More space without leaving the neighborhood you love. One team designs, permits and builds your addition, priced at $155–$350 per square foot.
The Short Answer
Addition Pricing
Investment starts at$155 – $350 per sq ft
A 400 square foot addition usually runs about $62,000 to $140,000.
Additions cost more per square foot than anything else we build. You're adding a foundation, a roof and new systems, not just finishing a space that already exists.
Your choices on these items decide where your addition lands in the range:
Why Add On
Outgrowing your house doesn't mean you have to leave it. An addition gives you the space you need on the lot you already own.
Stay near the schools, neighbors and commute you already love instead of starting over somewhere else.
Skip realtor commissions, closing costs and moving bills. Your money goes into new space, not transaction fees.
A primary suite, a bigger kitchen, a home office or a place for family, designed around how you actually live.
Finished square footage that matches your home adds livability now and value when you eventually sell.
What We Build
If it's a type of addition, we build it. These are the projects West Michigan homeowners ask us about most.
A larger bedroom, a spa-style bathroom and a walk-in closet, without giving up the rest of your floor plan.
Roughly double your living space without giving up yard. We reinforce the foundation and framing to carry the new load.
A private suite or accessory dwelling unit with its own bedroom, bathroom and entrance, for family or as a rental.
Attached or detached garages for more parking, storage or a workshop, with room above for an office or ADU.
A four-season room is insulated, heated and cooled for year-round use. A three-season room gives you spring through fall.
Push a cramped kitchen out to add an island, more counter space, more storage and room for everyone to gather.
A smaller addition that extends one room a few feet, perfect for a bigger bathroom, breakfast nook or dining area.
Built-in storage by your everyday entrance keeps boots, coats and bags out of the kitchen through Michigan winters.
A dedicated, quiet office with its own door, wiring and daylight, so work stops taking over the dining table.
ADUs in Grand Rapids
Grand Rapids needs more housing. Recent estimates say the city is short more than 14,000 homes, and city leaders have been clearing the way for accessory dwelling units. In June 2026 the City Commission raised the ADU size limit to 1,000 square feet and removed the two-bedroom cap. That makes an ADU one of the most useful additions you can put on your property.
Give parents or grandparents a private home steps from family, with their own entrance, kitchen and bathroom.
Rent your ADU long-term to help pay for the project. Grand Rapids doesn't allow ADUs as short-term rentals.
Adult kids saving for a home, a caregiver or a guest suite today, and a rental unit later.
ADUs can be attached to your house, built as a detached cottage, or placed above a garage. These rules apply in the City of Grand Rapids. Nearby communities set their own, so we confirm what your lot allows before design begins.
This beautiful four-season addition in Wyoming, MI transformed an unused deck area into a valuable, year-round living space. After building the new structure from the ground up, we focused on maximizing natural light with brand-new, operational windows, plus one large picture window for an uninterrupted view of their backyard. Additionally, we constructed a new low-maintenance staircase using durable composite decking and aluminum railing. The project concluded with detailed finishes, including matching exterior siding and interior trim, ensuring their new sunroom flawlessly integrates with the existing home's aesthetic.
No Surprises
When we give you a number, it isn't a materials-only guess that grows later. Here's what's built into every addition we quote.
Change orders. If we open a wall and find water damage, old wiring, or anything else outside the original scope, that's a change order. We'll show you what we found and what it costs to fix before we touch it, so you're never surprised by an invoice.
Why TPC
The people who design your addition are the people who build it. Nothing gets lost between an architect, an engineer and a builder.
Foundations, rooflines and exteriors that tie into your house cleanly and hold up through Michigan winters.
You get a clear scope and a firm price up front. Nothing changes without your OK.
One point of contact and a visual schedule in our project software, so you know when each phase starts.
See it in action: our four-season addition in Wyoming, MI and our barndominium build in Grand Rapids.
How It Works
The ranges above get you in the ballpark. Here's how you get a price built around your actual home.
Step 01
Start with a quick call with our Project Estimator. Tell us what you want to add, and we'll both find out if we're a good fit.
Step 02
We come to your home, look at your lot and your existing structure, and listen to what you need. It's free, with no pressure to hire us.
Step 03
We build your estimate from what we saw and what we talked about. Then we handle design, drawings, engineering and permits before construction starts.
Straight Answers
Home additions with TPC Construction cost $155 to $350 per square foot. A typical 400 square foot addition runs about $62,000 to $140,000. Foundation type, roof-line tie-in, HVAC, exterior matching and new plumbing or electrical decide where you land in that range. Our pricing guide breaks down every cost driver.
For many families, adding on costs less than moving. You skip realtor commissions, closing costs and moving expenses, you keep your current mortgage, and you stay in the neighborhood and school district you already love. Your money goes into space designed around your family instead of into transaction fees.
Most home additions take 7 to 14 weeks of construction, depending on size and scope. Smaller additions like a mudroom or four-season room sit at the short end. Second-story additions and additions with a kitchen or bathroom take longer. Design, drawings and permits come before construction, and you get a detailed schedule up front.
Yes. A home addition needs a building permit, plus trade permits for any electrical, plumbing or mechanical work. TPC handles the architectural drawings, structural engineering and permits for you, and all of it is included in your price.
Yes. The City of Grand Rapids allows an accessory dwelling unit on lots with a single-family or two-family home. It can be attached to your house, a detached cottage, or an apartment above a garage. In June 2026 the city raised the size limit to 1,000 square feet and removed the two-bedroom cap. ADUs can be rented long-term but not as short-term rentals. Rules differ in surrounding communities, so we confirm what your lot allows before design begins.
Yes. We match rooflines, siding, brick or stone, trim, windows and interior finishes so your addition looks like it was always part of the house. We plan the tie-in with your existing home before construction starts.
Yes. Most families stay in their home during an addition. Much of the work happens outside your existing walls, and we plan the tie-in to keep disruption short. We keep the job site clean and protected every day.
Yes. Financing is available through HFS Financial, so you can plan around a monthly payment instead of a lump sum. Ask about it at your free in-home estimate or visit our financing page.
Paying For It
Almost nobody writes one check for an addition. Financing is available through HFS Financial, so you can plan around a monthly number instead of a lump sum. If you build an ADU, rental income can help cover the payment.
Where We Build
We're based in Wyoming, MI and build home additions throughout West Michigan, including:
Book a free in-home estimate and we'll turn these ranges into a real price for your project. No charge, no pressure.
Quick Links
contact Info
4111 Stafford Ave SW,
Wyoming, MI 49548
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