Cost To Build A Duplex

How Much Does It Cost To Build A Duplex [2022]

How Much Does It Cost To Build A Duplex

A duplex is one building that contains two separate living units, which can either be side-by-side or on top of each other. The residents of the duplex will typically not share any living space, and they each have their entrance.

When you decide to build a duplex, you will need to consider several factors, such as the land on which it is going to be built and whether you are going to live in one of the units or rent both out.

Cost To Build A Duplex
How Much Does It Cost To Build A Duplex

Duplexes are a popular home style that suits the needs of many different families. They can be a comfortable way for two families to live next to each other and share some resources or a home that allows for multi-generational living. Duplexes have many benefits, and they are often much more affordable than other styles of homes.

Duplexes also allow you to build a home that can produce rental income while still allowing you to live in one half and rent out the other half. Duplexes are great options for first-time builders and investors alike. With that in mind, let’s take a look at just how much it cost to build a duplex in 2019.

Many factors affect the cost of building a duplex.

  1. Size of the project – The larger the area, the more materials are needed, which will drive up your costs.
  2. Quality of materials – Using high-end materials such as granite countertops and crown moulding can easily add thousands of dollars to your total cost.
  3. Finishes – A building with a brick exterior will be more expensive than one with vinyl siding.
  4. Features – Adding features like fireplaces or in-unit laundry will increase the cost of your duplex.

The cost to build a duplex varies depending on where you live and the materials that you choose. Duplex construction prices range from $130 per square foot for low-end finishes and up to $250 per square foot for high-end finishes.

Another factor that influences the cost is labour, with bigger cities costing more due to higher labour and wage prices. The size of your duplex will surely determine your labour.

SizeAverage Costs (Labor Included)
1,000 sq.ft.$95,000 – $220,000
2,000 sq.ft.$190,000 – $440,000
3,000 sq.ft.$285,000 – $660,000
4,000 sq.ft.$380,000 – $880,000
5,000 sq.ft.$475,000 – $1,100,000


How Much Does It Cost To Rent An RV In Canada?

How Much Does It Cost To Get Married At The Courthouse

How Much Does It Cost To Repair Xbox One

The best way to find out how much it would cost to build a duplex in your area is by contacting your local builder. They will be able to give you an estimate based on your budget and needs. It’s also important not to forget about maintenance costs when calculating how

The cost to build a duplex depends on several factors, including the size and location of your property and the materials you’ll be using for construction. It also depends on whether you’re building or buying an existing duplex.

A typical new duplex in the US costs between $200,000 and $500,000 to construct from scratch

Duplex Construction Costs
National average cost$388,000
Average range$285,000-$537,000


If you’re considering constructing your duplex, make sure you familiarize yourself with local regulations. Although some areas are more lenient than others, most municipalities have zoning regulations that stipulate how many ​units​ can be built on a given property.

You can look up these requirements with your local city or county office. Keep in mind that you might need to apply for certain permits before construction can commence, which may add additional costs to your project.

Do you want to build a duplex? If so, it can be a smart move. You’ll have someone to help cover the mortgage, and you won’t have to manage a rental property. But before you dive into this project, it’s important to get an idea of the costs so you can make sure a duplex is the right choice for you. To better understand what it takes, here’s how much it costs to build a duplex.

Duplex Cost Factors

Before we go over the average cost of building a duplex, let’s take a look at the factors that can change your final price tag.

Land and Site Preparation:

Building your own house is quite an expensive project, but building a duplex is twice as expensive. The first step of construction is buying land and preparing it for the building process. You should buy land in advance to be able to prepare it on time. You need to decide where you’re going to build your duplex and find out if there are any problems with utilities or other things that can affect the construction process.

If you have already bought the land, make sure that it has all the necessary documents that allow you to start construction on it. You should also check if the land has a flat surface, so you can start construction right away.

The average cost of site preparation in the USA is $5 – $15 per square foot, depending on the region and soil conditions. Make sure that you buy enough land for your future duplex because if you want to expand your building later, it’s going to be more expensive than buying additional land from the beginning.

The cost of building a duplex can vary considerably depending on the location. The land itself will be one of the largest factors in price. In some areas, you might pay just $100,000 for a lot big enough to build two dwellings. In other places, you’ll spend more than $300,000 for the same amount of land.

Once you have a property, you need to prepare it for building. This generally includes:

  • Clearing the land
  • Grading and levelling
  • Installing utilities or connecting to existing services
  • Building Permits

Every locality has its own rules and regulations about when permits are required. These vary widely from place to place, with some requiring permits for virtually any work done on a property while others only require them for major work like new construction.


