But you might want to wait in other areas to see what happens.

If you decide to invest, you may be able to recoup some or all of your costs. But it would help if you considered that building up equity will take time.

And you’ll want to ensure that your tenant doesn’t cause too much damage to the property or that the building is well-maintained.

Duplex House

Frequently Asked Questions (FAQs)

Q: How much does it cost to build a duplex house?

A: The cost can vary greatly depending on location and the builder. Generally, building in a more expensive area costs less, while it costs more to build in a less costly site.

Q: Do all of the houses built around here have two stories?

A: Yes, most of them have two stories.

Q: How do you choose where to build a house?

A: Most people don’t choose where to live when they build a home. The only way to know where to make a home is by considering zoning, land availability, traffic patterns, schools, and local amenities.

Q: If I build a duplex, will it be easier or harder to sell?

A: The duplex houses we build are not hard to sell.

Q: What are some of the expenses for building a duplex house?

A: The expenses for building a duplex house are minimal. You’ll have to pay for a permit, which can cost around $1,000-3,000. Your biggest expense would be the land.

Q: How long does it take to build a duplex house?

A: Depending on the construction you want, it can take anywhere from four weeks to four months.

Q: Did you know what a duplex was before you bought it?

A: I didn’t know what a duplex was until I started looking for a place.

Q: What did you use as a guideline when determining the price of a duplex?

A: I looked at the prices of similar properties in the area and then compared those prices with the asking price. That way, I could see how much I would need to raise my offer to get the duplex I wanted.

Myths About Duplex 

1. Building a duplex is cheap.

2. It’s expensive to build a duplex.

3. I have to hire someone else to build my duplex.


This article will give you an idea of the costs of building a duplex home in New York City.

The cost of building a duplex house varies depending on several factors, such as the size and style of the property and whether you’re buying or selling.

Two main types of homes can be converted into duplexes. A single-family residence can be split into two apartments, each with its entrance and bathroom.

Or, a two-family home can be divided into two separate residences, each with its kitchen, bathroom, living room, and bedroom.

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