Home Addition Contractor in Michigan
Whether it’s more square footage on the ground floor or an entirely new second story, #1 Construction designs and builds additions that look like they’ve always been part of your home – backed by a 1-year labor warranty.
Professional Home Addition Services in Southeast Michigan
Turn to #1 Construction as your trusted home addition contractor in Michigan. We design and build room additions, second-story expansions, sunrooms, patios, garages, and in-law suites for homeowners across Southeast Michigan. Whatever the scope, our licensed and insured team manages the project from design and permitting through final construction.
- Free Estimates
- Licensed & Insured
- 1-Year Labor Warranty
- New Customers Save 10%
Get Your Free Estimate
No obligation. 100% Free Estimate.
additions overview
Additions Designed to Look Like They Were Always There
A home addition is one of the biggest structural projects a homeowner takes on – and it only succeeds if it functions well and looks like it belongs, not like something bolted onto the side of the house. #1 Construction has spent over 20 years building additions for homeowners across Southeast Michigan, from single-room expansions to full second-story builds.
Every addition project starts with design work that accounts for your home’s existing rooflines, materials, and architectural style, so the finished addition reads as part of the original structure rather than a visible add-on. From there, we manage the structural work, permitting, and inspections required for a project of this scale – additions carry more code and permitting complexity than most other remodeling work, and that process needs to be handled correctly from the start, not discovered partway through construction.
Every addition we complete is backed by a 1-year labor warranty, with free, itemized estimates delivered within a week.
What's Included in Our Addition Services
Design & Planning
layout and architectural design that blends with your home’s existing structure
Permitting & Inspections
all required permits managed and coordinated with local building departments
Foundation & Structural Work
footings, framing, and structural elements built to code
Roofing & Exterior Matching
rooflines and exterior materials matched to your existing home
Interior Finishing
drywall, flooring, painting, and finish work to complete the new space
Electrical & Plumbing
new wiring and plumbing extended into the addition as needed
Why us
Why Choose #1 Construction for Home Additions?
Homeowners across Southeast Michigan choose #1 Construction for additions that are engineered correctly, permitted properly, and built to match the home they attach to.
20+ Years of Experience
Including the structural and permitting complexity specific to additions and second-story builds.
Family-Owned Business
One accountable team managing your project from design through construction.
Licensed & Insured
Critical coverage on a project involving new structural work.
Design Staff Available
Additions planned to blend with your home's existing architecture and rooflines.
We Handle Permits
Permitting and inspections managed as part of the project, not left for you to navigate.
Dedicated Project Manager
One point of contact through design, permitting, and construction.
1-Year Labor Warranty
Coverage on every addition we complete.
Fair Pricing
An itemized estimate before any work begins.
Our Home Addition Services
Whatever the scope, we offer the specific addition service to match.
Room Additions
A single-room addition is one of the most straightforward ways to add usable square footage without the scope of a second-story build. Whether it’s an extra bedroom, a larger family room, or a home office, we design the addition to match your home’s existing footprint and architectural details so the finished result looks original, not added on.
Sunrooms
A sunroom adds bright, functional living space without the full structural complexity of a standard room addition, often using more glass and lighter framing than a traditional addition. We build sunrooms designed to handle Michigan’s seasonal temperature swings, so the space stays usable well beyond just the warmer months.
Garages
A garage addition adds covered parking and storage space, and can be built as a standalone structure or attached directly to your existing home. We handle the foundation, framing, and finishing work needed for a garage that matches your home’s exterior and meets local code requirements.
Patios
While not an enclosed addition, a patio extends usable living space outdoors and is often built alongside a room addition or sunroom project. We design and build patios sized and positioned to complement the rest of your home’s layout and outdoor flow.
In-Law Suites & Additional Living Space
In-law suites have become an increasingly common addition request, built to support multi-generational households or provide a separate, self-contained living space within the home. These typically include a bedroom, bathroom, and sometimes a small kitchenette or living area, planned with enough separation for privacy while still connecting to the main home.
Second-Story Additions
Adding a second story is a more involved structural project than a ground-floor addition, since it typically requires reinforcing the existing foundation and framing to support the added weight. Second-story additions are the right solution when a home’s lot doesn’t have room to expand outward, or when a homeowner wants to add significant square footage without reducing yard space. These projects take longer than a single-room addition due to the structural engineering and permitting involved, and we plan the timeline accordingly from the start.
