Home Additions

Most of what we build falls into five scopes. Bump-outs — adding two to twelve feet to an existing room, usually a kitchen, eating area, or family room, under an extended roofline. Primary-suite additions — a new bedroom, walk-in closet, and full bath added off the back or side of the house. Second-story additions — lifting the roof off a rambler or cape and building an entire new level above. Full rear additions — a larger footprint expansion that reshapes the main level, often combined with an interior remodel. Specialty additions — sunrooms, mudrooms, three-season porches, and garage additions.

What’s included in a Knutson addition

• Feasibility and zoning review — setbacks, lot coverage, FAR (floor-area ratio), and any variance or HOA approval required
• Architectural design and 3D rendering — drawings, structural plan, and a walk-through before anything is ordered
• Structural engineering — beam sizing, foundation design, load paths
• Frost-depth foundation — Minnesota code requires footings below 42 inches, which we handle on every addition
• Framing and envelope — new walls, roof integration, sheathing, window and door openings
• Roofing, siding, gutters — matched to the existing house
• Mechanicals — extended HVAC, new electrical circuits and panel upgrades if needed, plumbing for new baths or kitchens
• Interior finishes — drywall, trim, flooring, paint, cabinetry, lighting, tied cleanly into the existing house

Our home addition process

Additions have more dependencies than interior remodels, so our five-step process puts heavier weight on the first two phases.

1. Feasibility consultation — we visit the home with the plat, walk the lot, check setbacks, look at roof geometry, and tell you what an addition can realistically achieve on this property before you spend on design.
2. Design and approvals — typically six to fourteen weeks, longer if a variance or HOA review is needed. Architectural drawings, structural review, 3D rendering, and selections.
3. Fixed-price contract — every line priced and signed before ground breaks. Foundation and structural work carry realistic allowances for soil conditions when those are unknown.
4. Build — foundation, framing, envelope, mechanicals, interior finishes. Dedicated project manager, published schedule, weatherproofing plan before each winter closeout.
5. Final walkthrough and warranty — full punch walk, envelope and structural warranty, workmanship warranty on the interior.

Why Twin Cities homeowners choose Knutson for additions

Additions fail in two specific places. The first is envelope integration — where new roof meets old roof, where new siding meets old siding, where new foundation meets old foundation. Water gets into those joints when they are built wrong, and you do not find out until two Minnesota winters later. Our carpenters have been detailing these joints for decades. The second is matching — how the new space reads against the rest of the house from the street, how the new trim and flooring tie into the existing, whether the addition looks like it was designed with the house or attached to it. Our designer runs every addition through that lens.

The third thing that matters on an addition is single-source accountability. When structural, envelope, and finish work are broken up across three different companies, the homeowner ends up refereeing whose fault a leaking valley is. With Knutson, one project manager owns the envelope from frost wall to ridge. One cabinet shop builds the built-ins. One designer is responsible for how the addition looks when it is done.

Home addition cost and timeline

Addition budgets in the Twin Cities are driven by size, foundation type, and how much envelope work the project touches. As a working guide: a kitchen bump-out of 100 to 200 square feet typically runs $115,000 to $225,000 depending on finishes. A primary-suite addition of 350 to 600 square feet lands in the $225,000 to $425,000 range. A second-story addition that builds an entire new level above a rambler runs $365,000 to $725,000+, since it involves roof removal, lifting mechanicals, and often reworking the first floor. A full rear addition combined with interior remodeling — the scope that usually delivers the biggest lifestyle change — is priced per project and typically starts north of $650,000.

Design and approvals run six to fourteen weeks, longer with variances. On-site build is typically four to eight months depending on scope and season. What most often adds weeks: zoning variance applications, structural surprises when we pull the existing siding off the mating wall, roof framing that does not align with what the original drawings showed, and deep Minnesota winters that slow foundation and framing work.

Our Twin Cities service area

Knutson builds additions throughout the Twin Cities metro. City-level pages cover Minneapolis and Saint Paul. We also do the majority of our addition work in Edina, Eden Prairie, Minnetonka, Wayzata, Maple Grove, and Plymouth.

Additions behave differently by era. 1920s bungalows in south Minneapolis typically need a rear or side addition because the lot is long and narrow and the front is historically controlled. 1940s cape cods in Highland Park or Saint Anthony Park are strong second-story candidates because the original footprint is small and the roof already suggests the upper level. 1960s ramblers in Edina, Minnetonka, and Bloomington are the classic primary-suite-off-the-back projects — the footprint allows it, the roof integration is clean, and the existing lot usually has the setback room. 1990s two-stories in Eden Prairie and Maple Grove tend toward kitchen bump-outs and sunroom or screened-porch additions, because the footprint is already generous and what is missing is outdoor connection.

Ready to plan your addition?

Request a consultation and we will walk your lot, check the zoning envelope, photograph the existing roof and envelope details, and tell you what a realistic addition looks like on this house. You will leave the first meeting with a clear sense of what is possible and what it would take to build it.