Residential home addition under construction with framed walls and roof trusses

Home Additions in Eau Claire, WI

Room additions, kitchen expansions, primary suite additions, and second-story builds. Permitted, engineered, built right.

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Additions are mostly engineering

A home addition is a small house attached to a bigger house. The actual addition work is straightforward: framing, roofing, siding, finish. The hard part is the engineering and integration. How does the new roofline tie into the existing one? What are the load paths? What's the foundation strategy? Will the existing HVAC handle the additional space, or does the system need to be upsized?

We work with structural engineers on every addition project, pull the required permits, and handle the inspections. Most additions in the Eau Claire area run three to six months from contract to completion depending on scope.

The additions we build most in the Eau Claire area: primary suite additions for homeowners who love their location but outgrew their layout, kitchen bump-outs that buy ten feet of room without relocating, sunrooms and three-season rooms that stretch Wisconsin's short summer, and second-story additions where the lot has nowhere left to grow but up. Each type has its own engineering profile, and we've built all of them.

An addition also has to match the house it joins: rooflines that meet cleanly, siding that lines up, windows that belong to the same family, and interior floors that meet without a step. That matching work is where additions succeed or fail visually, and it's a place we refuse to rush. Done right, nobody who visits can tell where the original house ends.

How It Works

How a Home Addition Goes

1

Concept & Feasibility

Initial walkthrough, discussion of what you want and what the existing home can support. Sometimes additions aren't the right answer, and we'll tell you if a remodel makes more sense.

2

Engineering & Permits

Structural engineering, architectural drawings if needed, permit applications. This phase can take 4 to 8 weeks before any ground breaks.

3

Foundation, Frame, Finish

Foundation, framing, weatherproofing, mechanical (HVAC/electrical/plumbing), drywall, finish work, and final inspection.

What Home Additions Cost in Eau Claire

$40,000 to $80,000 · Single-Room Addition

Sunroom, small bedroom, or bumpout (typically 100 to 300 sq ft). Three to four months total including permitting and construction.

$80,000 to $200,000 · Substantial Addition

Primary suite, large family room, kitchen expansion, or finished basement buildout. Typically 300 to 800 sq ft. Four to six months total.

$200,000+ · Second-Story or Multi-Room Build

Adding a second story, building a substantial new wing, or combining multiple additions. Five to eight months. Structural reinforcement and full mechanical integration are usually required.

Biggest drivers: square footage, finish level, foundation requirements, and whether existing mechanical systems need upgrading to handle the new load.

What Homeowners Say

Things turned out incredible in our kitchen, especially the custom kitchen cabinets. The crew worked so hard to help us see our vision. Super happy customers and i'd gladly hire again for any future endeavors.
★★★★★
Rick Google Review
I was debating on who I was going to use for a small remodel. Eau Claire Kitchen & Bath was transparent and super knowledgeable! Answered all the questions I had, they performed the work swiftly and my bathroom looks like a spa now. Thank you so much!
★★★★★
Stace Google Review
I thought remodeling my bathroom would be stressful and expensive but after working with the staff at Eau Claire Kitchen & Bathroom remodeling, that definitely wasn't the case! Their staff were beyond respectful, quick and efficient and made sure all of my questions were answered thoroughly and concerns were taken seriously. I will definitely be calling them back in the spring when I plan on having my Kitchen remodeled. Thank you for the wonderful experience, I wouldn't trust anyone else!!
★★★★★
Chelsea Google Review
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Where We Work

We serve homeowners across Eau Claire and the broader Chippewa Valley. If you’re nearby and we haven’t listed your town, give us a call. We likely cover it.

  • Eau Claire, WI
  • Altoona, WI
  • Chippewa Falls, WI
  • Lake Hallie, WI
  • Menomonie, WI
  • Bloomer, WI
  • Cadott, WI
  • Fall Creek, WI
FAQ

Common Questions

How much does a home addition cost in Eau Claire?
Single-room additions (sunroom, small bedroom, bumpout) typically run $40,000 to $80,000. Substantial additions like a primary suite or kitchen expansion run $80,000 to $200,000. Second-story additions and multi-room builds start at $200,000 and scale from there. Engineering, permitting, and foundation work usually account for 15 to 25% of the total.
How long does a home addition take?
Most additions in the Eau Claire area run three to six months from contract to completion. The first 4 to 8 weeks is engineering, drawings, and permitting before any ground breaks. Construction itself runs eight to twenty weeks depending on scope and weather windows.
Do I need permits and engineering for an addition?
Yes. Every meaningful addition in Eau Claire-area municipalities requires permits, and most require structural engineering. We coordinate with engineers on every project and pull the required permits as part of the scope. Both costs are spelled out in the written estimate.
Can my existing foundation support an addition?
Sometimes yes, sometimes no. A second-story addition on a 1960s home almost always requires foundation evaluation and possibly reinforcement. A single-story bumpout usually needs a new foundation tied into the existing one. We assess this during the feasibility phase before any commitment.
Can we live in the house while the addition is built?
Almost always, yes. It's one of the main advantages additions have over moving. Most of the build happens outside your existing walls: foundation, framing, roofing, and weatherproofing all complete before we open the connection between old and new. The disruptive phase is the tie-in, typically one to three weeks of dust protection, temporary walls, and trades moving through the existing space. We schedule that stretch with you in advance so it lands when it hurts least.
Will an addition raise my property taxes in Eau Claire?
Almost certainly, since the permit triggers a reassessment and finished square footage is the biggest input to assessed value. The increase varies by municipality and project scope, so we can't quote it, but your assessor's office can give you a realistic estimate from the project plans before you commit. It's worth building that number into your budget math up front; most homeowners find the monthly tax difference small next to the cost of buying a bigger house in today's market, but it shouldn't be a surprise.

Ready to Talk About Your Addition?

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