Not sure which type of addition fits your goals and lot? We’ll walk through the options during your free consultation.
Signs It's Time to Add On to Your Home
- Your household has grown and your current square footage no longer fits your family’s needs
- You need a dedicated space for a home office, gym, or hobby that doesn’t currently exist
- An aging parent or family member needs a separate living space within your home
- You’ve outgrown your current garage or storage space
- You love your location and layout but need more room rather than wanting to move
- Your lot doesn’t have room to expand outward, making a second-story addition the more practical option
Our Home Addition Process
1. Consultation
We discuss your goals, budget, and how the addition should function within your existing home and lot.
2. Design & Planning
Our design staff plans the addition's layout, rooflines, and exterior materials to blend with your existing home.
3. Detailed Estimate
An itemized estimate arrives within a week, reflecting the specific scope and structural requirements of your project.
4. Permits & Approvals
We handle permitting and any required inspections or approvals with local building departments before construction begins.
5. Construction
Foundation, framing, roofing, and finishing work proceed with regular updates, especially important given the longer timeline of addition projects compared to smaller remodels.
6. Final Walkthrough
We review the finished addition together, confirming it meets code and expectations - backed by a 1-year labor warranty.
How Much Does a Home Addition Cost in Michigan?
Home addition costs vary more than almost any other project type, since scope, structural complexity, and finish level all affect price significantly. A few factors that most affect cost:
- Type of addition – a single-room ground-floor addition typically costs less than a second-story addition, which requires more structural reinforcement
- Square footage – larger additions require more materials, labor, and time
- Foundation requirements – new foundation work adds cost compared to building on an existing structure, as with a second-story addition
- Finish level – kitchens, bathrooms, or high-end finishes within an addition add cost compared to a simpler room addition
- Permitting complexity – additions generally require more extensive permitting than smaller remodeling projects, which factors into overall project timeline and cost
Rather than publish a generic price range that may not reflect your specific project, we provide a free, itemized estimate after discussing your goals and reviewing your property – so you know the real cost before any work is scheduled.
the benefits
The Benefits of a Professional Home Addition
Done right, an addition gives you the space you actually need without the cost and upheaval of moving.
Increased Living Space
Often more practical and less disruptive than moving to a larger home.
Increased Property Value
A well-designed addition adds real, appraised square footage.
Personalized Space
An addition built around exactly how you need to use it, rather than adapting an existing room.
Accommodates Changing Needs
Growing families, aging parents, or evolving work-from-home needs.
A Seamless Result
Proper design and construction mean the addition looks original to the home, not visibly added on.
Home Addition Services Across Southeast Michigan
#1 Construction builds home additions for homeowners throughout:
- Ann Arbor
Home Additions in Ann Arbor →
- Novi
Home Additions in Novi →
- Northville
Home Additions in Northville →
- Bloomfield Hills
Home Additions in Bloomfield Hills →
- Farmington Hills
Home Additions in Farmington Hills →
Not seeing your city? Contact us to confirm coverage in your area.
Home Addition FAQs
How much does a home addition cost in Michigan?
Cost depends on the type of addition, square footage, foundation requirements, and finish level. We provide a free, itemized estimate so you know the real cost before any work begins.
How long does a home addition take?
Timelines vary significantly based on the project – a single-room addition generally takes less time than a second-story addition, which involves more structural work and a more extensive permitting process. We’ll give you a realistic timeline during your consultation.
Do I need a permit for a home addition?
Yes, home additions almost always require permits given the structural and code implications involved. We handle the full permitting process as part of the project.
Can you match the addition to my home's existing style?
Yes – matching rooflines, siding, and architectural details to your existing home is a core part of our design process, so the addition looks original rather than visibly added on.
Is a second-story addition or a ground-floor addition better for my home?
It depends on your lot size and existing foundation. A ground-floor addition is usually simpler if you have available yard space, while a second-story addition makes sense when outward expansion isn’t an option. We’ll help you weigh the trade-offs during your consultation.
Is addition work covered by a warranty?
Yes, every home addition we complete includes a 1-year labor warranty.
Ready to Add On to Your Home?
Get a free estimate for your home addition today. New customers save 10%, and every project is backed by our 1-year labor warranty.