Home Addition Construction & Design

At SEI Construction Inc., we are Central, NJ, home addition experts who value our clients' time, investment, and creative concepts.

Get a Free Home Addition Consultation & Project Quote

Home Addition with Many Windows

Build and Design Your Home

The Way You Want It

We understand that when you’ve created special memories in your home, leaving it behind and moving is difficult. But sometimes, you outgrow it and need more space. A home addition project is one of the best ways to stay in the home you love, invest in its value, and get the extra square footage you need.

Before After

SEI Construction, Inc. Home Additions

When we meet with potential clients, we take the time to review their wants, needs, expectations, and more.

Our goal as home addition experts is to provide our clients with a thorough scope of work that addresses every phase of their project’s design and build.

Working with our established local architects, trades professionals, craftsmen, and and designers, we’ll add living space to your home’s exterior that will look and function great and blend architecturally with your existing structure.

If you’re concerned you can’t add a Union County home addition because your property lacks the square footage, we can build up and add an entirely new story to your home without taking up any more space on your property.

Whatever your needs are, we have the team, experience, and expertise to give you the space you and your family crave.

Your Home Addition Process With SEI Construction, Inc.

Step 1

The process starts with a no-obligation consultation to review your frustrations, wants, needs, budget, and more.

Step 2

Suppose you decide to move forward with our home addition services. In that case, we will collaborate with your project's hired architects, designers, and more to join design/build efforts, align goals and priorities, and reduce risk.

Step 3

With all project details in hand, we prepare a proposal with a breakdown of the scope of work for your home addition's build and customization. 

Step 4

Once you approve the proposal and sign the contract, we schedule a pre-construction meeting to discuss communication cadences, job site cleaning expectations, and more.

Step 5

As construction moves forward, we will oversee the scheduling and progress of specialty trades and your project's timeline, quality of work, and budget. Rest assured that our streamlined process, team, and BuildClean Dust Control System will provide you and your family with a worry-free remodeling experience.


Step 6

A post-construction walkthrough with each professional involved in your remodel ensures that all checklist and blue tape items are complete.

Home Addition & Room Extension Services

The first step in a successful home addition project is hiring a remodeling company that will work best with your goals, timeline and has a process that aligns with your expectations. 

Our clients receive a seamless remodeling process with accountability, communication, efficient scheduling, organization, cost optimization, and the turnkey results they expect from the company they have trusted with their projects and home.

From renderings of your space that you can virtually walk through to custom woodwork that will provide your new space with a charm all its own, no detail is left unrealized.

Home Offices

Kitchen Additions

Family Rooms

Garage Conversions

In-Law Suite Additions



Home Fitness Rooms

Home Theater Rooms

Adding 2nd Level to Single Level Homes

Room Additions for Growing Families

NJ exterior restoration and home improvement

Planning Your Home Addition

Discover answers to frequently asked questions and get insight from our team of experts.

How Much Do Home Additions Cost?

The cost of your home addition will depend on the type of addition, square footage, if the space needs to be reconstructed, whether the construction company will build up or out, the materials and products used, and your location in New Jersey. We recommend that our clients visit the Cost vs. Value report by Hanley Wood to get small, mid, and major home addition costs and ROI for their area.

Check Out Our Local Remodeling Services

Bathroom Remodeling

Kitchen Remodeling

Renovation Services

Historic Restorations

Scroll to Top