The foundation is the basis for a duplex, so it’s essential to pay attention to it and get ready to spend some money. There are many types of foundations you can use, and they will differ in cost. The price also depends on the ground conditions, size of the unit, home location, and building materials.

Duplexes are typically constructed from wood or concrete. The cost of building a duplex depends on the size, geographic location, and materials. According to the National Association of Home Builders, the average cost of building is $100 per square foot.

The most common duplex foundations are:

  • Pier-and-beam foundation — $4,000
  • Crawl space foundation — $15,000
  • Slab foundation — $10,000
  • Basement foundation — $25,000

Framing the house

Framing costs for a duplex will vary depending on the area you live in, the complexity of the project, and any upgrades you may want to add.

Framing, or rough carpentry, includes all the material and labour needed to build your two home units, including lumber and other building materials. The cost of framing materials can vary, but this is where most of your budget should go. Framing is basic carpentry work that frames the structure of the building.

In New York City, for example, duplexes are considered two-family homes, which means they have some unique requirements to meet. Local municipal codes can change frequently and can be complicated if you aren’t familiar with them.

Duplexes are multi-unit residential buildings consisting of two units side by side.

The cost to build a duplex is $100 to $155 per square foot for the building shell only or $125,000 to $200,000 for each unit. The cost to finish a duplex depends on the number of bedrooms and bathrooms in each unit. You can expect to pay from $55,000 to $75,000 per unit to finish each unit with basic finishes.

The cost to build a duplex yourself is about $50,000 to $70,000 more than hiring a general contractor.

Install windows and doors

Windows and doors are an important part of any duplex. These will be the last items to install, but they’re also one of the most expensive parts.

Dual Living Home Design- Duplex House Plan – Dual Living Home Design 196DU: Australian home design sample pack showing the floor layout and front façade (Duplex House Design)

  • ASIN ‏ : ‎ B07PTZ6RRQ
  • Publication date ‏ : ‎ March 18, 2019
  • Language ‏ : ‎ English
  • File size ‏ : ‎ 3080 KB
  • Simultaneous device usage ‏ : ‎ Unlimited
  • Text-to-Speech ‏ : ‎ Enabled
  • Screen Reader ‏ : ‎ Supported
  • Enhanced typesetting ‏ : ‎ Enabled
  • X-Ray ‏ : ‎ Not Enabled
  • Word Wise ‏ : ‎ Not Enabled
  • Print length ‏ : ‎ 8 pages
  • Lending ‏ : ‎ Enabled

Expect to pay between $6,000 and $10,000 for your windows and doors. This cost covers about 20 windows and two exterior doors for each unit.

You can choose from a large variety of materials, including aluminium, vinyl, fibreglass, or wood. If you prefer something more custom, you can also install French or sliding patio doors or bay windows.

While this cost is significant, it’s worth the investment. Not only do windows and doors make your property look better and provide aesthetic value, but they also increase the home’s energy efficiency.

Roof installation cost

The roof is a critical part of a duplex because it protects the underlying structure from weather and sun damage. Installing a new roof can be an expensive proposition, but it’s one that you won’t need to repeat in most cases.

Asphalt shingles are very popular and can be purchased for $100-$400 per 100 square feet. Asphalt shingles are installed by overlapping them, so this will not cost you as much per square foot as other types of roofing.

Asphalt shingles come in two basic versions: 3-tab and architectural. Architectural shingles cost more, but they last longer and look better than 3-tab models.

CostHelper readers report paying $1,500-$10,200 for a 1,500-square-foot asphalt roof with architectural shingles, at an average cost of $2.63-$6.82 a square foot; or about $4,200 for a 1,500-square-foot roof using standard three-tab asphalt shingles, at an average cost of $2.80-$3.70 a square foot (labour and materials).

The cost of a new roof can vary significantly depending on the type of roof you choose. The three most common types of roofs are asphalt shingles, wood shake, and clay or concrete tiles. Other options include metal roofs or rubber slate roofs.

Asphalt shingles are the most affordable option at an average cost of $5,000 to $14,000 for a 1,500-2,100 square foot roof with a pitch (or slope) between 4/12 and 8/12. Wood shake is pricier at an average cost of $7,000 to $19,000 for the same size roof. Clay and concrete tiles are even higher at an average cost of $10,000 to $20,000 for a 1,500-2,100 square foot roof.

Finishing the interior of your home

Finishing the interior of your duplex is a great way to make it feel warm and welcoming. It can also be a great way to add additional value to your home. Although you may not have the budget for completely remodelling your home, several things can be done on a tighter budget.

