Fourlakes Design Build
Home additions that respect the original
The worst compliment an addition can get is “nice addition.” Ours aim for “wait, which part is new?”
Start a conversationWe design additions from the street in: matching eave lines, window proportions, and siding reveals so the new volume reads as original. Inside, the seam disappears because the trim comes out of our shop matched to your existing profiles.
Structural engineering, zoning and lakefront setbacks, and the City of Madison permit process are all handled in-house. You will see the massing in 3D from your own yard’s vantage points before anything is final.
Most of our additions solve one of three problems: a family room the house never had, a primary suite the second floor cannot hold, or a kitchen that deserves better light than the middle of the house. If a smart interior remodel can solve your problem for a third of the money, we will show you that option first — an addition should be the answer, not the reflex.
Planning numbers? Read Home addition costs in Madison: $420–$560 per square foot, explained — the same ranges we quote in person.
Straight answers on price
What this work costs in Madison
Real ranges from our last two years of projects — the same numbers we publish in the full cost guide.
| Addition type | Typical total | Typical size |
|---|---|---|
| Bump-out (kitchen or bath) | $60k–$110k | 40–80 sq ft |
| Single-room addition | $160k–$210k | 300–420 sq ft |
| Two-story addition | $280k–$420k | 500–800 sq ft |
| Primary suite over garage | $220k–$320k | 400–550 sq ft |
Updated July 2026. Your house will land somewhere specific in these ranges — we will tell you where in the first conversation. Read the full addition costs guide →
From the portfolio
Additions projects around the lakes
Why us
What working with Fourlakes is like
One team, one contract
Design, cabinetry, and construction under one roof. When something needs deciding, the decider is already on your job.
A fixed price before demo
You approve one number after design. It changes only if you change the scope, and we tell you the cost of a change before you make it.
Friday updates, every Friday
Photos, what happened this week, what happens next week, and any decisions we need from you. At 4pm, without fail.
The Second Winter Warranty
We come back after 14 months, once the house has been through a full freeze-thaw, and fix whatever moved. Nobody else in town offers this.
How it works
How a project runs
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Walk the house
We meet at your home, talk scope and budget honestly, and tell you on the spot if we are not the right fit.
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Design in the shop
Drawings, 3D previews, and materials you can hold, in the studio attached to our workshop. Ends with a fixed price.
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Build it once
A posted calendar, a dust wall, a broom-clean site every night, and cabinetry arriving from a mile away instead of a freight dock.
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Come back in winter
Final walkthrough, then the Second Winter visit 14 months later to make right anything the seasons moved.
Good to know
Additions questions, answered straight
What do additions cost per square foot?
Recent projects have run $420 to $560 per square foot depending on foundation, roofline complexity, and finishes. The case studies list real totals.
Ready when you are
Tell us what isn’t working about your home. We’ll tell you honestly what it takes to fix it.