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Home Addition Contractor in Greater Lansing, MI

You have likely spent enough time rearranging your life around a house that no longer fits it. Whether your family is growing, a parent is moving in, or you simply need more room to breathe, a custom home addition is one of the highest-value investments you can make in your property. As a trusted home remodeling contractor in Greater Lansing, Custom Built designs and builds additions that match your existing structure, your style, and your budget.

We specialize in in-law suites and ADUs for families bringing aging parents home, kitchen additions and bump-outs for homeowners who need more room to cook and gather, master suite additions for those ready to invest in a primary bedroom that actually works, and second story additions for families who want to expand up instead of out. We handle all engineering, permitting, and construction under one roof so nothing falls through the cracks between the design phase and the build.

Professional Home Additions Contractor

Custom Built is not a general contractor who adds rooms on the side. Home additions are a core part of what we do, and we have spent 20+ years building them across Ingham, Clinton, and Eaton counties. That means we understand the township-by-township zoning differences, the frost-depth requirements, and the structural realities that determine what is actually buildable on your specific lot before we ever start designing.

Every addition we build goes through the same design-build process: one team, one contract, and no gap between what gets drawn and what gets built.

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Home Addition Types We Build in Greater Lansing

We design and build custom home additions for Mid-Michigan families who need more space without the disruption of moving. Whether you're expanding a single room or adding an entire floor, our design-build team manages every phase from the first 3D rendering to the final walkthrough. 

In-Law Suites and ADUs

An in-law suite gives aging parents or extended family a comfortable, private space without sacrificing yours. We design dedicated entrances, full bathrooms, and layouts that balance independence with connection, all built to code and permitted through your local municipality. 

 Explore In-Law Suite Additions

Kitchen Additions and Bump-Outs

When your kitchen is too cramped to cook in and too small to gather around, a kitchen addition or bump-out creates the space your family actually needs. We expand your existing footprint while matching your home's structure, exterior, and interior design so the addition feels intentional, not tacked on. 

 Explore Our Kitchen Additions and Bump-Outs

Master Suite Additions

Your primary bedroom should be a retreat, not an afterthought. A master suite addition gives you the square footage, closet space, and bathroom layout you've always needed without displacing the rest of your home's flow or function. 

 Explore Our Master Suite Additions

Second Story Additions

When your lot doesn't allow for building out, building up is the answer. A second story addition dramatically increases your square footage while preserving your yard and your home's footprint, and we engineer every one to handle Michigan's frost depths and snow loads.

Explore Our Second Story Additions

Hiring the Wrong Home Addition Contractor Will Cost You

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Financial Loss

Hiring the wrong home addition contractor can lead to financial setbacks. Incompetent contractors may mismanage budgets, leading to unexpected expenses and inflated costs. Additionally, poor workmanship might necessitate costly repairs or corrections, increasing the overall financial burden on homeowners.

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Time Delays

Inefficient contractors can cause significant delays in project completion. Whether due to poor planning, lack of organization, or inadequate workforce, these delays disrupt homeowners' timelines and may result in inconvenience, especially if the project is part of a larger plan or has specific deadlines.

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Quality Compromises

Choosing the wrong contractor can compromise the quality of the home addition. Subpar materials, shortcuts in construction, or lack of attention to detail may result in a substandard outcome. Homeowners could find themselves living with a poorly executed addition that fails to meet their expectations in terms of aesthetics, functionality, and longevity.

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Our Proven Design-Build Process For Home Additions

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1. DREAM

It starts with a conversation. Your dedicated Project Development Advisor will reach out to learn about your project, understand your goals, and make sure we are the right fit before anything else happens. For home additions, that means understanding how your family lives today and how you need the space to work long term. 
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2. DESIGN

Once we move forward, our design team comes to you. We gather measurements, build out your vision in 3D renderings, and finalize every selection before a single nail is driven. For additions, this phase includes structural planning and material matching so your new space connects seamlessly to your existing home. 
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3. BUILD

With every detail confirmed and permits in hand, our production team gets to work. You have one point of contact managing the entire build so you never have to wonder what is happening or who to call. We handle every inspection and township sign-off so you never have to. 
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4. CONTINUE

Our relationship does not end at the final walkthrough. Every project comes with a Lifetime Workmanship Warranty and a team that stands behind their work for as long as you own your home. 
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Why Greater Lansing Homeowners Trust Custom Built For Their Home Additions

  • 20+ Years of Local Roots: Based in Okemos, we have spent over two decades building home additions across Ingham, Clinton, and Eaton counties. We know the frost depths, soil conditions, and township-by-township zoning differences that determine what is actually buildable on your specific lot before we ever start designing.
  • Lifetime Workmanship Guarantee: A home addition is a permanent structural commitment to your property. We stand behind our work for the life of the build. If something we built fails, we fix it, full stop.
  • We Handle All Permitting: Home additions trigger multiple permit types including structural, electrical, and mechanical depending on scope. We manage every application, schedule every inspection, and handle every township or city requirement from start to final sign-off so you never have to navigate a building department on your own.
  • Professional Design-Build Process: Structural planning, material matching, interior design, and construction all coordinated by one team under one contract. Your addition is designed and built by the same people, so what gets drawn is what gets built and your new space connects seamlessly to your existing home.
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HOME ADDITION PROJECT COSTS

Many companies in the remodeling industry tend to avoid discussing pricing because it can be complex with many factors. But it doesn't have to be that way. We understand that remodeling projects can be costly, which is why we believe in providing upfront pricing. Here are the prices you can expect for a home addition project:

Basic 3-Season Room Home Addition

$96k+

Basic 4-Season Home Addition

$150k+

4-Season Home Addition With a Kitchen or Primary Bedroom

$220k+

What You Need to Know About Building a Home Addition

Below you will find the answers to Custom Built’s most frequently asked questions. If you don't find the answer you’re looking for, check out our Learning Center.

How Much Does A Home Addition Cost at Custom Built?

What Kind of Home Additions Can I Build?

What Do You Need to Consider Before Building Your Home Addition?

What is Custom Built's Remodeling Process?

What Warranty does Custom Built Provide for a Home Addition Project?

Where can I see more Home Addition Projects that Custom Built has completed?

Download Your Home Addition Remodeling Guide

In this guide, discover inspiring design ideas and practical planning tips to help you choose the perfect home addition for your needs.

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What our clients are saying

"We are thrilled with our new addition. Custom Built did an amazing job. They were wonderful to work with and very responsive to our questions. They made amazing suggestions, and we were happy with all of the crews that came and worked on our addition. They left the site clean every day, and the work was very high quality."

Pat and Jennifer Quinn

"Custom Built managed the addition of a bedroom, the conversion of a bedroom to a second bathroom, and replacement of chimney, siding, windows, roofing with metal shingles. As a professional engineer I was impressed with quality of work and the comprehensive effort for accuracy and true angles. That was 3 years ago with a fully supported warranty that has expired without any need to repair or correct the original work."

Bruce Archer

"They built a 3 season screen room on our condo, looking out to the woods behind us. The addition is perfect and they were a joy to work with. They communicated well with us to the progress of the work and decisions that needed to be made. They were always timely and returned our calls quickly. We would highly recommend them."

Terry Palczewski

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Let's Transform Your Home Together.

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Custom Built Design & Remodeling

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