Start by painting the walls in neutral colours, such as beige or taupe. Include an accent wall in each room using a bolder colour like red or orange. This will give each room some character while still leaving it neutral enough that it doesn’t scare off potential buyers. You don’t want to dissuade someone from buying your house because they don’t like your paint colour choices.

Once you’ve painted the walls, finish them off with some moulding and trim work. This is an easy and inexpensive way to add some elegance and class to any room without spending much money. In addition, adding crown moulding to the room can make the ceilings appear taller than they are – a great trick for small spaces!

Whether you are building a duplex or buying an older one, the interior design and construction of your unit are just as important as the exterior.

The following are some considerations to keep in mind when finishing the interior of your duplex:

  1. Interiors should reflect the exterior style, colour, and materials.
  2. Each unit should have an individual identity, but should also be nearly identical.
  3. Floor plans should be easy to understand, efficient, and flexible for different lifestyles.
  4. Interiors should be well-detailed and durable with quality materials that are consistent in style and finish throughout the house.
  5. Kitchens and baths sell houses. These two rooms must be attractive, spacious, and modern to attract buyers.
  6. Each unit should have good light from plenty of windows on at least two sides and an open floor plan that allows for flexibility and easy movement between rooms.
  7. Interior colours should be contemporary neutrals that blend well with traditional or contemporary furniture styles or popular colours of fabrics or carpeting to attract a broader market range of potential buyers, allowing them to visualize their personal belongings in the home.

Frequently Asked Questions about Duplex Building

Building a duplex can be a terrific method to invest in real estate and diversify your portfolio for many people. However, before diving in, potential duplex investors should think about the following questions.

Which is less expensive to construct: a duplex or two homes?

A duplex is substantially less expensive to build than two separate residences because of the shared property, foundation, and roof. Building a duplex costs 37% less than building two dwellings on average. That doesn’t even include the cost of the land! You might expect to pay up to twice as much for two single-family homes if you buy two separate lots (depending on the size needed for the duplex).

How Much Money Do You Need to Build a Duplex?

Although every contractor is different, a ten per cent downpayment is very normal for fresh new construction. If a builder requests more than 25% upfront, be wary, while custom work and local norms can increase the need for extra cash upfront.

Is Building a House or a Duplex Better?

The answer to this issue is dependent on the individual’s needs and desires. Some people build duplexes to accommodate elderly relatives someday. Others decide to build a home because they want to live in a development that does not have multi-family zoning. Consider the advantages and disadvantages stated above and your long-term investing goals.

Is it Possible to Make Money Owning a Duplex?

Yes. But, as with any other real estate purchase, you’ll need to do your homework. Duplex residences can provide a lot of cash flow, but there’s more to consider than simply the two rent sources (assuming you rent out both units).

When calculating the cost of constructing a duplex, keep in mind any carrying costs and ongoing expenses to accurately evaluate the return on your investment. Mortgage payments, insurance, monthly service providers, HOA dues, vacancy/turnover costs, property taxes, and other expenses may be included.

Do Duplexes Appreciate?

Duplexes do appreciate at the same rate as single-family houses. This can be both beneficial and detrimental. On the one hand, duplexes are in lower demand than single-family homes; on the other hand, market scarcity means restricted supply, which drives up prices. These two factors usually result inconsistent but moderate rises in value over time.

On the other hand, some market analysts believe that duplexes are more recession-proof than single-family homes. The market value of duplexes is less variable than that of single-family homes, behaving more like that of bigger commercial properties. As a result, while duplex homes’ appreciation gains may be modest, the risk of value loss may be reduced.

Is Investing in a Duplex a Good Idea?

When calculating the costs of constructing a duplex, the most important consideration is whether the advantages outweigh the costs. Is it, in other words, a wise investment to develop a duplex?

Every investment should be evaluated on its own merits, but duplexes can be an excellent addition to a well-rounded portfolio. Duplexes are seen as a “two-for-one” deal by many investors. Two independent –– and potentially profitable –– houses result from a single transaction.,cost%20of%20around%20%C2%A3213%2C000.

Duplexes are a terrific way to get into the multi-family housing market without having to invest a lot of money. They can also be simple to administer, particularly if the owner lives on-site.

If you want to add a duplex to your investment portfolio but don’t want to deal with the inconvenience of construction, you can always buy an existing duplex. Although duplex inventory is limited, our team can assist you in finding the best price, whether local or out of state.

Leave a Comment

Your email address will not be published. Required fields are marked *